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Posted to commits@druid.apache.org by ji...@apache.org on 2021/04/16 23:43:25 UTC

[druid-website-src] branch master updated: Docs for 0.21.0

This is an automated email from the ASF dual-hosted git repository.

jihoonson pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/druid-website-src.git


The following commit(s) were added to refs/heads/master by this push:
     new 0577de2  Docs for 0.21.0
     new a684856  Merge pull request #222 from jihoonson/0.21.0-docs
0577de2 is described below

commit 0577de2e722902ed0969a42ba43ebde891225220
Author: Jihoon Son <ji...@apache.org>
AuthorDate: Fri Apr 16 15:03:06 2021 -0700

    Docs for 0.21.0
---
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 docs/0.21.0/ApproxHisto.html                       |   8 +
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 docs/0.21.0/Booting-a-production-cluster.html      |   8 +
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 docs/0.21.0/operations/password-provider.html      | 121 +++++++++
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 .../tutorials/tutorial-kafka.html                  |  32 +--
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 docs/latest/development/extensions-core/mysql.html |   8 +-
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 docs/latest/ingestion/hadoop.html                  |  18 +-
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 docs/latest/tutorials/tutorial-transform-spec.html |   8 +-
 docs/latest/tutorials/tutorial-update-data.html    |   8 +-
 631 files changed, 10880 insertions(+), 2810 deletions(-)

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new file mode 100644
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diff --git a/docs/0.21.0/comparisons/druid-vs-elasticsearch.html b/docs/0.21.0/comparisons/druid-vs-elasticsearch.html
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@@ -0,0 +1,110 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Apache Druid vs Elasticsearch · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/comparisons/druid-vs-elasticsearch.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:ver [...]
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            var coll = document.getElementsByClassName('collapsible');
+            var checkActiveCategory = true;
+            for (var i = 0; i < coll.length; i++) {
+              var links = coll[i].nextElementSibling.getElementsByTagName('*');
+              if (checkActiveCategory){
+                for (var j = 0; j < links.length; j++) {
+                  if (links[j].classList.contains('navListItemActive')){
+                    coll[i].nextElementSibling.classList.toggle('hide');
+                    coll[i].childNodes[1].classList.toggle('rotate');
+                    checkActiveCategory = false;
+                    break;
+                  }
+                }
+              }
+
+              coll[i].addEventListener('click', function() {
+                var arrow = this.childNodes[1];
+                arrow.classList.toggle('rotate');
+                var content = this.nextElementSibling;
+                content.classList.toggle('hide');
+              });
+            }
+
+            document.addEventListener('DOMContentLoaded', function() {
+              createToggler('#navToggler', '#docsNav', 'docsSliderActive');
+              createToggler('#tocToggler', 'body', 'tocActive');
+
+              var headings = document.querySelector('.toc-headings');
+              headings && headings.addEventListener('click', function(event) {
+                var el = event.target;
+                while(el !== headings){
+                  if (el.tagName === 'A') {
+                    document.body.classList.remove('tocActive');
+                    break;
+                  } else{
+                    el = el.parentNode;
+                  }
+                }
+              }, false);
+
+              function createToggler(togglerSelector, targetSelector, className) {
+                var toggler = document.querySelector(togglerSelector);
+                var target = document.querySelector(targetSelector);
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+                }
+
+                toggler.onclick = function(event) {
+                  event.preventDefault();
+
+                  target.classList.toggle(className);
+                };
+              }
+            });
+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/comparisons/druid-vs-elasticsearch.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Apache Druid vs Elasticsearch</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>We are not experts on search systems, if anything is incorrect about our portrayal, please let us know on the mailing list or via some other means.</p>
+<p>Elasticsearch is a search system based on Apache Lucene. It provides full text search for schema-free documents
+and provides access to raw event level data. Elasticsearch is increasingly adding more support for analytics and aggregations.
+<a href="https://groups.google.com/forum/#!msg/druid-development/nlpwTHNclj8/sOuWlKOzPpYJ">Some members of the community</a> have pointed out
+the resource requirements for data ingestion and aggregation in Elasticsearch is much higher than those of Druid.</p>
+<p>Elasticsearch also does not support data summarization/roll-up at ingestion time, which can compact the data that needs to be
+stored up to 100x with real-world data sets. This leads to Elasticsearch having greater storage requirements.</p>
+<p>Druid focuses on OLAP work flows. Druid is optimized for high performance (fast aggregation and ingestion) at low cost,
+and supports a wide range of analytic operations. Druid has some basic search support for structured event data, but does not support
+full text search. Druid also does not support completely unstructured data. Measures must be defined in a Druid schema such that
+summarization/roll-up can be done.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/misc/papers-and-talks.html"><span class="arrow-prev">← </span><span>Papers</span></a><a class="docs-next button" href="/docs/0.21.0/comparisons/druid-vs-key-value.html"><span class="function-name-prevnext">Apache Druid vs. Key/Value Stores (HBase/Cassandra/OpenTSDB)</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer [...]
+                document.addEventListener('keyup', function(e) {
+                  if (e.target !== document.body) {
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+                  if (e.keyCode === 191) {
+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
+                apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
+                indexName: 'apache_druid',
+                inputSelector: '#search_input_react',
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
+              });
+            </script></body></html>
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diff --git a/docs/0.21.0/comparisons/druid-vs-hadoop.html b/docs/0.21.0/comparisons/druid-vs-hadoop.html
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+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="druid-vs-sql-on-hadoop.html">
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+<a href="druid-vs-sql-on-hadoop.html">Click here if you are not redirected.</a>
+<script>location="druid-vs-sql-on-hadoop.html"</script>
diff --git a/docs/0.21.0/comparisons/druid-vs-impala-or-shark.html b/docs/0.21.0/comparisons/druid-vs-impala-or-shark.html
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+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="druid-vs-sql-on-hadoop.html">
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diff --git a/docs/0.21.0/comparisons/druid-vs-key-value.html b/docs/0.21.0/comparisons/druid-vs-key-value.html
new file mode 100644
index 0000000..37d74b1
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+++ b/docs/0.21.0/comparisons/druid-vs-key-value.html
@@ -0,0 +1,118 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Apache Druid vs. Key/Value Stores (HBase/Cassandra/OpenTSDB) · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/comparisons/druid-vs-key-value.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en" [...]
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            var coll = document.getElementsByClassName('collapsible');
+            var checkActiveCategory = true;
+            for (var i = 0; i < coll.length; i++) {
+              var links = coll[i].nextElementSibling.getElementsByTagName('*');
+              if (checkActiveCategory){
+                for (var j = 0; j < links.length; j++) {
+                  if (links[j].classList.contains('navListItemActive')){
+                    coll[i].nextElementSibling.classList.toggle('hide');
+                    coll[i].childNodes[1].classList.toggle('rotate');
+                    checkActiveCategory = false;
+                    break;
+                  }
+                }
+              }
+
+              coll[i].addEventListener('click', function() {
+                var arrow = this.childNodes[1];
+                arrow.classList.toggle('rotate');
+                var content = this.nextElementSibling;
+                content.classList.toggle('hide');
+              });
+            }
+
+            document.addEventListener('DOMContentLoaded', function() {
+              createToggler('#navToggler', '#docsNav', 'docsSliderActive');
+              createToggler('#tocToggler', 'body', 'tocActive');
+
+              var headings = document.querySelector('.toc-headings');
+              headings && headings.addEventListener('click', function(event) {
+                var el = event.target;
+                while(el !== headings){
+                  if (el.tagName === 'A') {
+                    document.body.classList.remove('tocActive');
+                    break;
+                  } else{
+                    el = el.parentNode;
+                  }
+                }
+              }, false);
+
+              function createToggler(togglerSelector, targetSelector, className) {
+                var toggler = document.querySelector(togglerSelector);
+                var target = document.querySelector(targetSelector);
+
+                if (!toggler) {
+                  return;
+                }
+
+                toggler.onclick = function(event) {
+                  event.preventDefault();
+
+                  target.classList.toggle(className);
+                };
+              }
+            });
+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/comparisons/druid-vs-key-value.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Apache Druid vs. Key/Value Stores (HBase/Cassandra/OpenTSDB)</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>Druid is highly optimized for scans and aggregations, it supports arbitrarily deep drill downs into data sets. This same functionality
+is supported in key/value stores in 2 ways:</p>
+<ol>
+<li>Pre-compute all permutations of possible user queries</li>
+<li>Range scans on event data</li>
+</ol>
+<p>When pre-computing results, the key is the exact parameters of the query, and the value is the result of the query.
+The queries return extremely quickly, but at the cost of flexibility, as ad-hoc exploratory queries are not possible with
+pre-computing every possible query permutation. Pre-computing all permutations of all ad-hoc queries leads to result sets
+that grow exponentially with the number of columns of a data set, and pre-computing queries for complex real-world data sets
+can require hours of pre-processing time.</p>
+<p>The other approach to using key/value stores for aggregations to use the dimensions of an event as the key and the event measures as the value.
+Aggregations are done by issuing range scans on this data. Timeseries specific databases such as OpenTSDB use this approach.
+One of the limitations here is that the key/value storage model does not have indexes for any kind of filtering other than prefix ranges,
+which can be used to filter a query down to a metric and time range, but cannot resolve complex predicates to narrow the exact data to scan.
+When the number of rows to scan gets large, this limitation can greatly reduce performance. It is also harder to achieve good
+locality with key/value stores because most don’t support pushing down aggregates to the storage layer.</p>
+<p>For arbitrary exploration of data (flexible data filtering), Druid's custom column format enables ad-hoc queries without pre-computation. The format
+also enables fast scans on columns, which is important for good aggregation performance.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/comparisons/druid-vs-elasticsearch.html"><span class="arrow-prev">← </span><span>Apache Druid vs Elasticsearch</span></a><a class="docs-next button" href="/docs/0.21.0/comparisons/druid-vs-kudu.html"><span>Apache Druid vs Kudu</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="c [...]
+                document.addEventListener('keyup', function(e) {
+                  if (e.target !== document.body) {
+                    return;
+                  }
+                  // keyCode for '/' (slash)
+                  if (e.keyCode === 191) {
+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
+                apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
+                indexName: 'apache_druid',
+                inputSelector: '#search_input_react',
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
+              });
+            </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/comparisons/druid-vs-kudu.html b/docs/0.21.0/comparisons/druid-vs-kudu.html
new file mode 100644
index 0000000..7e1abf4
--- /dev/null
+++ b/docs/0.21.0/comparisons/druid-vs-kudu.html
@@ -0,0 +1,112 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Apache Druid vs Kudu · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/comparisons/druid-vs-kudu.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.2 [...]
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            var coll = document.getElementsByClassName('collapsible');
+            var checkActiveCategory = true;
+            for (var i = 0; i < coll.length; i++) {
+              var links = coll[i].nextElementSibling.getElementsByTagName('*');
+              if (checkActiveCategory){
+                for (var j = 0; j < links.length; j++) {
+                  if (links[j].classList.contains('navListItemActive')){
+                    coll[i].nextElementSibling.classList.toggle('hide');
+                    coll[i].childNodes[1].classList.toggle('rotate');
+                    checkActiveCategory = false;
+                    break;
+                  }
+                }
+              }
+
+              coll[i].addEventListener('click', function() {
+                var arrow = this.childNodes[1];
+                arrow.classList.toggle('rotate');
+                var content = this.nextElementSibling;
+                content.classList.toggle('hide');
+              });
+            }
+
+            document.addEventListener('DOMContentLoaded', function() {
+              createToggler('#navToggler', '#docsNav', 'docsSliderActive');
+              createToggler('#tocToggler', 'body', 'tocActive');
+
+              var headings = document.querySelector('.toc-headings');
+              headings && headings.addEventListener('click', function(event) {
+                var el = event.target;
+                while(el !== headings){
+                  if (el.tagName === 'A') {
+                    document.body.classList.remove('tocActive');
+                    break;
+                  } else{
+                    el = el.parentNode;
+                  }
+                }
+              }, false);
+
+              function createToggler(togglerSelector, targetSelector, className) {
+                var toggler = document.querySelector(togglerSelector);
+                var target = document.querySelector(targetSelector);
+
+                if (!toggler) {
+                  return;
+                }
+
+                toggler.onclick = function(event) {
+                  event.preventDefault();
+
+                  target.classList.toggle(className);
+                };
+              }
+            });
+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/comparisons/druid-vs-kudu.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Apache Druid vs Kudu</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>Kudu's storage format enables single row updates, whereas updates to existing Druid segments requires recreating the segment, so theoretically
+the process for updating old values should be higher latency in Druid. However, the requirements in Kudu for maintaining extra head space to store
+updates as well as organizing data by id instead of time has the potential to introduce some extra latency and accessing
+of data that is not need to answer a query at query time.</p>
+<p>Druid summarizes/rollups up data at ingestion time, which in practice reduces the raw data that needs to be
+stored significantly (up to 40 times on average), and increases performance of scanning raw data significantly.
+Druid segments also contain bitmap indexes for fast filtering, which Kudu does not currently support.
+Druid's segment architecture is heavily geared towards fast aggregates and filters, and for OLAP workflows. Appends are very
+fast in Druid, whereas updates of older data is higher latency. This is by design as the data Druid is good for is typically event data,
+and does not need to be updated too frequently. Kudu supports arbitrary primary keys with uniqueness constraints, and
+efficient lookup by ranges of those keys. Kudu chooses not to include the execution engine, but supports sufficient
+operations so as to allow node-local processing from the execution engines. This means that Kudu can support multiple frameworks on the same data (e.g., MR, Spark, and SQL).
+Druid includes its own query layer that allows it to push down aggregations and computations directly to data processes for faster query processing.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/comparisons/druid-vs-key-value.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">Apache Druid vs. Key/Value Stores (HBase/Cassandra/OpenTSDB)</span></a><a class="docs-next button" href="/docs/0.21.0/comparisons/druid-vs-redshift.html"><span>Apache Druid vs Redshift</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div [...]
+                document.addEventListener('keyup', function(e) {
+                  if (e.target !== document.body) {
+                    return;
+                  }
+                  // keyCode for '/' (slash)
+                  if (e.keyCode === 191) {
+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
+                apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
+                indexName: 'apache_druid',
+                inputSelector: '#search_input_react',
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
+              });
+            </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/comparisons/druid-vs-redshift.html b/docs/0.21.0/comparisons/druid-vs-redshift.html
similarity index 53%
copy from docs/latest/comparisons/druid-vs-redshift.html
copy to docs/0.21.0/comparisons/druid-vs-redshift.html
index c31cb72..bf9d9b3 100644
--- a/docs/latest/comparisons/druid-vs-redshift.html
+++ b/docs/0.21.0/comparisons/druid-vs-redshift.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Apache Druid vs Redshift · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/comparisons/druid-vs-redshift.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" cont [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Apache Druid vs Redshift · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/comparisons/druid-vs-redshift.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" cont [...]
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               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
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+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
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@@ -99,7 +99,7 @@
 <h3><a class="anchor" aria-hidden="true" id="indexing-strategy"></a><a href="#indexing-strategy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2- [...]
 <p>Along with column oriented structures, Druid uses indexing structures to speed up query execution when a filter is provided. Indexing structures do increase storage overhead (and make it more difficult to allow for mutation), but they also significantly speed up queries.</p>
 <p>ParAccel does not appear to employ indexing strategies.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/comparisons/druid-vs-kudu.html"><span class="arrow-prev">← </span><span>Apache Druid vs Kudu</span></a><a class="docs-next button" href="/docs/latest/comparisons/druid-vs-spark.html"><span>Apache Druid vs Spark</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div c [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/comparisons/druid-vs-kudu.html"><span class="arrow-prev">← </span><span>Apache Druid vs Kudu</span></a><a class="docs-next button" href="/docs/0.21.0/comparisons/druid-vs-spark.html"><span>Apache Druid vs Spark</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div c [...]
                 document.addEventListener('keyup', function(e) {
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@@ -116,6 +116,6 @@
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\ No newline at end of file
diff --git a/docs/0.21.0/comparisons/druid-vs-spark.html b/docs/0.21.0/comparisons/druid-vs-spark.html
new file mode 100644
index 0000000..2938fa3
--- /dev/null
+++ b/docs/0.21.0/comparisons/druid-vs-spark.html
@@ -0,0 +1,112 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Apache Druid vs Spark · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/comparisons/druid-vs-spark.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0 [...]
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            var coll = document.getElementsByClassName('collapsible');
+            var checkActiveCategory = true;
+            for (var i = 0; i < coll.length; i++) {
+              var links = coll[i].nextElementSibling.getElementsByTagName('*');
+              if (checkActiveCategory){
+                for (var j = 0; j < links.length; j++) {
+                  if (links[j].classList.contains('navListItemActive')){
+                    coll[i].nextElementSibling.classList.toggle('hide');
+                    coll[i].childNodes[1].classList.toggle('rotate');
+                    checkActiveCategory = false;
+                    break;
+                  }
+                }
+              }
+
+              coll[i].addEventListener('click', function() {
+                var arrow = this.childNodes[1];
+                arrow.classList.toggle('rotate');
+                var content = this.nextElementSibling;
+                content.classList.toggle('hide');
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+            }
+
+            document.addEventListener('DOMContentLoaded', function() {
+              createToggler('#navToggler', '#docsNav', 'docsSliderActive');
+              createToggler('#tocToggler', 'body', 'tocActive');
+
+              var headings = document.querySelector('.toc-headings');
+              headings && headings.addEventListener('click', function(event) {
+                var el = event.target;
+                while(el !== headings){
+                  if (el.tagName === 'A') {
+                    document.body.classList.remove('tocActive');
+                    break;
+                  } else{
+                    el = el.parentNode;
+                  }
+                }
+              }, false);
+
+              function createToggler(togglerSelector, targetSelector, className) {
+                var toggler = document.querySelector(togglerSelector);
+                var target = document.querySelector(targetSelector);
+
+                if (!toggler) {
+                  return;
+                }
+
+                toggler.onclick = function(event) {
+                  event.preventDefault();
+
+                  target.classList.toggle(className);
+                };
+              }
+            });
+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/comparisons/druid-vs-spark.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Apache Druid vs Spark</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>Druid and Spark are complementary solutions as Druid can be used to accelerate OLAP queries in Spark.</p>
+<p>Spark is a general cluster computing framework initially designed around the concept of Resilient Distributed Datasets (RDDs).
+RDDs enable data reuse by persisting intermediate results
+in memory and enable Spark to provide fast computations for iterative algorithms.
+This is especially beneficial for certain work flows such as machine
+learning, where the same operation may be applied over and over
+again until some result is converged upon. The generality of Spark makes it very suitable as an engine to process (clean or transform) data.
+Although Spark provides the ability to query data through Spark SQL, much like Hadoop, the query latencies are not specifically targeted to be interactive (sub-second).</p>
+<p>Druid's focus is on extremely low latency queries, and is ideal for powering applications used by thousands of users, and where each query must
+return fast enough such that users can interactively explore through data. Druid fully indexes all data, and can act as a middle layer between Spark and your application.
+One typical setup seen in production is to process data in Spark, and load the processed data into Druid for faster access.</p>
+<p>For more information about using Druid and Spark together, including benchmarks of the two systems, please see:</p>
+<p><a href="https://www.linkedin.com/pulse/combining-druid-spark-interactive-flexible-analytics-scale-butani">https://www.linkedin.com/pulse/combining-druid-spark-interactive-flexible-analytics-scale-butani</a></p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/comparisons/druid-vs-redshift.html"><span class="arrow-prev">← </span><span>Apache Druid vs Redshift</span></a><a class="docs-next button" href="/docs/0.21.0/comparisons/druid-vs-sql-on-hadoop.html"><span>Apache Druid vs SQL-on-Hadoop</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div  [...]
+                document.addEventListener('keyup', function(e) {
+                  if (e.target !== document.body) {
+                    return;
+                  }
+                  // keyCode for '/' (slash)
+                  if (e.keyCode === 191) {
+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
+                apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
+                indexName: 'apache_druid',
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+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
+              });
+            </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/comparisons/druid-vs-sql-on-hadoop.html b/docs/0.21.0/comparisons/druid-vs-sql-on-hadoop.html
similarity index 53%
copy from docs/latest/comparisons/druid-vs-sql-on-hadoop.html
copy to docs/0.21.0/comparisons/druid-vs-sql-on-hadoop.html
index c7bb4a6..d70e59f 100644
--- a/docs/latest/comparisons/druid-vs-sql-on-hadoop.html
+++ b/docs/0.21.0/comparisons/druid-vs-sql-on-hadoop.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Apache Druid vs SQL-on-Hadoop · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/comparisons/druid-vs-sql-on-hadoop.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:ver [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Apache Druid vs SQL-on-Hadoop · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/comparisons/druid-vs-sql-on-hadoop.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:ver [...]
               window.dataLayer = window.dataLayer || [];
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               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -121,7 +121,7 @@ base Druid is less flexible than SQL-on-Hadoop solutions for generic processing.
 relies on external sources to pull data out of it.</p>
 <p>Druid's storage format is highly optimized for linear scans. Although Druid has support for nested data, Parquet's storage format is much
 more hierarchical, and is more designed for binary chunking. In theory, this should lead to faster scans in Druid.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/comparisons/druid-vs-spark.html"><span class="arrow-prev">← </span><span>Apache Druid vs Spark</span></a><a class="docs-next button" href="/docs/latest/design/auth.html"><span>Authentication and Authorization</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#druid-vs-parquet">Druid vs Parquet</a></li></ul></nav></ [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/comparisons/druid-vs-spark.html"><span class="arrow-prev">← </span><span>Apache Druid vs Spark</span></a><a class="docs-next button" href="/docs/0.21.0/design/auth.html"><span>Authentication and Authorization</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#druid-vs-parquet">Druid vs Parquet</a></li></ul></nav></ [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -138,6 +138,6 @@ more hierarchical, and is more designed for binary chunking. In theory, this sho
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/comparisons/druid-vs-vertica.html b/docs/0.21.0/comparisons/druid-vs-vertica.html
new file mode 100644
index 0000000..a1d74ac
--- /dev/null
+++ b/docs/0.21.0/comparisons/druid-vs-vertica.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="druid-vs-redshift.html">
+<meta http-equiv="refresh" content="0; url=druid-vs-redshift.html">
+<h1>Redirecting...</h1>
+<a href="druid-vs-redshift.html">Click here if you are not redirected.</a>
+<script>location="druid-vs-redshift.html"</script>
diff --git a/docs/0.21.0/configuration/auth.html b/docs/0.21.0/configuration/auth.html
new file mode 100644
index 0000000..ea2aebe
--- /dev/null
+++ b/docs/0.21.0/configuration/auth.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../design/auth.html">
+<meta http-equiv="refresh" content="0; url=../design/auth.html">
+<h1>Redirecting...</h1>
+<a href="../design/auth.html">Click here if you are not redirected.</a>
+<script>location="../design/auth.html"</script>
diff --git a/docs/0.21.0/configuration/broker.html b/docs/0.21.0/configuration/broker.html
new file mode 100644
index 0000000..72363c4
--- /dev/null
+++ b/docs/0.21.0/configuration/broker.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../configuration/index.html#broker">
+<meta http-equiv="refresh" content="0; url=../configuration/index.html#broker">
+<h1>Redirecting...</h1>
+<a href="../configuration/index.html#broker">Click here if you are not redirected.</a>
+<script>location="../configuration/index.html#broker"</script>
diff --git a/docs/0.21.0/configuration/caching.html b/docs/0.21.0/configuration/caching.html
new file mode 100644
index 0000000..dcb5dd6
--- /dev/null
+++ b/docs/0.21.0/configuration/caching.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../configuration/index.html#cache-configuration">
+<meta http-equiv="refresh" content="0; url=../configuration/index.html#cache-configuration">
+<h1>Redirecting...</h1>
+<a href="../configuration/index.html#cache-configuration">Click here if you are not redirected.</a>
+<script>location="../configuration/index.html#cache-configuration"</script>
diff --git a/docs/0.21.0/configuration/coordinator.html b/docs/0.21.0/configuration/coordinator.html
new file mode 100644
index 0000000..e32a17a
--- /dev/null
+++ b/docs/0.21.0/configuration/coordinator.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../configuration/index.html#coordinator">
+<meta http-equiv="refresh" content="0; url=../configuration/index.html#coordinator">
+<h1>Redirecting...</h1>
+<a href="../configuration/index.html#coordinator">Click here if you are not redirected.</a>
+<script>location="../configuration/index.html#coordinator"</script>
diff --git a/docs/0.21.0/configuration/hadoop.html b/docs/0.21.0/configuration/hadoop.html
new file mode 100644
index 0000000..a14b2fb
--- /dev/null
+++ b/docs/0.21.0/configuration/hadoop.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../ingestion/hadoop.html">
+<meta http-equiv="refresh" content="0; url=../ingestion/hadoop.html">
+<h1>Redirecting...</h1>
+<a href="../ingestion/hadoop.html">Click here if you are not redirected.</a>
+<script>location="../ingestion/hadoop.html"</script>
diff --git a/docs/0.21.0/configuration/historical.html b/docs/0.21.0/configuration/historical.html
new file mode 100644
index 0000000..1112bc0
--- /dev/null
+++ b/docs/0.21.0/configuration/historical.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../configuration/index.html#historical">
+<meta http-equiv="refresh" content="0; url=../configuration/index.html#historical">
+<h1>Redirecting...</h1>
+<a href="../configuration/index.html#historical">Click here if you are not redirected.</a>
+<script>location="../configuration/index.html#historical"</script>
diff --git a/docs/latest/configuration/human-readable-byte.html b/docs/0.21.0/configuration/human-readable-byte.html
similarity index 97%
copy from docs/latest/configuration/human-readable-byte.html
copy to docs/0.21.0/configuration/human-readable-byte.html
index 7433c4f..00ef8e6 100644
--- a/docs/latest/configuration/human-readable-byte.html
+++ b/docs/0.21.0/configuration/human-readable-byte.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Human-readable Byte Configuration Reference · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/configuration/human-readable-byte.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name=" [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Human-readable Byte Configuration Reference · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/configuration/human-readable-byte.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name=" [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
   ~ Licensed to the Apache Software Foundation (ASF) under one
   ~ or more contributor license agreements.  See the NOTICE file
   ~ distributed with this work for additional information
@@ -66,7 +66,7 @@
 <pre><code class="hljs css language-properties"><span class="hljs-comment"># 256MiB bytes = 256 * 1024 * 1024 bytes</span>
 <span class="hljs-meta">druid.cache.sizeInBytes</span>=<span class="hljs-string">256MiB </span>
 </code></pre>
-</span></div></article></div><div class="docs-prevnext"></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#a-number-in-bytes">A number in bytes</a></li><li><a href="#a-number-with-a-unit-suffix">A number with a unit suffix</a><ul class="toc-headings"><li><a href="#supported-units">Supported Units</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Techn [...]
+</span></div></article></div><div class="docs-prevnext"></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#a-number-in-bytes">A number in bytes</a></li><li><a href="#a-number-with-a-unit-suffix">A number with a unit suffix</a><ul class="toc-headings"><li><a href="#supported-units">Supported Units</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Techn [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -83,6 +83,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
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             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/configuration/index.html b/docs/0.21.0/configuration/index.html
similarity index 89%
copy from docs/latest/configuration/index.html
copy to docs/0.21.0/configuration/index.html
index 598045d..459799a 100644
--- a/docs/latest/configuration/index.html
+++ b/docs/0.21.0/configuration/index.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Configuration reference · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/configuration/index.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.2 [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Configuration reference · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/configuration/index.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21.0 [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
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@@ -112,7 +112,7 @@ jvm.config         <span class="hljs-keyword">runtime</span>.properties
 <h3><a class="anchor" aria-hidden="true" id="jvm-configuration-best-practices"></a><a href="#jvm-configuration-best-practices" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13. [...]
 <p>There are four JVM parameters that we set on all of our processes:</p>
 <ol>
-<li><code>-Duser.timezone=UTC</code> This sets the default timezone of the JVM to UTC. We always set this and do not test with other default timezones, so local timezones might work, but they also might uncover weird and interesting bugs. To issue queries in a non-UTC timezone, see <a href="../querying/granularities.html#period-granularities">query granularities</a></li>
+<li><code>-Duser.timezone=UTC</code> This sets the default timezone of the JVM to UTC. We always set this and do not test with other default timezones, so local timezones might work, but they also might uncover weird and interesting bugs. To issue queries in a non-UTC timezone, see <a href="/docs/0.21.0/querying/granularities.html#period-granularities">query granularities</a></li>
 <li><code>-Dfile.encoding=UTF-8</code> This is similar to timezone, we test assuming UTF-8. Local encodings might work, but they also might result in weird and interesting bugs.</li>
 <li><code>-Djava.io.tmpdir=&lt;a path&gt;</code> Various parts of the system that interact with the file system do it via temporary files, and these files can get somewhat large. Many production systems are set up to have small (but fast) <code>/tmp</code> directories, which can be problematic with Druid so we recommend pointing the JVM’s tmp directory to something with a little more meat. This directory should not be volatile tmpfs. This directory should also have good read and write sp [...]
 <li><code>-Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager</code> This allows log4j2 to handle logs for non-log4j2 components (like jetty) which use standard java logging.</li>
@@ -152,7 +152,7 @@ jvm.config         <span class="hljs-keyword">runtime</span>.properties
 <tr><td><code>druid.zk.paths.base</code></td><td>Base Zookeeper path.</td><td><code>/druid</code></td></tr>
 <tr><td><code>druid.zk.service.host</code></td><td>The ZooKeeper hosts to connect to. This is a REQUIRED property and therefore a host address must be supplied.</td><td>none</td></tr>
 <tr><td><code>druid.zk.service.user</code></td><td>The username to authenticate with ZooKeeper. This is an optional property.</td><td>none</td></tr>
-<tr><td><code>druid.zk.service.pwd</code></td><td>The <a href="/docs/latest/operations/password-provider.html">Password Provider</a> or the string password to authenticate with ZooKeeper. This is an optional property.</td><td>none</td></tr>
+<tr><td><code>druid.zk.service.pwd</code></td><td>The <a href="/docs/0.21.0/operations/password-provider.html">Password Provider</a> or the string password to authenticate with ZooKeeper. This is an optional property.</td><td>none</td></tr>
 <tr><td><code>druid.zk.service.authScheme</code></td><td>digest is the only authentication scheme supported.</td><td>digest</td></tr>
 </tbody>
 </table>
@@ -240,9 +240,9 @@ That is, it allows Druid to keep the connections of Exhibitor-supervised ZooKeep
 and <code>druid.tlsPort</code> properties on each process. Please see <code>Configuration</code> section of individual processes to check the valid and default values for these ports.</p>
 <h4><a class="anchor" aria-hidden="true" id="jetty-server-tls-configuration"></a><a href="#jetty-server-tls-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 1 [...]
 <p>Druid uses Jetty as an embedded web server. To get familiar with TLS/SSL in general and related concepts like Certificates etc.
-reading this <a href="http://www.eclipse.org/jetty/documentation/9.4.x/configuring-ssl.html">Jetty documentation</a> might be helpful.
+reading this <a href="http://www.eclipse.org/jetty/documentation/9.4.32.v20200930/configuring-ssl.html">Jetty documentation</a> might be helpful.
 To get more in depth knowledge of TLS/SSL support in Java in general, please refer to this <a href="http://docs.oracle.com/javase/8/docs/technotes/guides/security/jsse/JSSERefGuide.html">guide</a>.
-The documentation <a href="http://www.eclipse.org/jetty/documentation/9.4.x/configuring-ssl.html#configuring-sslcontextfactory">here</a>
+The documentation <a href="http://www.eclipse.org/jetty/documentation/9.4.32.v20200930/configuring-ssl.html#configuring-sslcontextfactory">here</a>
 can help in understanding TLS/SSL configurations listed below. This <a href="http://docs.oracle.com/javase/8/docs/technotes/guides/security/StandardNames.html">document</a> lists all the possible
 values for the below mentioned configs among others provided by Java implementation.</p>
 <table>
@@ -253,7 +253,7 @@ values for the below mentioned configs among others provided by Java implementat
 <tr><td><code>druid.server.https.keyStorePath</code></td><td>The file path or URL of the TLS/SSL Key store.</td><td>none</td><td>yes</td></tr>
 <tr><td><code>druid.server.https.keyStoreType</code></td><td>The type of the key store.</td><td>none</td><td>yes</td></tr>
 <tr><td><code>druid.server.https.certAlias</code></td><td>Alias of TLS/SSL certificate for the connector.</td><td>none</td><td>yes</td></tr>
-<tr><td><code>druid.server.https.keyStorePassword</code></td><td>The <a href="/docs/latest/operations/password-provider.html">Password Provider</a> or String password for the Key Store.</td><td>none</td><td>yes</td></tr>
+<tr><td><code>druid.server.https.keyStorePassword</code></td><td>The <a href="/docs/0.21.0/operations/password-provider.html">Password Provider</a> or String password for the Key Store.</td><td>none</td><td>yes</td></tr>
 </tbody>
 </table>
 <p>Following table contains non-mandatory advanced configuration options, use caution.</p>
@@ -263,7 +263,7 @@ values for the below mentioned configs among others provided by Java implementat
 </thead>
 <tbody>
 <tr><td><code>druid.server.https.keyManagerFactoryAlgorithm</code></td><td>Algorithm to use for creating KeyManager, more details <a href="https://docs.oracle.com/javase/7/docs/technotes/guides/security/jsse/JSSERefGuide.html#KeyManager">here</a>.</td><td><code>javax.net.ssl.KeyManagerFactory.getDefaultAlgorithm()</code></td><td>no</td></tr>
-<tr><td><code>druid.server.https.keyManagerPassword</code></td><td>The <a href="/docs/latest/operations/password-provider.html">Password Provider</a> or String password for the Key Manager.</td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.server.https.keyManagerPassword</code></td><td>The <a href="/docs/0.21.0/operations/password-provider.html">Password Provider</a> or String password for the Key Manager.</td><td>none</td><td>no</td></tr>
 <tr><td><code>druid.server.https.includeCipherSuites</code></td><td>List of cipher suite names to include. You can either use the exact cipher suite name or a regular expression.</td><td>Jetty's default include cipher list</td><td>no</td></tr>
 <tr><td><code>druid.server.https.excludeCipherSuites</code></td><td>List of cipher suite names to exclude. You can either use the exact cipher suite name or a regular expression.</td><td>Jetty's default exclude cipher list</td><td>no</td></tr>
 <tr><td><code>druid.server.https.includeProtocols</code></td><td>List of exact protocols names to include.</td><td>Jetty's default include protocol list</td><td>no</td></tr>
@@ -281,7 +281,7 @@ values for the below mentioned configs among others provided by Java implementat
 <tr><td><code>druid.client.https.trustStoreType</code></td><td>The type of the key store where trusted root certificates are stored.</td><td><code>java.security.KeyStore.getDefaultType()</code></td><td>no</td></tr>
 <tr><td><code>druid.client.https.trustStorePath</code></td><td>The file path or URL of the TLS/SSL Key store where trusted root certificates are stored.</td><td>none</td><td>yes</td></tr>
 <tr><td><code>druid.client.https.trustStoreAlgorithm</code></td><td>Algorithm to be used by TrustManager to validate certificate chains</td><td><code>javax.net.ssl.TrustManagerFactory.getDefaultAlgorithm()</code></td><td>no</td></tr>
-<tr><td><code>druid.client.https.trustStorePassword</code></td><td>The <a href="/docs/latest/operations/password-provider.html">Password Provider</a> or String password for the Trust Store.</td><td>none</td><td>yes</td></tr>
+<tr><td><code>druid.client.https.trustStorePassword</code></td><td>The <a href="/docs/0.21.0/operations/password-provider.html">Password Provider</a> or String password for the Trust Store.</td><td>none</td><td>yes</td></tr>
 </tbody>
 </table>
 <p>This <a href="http://docs.oracle.com/javase/8/docs/technotes/guides/security/StandardNames.html">document</a> lists all the possible
@@ -299,7 +299,7 @@ values for the above mentioned configs among others provided by Java implementat
 <tr><td><code>druid.auth.allowUnauthenticatedHttpOptions</code></td><td>Boolean</td><td>If true, skip authentication checks for HTTP OPTIONS requests. This is needed for certain use cases, such as supporting CORS pre-flight requests. Note that disabling authentication checks for OPTIONS requests will allow unauthenticated users to determine what Druid endpoints are valid (by checking if the OPTIONS request returns a 200 instead of 404), so enabling this option may reveal information abou [...]
 </tbody>
 </table>
-<p>For more information, please see <a href="/docs/latest/design/auth.html">Authentication and Authorization</a>.</p>
+<p>For more information, please see <a href="/docs/0.21.0/design/auth.html">Authentication and Authorization</a>.</p>
 <p>For configuration options for specific auth extensions, please refer to the extension documentation.</p>
 <h3><a class="anchor" aria-hidden="true" id="startup-logging"></a><a href="#startup-logging" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5  [...]
 <p>All processes can log debugging information on startup.</p>
@@ -323,7 +323,7 @@ values for the above mentioned configs among others provided by Java implementat
 <tr><td><code>druid.request.logging.type</code></td><td>Choices: noop, file, emitter, slf4j, filtered, composing, switching. How to log every query request.</td><td>[required to configure request logging]</td></tr>
 </tbody>
 </table>
-<p>Note that, you can enable sending all the HTTP requests to log by setting  &quot;org.apache.druid.jetty.RequestLog&quot; to DEBUG level. See <a href="/docs/latest/configuration/logging.html">Logging</a></p>
+<p>Note that, you can enable sending all the HTTP requests to log by setting  &quot;org.apache.druid.jetty.RequestLog&quot; to DEBUG level. See <a href="/docs/0.21.0/configuration/logging.html">Logging</a></p>
 <h4><a class="anchor" aria-hidden="true" id="file-request-logging"></a><a href="#file-request-logging" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1 [...]
 <p>Daily request logs are stored on disk.</p>
 <table>
@@ -390,7 +390,7 @@ For native query, only request logs where query/time is above the threshold are
 <tbody>
 <tr><td><code>druid.request.logging.queryTimeThresholdMs</code></td><td>Threshold value for query/time in milliseconds.</td><td>0, i.e., no filtering</td></tr>
 <tr><td><code>druid.request.logging.sqlQueryTimeThresholdMs</code></td><td>Threshold value for sqlQuery/time in milliseconds.</td><td>0, i.e., no filtering</td></tr>
-<tr><td><code>druid.request.logging.mutedQueryTypes</code></td><td>Query requests of these types are not logged. Query types are defined as string objects corresponding to the &quot;queryType&quot; value for the specified query in the Druid's <a href="http://druid.apache.org/docs/latest/querying/querying.html">native JSON query API</a>. Misspelled query types will be ignored. Example to ignore scan and timeBoundary queries: [&quot;scan&quot;, &quot;timeBoundary&quot;]</td><td>[]</td></tr>
+<tr><td><code>druid.request.logging.mutedQueryTypes</code></td><td>Query requests of these types are not logged. Query types are defined as string objects corresponding to the &quot;queryType&quot; value for the specified query in the Druid's <a href="http://druid.apache.org/docs/latest/querying/querying">native JSON query API</a>. Misspelled query types will be ignored. Example to ignore scan and timeBoundary queries: [&quot;scan&quot;, &quot;timeBoundary&quot;]</td><td>[]</td></tr>
 <tr><td><code>druid.request.logging.delegate.type</code></td><td>Type of delegate request logger to log requests.</td><td>none</td></tr>
 </tbody>
 </table>
@@ -458,7 +458,7 @@ For native query, only request logs where query/time is above the threshold are
 </tbody>
 </table>
 <h3><a class="anchor" aria-hidden="true" id="emitting-metrics"></a><a href="#emitting-metrics" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2. [...]
-<p>The Druid servers <a href="/docs/latest/operations/metrics.html">emit various metrics</a> and alerts via something we call an Emitter. There are three emitter implementations included with the code, a &quot;noop&quot; emitter (the default if none is specified), one that just logs to log4j (&quot;logging&quot;), and one that does POSTs of JSON events to a server (&quot;http&quot;). The properties for using the logging emitter are described below.</p>
+<p>The Druid servers <a href="/docs/0.21.0/operations/metrics.html">emit various metrics</a> and alerts via something we call an Emitter. There are three emitter implementations included with the code, a &quot;noop&quot; emitter (the default if none is specified), one that just logs to log4j (&quot;logging&quot;), and one that does POSTs of JSON events to a server (&quot;http&quot;). The properties for using the logging emitter are described below.</p>
 <table>
 <thead>
 <tr><th>Property</th><th>Description</th><th>Default</th></tr>
@@ -485,7 +485,7 @@ For native query, only request logs where query/time is above the threshold are
 <tbody>
 <tr><td><code>druid.emitter.http.flushMillis</code></td><td>How often the internal message buffer is flushed (data is sent).</td><td>60000</td></tr>
 <tr><td><code>druid.emitter.http.flushCount</code></td><td>How many messages the internal message buffer can hold before flushing (sending).</td><td>500</td></tr>
-<tr><td><code>druid.emitter.http.basicAuthentication</code></td><td><a href="/docs/latest/operations/password-provider.html">Password Provider</a> for providing Login and password for authentication in &quot;login:password&quot; form, e.g., <code>druid.emitter.http.basicAuthentication=admin:adminpassword</code> uses Default Password Provider which allows plain text passwords.</td><td>not specified = no authentication</td></tr>
+<tr><td><code>druid.emitter.http.basicAuthentication</code></td><td><a href="/docs/0.21.0/operations/password-provider.html">Password Provider</a> for providing Login and password for authentication in &quot;login:password&quot; form, e.g., <code>druid.emitter.http.basicAuthentication=admin:adminpassword</code> uses Default Password Provider which allows plain text passwords.</td><td>not specified = no authentication</td></tr>
 <tr><td><code>druid.emitter.http.flushTimeOut</code></td><td>The timeout after which an event should be sent to the endpoint, even if internal buffers are not filled, in milliseconds.</td><td>not specified = no timeout</td></tr>
 <tr><td><code>druid.emitter.http.batchingStrategy</code></td><td>The strategy of how the batch is formatted. &quot;ARRAY&quot; means <code>[event1,event2]</code>, &quot;NEWLINES&quot; means <code>event1\nevent2</code>, ONLY_EVENTS means <code>event1event2</code>.</td><td>ARRAY</td></tr>
 <tr><td><code>druid.emitter.http.maxBatchSize</code></td><td>The maximum batch size, in bytes.</td><td>the minimum of (10% of JVM heap size divided by 2) or (5191680 (i. e. 5 MB))</td></tr>
@@ -496,7 +496,7 @@ For native query, only request logs where query/time is above the threshold are
 </table>
 <h4><a class="anchor" aria-hidden="true" id="http-emitter-module-tls-overrides"></a><a href="#http-emitter-module-tls-overrides" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S1 [...]
 <p>When emitting events to a TLS-enabled receiver, the Http Emitter will by default use an SSLContext obtained via the
-process described at <a href="../operations/tls-support.html">Druid's internal communication over TLS</a>, i.e., the same
+process described at <a href="/docs/0.21.0/operations/tls-support.html">Druid's internal communication over TLS</a>, i.e., the same
 SSLContext that would be used for internal communications between Druid processes.</p>
 <p>In some use cases it may be desirable to have the Http Emitter use its own separate truststore configuration. For example, there may be organizational policies that prevent the TLS-enabled metrics receiver's certificate from being added to the same truststore used by Druid's internal HTTP client.</p>
 <p>The following properties allow the Http Emitter to use its own truststore configuration when building its SSLContext.</p>
@@ -509,7 +509,7 @@ SSLContext that would be used for internal communications between Druid processe
 <tr><td><code>druid.emitter.http.ssl.trustStorePath</code></td><td>The file path or URL of the TLS/SSL Key store where trusted root certificates are stored. If this is unspecified, the Http Emitter will use the same SSLContext as Druid's internal HTTP client, as described in the beginning of this section, and all other properties below are ignored.</td><td>null</td></tr>
 <tr><td><code>druid.emitter.http.ssl.trustStoreType</code></td><td>The type of the key store where trusted root certificates are stored.</td><td><code>java.security.KeyStore.getDefaultType()</code></td></tr>
 <tr><td><code>druid.emitter.http.ssl.trustStoreAlgorithm</code></td><td>Algorithm to be used by TrustManager to validate certificate chains</td><td><code>javax.net.ssl.TrustManagerFactory.getDefaultAlgorithm()</code></td></tr>
-<tr><td><code>druid.emitter.http.ssl.trustStorePassword</code></td><td>The <a href="/docs/latest/operations/password-provider.html">Password Provider</a> or String password for the Trust Store.</td><td>none</td></tr>
+<tr><td><code>druid.emitter.http.ssl.trustStorePassword</code></td><td>The <a href="/docs/0.21.0/operations/password-provider.html">Password Provider</a> or String password for the Trust Store.</td><td>none</td></tr>
 <tr><td><code>druid.emitter.http.ssl.protocol</code></td><td>TLS protocol to use.</td><td>&quot;TLSv1.2&quot;</td></tr>
 </tbody>
 </table>
@@ -536,9 +536,9 @@ Except <code>recipientBaseUrl</code>. E.g., <code>druid.emitter.parametrized.htt
 </tbody>
 </table>
 <h4><a class="anchor" aria-hidden="true" id="graphite-emitter"></a><a href="#graphite-emitter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2. [...]
-<p>To use graphite as emitter set <code>druid.emitter=graphite</code>. For configuration details please follow this <a href="/docs/latest/development/extensions-contrib/graphite.html">link</a>.</p>
+<p>To use graphite as emitter set <code>druid.emitter=graphite</code>. For configuration details please follow this <a href="/docs/0.21.0/development/extensions-contrib/graphite.html">link</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="metadata-storage"></a><a href="#metadata-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2. [...]
-<p>These properties specify the JDBC connection and other configuration around the metadata storage. The only processes that connect to the metadata storage with these properties are the <a href="/docs/latest/design/coordinator.html">Coordinator</a> and <a href="/docs/latest/design/overlord.html">Overlord</a>.</p>
+<p>These properties specify the JDBC connection and other configuration around the metadata storage. The only processes that connect to the metadata storage with these properties are the <a href="/docs/0.21.0/design/coordinator.html">Coordinator</a> and <a href="/docs/0.21.0/design/overlord.html">Overlord</a>.</p>
 <table>
 <thead>
 <tr><th>Property</th><th>Description</th><th>Default</th></tr>
@@ -547,10 +547,10 @@ Except <code>recipientBaseUrl</code>. E.g., <code>druid.emitter.parametrized.htt
 <tr><td><code>druid.metadata.storage.type</code></td><td>The type of metadata storage to use. Choose from &quot;mysql&quot;, &quot;postgresql&quot;, or &quot;derby&quot;.</td><td>derby</td></tr>
 <tr><td><code>druid.metadata.storage.connector.connectURI</code></td><td>The JDBC URI for the database to connect to</td><td>none</td></tr>
 <tr><td><code>druid.metadata.storage.connector.user</code></td><td>The username to connect with.</td><td>none</td></tr>
-<tr><td><code>druid.metadata.storage.connector.password</code></td><td>The <a href="/docs/latest/operations/password-provider.html">Password Provider</a> or String password used to connect with.</td><td>none</td></tr>
+<tr><td><code>druid.metadata.storage.connector.password</code></td><td>The <a href="/docs/0.21.0/operations/password-provider.html">Password Provider</a> or String password used to connect with.</td><td>none</td></tr>
 <tr><td><code>druid.metadata.storage.connector.createTables</code></td><td>If Druid requires a table and it doesn't exist, create it?</td><td>true</td></tr>
 <tr><td><code>druid.metadata.storage.tables.base</code></td><td>The base name for tables.</td><td>druid</td></tr>
-<tr><td><code>druid.metadata.storage.tables.dataSource</code></td><td>The table to use to look for dataSources which created by <a href="/docs/latest/development/extensions-core/kafka-ingestion.html">Kafka Indexing Service</a>.</td><td>druid_dataSource</td></tr>
+<tr><td><code>druid.metadata.storage.tables.dataSource</code></td><td>The table to use to look for dataSources which created by <a href="/docs/0.21.0/development/extensions-core/kafka-ingestion.html">Kafka Indexing Service</a>.</td><td>druid_dataSource</td></tr>
 <tr><td><code>druid.metadata.storage.tables.pendingSegments</code></td><td>The table to use to look for pending segments.</td><td>druid_pendingSegments</td></tr>
 <tr><td><code>druid.metadata.storage.tables.segments</code></td><td>The table to use to look for segments.</td><td>druid_segments</td></tr>
 <tr><td><code>druid.metadata.storage.tables.rules</code></td><td>The table to use to look for segment load/drop rules.</td><td>druid_rules</td></tr>
@@ -563,7 +563,7 @@ Except <code>recipientBaseUrl</code>. E.g., <code>druid.emitter.parametrized.htt
 </tbody>
 </table>
 <h3><a class="anchor" aria-hidden="true" id="deep-storage"></a><a href="#deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83. [...]
-<p>The configurations concern how to push and pull <a href="/docs/latest/design/segments.html">Segments</a> from deep storage.</p>
+<p>The configurations concern how to push and pull <a href="/docs/0.21.0/design/segments.html">Segments</a> from deep storage.</p>
 <table>
 <thead>
 <tr><th>Property</th><th>Description</th><th>Default</th></tr>
@@ -586,7 +586,7 @@ Except <code>recipientBaseUrl</code>. E.g., <code>druid.emitter.parametrized.htt
 <p>This deep storage doesn't do anything. There are no configs.</p>
 <h4><a class="anchor" aria-hidden="true" id="s3-deep-storage"></a><a href="#s3-deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5  [...]
 <p>This deep storage is used to interface with Amazon's S3. Note that the <code>druid-s3-extensions</code> extension must be loaded.
-The below table shows some important configurations for S3. See <a href="/docs/latest/development/extensions-core/s3.html">S3 Deep Storage</a> for full configurations.</p>
+The below table shows some important configurations for S3. See <a href="/docs/0.21.0/development/extensions-core/s3.html">S3 Deep Storage</a> for full configurations.</p>
 <table>
 <thead>
 <tr><th>Property</th><th>Description</th><th>Default</th></tr>
@@ -594,10 +594,10 @@ The below table shows some important configurations for S3. See <a href="/docs/l
 <tbody>
 <tr><td><code>druid.storage.bucket</code></td><td>S3 bucket name.</td><td>none</td></tr>
 <tr><td><code>druid.storage.baseKey</code></td><td>S3 object key prefix for storage.</td><td>none</td></tr>
-<tr><td><code>druid.storage.disableAcl</code></td><td>Boolean flag for ACL. If this is set to <code>false</code>, the full control would be granted to the bucket owner. This may require to set additional permissions. See <a href="../development/extensions-core/s3.html#s3-permissions-settings">S3 permissions settings</a>.</td><td>false</td></tr>
+<tr><td><code>druid.storage.disableAcl</code></td><td>Boolean flag for ACL. If this is set to <code>false</code>, the full control would be granted to the bucket owner. This may require to set additional permissions. See <a href="/docs/0.21.0/development/extensions-core/s3.html#s3-permissions-settings">S3 permissions settings</a>.</td><td>false</td></tr>
 <tr><td><code>druid.storage.archiveBucket</code></td><td>S3 bucket name for archiving when running the <em>archive task</em>.</td><td>none</td></tr>
 <tr><td><code>druid.storage.archiveBaseKey</code></td><td>S3 object key prefix for archiving.</td><td>none</td></tr>
-<tr><td><code>druid.storage.sse.type</code></td><td>Server-side encryption type. Should be one of <code>s3</code>, <code>kms</code>, and <code>custom</code>. See the below <a href="../development/extensions-core/s3.html#server-side-encryption">Server-side encryption section</a> for more details.</td><td>None</td></tr>
+<tr><td><code>druid.storage.sse.type</code></td><td>Server-side encryption type. Should be one of <code>s3</code>, <code>kms</code>, and <code>custom</code>. See the below <a href="/docs/0.21.0/development/extensions-core/s3.html#server-side-encryption">Server-side encryption section</a> for more details.</td><td>None</td></tr>
 <tr><td><code>druid.storage.sse.kms.keyId</code></td><td>AWS KMS key ID. This is used only when <code>druid.storage.sse.type</code> is <code>kms</code> and can be empty to use the default key ID.</td><td>None</td></tr>
 <tr><td><code>druid.storage.sse.custom.base64EncodedKey</code></td><td>Base64-encoded key. Should be specified if <code>druid.storage.sse.type</code> is <code>custom</code>.</td><td>None</td></tr>
 <tr><td><code>druid.storage.useS3aSchema</code></td><td>If true, use the &quot;s3a&quot; filesystem when using Hadoop-based ingestion. If false, the &quot;s3n&quot; filesystem will be used. Only affects Hadoop-based ingestion.</td><td>false</td></tr>
@@ -625,13 +625,36 @@ The below table shows some important configurations for S3. See <a href="/docs/l
 </tbody>
 </table>
 <h3><a class="anchor" aria-hidden="true" id="ingestion-security-configuration"></a><a href="#ingestion-security-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13. [...]
+<h4><a class="anchor" aria-hidden="true" id="hdfs-input-source"></a><a href="#hdfs-input-source" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2- [...]
+<p>You can set the following property to specify permissible protocols for
+the <a href="/docs/0.21.0/ingestion/native-batch.html#hdfs-input-source">HDFS input source</a> and the <a href="/docs/0.21.0/ingestion/native-batch.html#hdfsfirehose">HDFS firehose</a>.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.ingestion.hdfs.allowedProtocols</code></td><td>List of protocols</td><td>Allowed protocols for the HDFS input source and HDFS firehose.</td><td>[&quot;hdfs&quot;]</td></tr>
+</tbody>
+</table>
+<h4><a class="anchor" aria-hidden="true" id="http-input-source"></a><a href="#http-input-source" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2- [...]
+<p>You can set the following property to specify permissible protocols for
+the <a href="/docs/0.21.0/ingestion/native-batch.html#http-input-source">HTTP input source</a> and the <a href="/docs/0.21.0/ingestion/native-batch.html#httpfirehose">HTTP firehose</a>.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.ingestion.http.allowedProtocols</code></td><td>List of protocols</td><td>Allowed protocols for the HTTP input source and HTTP firehose.</td><td>[&quot;http&quot;, &quot;https&quot;]</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="external-data-access-security-configuration"></a><a href="#external-data-access-security-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h [...]
 <h4><a class="anchor" aria-hidden="true" id="jdbc-connections-to-external-databases"></a><a href="#jdbc-connections-to-external-databases" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1. [...]
 <p>You can use the following properties to specify permissible JDBC options for:</p>
 <ul>
-<li><a href="/docs/latest/ingestion/native-batch.html#sql-input-source">SQL input source</a></li>
-<li><a href="/docs/latest/ingestion/native-batch.html#sqlfirehose">SQL firehose</a>,</li>
-<li><a href="/docs/latest/development/extensions-core/lookups-cached-global.html#jdbc-lookup">globally cached JDBC lookups</a></li>
-<li><a href="/docs/latest/development/extensions-core/druid-lookups.html#data-fetcher-layer">JDBC Data Fetcher for per-lookup caching</a>.</li>
+<li><a href="/docs/0.21.0/ingestion/native-batch.html#sql-input-source">SQL input source</a></li>
+<li><a href="/docs/0.21.0/ingestion/native-batch.html#sqlfirehose">SQL firehose</a>,</li>
+<li><a href="/docs/0.21.0/development/extensions-core/lookups-cached-global.html#jdbc-lookup">globally cached JDBC lookups</a></li>
+<li><a href="/docs/0.21.0/development/extensions-core/druid-lookups.html#data-fetcher-layer">JDBC Data Fetcher for per-lookup caching</a>.</li>
 </ul>
 <p>These properties do not apply to metadata storage connections.</p>
 <table>
@@ -639,7 +662,7 @@ The below table shows some important configurations for S3. See <a href="/docs/l
 <tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th></tr>
 </thead>
 <tbody>
-<tr><td><code>druid.access.jdbc.enforceAllowedProperties</code></td><td>Boolean</td><td>When true, Druid applies <code>druid.access.jdbc.allowedProperties</code> to JDBC connections starting with <code>jdbc:postgresql:</code> or <code>jdbc:mysql:</code>. When false, Druid allows any kind of JDBC connections without JDBC property validation. This config is deprecated and will be removed in a future release.</td><td>false</td></tr>
+<tr><td><code>druid.access.jdbc.enforceAllowedProperties</code></td><td>Boolean</td><td>When true, Druid applies <code>druid.access.jdbc.allowedProperties</code> to JDBC connections starting with <code>jdbc:postgresql:</code> or <code>jdbc:mysql:</code>. When false, Druid allows any kind of JDBC connections without JDBC property validation. This config is for backward compatibility especially during upgrades since enforcing allow list can break existing ingestion jobs or lookups based on [...]
 <tr><td><code>druid.access.jdbc.allowedProperties</code></td><td>List of JDBC properties</td><td>Defines a list of allowed JDBC properties. Druid always enforces the list for all JDBC connections starting with <code>jdbc:postgresql:</code> or <code>jdbc:mysql:</code> if <code>druid.access.jdbc.enforceAllowedProperties</code> is set to true.<br/><br/>This option is tested against MySQL connector 5.1.48 and PostgreSQL connector 42.2.14. Other connector versions might not work.</td><td>[&qu [...]
 <tr><td><code>druid.access.jdbc.allowUnknownJdbcUrlFormat</code></td><td>Boolean</td><td>When false, Druid only accepts JDBC connections starting with <code>jdbc:postgresql:</code> or <code>jdbc:mysql:</code>. When true, Druid allows JDBC connections to any kind of database, but only enforces <code>druid.access.jdbc.allowedProperties</code> for PostgreSQL and MySQL.</td><td>true</td></tr>
 </tbody>
@@ -724,7 +747,7 @@ Caution: Automatic log file deletion typically works based on log file modificat
 </tbody>
 </table>
 <h3><a class="anchor" aria-hidden="true" id="overlord-discovery"></a><a href="#overlord-discovery" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22- [...]
-<p>This config is used to find the <a href="/docs/latest/design/overlord.html">Overlord</a> using Curator service discovery. Only required if you are actually running an Overlord.</p>
+<p>This config is used to find the <a href="/docs/0.21.0/design/overlord.html">Overlord</a> using Curator service discovery. Only required if you are actually running an Overlord.</p>
 <table>
 <thead>
 <tr><th>Property</th><th>Description</th><th>Default</th></tr>
@@ -734,7 +757,7 @@ Caution: Automatic log file deletion typically works based on log file modificat
 </tbody>
 </table>
 <h3><a class="anchor" aria-hidden="true" id="coordinator-discovery"></a><a href="#coordinator-discovery" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2 [...]
-<p>This config is used to find the <a href="/docs/latest/design/coordinator.html">Coordinator</a> using Curator service discovery. This config is used by the realtime indexing processes to get information about the segments loaded in the cluster.</p>
+<p>This config is used to find the <a href="/docs/0.21.0/design/coordinator.html">Coordinator</a> using Curator service discovery. This config is used by the realtime indexing processes to get information about the segments loaded in the cluster.</p>
 <table>
 <thead>
 <tr><th>Property</th><th>Description</th><th>Default</th></tr>
@@ -770,7 +793,7 @@ the following properties.</p>
 </tbody>
 </table>
 <blockquote>
-<p>JavaScript-based functionality is disabled by default. Please refer to the Druid <a href="/docs/latest/development/javascript.html">JavaScript programming guide</a> for guidelines about using Druid's JavaScript functionality, including instructions on how to enable it.</p>
+<p>JavaScript-based functionality is disabled by default. Please refer to the Druid <a href="/docs/0.21.0/development/javascript.html">JavaScript programming guide</a> for guidelines about using Druid's JavaScript functionality, including instructions on how to enable it.</p>
 </blockquote>
 <h3><a class="anchor" aria-hidden="true" id="double-column-storage"></a><a href="#double-column-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2 [...]
 <p>Prior to version 0.13.0, Druid's storage layer used a 32-bit float representation to store columns created by the
@@ -798,7 +821,7 @@ Support for 64-bit floating point columns was released in Druid 0.11.0, so if yo
 <tr><td><code>druid.generic.useDefaultValueForNull</code></td><td>When set to <code>true</code>, <code>null</code> values will be stored as <code>''</code> for string columns and <code>0</code> for numeric columns. Set to <code>false</code> to store and query data in SQL compatible mode.</td><td><code>true</code></td></tr>
 </tbody>
 </table>
-<p>This mode does have a storage size and query performance cost, see <a href="/docs/latest/design/segments.html#sql-compatible-null-handling">segment documentation</a> for more details.</p>
+<p>This mode does have a storage size and query performance cost, see <a href="/docs/0.21.0/design/segments.html#sql-compatible-null-handling">segment documentation</a> for more details.</p>
 <h3><a class="anchor" aria-hidden="true" id="http-client"></a><a href="#http-client" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42 [...]
 <p>All Druid components can communicate with each other over HTTP.</p>
 <table>
@@ -814,9 +837,9 @@ Support for 64-bit floating point columns was released in Druid 0.11.0, so if yo
 </tbody>
 </table>
 <h2><a class="anchor" aria-hidden="true" id="master-server"></a><a href="#master-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
-<p>This section contains the configuration options for the processes that reside on Master servers (Coordinators and Overlords) in the suggested <a href="../design/processes.html#server-types">three-server configuration</a>.</p>
+<p>This section contains the configuration options for the processes that reside on Master servers (Coordinators and Overlords) in the suggested <a href="/docs/0.21.0/design/processes.html#server-types">three-server configuration</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="coordinator"></a><a href="#coordinator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42 [...]
-<p>For general Coordinator Process information, see <a href="/docs/latest/design/coordinator.html">here</a>.</p>
+<p>For general Coordinator Process information, see <a href="/docs/0.21.0/design/coordinator.html">here</a>.</p>
 <h4><a class="anchor" aria-hidden="true" id="static-configuration"></a><a href="#static-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1 [...]
 <p>These Coordinator static configurations can be defined in the <code>coordinator/runtime.properties</code> file.</p>
 <h5><a class="anchor" aria-hidden="true" id="coordinator-process-config"></a><a href="#coordinator-process-config" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H [...]
@@ -828,7 +851,7 @@ Support for 64-bit floating point columns was released in Druid 0.11.0, so if yo
 <tr><td><code>druid.host</code></td><td>The host for the current process. This is used to advertise the current processes location as reachable from another process and should generally be specified such that <code>http://${druid.host}/</code> could actually talk to this process</td><td>InetAddress.getLocalHost().getCanonicalHostName()</td></tr>
 <tr><td><code>druid.bindOnHost</code></td><td>Indicating whether the process's internal jetty server bind on <code>druid.host</code>. Default is false, which means binding to all interfaces.</td><td>false</td></tr>
 <tr><td><code>druid.plaintextPort</code></td><td>This is the port to actually listen on; unless port mapping is used, this will be the same port as is on <code>druid.host</code></td><td>8081</td></tr>
-<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/latest/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>8281</td></tr>
+<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/0.21.0/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>8281</td></tr>
 <tr><td><code>druid.service</code></td><td>The name of the service. This is used as a dimension when emitting metrics and alerts to differentiate between the various services</td><td>druid/coordinator</td></tr>
 </tbody>
 </table>
@@ -842,7 +865,7 @@ Support for 64-bit floating point columns was released in Druid 0.11.0, so if yo
 <tr><td><code>druid.coordinator.period.indexingPeriod</code></td><td>How often to send compact/merge/conversion tasks to the indexing service. It's recommended to be longer than <code>druid.manager.segments.pollDuration</code></td><td>PT1800S (30 mins)</td></tr>
 <tr><td><code>druid.coordinator.startDelay</code></td><td>The operation of the Coordinator works on the assumption that it has an up-to-date view of the state of the world when it runs, the current ZK interaction code, however, is written in a way that doesn’t allow the Coordinator to know for a fact that it’s done loading the current state of the world. This delay is a hack to give it enough time to believe that it has all the data.</td><td>PT300S</td></tr>
 <tr><td><code>druid.coordinator.load.timeout</code></td><td>The timeout duration for when the Coordinator assigns a segment to a Historical process.</td><td>PT15M</td></tr>
-<tr><td><code>druid.coordinator.kill.pendingSegments.on</code></td><td>Boolean flag for whether or not the Coordinator clean up old entries in the <code>pendingSegments</code> table of metadata store. If set to true, Coordinator will check the created time of most recently complete task. If it doesn't exist, it finds the created time of the earliest running/pending/waiting tasks. Once the created time is found, then for all dataSources not in the <code>killPendingSegmentsSkipList</code>  [...]
+<tr><td><code>druid.coordinator.kill.pendingSegments.on</code></td><td>Boolean flag for whether or not the Coordinator clean up old entries in the <code>pendingSegments</code> table of metadata store. If set to true, Coordinator will check the created time of most recently complete task. If it doesn't exist, it finds the created time of the earliest running/pending/waiting tasks. Once the created time is found, then for all dataSources not in the <code>killPendingSegmentsSkipList</code>  [...]
 <tr><td><code>druid.coordinator.kill.on</code></td><td>Boolean flag for whether or not the Coordinator should submit kill task for unused segments, that is, hard delete them from metadata store and deep storage. If set to true, then for all whitelisted dataSources (or optionally all), Coordinator will submit tasks periodically based on <code>period</code> specified. These kill tasks will delete all unused segments except for the last <code>durationToRetain</code> period. Whitelist or All [...]
 <tr><td><code>druid.coordinator.kill.period</code></td><td>How often to send kill tasks to the indexing service. Value must be greater than <code>druid.coordinator.period.indexingPeriod</code>. Only applies if kill is turned on.</td><td>P1D (1 Day)</td></tr>
 <tr><td><code>druid.coordinator.kill.durationToRetain</code></td><td>Do not kill unused segments in last <code>durationToRetain</code>, must be greater or equal to 0. Only applies and MUST be specified if kill is turned on. Note that default value is invalid.</td><td>PT-1S (-1 seconds)</td></tr>
@@ -888,7 +911,7 @@ Support for 64-bit floating point columns was released in Druid 0.11.0, so if yo
 </tbody>
 </table>
 <h4><a class="anchor" aria-hidden="true" id="dynamic-configuration"></a><a href="#dynamic-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2 [...]
-<p>The Coordinator has dynamic configuration to change certain behavior on the fly. The Coordinator uses a JSON spec object from the Druid <a href="/docs/latest/dependencies/metadata-storage.html">metadata storage</a> config table. This object is detailed below:</p>
+<p>The Coordinator has dynamic configuration to change certain behavior on the fly. The Coordinator uses a JSON spec object from the Druid <a href="/docs/0.21.0/dependencies/metadata-storage.html">metadata storage</a> config table. This object is detailed below:</p>
 <p>It is recommended that you use the Coordinator Console to configure these parameters. However, if you need to do it via HTTP, the JSON object can be submitted to the Coordinator via a POST request at:</p>
 <pre><code class="hljs">http:<span class="hljs-regexp">//</span>&lt;COORDINATOR_IP&gt;:&lt;PORT&gt;<span class="hljs-regexp">/druid/</span>coordinator<span class="hljs-regexp">/v1/</span>config
 </code></pre>
@@ -908,6 +931,7 @@ Support for 64-bit floating point columns was released in Druid 0.11.0, so if yo
   <span class="hljs-attr">"mergeBytesLimit"</span>: <span class="hljs-number">100000000</span>,
   <span class="hljs-attr">"mergeSegmentsLimit"</span> : <span class="hljs-number">1000</span>,
   <span class="hljs-attr">"maxSegmentsToMove"</span>: <span class="hljs-number">5</span>,
+  <span class="hljs-attr">"percentOfSegmentsToConsiderPerMove"</span>: <span class="hljs-number">100</span>,
   <span class="hljs-attr">"replicantLifetime"</span>: <span class="hljs-number">15</span>,
   <span class="hljs-attr">"replicationThrottleLimit"</span>: <span class="hljs-number">10</span>,
   <span class="hljs-attr">"emitBalancingStats"</span>: <span class="hljs-literal">false</span>,
@@ -925,8 +949,9 @@ Support for 64-bit floating point columns was released in Druid 0.11.0, so if yo
 <tbody>
 <tr><td><code>millisToWaitBeforeDeleting</code></td><td>How long does the Coordinator need to be a leader before it can start marking overshadowed segments as unused in metadata storage.</td><td>900000 (15 mins)</td></tr>
 <tr><td><code>mergeBytesLimit</code></td><td>The maximum total uncompressed size in bytes of segments to merge.</td><td>524288000L</td></tr>
-<tr><td><code>mergeSegmentsLimit</code></td><td>The maximum number of segments that can be in a single <a href="/docs/latest/ingestion/tasks.html">append task</a>.</td><td>100</td></tr>
+<tr><td><code>mergeSegmentsLimit</code></td><td>The maximum number of segments that can be in a single <a href="/docs/0.21.0/ingestion/tasks.html">append task</a>.</td><td>100</td></tr>
 <tr><td><code>maxSegmentsToMove</code></td><td>The maximum number of segments that can be moved at any given time.</td><td>5</td></tr>
+<tr><td><code>percentOfSegmentsToConsiderPerMove</code></td><td>The percentage of the total number of segments in the cluster that are considered every time a segment needs to be selected for a move. Druid orders servers by available capacity ascending (the least available capacity first) and then iterates over the servers. For each server, Druid iterates over the segments on the server, considering them for moving. The default config of 100% means that every segment on every server is a [...]
 <tr><td><code>replicantLifetime</code></td><td>The maximum number of Coordinator runs for a segment to be replicated before we start alerting.</td><td>15</td></tr>
 <tr><td><code>replicationThrottleLimit</code></td><td>The maximum number of segments that can be replicated at one time.</td><td>10</td></tr>
 <tr><td><code>balancerComputeThreads</code></td><td>Thread pool size for computing moving cost of segments in segment balancing. Consider increasing this if you have a lot of segments and moving segments starts to get stuck.</td><td>1</td></tr>
@@ -948,7 +973,7 @@ Support for 64-bit floating point columns was released in Druid 0.11.0, so if yo
 <pre><code class="hljs">http://<span class="hljs-symbol">&lt;COORDINATOR_IP&gt;</span>:<span class="hljs-symbol">&lt;PORT&gt;</span>/druid/coordinator/v1/config/<span class="hljs-keyword">history</span>?<span class="hljs-built_in">count</span>=<span class="hljs-symbol">&lt;n&gt;</span>
 </code></pre>
 <h5><a class="anchor" aria-hidden="true" id="lookups-dynamic-configuration"></a><a href="#lookups-dynamic-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12  [...]
-<p>These configuration options control the behavior of the Lookup dynamic configuration described in the <a href="/docs/latest/querying/lookups.html">lookups page</a></p>
+<p>These configuration options control the behavior of the Lookup dynamic configuration described in the <a href="/docs/0.21.0/querying/lookups.html">lookups page</a></p>
 <table>
 <thead>
 <tr><th>Property</th><th>Description</th><th>Default</th></tr>
@@ -964,8 +989,8 @@ Support for 64-bit floating point columns was released in Druid 0.11.0, so if yo
 </table>
 <h5><a class="anchor" aria-hidden="true" id="compaction-dynamic-configuration"></a><a href="#compaction-dynamic-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13. [...]
 <p>Compaction configurations can also be set or updated dynamically using
-<a href="../operations/api-reference.html#compaction-configuration">Coordinator's API</a> without restarting Coordinators.</p>
-<p>For details about segment compaction, please check <a href="/docs/latest/operations/segment-optimization.html">Segment Size Optimization</a>.</p>
+<a href="/docs/0.21.0/operations/api-reference.html#compaction-configuration">Coordinator's API</a> without restarting Coordinators.</p>
+<p>For details about segment compaction, please check <a href="/docs/0.21.0/operations/segment-optimization.html">Segment Size Optimization</a>.</p>
 <p>A description of the compaction config is:</p>
 <table>
 <thead>
@@ -973,12 +998,12 @@ Support for 64-bit floating point columns was released in Druid 0.11.0, so if yo
 </thead>
 <tbody>
 <tr><td><code>dataSource</code></td><td>dataSource name to be compacted.</td><td>yes</td></tr>
-<tr><td><code>taskPriority</code></td><td><a href="../ingestion/tasks.html#priority">Priority</a> of compaction task.</td><td>no (default = 25)</td></tr>
+<tr><td><code>taskPriority</code></td><td><a href="/docs/0.21.0/ingestion/tasks.html#priority">Priority</a> of compaction task.</td><td>no (default = 25)</td></tr>
 <tr><td><code>inputSegmentSizeBytes</code></td><td>Maximum number of total segment bytes processed per compaction task. Since a time chunk must be processed in its entirety, if the segments for a particular time chunk have a total size in bytes greater than this parameter, compaction will not run for that time chunk. Because each compaction task runs with a single thread, setting this value too far above 1–2GB will result in compaction tasks taking an excessive amount of time.</td><td>no [...]
 <tr><td><code>maxRowsPerSegment</code></td><td>Max number of rows per segment after compaction.</td><td>no</td></tr>
 <tr><td><code>skipOffsetFromLatest</code></td><td>The offset for searching segments to be compacted. Strongly recommended to set for realtime dataSources.</td><td>no (default = &quot;P1D&quot;)</td></tr>
 <tr><td><code>tuningConfig</code></td><td>Tuning config for compaction tasks. See below <a href="#compaction-tuningconfig">Compaction Task TuningConfig</a>.</td><td>no</td></tr>
-<tr><td><code>taskContext</code></td><td><a href="../ingestion/tasks.html#context">Task context</a> for compaction tasks.</td><td>no</td></tr>
+<tr><td><code>taskContext</code></td><td><a href="/docs/0.21.0/ingestion/tasks.html#context">Task context</a> for compaction tasks.</td><td>no</td></tr>
 </tbody>
 </table>
 <p>An example of compaction config is:</p>
@@ -993,7 +1018,7 @@ If this is the case, the coordinator's automatic compaction might get stuck beca
 This kind of problem may happen especially in Kafka/Kinesis indexing systems which allow late data arrival.
 If you see this problem, it's recommended to set <code>skipOffsetFromLatest</code> to some large enough value to avoid such conflicts between compaction tasks and realtime tasks.</p>
 <h6><a class="anchor" aria-hidden="true" id="compaction-tuningconfig"></a><a href="#compaction-tuningconfig" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 [...]
-<p>Auto compaction supports a subset of the <a href="/docs/latest/ingestion/native-batch.html#tuningconfig">tuningConfig for Parallel task</a>.
+<p>Auto compaction supports a subset of the <a href="/docs/0.21.0/ingestion/native-batch.html#tuningconfig">tuningConfig for Parallel task</a>.
 The below is a list of the supported configurations for auto compaction.</p>
 <table>
 <thead>
@@ -1003,14 +1028,14 @@ The below is a list of the supported configurations for auto compaction.</p>
 <tr><td>type</td><td>The task type, this should always be <code>index_parallel</code>.</td><td>yes</td></tr>
 <tr><td><code>maxRowsInMemory</code></td><td>Used in determining when intermediate persists to disk should occur. Normally user does not need to set this, but depending on the nature of data, if rows are short in terms of bytes, user may not want to store a million rows in memory and this value should be set.</td><td>no (default = 1000000)</td></tr>
 <tr><td><code>maxBytesInMemory</code></td><td>Used in determining when intermediate persists to disk should occur. Normally this is computed internally and user does not need to set it. This value represents number of bytes to aggregate in heap memory before persisting. This is based on a rough estimate of memory usage and not actual usage. The maximum heap memory usage for indexing is <code>maxBytesInMemory</code> * (2 + <code>maxPendingPersists</code>)</td><td>no (default = 1/6 of max  [...]
-<tr><td><code>splitHintSpec</code></td><td>Used to give a hint to control the amount of data that each first phase task reads. This hint could be ignored depending on the implementation of the input source. See <a href="/docs/latest/ingestion/native-batch.html#split-hint-spec">Split hint spec</a> for more details.</td><td>no (default = size-based split hint spec)</td></tr>
-<tr><td><code>partitionsSpec</code></td><td>Defines how to partition data in each time chunk, see <a href="/docs/latest/ingestion/native-batch.html#partitionsspec"><code>PartitionsSpec</code></a></td><td>no (default = <code>dynamic</code>)</td></tr>
-<tr><td><code>indexSpec</code></td><td>Defines segment storage format options to be used at indexing time, see <a href="/docs/latest/ingestion/index.html#indexspec">IndexSpec</a></td><td>no</td></tr>
-<tr><td><code>indexSpecForIntermediatePersists</code></td><td>Defines segment storage format options to be used at indexing time for intermediate persisted temporary segments. this can be used to disable dimension/metric compression on intermediate segments to reduce memory required for final merging. however, disabling compression on intermediate segments might increase page cache use while they are used before getting merged into final segment published, see <a href="/docs/latest/inges [...]
+<tr><td><code>splitHintSpec</code></td><td>Used to give a hint to control the amount of data that each first phase task reads. This hint could be ignored depending on the implementation of the input source. See <a href="/docs/0.21.0/ingestion/native-batch.html#split-hint-spec">Split hint spec</a> for more details.</td><td>no (default = size-based split hint spec)</td></tr>
+<tr><td><code>partitionsSpec</code></td><td>Defines how to partition data in each time chunk, see <a href="/docs/0.21.0/ingestion/native-batch.html#partitionsspec"><code>PartitionsSpec</code></a></td><td>no (default = <code>dynamic</code>)</td></tr>
+<tr><td><code>indexSpec</code></td><td>Defines segment storage format options to be used at indexing time, see <a href="/docs/0.21.0/ingestion/index.html#indexspec">IndexSpec</a></td><td>no</td></tr>
+<tr><td><code>indexSpecForIntermediatePersists</code></td><td>Defines segment storage format options to be used at indexing time for intermediate persisted temporary segments. this can be used to disable dimension/metric compression on intermediate segments to reduce memory required for final merging. however, disabling compression on intermediate segments might increase page cache use while they are used before getting merged into final segment published, see <a href="/docs/0.21.0/inges [...]
 <tr><td><code>maxPendingPersists</code></td><td>Maximum number of persists that can be pending but not started. If this limit would be exceeded by a new intermediate persist, ingestion will block until the currently-running persist finishes. Maximum heap memory usage for indexing scales with <code>maxRowsInMemory</code> * (2 + <code>maxPendingPersists</code>).</td><td>no (default = 0, meaning one persist can be running concurrently with ingestion, and none can be queued up)</td></tr>
 <tr><td><code>pushTimeout</code></td><td>Milliseconds to wait for pushing segments. It must be &gt;= 0, where 0 means to wait forever.</td><td>no (default = 0)</td></tr>
-<tr><td><code>segmentWriteOutMediumFactory</code></td><td>Segment write-out medium to use when creating segments. See <a href="/docs/latest/ingestion/native-batch.html#segmentwriteoutmediumfactory">SegmentWriteOutMediumFactory</a>.</td><td>no (default is the value from <code>druid.peon.defaultSegmentWriteOutMediumFactory.type</code> is used)</td></tr>
-<tr><td><code>maxNumConcurrentSubTasks</code></td><td>Maximum number of worker tasks which can be run in parallel at the same time. The supervisor task would spawn worker tasks up to <code>maxNumConcurrentSubTasks</code> regardless of the current available task slots. If this value is set to 1, the supervisor task processes data ingestion on its own instead of spawning worker tasks. If this value is set to too large, too many worker tasks can be created which might block other ingestion. [...]
+<tr><td><code>segmentWriteOutMediumFactory</code></td><td>Segment write-out medium to use when creating segments. See <a href="/docs/0.21.0/ingestion/native-batch.html#segmentwriteoutmediumfactory">SegmentWriteOutMediumFactory</a>.</td><td>no (default is the value from <code>druid.peon.defaultSegmentWriteOutMediumFactory.type</code> is used)</td></tr>
+<tr><td><code>maxNumConcurrentSubTasks</code></td><td>Maximum number of worker tasks which can be run in parallel at the same time. The supervisor task would spawn worker tasks up to <code>maxNumConcurrentSubTasks</code> regardless of the current available task slots. If this value is set to 1, the supervisor task processes data ingestion on its own instead of spawning worker tasks. If this value is set to too large, too many worker tasks can be created which might block other ingestion. [...]
 <tr><td><code>maxRetry</code></td><td>Maximum number of retries on task failures.</td><td>no (default = 3)</td></tr>
 <tr><td><code>maxNumSegmentsToMerge</code></td><td>Max limit for the number of segments that a single task can merge at the same time in the second phase. Used only with <code>hashed</code> or <code>single_dim</code> partitionsSpec.</td><td>no (default = 100)</td></tr>
 <tr><td><code>totalNumMergeTasks</code></td><td>Total number of tasks to merge segments in the merge phase when <code>partitionsSpec</code> is set to <code>hashed</code> or <code>single_dim</code>.</td><td>no (default = 10)</td></tr>
@@ -1020,7 +1045,7 @@ The below is a list of the supported configurations for auto compaction.</p>
 </tbody>
 </table>
 <h3><a class="anchor" aria-hidden="true" id="overlord"></a><a href="#overlord" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64  [...]
-<p>For general Overlord Process information, see <a href="/docs/latest/design/overlord.html">here</a>.</p>
+<p>For general Overlord Process information, see <a href="/docs/0.21.0/design/overlord.html">here</a>.</p>
 <h4><a class="anchor" aria-hidden="true" id="overlord-static-configuration"></a><a href="#overlord-static-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12  [...]
 <p>These Overlord static configurations can be defined in the <code>overlord/runtime.properties</code> file.</p>
 <h5><a class="anchor" aria-hidden="true" id="overlord-process-configs"></a><a href="#overlord-process-configs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-. [...]
@@ -1032,7 +1057,7 @@ The below is a list of the supported configurations for auto compaction.</p>
 <tr><td><code>druid.host</code></td><td>The host for the current process. This is used to advertise the current processes location as reachable from another process and should generally be specified such that <code>http://${druid.host}/</code> could actually talk to this process</td><td>InetAddress.getLocalHost().getCanonicalHostName()</td></tr>
 <tr><td><code>druid.bindOnHost</code></td><td>Indicating whether the process's internal jetty server bind on <code>druid.host</code>. Default is false, which means binding to all interfaces.</td><td>false</td></tr>
 <tr><td><code>druid.plaintextPort</code></td><td>This is the port to actually listen on; unless port mapping is used, this will be the same port as is on <code>druid.host</code></td><td>8090</td></tr>
-<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/latest/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>8290</td></tr>
+<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/0.21.0/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>8290</td></tr>
 <tr><td><code>druid.service</code></td><td>The name of the service. This is used as a dimension when emitting metrics and alerts to differentiate between the various services</td><td>druid/overlord</td></tr>
 </tbody>
 </table>
@@ -1045,14 +1070,14 @@ The below is a list of the supported configurations for auto compaction.</p>
 <tr><td><code>druid.indexer.runner.type</code></td><td>Choices &quot;local&quot; or &quot;remote&quot;. Indicates whether tasks should be run locally or in a distributed environment. Experimental task runner &quot;httpRemote&quot; is also available which is same as &quot;remote&quot; but uses HTTP to interact with Middle Managers instead of Zookeeper.</td><td>local</td></tr>
 <tr><td><code>druid.indexer.storage.type</code></td><td>Choices are &quot;local&quot; or &quot;metadata&quot;. Indicates whether incoming tasks should be stored locally (in heap) or in metadata storage. Storing incoming tasks in metadata storage allows for tasks to be resumed if the Overlord should fail.</td><td>local</td></tr>
 <tr><td><code>druid.indexer.storage.recentlyFinishedThreshold</code></td><td>A duration of time to store task results.</td><td>PT24H</td></tr>
-<tr><td><code>druid.indexer.tasklock.forceTimeChunkLock</code></td><td><em><strong>Setting this to false is still experimental</strong></em><br/> If set, all tasks are enforced to use time chunk lock. If not set, each task automatically chooses a lock type to use. This configuration can be overwritten by setting <code>forceTimeChunkLock</code> in the <a href="/docs/latest/ingestion/tasks.html#context">task context</a>. See <a href="/docs/latest/ingestion/tasks.html#context">Task Locking  [...]
+<tr><td><code>druid.indexer.tasklock.forceTimeChunkLock</code></td><td><em><strong>Setting this to false is still experimental</strong></em><br/> If set, all tasks are enforced to use time chunk lock. If not set, each task automatically chooses a lock type to use. This configuration can be overwritten by setting <code>forceTimeChunkLock</code> in the <a href="/docs/0.21.0/ingestion/tasks.html#context">task context</a>. See <a href="/docs/0.21.0/ingestion/tasks.html#context">Task Locking  [...]
 <tr><td><code>druid.indexer.queue.maxSize</code></td><td>Maximum number of active tasks at one time.</td><td>Integer.MAX_VALUE</td></tr>
 <tr><td><code>druid.indexer.queue.startDelay</code></td><td>Sleep this long before starting Overlord queue management. This can be useful to give a cluster time to re-orient itself after e.g. a widespread network issue.</td><td>PT1M</td></tr>
 <tr><td><code>druid.indexer.queue.restartDelay</code></td><td>Sleep this long when Overlord queue management throws an exception before trying again.</td><td>PT30S</td></tr>
 <tr><td><code>druid.indexer.queue.storageSyncRate</code></td><td>Sync Overlord state this often with an underlying task persistence mechanism.</td><td>PT1M</td></tr>
 </tbody>
 </table>
-<p>The following configs only apply if the Overlord is running in remote mode. For a description of local vs. remote mode, please see (../design/overlord.html).</p>
+<p>The following configs only apply if the Overlord is running in remote mode. For a description of local vs. remote mode, see <a href="/docs/0.21.0/design/overlord.html">Overlord Process</a>.</p>
 <table>
 <thead>
 <tr><th>Property</th><th>Description</th><th>Default</th></tr>
@@ -1061,7 +1086,7 @@ The below is a list of the supported configurations for auto compaction.</p>
 <tr><td><code>druid.indexer.runner.taskAssignmentTimeout</code></td><td>How long to wait after a task as been assigned to a MiddleManager before throwing an error.</td><td>PT5M</td></tr>
 <tr><td><code>druid.indexer.runner.minWorkerVersion</code></td><td>The minimum MiddleManager version to send tasks to.</td><td>&quot;0&quot;</td></tr>
 <tr><td><code>druid.indexer.runner.compressZnodes</code></td><td>Indicates whether or not the Overlord should expect MiddleManagers to compress Znodes.</td><td>true</td></tr>
-<tr><td><code>druid.indexer.runner.maxZnodeBytes</code></td><td>The maximum size Znode in bytes that can be created in Zookeeper. Human-readable format is supported, see <a href="/docs/latest/configuration/human-readable-byte.html">here</a>.</td><td>512 KiB</td></tr>
+<tr><td><code>druid.indexer.runner.maxZnodeBytes</code></td><td>The maximum size Znode in bytes that can be created in Zookeeper, should be in the range of [10KiB, 2GiB). <a href="/docs/0.21.0/configuration/human-readable-byte.html">Human-readable format</a> is supported.</td><td>512 KiB</td></tr>
 <tr><td><code>druid.indexer.runner.taskCleanupTimeout</code></td><td>How long to wait before failing a task after a MiddleManager is disconnected from Zookeeper.</td><td>PT15M</td></tr>
 <tr><td><code>druid.indexer.runner.taskShutdownLinkTimeout</code></td><td>How long to wait on a shutdown request to a MiddleManager before timing out</td><td>PT1M</td></tr>
 <tr><td><code>druid.indexer.runner.pendingTasksRunnerNumThreads</code></td><td>Number of threads to allocate pending-tasks to workers, must be at least 1.</td><td>1</td></tr>
@@ -1267,7 +1292,7 @@ its better to write a druid extension module with extending current worker selec
 }
 </code></pre>
 <blockquote>
-<p>JavaScript-based functionality is disabled by default. Please refer to the Druid <a href="/docs/latest/development/javascript.html">JavaScript programming guide</a> for guidelines about using Druid's JavaScript functionality, including instructions on how to enable it.</p>
+<p>JavaScript-based functionality is disabled by default. Please refer to the Druid <a href="/docs/0.21.0/development/javascript.html">JavaScript programming guide</a> for guidelines about using Druid's JavaScript functionality, including instructions on how to enable it.</p>
 </blockquote>
 <h6><a class="anchor" aria-hidden="true" id="affinity"></a><a href="#affinity" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64  [...]
 <p>Affinity configs can be provided to the <em>equalDistribution</em> and <em>fillCapacity</em> strategies using the &quot;affinityConfig&quot;
@@ -1318,10 +1343,10 @@ field. If not provided, the default is to not use it at all.</p>
 <tr><td><code>userData</code></td><td>A JSON object that describes how to configure new nodes. If you have set druid.indexer.autoscale.workerVersion, this must have a versionReplacementString. Otherwise, a versionReplacementString is not necessary.</td><td>none; optional</td></tr>
 </tbody>
 </table>
-<p>For GCE's properties, please refer to the <a href="/docs/latest/development/extensions-contrib/gce-extensions.html">gce-extensions</a>.</p>
+<p>For GCE's properties, please refer to the <a href="/docs/0.21.0/development/extensions-contrib/gce-extensions.html">gce-extensions</a>.</p>
 <h2><a class="anchor" aria-hidden="true" id="data-server"></a><a href="#data-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42 [...]
-<p>This section contains the configuration options for the processes that reside on Data servers (MiddleManagers/Peons and Historicals) in the suggested <a href="../design/processes.html#server-types">three-server configuration</a>.</p>
-<p>Configuration options for the experimental <a href="/docs/latest/design/indexer.html">Indexer process</a> are also provided here.</p>
+<p>This section contains the configuration options for the processes that reside on Data servers (MiddleManagers/Peons and Historicals) in the suggested <a href="/docs/0.21.0/design/processes.html#server-types">three-server configuration</a>.</p>
+<p>Configuration options for the experimental <a href="/docs/0.21.0/design/indexer.html">Indexer process</a> are also provided here.</p>
 <h3><a class="anchor" aria-hidden="true" id="middlemanager-and-peons"></a><a href="#middlemanager-and-peons" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 [...]
 <p>These MiddleManager and Peon configurations can be defined in the <code>middleManager/runtime.properties</code> file.</p>
 <h4><a class="anchor" aria-hidden="true" id="middlemanager-process-config"></a><a href="#middlemanager-process-config" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 [...]
@@ -1333,7 +1358,7 @@ field. If not provided, the default is to not use it at all.</p>
 <tr><td><code>druid.host</code></td><td>The host for the current process. This is used to advertise the current processes location as reachable from another process and should generally be specified such that <code>http://${druid.host}/</code> could actually talk to this process</td><td>InetAddress.getLocalHost().getCanonicalHostName()</td></tr>
 <tr><td><code>druid.bindOnHost</code></td><td>Indicating whether the process's internal jetty server bind on <code>druid.host</code>. Default is false, which means binding to all interfaces.</td><td>false</td></tr>
 <tr><td><code>druid.plaintextPort</code></td><td>This is the port to actually listen on; unless port mapping is used, this will be the same port as is on <code>druid.host</code></td><td>8091</td></tr>
-<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/latest/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>8291</td></tr>
+<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/0.21.0/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>8291</td></tr>
 <tr><td><code>druid.service</code></td><td>The name of the service. This is used as a dimension when emitting metrics and alerts to differentiate between the various services</td><td>druid/middlemanager</td></tr>
 </tbody>
 </table>
@@ -1350,14 +1375,14 @@ field. If not provided, the default is to not use it at all.</p>
 <tr><td><code>druid.indexer.runner.javaCommand</code></td><td>Command required to execute java.</td><td>java</td></tr>
 <tr><td><code>druid.indexer.runner.javaOpts</code></td><td><em>DEPRECATED</em> A string of -X Java options to pass to the peon's JVM. Quotable parameters or parameters with spaces are encouraged to use javaOptsArray</td><td>&quot;&quot;</td></tr>
 <tr><td><code>druid.indexer.runner.javaOptsArray</code></td><td>A JSON array of strings to be passed in as options to the peon's JVM. This is additive to javaOpts and is recommended for properly handling arguments which contain quotes or spaces like <code>[&quot;-XX:OnOutOfMemoryError=kill -9 %p&quot;]</code></td><td><code>[]</code></td></tr>
-<tr><td><code>druid.indexer.runner.maxZnodeBytes</code></td><td>The maximum size Znode in bytes that can be created in Zookeeper.</td><td>524288</td></tr>
+<tr><td><code>druid.indexer.runner.maxZnodeBytes</code></td><td>The maximum size Znode in bytes that can be created in Zookeeper, should be in the range of [10KiB, 2GiB). <a href="/docs/0.21.0/configuration/human-readable-byte.html">Human-readable format</a> is supported.</td><td>512KiB</td></tr>
 <tr><td><code>druid.indexer.runner.startPort</code></td><td>Starting port used for peon processes, should be greater than 1023 and less than 65536.</td><td>8100</td></tr>
 <tr><td><code>druid.indexer.runner.endPort</code></td><td>Ending port used for peon processes, should be greater than or equal to <code>druid.indexer.runner.startPort</code> and less than 65536.</td><td>65535</td></tr>
 <tr><td><code>druid.indexer.runner.ports</code></td><td>A JSON array of integers to specify ports that used for peon processes. If provided and non-empty, ports for peon processes will be chosen from these ports. And <code>druid.indexer.runner.startPort/druid.indexer.runner.endPort</code> will be completely ignored.</td><td><code>[]</code></td></tr>
 <tr><td><code>druid.worker.ip</code></td><td>The IP of the worker.</td><td>localhost</td></tr>
 <tr><td><code>druid.worker.version</code></td><td>Version identifier for the MiddleManager.</td><td>0</td></tr>
 <tr><td><code>druid.worker.capacity</code></td><td>Maximum number of tasks the MiddleManager can accept.</td><td>Number of CPUs on the machine - 1</td></tr>
-<tr><td><code>druid.worker.category</code></td><td>A string to name the category that the MiddleManager node belongs to.</td><td><code>__default_worker_category</code></td></tr>
+<tr><td><code>druid.worker.category</code></td><td>A string to name the category that the MiddleManager node belongs to.</td><td><code>_default_worker_category</code></td></tr>
 </tbody>
 </table>
 <h4><a class="anchor" aria-hidden="true" id="peon-processing"></a><a href="#peon-processing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5  [...]
@@ -1367,7 +1392,7 @@ field. If not provided, the default is to not use it at all.</p>
 <tr><th>Property</th><th>Description</th><th>Default</th></tr>
 </thead>
 <tbody>
-<tr><td><code>druid.processing.buffer.sizeBytes</code></td><td>This specifies a buffer size for the storage of intermediate results. The computation engine in both the Historical and Realtime processes will use a scratch buffer of this size to do all of their intermediate computations off-heap. Larger values allow for more aggregations in a single pass over the data while smaller values can require more passes depending on the query that is being executed. Human-readable format is suppor [...]
+<tr><td><code>druid.processing.buffer.sizeBytes</code></td><td>This specifies a buffer size (less than 2GiB) for the storage of intermediate results. The computation engine in both the Historical and Realtime processes will use a scratch buffer of this size to do all of their intermediate computations off-heap. Larger values allow for more aggregations in a single pass over the data while smaller values can require more passes depending on the query that is being executed. <a href="/docs [...]
 <tr><td><code>druid.processing.buffer.poolCacheMaxCount</code></td><td>processing buffer pool caches the buffers for later use, this is the maximum count cache will grow to. note that pool can create more buffers than it can cache if necessary.</td><td>Integer.MAX_VALUE</td></tr>
 <tr><td><code>druid.processing.formatString</code></td><td>Realtime and Historical processes use this format string to name their processing threads.</td><td>processing-%s</td></tr>
 <tr><td><code>druid.processing.numMergeBuffers</code></td><td>The number of direct memory buffers available for merging query results. The buffers are sized by <code>druid.processing.buffer.sizeBytes</code>. This property is effectively a concurrency limit for queries that require merging buffers. If you are using any queries that require merge buffers (currently, just groupBy v2) then you should have at least two of these.</td><td><code>max(2, druid.processing.numThreads / 4)</code></td></tr>
@@ -1445,7 +1470,7 @@ than the configured maximum <em>heap</em> size (<code>-Xmx</code>) for the same
 Using on-heap memory introduces garbage collection overhead and so is not recommended in most cases. This type of medium is
 most helpful for tasks run on external clusters where it may be difficult to allocate and work with direct memory
 effectively.</p>
-<p>For most types of tasks SegmentWriteOutMediumFactory could be configured per-task (see <a href="/docs/latest/ingestion/tasks.html">Tasks</a>
+<p>For most types of tasks SegmentWriteOutMediumFactory could be configured per-task (see <a href="/docs/0.21.0/ingestion/tasks.html">Tasks</a>
 page, &quot;TuningConfig&quot; section), but if it's not specified for a task, or it's not supported for a particular task type,
 then the value from the configuration below is used:</p>
 <table>
@@ -1466,7 +1491,7 @@ then the value from the configuration below is used:</p>
 <tr><td><code>druid.host</code></td><td>The host for the current process. This is used to advertise the current processes location as reachable from another process and should generally be specified such that <code>http://${druid.host}/</code> could actually talk to this process</td><td>InetAddress.getLocalHost().getCanonicalHostName()</td></tr>
 <tr><td><code>druid.bindOnHost</code></td><td>Indicating whether the process's internal jetty server bind on <code>druid.host</code>. Default is false, which means binding to all interfaces.</td><td>false</td></tr>
 <tr><td><code>druid.plaintextPort</code></td><td>This is the port to actually listen on; unless port mapping is used, this will be the same port as is on <code>druid.host</code></td><td>8091</td></tr>
-<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/latest/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>8283</td></tr>
+<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/0.21.0/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>8283</td></tr>
 <tr><td><code>druid.service</code></td><td>The name of the service. This is used as a dimension when emitting metrics and alerts to differentiate between the various services</td><td>druid/indexer</td></tr>
 </tbody>
 </table>
@@ -1498,14 +1523,14 @@ then the value from the configuration below is used:</p>
 <tr><th>Property</th><th>Description</th><th>Default</th></tr>
 </thead>
 <tbody>
-<tr><td><code>druid.server.http.numThreads</code></td><td>Number of threads for HTTP requests. Please see the <a href="../design/indexer.html#server-http-threads">Indexer Server HTTP threads</a> documentation for more details on how the Indexer uses this configuration.</td><td>max(10, (Number of cores * 17) / 16 + 2) + 30</td></tr>
+<tr><td><code>druid.server.http.numThreads</code></td><td>Number of threads for HTTP requests. Please see the <a href="/docs/0.21.0/design/indexer.html#server-http-threads">Indexer Server HTTP threads</a> documentation for more details on how the Indexer uses this configuration.</td><td>max(10, (Number of cores * 17) / 16 + 2) + 30</td></tr>
 <tr><td><code>druid.server.http.queueSize</code></td><td>Size of the worker queue used by Jetty server to temporarily store incoming client connections. If this value is set and a request is rejected by jetty because queue is full then client would observe request failure with TCP connection being closed immediately with a completely empty response from server.</td><td>Unbounded</td></tr>
 <tr><td><code>druid.server.http.maxIdleTime</code></td><td>The Jetty max idle time for a connection.</td><td>PT5M</td></tr>
 <tr><td><code>druid.server.http.enableRequestLimit</code></td><td>If enabled, no requests would be queued in jetty queue and &quot;HTTP 429 Too Many Requests&quot; error response would be sent.</td><td>false</td></tr>
 <tr><td><code>druid.server.http.defaultQueryTimeout</code></td><td>Query timeout in millis, beyond which unfinished queries will be cancelled</td><td>300000</td></tr>
-<tr><td><code>druid.server.http.gracefulShutdownTimeout</code></td><td>The maximum amount of time Jetty waits after receiving shutdown signal. After this timeout the threads will be forcefully shutdown. This allows any queries that are executing to complete.</td><td><code>PT0S</code> (do not wait)</td></tr>
+<tr><td><code>druid.server.http.gracefulShutdownTimeout</code></td><td>The maximum amount of time Jetty waits after receiving shutdown signal. After this timeout the threads will be forcefully shutdown. This allows any queries that are executing to complete(Only values greater than zero are valid).</td><td><code>PT30S</code></td></tr>
 <tr><td><code>druid.server.http.unannouncePropagationDelay</code></td><td>How long to wait for zookeeper unannouncements to propagate before shutting down Jetty. This is a minimum and <code>druid.server.http.gracefulShutdownTimeout</code> does not start counting down until after this period elapses.</td><td><code>PT0S</code> (do not wait)</td></tr>
-<tr><td><code>druid.server.http.maxQueryTimeout</code></td><td>Maximum allowed value (in milliseconds) for <code>timeout</code> parameter. See <a href="../querying/query-context.html">query-context</a> to know more about <code>timeout</code>. Query is rejected if the query context <code>timeout</code> is greater than this value.</td><td>Long.MAX_VALUE</td></tr>
+<tr><td><code>druid.server.http.maxQueryTimeout</code></td><td>Maximum allowed value (in milliseconds) for <code>timeout</code> parameter. See <a href="/docs/0.21.0/querying/query-context.html">query-context</a> to know more about <code>timeout</code>. Query is rejected if the query context <code>timeout</code> is greater than this value.</td><td>Long.MAX_VALUE</td></tr>
 <tr><td><code>druid.server.http.maxRequestHeaderSize</code></td><td>Maximum size of a request header in bytes. Larger headers consume more memory and can make a server more vulnerable to denial of service attacks.</td><td>8 * 1024</td></tr>
 <tr><td><code>druid.server.http.enableForwardedRequestCustomizer</code></td><td>If enabled, adds Jetty ForwardedRequestCustomizer which reads X-Forwarded-* request headers to manipulate servlet request object when Druid is used behind a proxy.</td><td>false</td></tr>
 <tr><td><code>druid.server.http.allowedHttpMethods</code></td><td>List of HTTP methods that should be allowed in addition to the ones required by Druid APIs. Druid APIs require GET, PUT, POST, and DELETE, which are always allowed. This option is not useful unless you have installed an extension that needs these additional HTTP methods or that adds functionality related to CORS. None of Druid's bundled extensions require these methods.</td><td>[]</td></tr>
@@ -1517,7 +1542,7 @@ then the value from the configuration below is used:</p>
 <tr><th>Property</th><th>Description</th><th>Default</th></tr>
 </thead>
 <tbody>
-<tr><td><code>druid.processing.buffer.sizeBytes</code></td><td>This specifies a buffer size for the storage of intermediate results. The computation engine in the Indexer processes will use a scratch buffer of this size to do all of their intermediate computations off-heap. Larger values allow for more aggregations in a single pass over the data while smaller values can require more passes depending on the query that is being executed.</td><td>auto (max 1GB)</td></tr>
+<tr><td><code>druid.processing.buffer.sizeBytes</code></td><td>This specifies a buffer size (less than 2GiB) for the storage of intermediate results. The computation engine in the Indexer processes will use a scratch buffer of this size to do all of their intermediate computations off-heap. Larger values allow for more aggregations in a single pass over the data while smaller values can require more passes depending on the query that is being executed. <a href="/docs/0.21.0/configuration [...]
 <tr><td><code>druid.processing.buffer.poolCacheMaxCount</code></td><td>processing buffer pool caches the buffers for later use, this is the maximum count cache will grow to. note that pool can create more buffers than it can cache if necessary.</td><td>Integer.MAX_VALUE</td></tr>
 <tr><td><code>druid.processing.formatString</code></td><td>Indexer processes use this format string to name their processing threads.</td><td>processing-%s</td></tr>
 <tr><td><code>druid.processing.numMergeBuffers</code></td><td>The number of direct memory buffers available for merging query results. The buffers are sized by <code>druid.processing.buffer.sizeBytes</code>. This property is effectively a concurrency limit for queries that require merging buffers. If you are using any queries that require merge buffers (currently, just groupBy v2) then you should have at least two of these.</td><td><code>max(2, druid.processing.numThreads / 4)</code></td></tr>
@@ -1549,7 +1574,7 @@ line.</p>
 <p>See <a href="#cache-configuration">cache configuration</a> for how to configure cache settings.</p>
 <p>Note that only local caches such as the <code>local</code>-type cache and <code>caffeine</code> cache are supported. If a remote cache such as <code>memcached</code> is used, it will be ignored.</p>
 <h3><a class="anchor" aria-hidden="true" id="historical"></a><a href="#historical" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1 [...]
-<p>For general Historical Process information, see <a href="/docs/latest/design/historical.html">here</a>.</p>
+<p>For general Historical Process information, see <a href="/docs/0.21.0/design/historical.html">here</a>.</p>
 <p>These Historical configurations can be defined in the <code>historical/runtime.properties</code> file.</p>
 <h4><a class="anchor" aria-hidden="true" id="historical-process-configuration"></a><a href="#historical-process-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13. [...]
 <table>
@@ -1560,7 +1585,7 @@ line.</p>
 <tr><td><code>druid.host</code></td><td>The host for the current process. This is used to advertise the current processes location as reachable from another process and should generally be specified such that <code>http://${druid.host}/</code> could actually talk to this process</td><td>InetAddress.getLocalHost().getCanonicalHostName()</td></tr>
 <tr><td><code>druid.bindOnHost</code></td><td>Indicating whether the process's internal jetty server bind on <code>druid.host</code>. Default is false, which means binding to all interfaces.</td><td>false</td></tr>
 <tr><td><code>druid.plaintextPort</code></td><td>This is the port to actually listen on; unless port mapping is used, this will be the same port as is on <code>druid.host</code></td><td>8083</td></tr>
-<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/latest/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>8283</td></tr>
+<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/0.21.0/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>8283</td></tr>
 <tr><td><code>druid.service</code></td><td>The name of the service. This is used as a dimension when emitting metrics and alerts to differentiate between the various services</td><td>druid/historical</td></tr>
 </tbody>
 </table>
@@ -1570,8 +1595,8 @@ line.</p>
 <tr><th>Property</th><th>Description</th><th>Default</th></tr>
 </thead>
 <tbody>
-<tr><td><code>druid.server.maxSize</code></td><td>The maximum number of bytes-worth of segments that the process wants assigned to it. The Coordinator process will attempt to assign segments to a Historical process only if this property is greater than the total size of segments served by it. Since this property defines the upper limit on the total segment size that can be assigned to a Historical, it is defaulted to the sum of all <code>maxSize</code> values specified within <code>druid [...]
-<tr><td><code>druid.server.tier</code></td><td>A string to name the distribution tier that the storage process belongs to. Many of the <a href="/docs/latest/operations/rule-configuration.html">rules Coordinator processes use</a> to manage segments can be keyed on tiers.</td><td><code>_default_tier</code></td></tr>
+<tr><td><code>druid.server.maxSize</code></td><td>The maximum number of bytes-worth of segments that the process wants assigned to it. The Coordinator process will attempt to assign segments to a Historical process only if this property is greater than the total size of segments served by it. Since this property defines the upper limit on the total segment size that can be assigned to a Historical, it is defaulted to the sum of all <code>maxSize</code> values specified within <code>druid [...]
+<tr><td><code>druid.server.tier</code></td><td>A string to name the distribution tier that the storage process belongs to. Many of the <a href="/docs/0.21.0/operations/rule-configuration.html">rules Coordinator processes use</a> to manage segments can be keyed on tiers.</td><td><code>_default_tier</code></td></tr>
 <tr><td><code>druid.server.priority</code></td><td>In a tiered architecture, the priority of the tier, thus allowing control over which processes are queried. Higher numbers mean higher priority. The default (no priority) works for architecture with no cross replication (tiers that have no data-storage overlap). Data centers typically have equal priority.</td><td>0</td></tr>
 </tbody>
 </table>
@@ -1582,19 +1607,19 @@ line.</p>
 </thead>
 <tbody>
 <tr><td><code>druid.segmentCache.locations</code></td><td>Segments assigned to a Historical process are first stored on the local file system (in a disk cache) and then served by the Historical process. These locations define where that local cache resides. This value cannot be NULL or EMPTY. Here is an example <code>druid.segmentCache.locations=[{&quot;path&quot;: &quot;/mnt/druidSegments&quot;, &quot;maxSize&quot;: &quot;10k&quot;, &quot;freeSpacePercent&quot;: 1.0}]</code>. &quot;free [...]
-<tr><td><code>druid.segmentCache.locationSelectorStrategy</code></td><td>The strategy used to select a location from the configured <code>druid.segmentCache.locations</code> for segment distribution. Possible values are <code>leastBytesUsed</code>, <code>roundRobin</code>, <code>random</code>, or <code>mostAvailableSize</code>.</td><td>leastBytesUsed</td></tr>
+<tr><td><code>druid.segmentCache.locationSelector.strategy</code></td><td>The strategy used to select a location from the configured <code>druid.segmentCache.locations</code> for segment distribution. Possible values are <code>leastBytesUsed</code>, <code>roundRobin</code>, <code>random</code>, or <code>mostAvailableSize</code>.</td><td>leastBytesUsed</td></tr>
 <tr><td><code>druid.segmentCache.deleteOnRemove</code></td><td>Delete segment files from cache once a process is no longer serving a segment.</td><td>true</td></tr>
 <tr><td><code>druid.segmentCache.dropSegmentDelayMillis</code></td><td>How long a process delays before completely dropping segment.</td><td>30000 (30 seconds)</td></tr>
 <tr><td><code>druid.segmentCache.infoDir</code></td><td>Historical processes keep track of the segments they are serving so that when the process is restarted they can reload the same segments without waiting for the Coordinator to reassign. This path defines where this metadata is kept. Directory will be created if needed.</td><td>${first_location}/info_dir</td></tr>
 <tr><td><code>druid.segmentCache.announceIntervalMillis</code></td><td>How frequently to announce segments while segments are loading from cache. Set this value to zero to wait for all segments to be loaded before announcing.</td><td>5000 (5 seconds)</td></tr>
 <tr><td><code>druid.segmentCache.numLoadingThreads</code></td><td>How many segments to drop or load concurrently from deep storage. Note that the work of loading segments involves downloading segments from deep storage, decompressing them and loading them to a memory mapped location. So the work is not all I/O Bound. Depending on CPU and network load, one could possibly increase this config to a higher value.</td><td>max(1,Number of cores / 6)</td></tr>
 <tr><td><code>druid.segmentCache.numBootstrapThreads</code></td><td>How many segments to load concurrently during historical startup.</td><td><code>druid.segmentCache.numLoadingThreads</code></td></tr>
-<tr><td><code>druid.segmentCache.lazyLoadOnStart</code></td><td>Whether or not to load segment columns metadata lazily during historical startup. When set to true, Historical startup time will be dramatically improved by deferring segment loading until the first time that segment takes part in a query, which will incur this cost instead. One catch is that if historical crashes while in the process of downloading and creating segment files, it is possible to end up with a corrupted segmen [...]
+<tr><td><code>druid.segmentCache.lazyLoadOnStart</code></td><td>Whether or not to load segment columns metadata lazily during historical startup. When set to true, Historical startup time will be dramatically improved by deferring segment loading until the first time that segment takes part in a query, which will incur this cost instead. One catch is that if there were corrupted segments which historical served before on historical disk, this requires manual intervention to delete corrup [...]
 <tr><td><code>druid.coordinator.loadqueuepeon.curator.numCallbackThreads</code></td><td>Number of threads for executing callback actions associated with loading or dropping of segments. One might want to increase this number when noticing clusters are lagging behind w.r.t. balancing segments across historical nodes.</td><td>2</td></tr>
 </tbody>
 </table>
 <p>In <code>druid.segmentCache.locations</code>, <em>freeSpacePercent</em> was added because <em>maxSize</em> setting is only a theoretical limit and assumes that much space will always be available for storing segments. In case of any druid bug leading to unaccounted segment files left alone on disk or some other process writing stuff to disk, This check can start failing segment loading early before filling up the disk completely and leaving the host usable otherwise.</p>
-<p>In <code>druid.segmentCache.locationSelectorStrategy</code>, one of leastBytesUsed, roundRobin, random, or mostAvailableSize could be specified to represent the strategy to distribute segments across multiple segment cache locations.</p>
+<p>In <code>druid.segmentCache.locationSelector.strategy</code>, one of <code>leastBytesUsed</code>, <code>roundRobin</code>, <code>random</code>, or <code>mostAvailableSize</code> could be specified to represent the strategy to distribute segments across multiple segment cache locations.</p>
 <table>
 <thead>
 <tr><th>Strategy</th><th>Description</th></tr>
@@ -1620,9 +1645,9 @@ line.</p>
 <tr><td><code>druid.server.http.maxIdleTime</code></td><td>The Jetty max idle time for a connection.</td><td>PT5M</td></tr>
 <tr><td><code>druid.server.http.enableRequestLimit</code></td><td>If enabled, no requests would be queued in jetty queue and &quot;HTTP 429 Too Many Requests&quot; error response would be sent.</td><td>false</td></tr>
 <tr><td><code>druid.server.http.defaultQueryTimeout</code></td><td>Query timeout in millis, beyond which unfinished queries will be cancelled</td><td>300000</td></tr>
-<tr><td><code>druid.server.http.gracefulShutdownTimeout</code></td><td>The maximum amount of time Jetty waits after receiving shutdown signal. After this timeout the threads will be forcefully shutdown. This allows any queries that are executing to complete.</td><td><code>PT0S</code> (do not wait)</td></tr>
+<tr><td><code>druid.server.http.gracefulShutdownTimeout</code></td><td>The maximum amount of time Jetty waits after receiving shutdown signal. After this timeout the threads will be forcefully shutdown. This allows any queries that are executing to complete(Only values greater than zero are valid).</td><td><code>PT30S</code></td></tr>
 <tr><td><code>druid.server.http.unannouncePropagationDelay</code></td><td>How long to wait for zookeeper unannouncements to propagate before shutting down Jetty. This is a minimum and <code>druid.server.http.gracefulShutdownTimeout</code> does not start counting down until after this period elapses.</td><td><code>PT0S</code> (do not wait)</td></tr>
-<tr><td><code>druid.server.http.maxQueryTimeout</code></td><td>Maximum allowed value (in milliseconds) for <code>timeout</code> parameter. See <a href="/docs/latest/querying/query-context.html">query-context</a> to know more about <code>timeout</code>. Query is rejected if the query context <code>timeout</code> is greater than this value.</td><td>Long.MAX_VALUE</td></tr>
+<tr><td><code>druid.server.http.maxQueryTimeout</code></td><td>Maximum allowed value (in milliseconds) for <code>timeout</code> parameter. See <a href="/docs/0.21.0/querying/query-context.html">query-context</a> to know more about <code>timeout</code>. Query is rejected if the query context <code>timeout</code> is greater than this value.</td><td>Long.MAX_VALUE</td></tr>
 <tr><td><code>druid.server.http.maxRequestHeaderSize</code></td><td>Maximum size of a request header in bytes. Larger headers consume more memory and can make a server more vulnerable to denial of service attacks.</td><td>8 * 1024</td></tr>
 </tbody>
 </table>
@@ -1632,7 +1657,7 @@ line.</p>
 <tr><th>Property</th><th>Description</th><th>Default</th></tr>
 </thead>
 <tbody>
-<tr><td><code>druid.processing.buffer.sizeBytes</code></td><td>This specifies a buffer size for the storage of intermediate results. The computation engine in both the Historical and Realtime processes will use a scratch buffer of this size to do all of their intermediate computations off-heap. Larger values allow for more aggregations in a single pass over the data while smaller values can require more passes depending on the query that is being executed.</td><td>auto (max 1GB)</td></tr>
+<tr><td><code>druid.processing.buffer.sizeBytes</code></td><td>This specifies a buffer size (less than 2GiB), for the storage of intermediate results. The computation engine in both the Historical and Realtime processes will use a scratch buffer of this size to do all of their intermediate computations off-heap. Larger values allow for more aggregations in a single pass over the data while smaller values can require more passes depending on the query that is being executed.  <a href="/do [...]
 <tr><td><code>druid.processing.buffer.poolCacheMaxCount</code></td><td>processing buffer pool caches the buffers for later use, this is the maximum count cache will grow to. note that pool can create more buffers than it can cache if necessary.</td><td>Integer.MAX_VALUE</td></tr>
 <tr><td><code>druid.processing.formatString</code></td><td>Realtime and Historical processes use this format string to name their processing threads.</td><td>processing-%s</td></tr>
 <tr><td><code>druid.processing.numMergeBuffers</code></td><td>The number of direct memory buffers available for merging query results. The buffers are sized by <code>druid.processing.buffer.sizeBytes</code>. This property is effectively a concurrency limit for queries that require merging buffers. If you are using any queries that require merge buffers (currently, just groupBy v2) then you should have at least two of these.</td><td><code>max(2, druid.processing.numThreads / 4)</code></td></tr>
@@ -1658,15 +1683,15 @@ line.</p>
 <tr><td><code>druid.historical.cache.useCache</code></td><td>true, false</td><td>Enable the cache on the Historical.</td><td>false</td></tr>
 <tr><td><code>druid.historical.cache.populateCache</code></td><td>true, false</td><td>Populate the cache on the Historical.</td><td>false</td></tr>
 <tr><td><code>druid.historical.cache.unCacheable</code></td><td>All druid query types</td><td>All query types to not cache.</td><td><code>[]</code></td></tr>
-<tr><td><code>druid.historical.cache.maxEntrySize</code></td><td>Maximum cache entry size in bytes.</td><td>1_000_000</td></tr>
+<tr><td><code>druid.historical.cache.maxEntrySize</code></td><td>positive integer</td><td>Maximum cache entry size in bytes.</td><td>1_000_000</td></tr>
 </tbody>
 </table>
 <p>See <a href="#cache-configuration">cache configuration</a> for how to configure cache settings.</p>
 <h2><a class="anchor" aria-hidden="true" id="query-server"></a><a href="#query-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83. [...]
-<p>This section contains the configuration options for the processes that reside on Query servers (Brokers) in the suggested <a href="../design/processes.html#server-types">three-server configuration</a>.</p>
-<p>Configuration options for the experimental <a href="/docs/latest/design/router.html">Router process</a> are also provided here.</p>
+<p>This section contains the configuration options for the processes that reside on Query servers (Brokers) in the suggested <a href="/docs/0.21.0/design/processes.html#server-types">three-server configuration</a>.</p>
+<p>Configuration options for the experimental <a href="/docs/0.21.0/design/router.html">Router process</a> are also provided here.</p>
 <h3><a class="anchor" aria-hidden="true" id="broker"></a><a href="#broker" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2. [...]
-<p>For general Broker process information, see <a href="/docs/latest/design/broker.html">here</a>.</p>
+<p>For general Broker process information, see <a href="/docs/0.21.0/design/broker.html">here</a>.</p>
 <p>These Broker configurations can be defined in the <code>broker/runtime.properties</code> file.</p>
 <h4><a class="anchor" aria-hidden="true" id="broker-process-configs"></a><a href="#broker-process-configs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0 [...]
 <table>
@@ -1677,7 +1702,7 @@ line.</p>
 <tr><td><code>druid.host</code></td><td>The host for the current process. This is used to advertise the current processes location as reachable from another process and should generally be specified such that <code>http://${druid.host}/</code> could actually talk to this process</td><td>InetAddress.getLocalHost().getCanonicalHostName()</td></tr>
 <tr><td><code>druid.bindOnHost</code></td><td>Indicating whether the process's internal jetty server bind on <code>druid.host</code>. Default is false, which means binding to all interfaces.</td><td>false</td></tr>
 <tr><td><code>druid.plaintextPort</code></td><td>This is the port to actually listen on; unless port mapping is used, this will be the same port as is on <code>druid.host</code></td><td>8082</td></tr>
-<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/latest/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>8282</td></tr>
+<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/0.21.0/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>8282</td></tr>
 <tr><td><code>druid.service</code></td><td>The name of the service. This is used as a dimension when emitting metrics and alerts to differentiate between the various services</td><td>druid/broker</td></tr>
 </tbody>
 </table>
@@ -1707,7 +1732,7 @@ line.</p>
 </table>
 <h5><a class="anchor" aria-hidden="true" id="prioritization-strategies"></a><a href="#prioritization-strategies" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c [...]
 <h6><a class="anchor" aria-hidden="true" id="manual-prioritization-strategy"></a><a href="#manual-prioritization-strategy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 1 [...]
-<p>With this configuration, queries are never assigned a priority automatically, but will preserve a priority manually set on the <a href="/docs/latest/querying/query-context.html">query context</a> with the <code>priority</code> key. This mode can be explicitly set by setting <code>druid.query.scheduler.prioritization.strategy</code> to <code>none</code>.</p>
+<p>With this configuration, queries are never assigned a priority automatically, but will preserve a priority manually set on the <a href="/docs/0.21.0/querying/query-context.html">query context</a> with the <code>priority</code> key. This mode can be explicitly set by setting <code>druid.query.scheduler.prioritization.strategy</code> to <code>none</code>.</p>
 <h6><a class="anchor" aria-hidden="true" id="threshold-prioritization-strategy"></a><a href="#threshold-prioritization-strategy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S1 [...]
 <p>This prioritization strategy lowers the priority of queries that cross any of a configurable set of thresholds, such as how far in the past the data is, how large of an interval a query covers, or the number of segments taking part in a query.</p>
 <p>This strategy can be enabled by setting <code>druid.query.scheduler.prioritization.strategy</code> to <code>threshold</code>.</p>
@@ -1727,7 +1752,7 @@ line.</p>
 <p>In this mode, queries are never assigned a lane, and the concurrent query count will only be limited by <code>druid.server.http.numThreads</code> or <code>druid.query.scheduler.numThreads</code>, if set. This is the default Druid query scheduler operating mode. Enable this strategy explicitly by setting <code>druid.query.scheduler.laning.strategy</code> to <code>none</code>.</p>
 <h6><a class="anchor" aria-hidden="true" id="highlow-laning-strategy"></a><a href="#highlow-laning-strategy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 [...]
 <p>This laning strategy splits queries with a <code>priority</code> below zero into a <code>low</code> query lane, automatically. Queries with priority of zero (the default) or above are considered 'interactive'. The limit on <code>low</code> queries can be set to some desired percentage of the total capacity (or HTTP thread pool size), reserving capacity for interactive queries. Queries in the <code>low</code> lane are <em>not</em> guaranteed their capacity, which may be consumed by int [...]
-<p>If the <code>low</code> lane is specified in the <a href="/docs/latest/querying/query-context.html">query context</a> <code>lane</code> parameter, this will override the computed lane.</p>
+<p>If the <code>low</code> lane is specified in the <a href="/docs/0.21.0/querying/query-context.html">query context</a> <code>lane</code> parameter, this will override the computed lane.</p>
 <p>This strategy can be enabled by setting <code>druid.query.scheduler.laning.strategy=hilo</code>.</p>
 <table>
 <thead>
@@ -1738,7 +1763,7 @@ line.</p>
 </tbody>
 </table>
 <h6><a class="anchor" aria-hidden="true" id="manual-laning-strategy"></a><a href="#manual-laning-strategy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0 [...]
-<p>This laning strategy is best suited for cases where one or more external applications which query Druid are capable of manually deciding what lane a given query should belong to. Configured with a map of lane names to percent or exact max capacities, queries with a matching <code>lane</code> parameter in the <a href="/docs/latest/querying/query-context.html">query context</a> will be subjected to those limits.</p>
+<p>This laning strategy is best suited for cases where one or more external applications which query Druid are capable of manually deciding what lane a given query should belong to. Configured with a map of lane names to percent or exact max capacities, queries with a matching <code>lane</code> parameter in the <a href="/docs/0.21.0/querying/query-context.html">query context</a> will be subjected to those limits.</p>
 <table>
 <thead>
 <tr><th>Property</th><th>Description</th><th>Default</th></tr>
@@ -1760,11 +1785,11 @@ line.</p>
 <tr><td><code>druid.server.http.maxIdleTime</code></td><td>The Jetty max idle time for a connection.</td><td>PT5M</td></tr>
 <tr><td><code>druid.server.http.enableRequestLimit</code></td><td>If enabled, no requests would be queued in jetty queue and &quot;HTTP 429 Too Many Requests&quot; error response would be sent.</td><td>false</td></tr>
 <tr><td><code>druid.server.http.defaultQueryTimeout</code></td><td>Query timeout in millis, beyond which unfinished queries will be cancelled</td><td>300000</td></tr>
-<tr><td><code>druid.server.http.maxScatterGatherBytes</code></td><td>Maximum number of bytes gathered from data processes such as Historicals and realtime processes to execute a query. Queries that exceed this limit will fail. This is an advance configuration that allows to protect in case Broker is under heavy load and not utilizing the data gathered in memory fast enough and leading to OOMs. This limit can be further reduced at query time using <code>maxScatterGatherBytes</code> in the [...]
+<tr><td><code>druid.server.http.maxScatterGatherBytes</code></td><td>Maximum number of bytes gathered from data processes such as Historicals and realtime processes to execute a query. Queries that exceed this limit will fail. This is an advance configuration that allows to protect in case Broker is under heavy load and not utilizing the data gathered in memory fast enough and leading to OOMs. This limit can be further reduced at query time using <code>maxScatterGatherBytes</code> in the [...]
 <tr><td><code>druid.server.http.maxSubqueryRows</code></td><td>Maximum number of rows from subqueries per query. These rows are stored in memory.</td><td>100000</td></tr>
-<tr><td><code>druid.server.http.gracefulShutdownTimeout</code></td><td>The maximum amount of time Jetty waits after receiving shutdown signal. After this timeout the threads will be forcefully shutdown. This allows any queries that are executing to complete.</td><td><code>PT0S</code> (do not wait)</td></tr>
+<tr><td><code>druid.server.http.gracefulShutdownTimeout</code></td><td>The maximum amount of time Jetty waits after receiving shutdown signal. After this timeout the threads will be forcefully shutdown. This allows any queries that are executing to complete(Only values greater than zero are valid).</td><td><code>PT30S</code></td></tr>
 <tr><td><code>druid.server.http.unannouncePropagationDelay</code></td><td>How long to wait for zookeeper unannouncements to propagate before shutting down Jetty. This is a minimum and <code>druid.server.http.gracefulShutdownTimeout</code> does not start counting down until after this period elapses.</td><td><code>PT0S</code> (do not wait)</td></tr>
-<tr><td><code>druid.server.http.maxQueryTimeout</code></td><td>Maximum allowed value (in milliseconds) for <code>timeout</code> parameter. See <a href="/docs/latest/querying/query-context.html">query-context</a> to know more about <code>timeout</code>. Query is rejected if the query context <code>timeout</code> is greater than this value.</td><td>Long.MAX_VALUE</td></tr>
+<tr><td><code>druid.server.http.maxQueryTimeout</code></td><td>Maximum allowed value (in milliseconds) for <code>timeout</code> parameter. See <a href="/docs/0.21.0/querying/query-context.html">query-context</a> to know more about <code>timeout</code>. Query is rejected if the query context <code>timeout</code> is greater than this value.</td><td>Long.MAX_VALUE</td></tr>
 <tr><td><code>druid.server.http.maxRequestHeaderSize</code></td><td>Maximum size of a request header in bytes. Larger headers consume more memory and can make a server more vulnerable to denial of service attacks.</td><td>8 * 1024</td></tr>
 </tbody>
 </table>
@@ -1780,7 +1805,7 @@ client has the following configuration options.</p>
 <tr><td><code>druid.broker.http.compressionCodec</code></td><td>Compression codec the Broker uses to communicate with Historical and real-time processes. May be &quot;gzip&quot; or &quot;identity&quot;.</td><td><code>gzip</code></td></tr>
 <tr><td><code>druid.broker.http.readTimeout</code></td><td>The timeout for data reads from Historical servers and real-time tasks.</td><td><code>PT15M</code></td></tr>
 <tr><td><code>druid.broker.http.unusedConnectionTimeout</code></td><td>The timeout for idle connections in connection pool. The connection in the pool will be closed after this timeout and a new one will be established. This timeout should be less than <code>druid.broker.http.readTimeout</code>. Set this timeout = ~90% of <code>druid.broker.http.readTimeout</code></td><td><code>PT4M</code></td></tr>
-<tr><td><code>druid.broker.http.maxQueuedBytes</code></td><td>Maximum number of bytes queued per query before exerting backpressure on the channel to the data server. Similar to <code>druid.server.http.maxScatterGatherBytes</code>, except unlike that configuration, this one will trigger backpressure rather than query failure. Zero means disabled. Can be overridden by the <a href="/docs/latest/querying/query-context.html">&quot;maxQueuedBytes&quot; query context parameter</a>. Human-reada [...]
+<tr><td><code>druid.broker.http.maxQueuedBytes</code></td><td>Maximum number of bytes queued per query before exerting backpressure on the channel to the data server. Similar to <code>druid.server.http.maxScatterGatherBytes</code>, except unlike that configuration, this one will trigger backpressure rather than query failure. Zero means disabled. Can be overridden by the <a href="/docs/0.21.0/querying/query-context.html">&quot;maxQueuedBytes&quot; query context parameter</a>. Human-reada [...]
 <tr><td><code>druid.broker.http.numMaxThreads</code></td><td>`Maximum number of I/O worker threads</td><td>max(10, ((number of cores * 17) / 16 + 2) + 30)`</td></tr>
 </tbody>
 </table>
@@ -1801,7 +1826,7 @@ client has the following configuration options.</p>
 <tr><th>Property</th><th>Description</th><th>Default</th></tr>
 </thead>
 <tbody>
-<tr><td><code>druid.processing.buffer.sizeBytes</code></td><td>This specifies a buffer size for the storage of intermediate results. The computation engine in both the Historical and Realtime processes will use a scratch buffer of this size to do all of their intermediate computations off-heap. Larger values allow for more aggregations in a single pass over the data while smaller values can require more passes depending on the query that is being executed. It can be configured as describ [...]
+<tr><td><code>druid.processing.buffer.sizeBytes</code></td><td>This specifies a buffer size (less than 2GiB) for the storage of intermediate results. The computation engine in both the Historical and Realtime processes will use a scratch buffer of this size to do all of their intermediate computations off-heap. Larger values allow for more aggregations in a single pass over the data while smaller values can require more passes depending on the query that is being executed. <a href="/docs [...]
 <tr><td><code>druid.processing.buffer.poolCacheMaxCount</code></td><td>processing buffer pool caches the buffers for later use, this is the maximum count cache will grow to. note that pool can create more buffers than it can cache if necessary.</td><td>Integer.MAX_VALUE</td></tr>
 <tr><td><code>druid.processing.formatString</code></td><td>Realtime and Historical processes use this format string to name their processing threads.</td><td>processing-%s</td></tr>
 <tr><td><code>druid.processing.numMergeBuffers</code></td><td>The number of direct memory buffers available for merging query results. The buffers are sized by <code>druid.processing.buffer.sizeBytes</code>. This property is effectively a concurrency limit for queries that require merging buffers. If you are using any queries that require merge buffers (currently, just groupBy v2) then you should have at least two of these.</td><td><code>max(2, druid.processing.numThreads / 4)</code></td></tr>
@@ -1838,10 +1863,10 @@ line.</p>
 <tr><td><code>druid.sql.avatica.maxStatementsPerConnection</code></td><td>Maximum number of simultaneous open statements per Avatica client connection.</td><td>4</td></tr>
 <tr><td><code>druid.sql.avatica.connectionIdleTimeout</code></td><td>Avatica client connection idle timeout.</td><td>PT5M</td></tr>
 <tr><td><code>druid.sql.http.enable</code></td><td>Whether to enable JSON over HTTP querying at <code>/druid/v2/sql/</code>.</td><td>true</td></tr>
-<tr><td><code>druid.sql.planner.maxTopNLimit</code></td><td>Maximum threshold for a <a href="/docs/latest/querying/topnquery.html">TopN query</a>. Higher limits will be planned as <a href="/docs/latest/querying/groupbyquery.html">GroupBy queries</a> instead.</td><td>100000</td></tr>
+<tr><td><code>druid.sql.planner.maxTopNLimit</code></td><td>Maximum threshold for a <a href="/docs/0.21.0/querying/topnquery.html">TopN query</a>. Higher limits will be planned as <a href="/docs/0.21.0/querying/groupbyquery.html">GroupBy queries</a> instead.</td><td>100000</td></tr>
 <tr><td><code>druid.sql.planner.metadataRefreshPeriod</code></td><td>Throttle for metadata refreshes.</td><td>PT1M</td></tr>
 <tr><td><code>druid.sql.planner.useApproximateCountDistinct</code></td><td>Whether to use an approximate cardinality algorithm for <code>COUNT(DISTINCT foo)</code>.</td><td>true</td></tr>
-<tr><td><code>druid.sql.planner.useApproximateTopN</code></td><td>Whether to use approximate <a href="../querying/topnquery.html">TopN queries</a> when a SQL query could be expressed as such. If false, exact <a href="../querying/groupbyquery.html">GroupBy queries</a> will be used instead.</td><td>true</td></tr>
+<tr><td><code>druid.sql.planner.useApproximateTopN</code></td><td>Whether to use approximate <a href="/docs/0.21.0/querying/topnquery.html">TopN queries</a> when a SQL query could be expressed as such. If false, exact <a href="/docs/0.21.0/querying/groupbyquery.html">GroupBy queries</a> will be used instead.</td><td>true</td></tr>
 <tr><td><code>druid.sql.planner.requireTimeCondition</code></td><td>Whether to require SQL to have filter conditions on __time column so that all generated native queries will have user specified intervals. If true, all queries without filter condition on __time column will fail</td><td>false</td></tr>
 <tr><td><code>druid.sql.planner.sqlTimeZone</code></td><td>Sets the default time zone for the server, which will affect how time functions and timestamp literals behave. Should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;.</td><td>UTC</td></tr>
 <tr><td><code>druid.sql.planner.metadataSegmentCacheEnable</code></td><td>Whether to keep a cache of published segments in broker. If true, broker polls coordinator in background to get segments from metadata store and maintains a local cache. If false, coordinator's REST API will be invoked when broker needs published segments info.</td><td>false</td></tr>
@@ -1927,7 +1952,7 @@ for both Broker and Historical processes, when defined in the common properties
 </thead>
 <tbody>
 <tr><td><code>druid.cache.type</code></td><td>Set this to <code>caffeine</code> or leave out parameter</td><td><code>caffeine</code></td></tr>
-<tr><td><code>druid.cache.sizeInBytes</code></td><td>The maximum size of the cache in bytes on heap. It can be configured as described in <a href="/docs/latest/configuration/human-readable-byte.html">here</a>.</td><td>min(1GiB, Runtime.maxMemory / 10)</td></tr>
+<tr><td><code>druid.cache.sizeInBytes</code></td><td>The maximum size of the cache in bytes on heap. It can be configured as described in <a href="/docs/0.21.0/configuration/human-readable-byte.html">here</a>.</td><td>min(1GiB, Runtime.maxMemory / 10)</td></tr>
 <tr><td><code>druid.cache.expireAfter</code></td><td>The time (in ms) after an access for which a cache entry may be expired</td><td>None (no time limit)</td></tr>
 <tr><td><code>druid.cache.cacheExecutorFactory</code></td><td>The executor factory to use for Caffeine maintenance. One of <code>COMMON_FJP</code>, <code>SINGLE_THREAD</code>, or <code>SAME_THREAD</code></td><td>ForkJoinPool common pool (<code>COMMON_FJP</code>)</td></tr>
 <tr><td><code>druid.cache.evictOnClose</code></td><td>If a close of a namespace (ex: removing a segment from a process) should cause an eager eviction of associated cache values</td><td><code>false</code></td></tr>
@@ -1990,7 +2015,7 @@ If there is an L1 miss and L2 hit, it will also populate L1.</p>
 <h2><a class="anchor" aria-hidden="true" id="general-query-configuration"></a><a href="#general-query-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 1 [...]
 <p>This section describes configurations that control behavior of Druid's query types, applicable to Broker, Historical, and MiddleManager processes.</p>
 <h3><a class="anchor" aria-hidden="true" id="overriding-default-query-context-values"></a><a href="#overriding-default-query-context-values" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2  [...]
-<p>Any <a href="../querying/query-context.html#general-parameters">Query Context General Parameter</a> default value can be
+<p>Any <a href="/docs/0.21.0/querying/query-context.html#general-parameters">Query Context General Parameter</a> default value can be
 overridden by setting runtime property in the format of <code>druid.query.default.context.{query_context_key}</code>.
 <code>druid.query.default.context.{query_context_key}</code> runtime property prefix applies to all current and future
 query context keys, the same as how query context parameter passed with the query works. Note that the runtime property
@@ -2018,7 +2043,7 @@ context). If query does have <code>maxQueuedBytes</code> in the context, then th
 <tr><th>Property</th><th>Description</th><th>Default</th></tr>
 </thead>
 <tbody>
-<tr><td><code>druid.query.topN.minTopNThreshold</code></td><td>See <a href="../querying/topnquery.html#aliasing">TopN Aliasing</a> for details.</td><td>1000</td></tr>
+<tr><td><code>druid.query.topN.minTopNThreshold</code></td><td>See <a href="/docs/0.21.0/querying/topnquery.html#aliasing">TopN Aliasing</a> for details.</td><td>1000</td></tr>
 </tbody>
 </table>
 <h3><a class="anchor" aria-hidden="true" id="search-query-config"></a><a href="#search-query-config" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.2 [...]
@@ -2042,7 +2067,7 @@ context). If query does have <code>maxQueuedBytes</code> in the context, then th
 </tbody>
 </table>
 <h3><a class="anchor" aria-hidden="true" id="groupby-query-config"></a><a href="#groupby-query-config" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1 [...]
-<p>This section describes the configurations for groupBy queries. You can set the runtime properties in the <code>runtime.properties</code> file on Broker, Historical, and MiddleManager processes. You can set the query context parameters through the <a href="/docs/latest/querying/query-context.html">query context</a>.</p>
+<p>This section describes the configurations for groupBy queries. You can set the runtime properties in the <code>runtime.properties</code> file on Broker, Historical, and MiddleManager processes. You can set the query context parameters through the <a href="/docs/0.21.0/querying/query-context.html">query context</a>.</p>
 <h4><a class="anchor" aria-hidden="true" id="configurations-for-groupby-v2"></a><a href="#configurations-for-groupby-v2" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12  [...]
 <p>Supported runtime properties:</p>
 <table>
@@ -2147,7 +2172,7 @@ context). If query does have <code>maxQueuedBytes</code> in the context, then th
 <tr><td><code>druid.host</code></td><td>The host for the current process. This is used to advertise the current processes location as reachable from another process and should generally be specified such that <code>http://${druid.host}/</code> could actually talk to this process</td><td>InetAddress.getLocalHost().getCanonicalHostName()</td></tr>
 <tr><td><code>druid.bindOnHost</code></td><td>Indicating whether the process's internal jetty server bind on <code>druid.host</code>. Default is false, which means binding to all interfaces.</td><td>false</td></tr>
 <tr><td><code>druid.plaintextPort</code></td><td>This is the port to actually listen on; unless port mapping is used, this will be the same port as is on <code>druid.host</code></td><td>8888</td></tr>
-<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/latest/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>9088</td></tr>
+<tr><td><code>druid.tlsPort</code></td><td>TLS port for HTTPS connector, if <a href="/docs/0.21.0/operations/tls-support.html">druid.enableTlsPort</a> is set then this config will be used. If <code>druid.host</code> contains port then that port will be ignored. This should be a non-negative Integer.</td><td>9088</td></tr>
 <tr><td><code>druid.service</code></td><td>The name of the service. This is used as a dimension when emitting metrics and alerts to differentiate between the various services</td><td>druid/router</td></tr>
 </tbody>
 </table>
@@ -2161,9 +2186,9 @@ context). If query does have <code>maxQueuedBytes</code> in the context, then th
 <tr><td><code>druid.router.tierToBrokerMap</code></td><td>Queries for a certain tier of data are routed to their appropriate Broker. This value should be an ordered JSON map of tiers to Broker names. The priority of Brokers is based on the ordering.</td><td>{&quot;_default_tier&quot;: &quot;<defaultBrokerServiceName>&quot;}</td></tr>
 <tr><td><code>druid.router.defaultRule</code></td><td>The default rule for all datasources.</td><td>&quot;_default&quot;</td></tr>
 <tr><td><code>druid.router.pollPeriod</code></td><td>How often to poll for new rules.</td><td>PT1M</td></tr>
-<tr><td><code>druid.router.strategies</code></td><td>Please see <a href="../design/router.html#router-strategies">Router Strategies</a> for details.</td><td>[{&quot;type&quot;:&quot;timeBoundary&quot;},{&quot;type&quot;:&quot;priority&quot;}]</td></tr>
-<tr><td><code>druid.router.avatica.balancer.type</code></td><td>Class to use for balancing Avatica queries across Brokers. Please see <a href="../design/router.html#avatica-query-balancing">Avatica Query Balancing</a>.</td><td>rendezvousHash</td></tr>
-<tr><td><code>druid.router.managementProxy.enabled</code></td><td>Enables the Router's <a href="../design/router.html#router-as-management-proxy">management proxy</a> functionality.</td><td>false</td></tr>
+<tr><td><code>druid.router.strategies</code></td><td>Please see <a href="/docs/0.21.0/design/router.html#router-strategies">Router Strategies</a> for details.</td><td>[{&quot;type&quot;:&quot;timeBoundary&quot;},{&quot;type&quot;:&quot;priority&quot;}]</td></tr>
+<tr><td><code>druid.router.avatica.balancer.type</code></td><td>Class to use for balancing Avatica queries across Brokers. Please see <a href="/docs/0.21.0/design/router.html#avatica-query-balancing">Avatica Query Balancing</a>.</td><td>rendezvousHash</td></tr>
+<tr><td><code>druid.router.managementProxy.enabled</code></td><td>Enables the Router's <a href="/docs/0.21.0/design/router.html#router-as-management-proxy">management proxy</a> functionality.</td><td>false</td></tr>
 <tr><td><code>druid.router.http.numConnections</code></td><td>Size of connection pool for the Router to connect to Broker processes. If there are more queries than this number that all need to speak to the same process, then they will queue up.</td><td><code>20</code></td></tr>
 <tr><td><code>druid.router.http.readTimeout</code></td><td>The timeout for data reads from Broker processes.</td><td><code>PT15M</code></td></tr>
 <tr><td><code>druid.router.http.numMaxThreads</code></td><td>Maximum number of worker threads to handle HTTP requests and responses</td><td><code>max(10, ((number of cores * 17) / 16 + 2) + 30)</code></td></tr>
@@ -2171,7 +2196,7 @@ context). If query does have <code>maxQueuedBytes</code> in the context, then th
 <tr><td><code>druid.router.http.requestBuffersize</code></td><td>Size of the content buffer for receiving requests. These buffers are only used for active connections that have requests with bodies that will not fit within the header buffer</td><td><code>8 * 1024</code></td></tr>
 </tbody>
 </table>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/geo.html"><span class="arrow-prev">← </span><span>Spatial filters</span></a><a class="docs-next button" href="/docs/latest/development/extensions.html"><span>Extensions</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#recommended-configuration-file-organization">Recommended Configuration File Organiza [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/geo.html"><span class="arrow-prev">← </span><span>Spatial filters</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions.html"><span>Extensions</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#recommended-configuration-file-organization">Recommended Configuration File Organiza [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -2188,6 +2213,6 @@ context). If query does have <code>maxQueuedBytes</code> in the context, then th
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/configuration/indexing-service.html b/docs/0.21.0/configuration/indexing-service.html
new file mode 100644
index 0000000..4189126
--- /dev/null
+++ b/docs/0.21.0/configuration/indexing-service.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../configuration/index.html#overlord">
+<meta http-equiv="refresh" content="0; url=../configuration/index.html#overlord">
+<h1>Redirecting...</h1>
+<a href="../configuration/index.html#overlord">Click here if you are not redirected.</a>
+<script>location="../configuration/index.html#overlord"</script>
diff --git a/docs/latest/configuration/logging.html b/docs/0.21.0/configuration/logging.html
similarity index 54%
copy from docs/latest/configuration/logging.html
copy to docs/0.21.0/configuration/logging.html
index 6c3f5a2..daf3719 100644
--- a/docs/latest/configuration/logging.html
+++ b/docs/0.21.0/configuration/logging.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Logging · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/configuration/logging.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.2" /><meta prop [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Logging · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/configuration/logging.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21.0" /><meta prop [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,7 +77,7 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>Apache Druid processes will emit logs that are useful for debugging to the console. Druid processes also emit periodic metrics about their state. For more about metrics, see <a href="../configuration/index.html#enabling-metrics">Configuration</a>. Metric logs are printed to the console by default, and can be disabled with <code>-Ddruid.emitter.logging.logLevel=debug</code>.</p>
+<p>Apache Druid processes will emit logs that are useful for debugging to the console. Druid processes also emit periodic metrics about their state. For more about metrics, see <a href="/docs/0.21.0/configuration/index.html#enabling-metrics">Configuration</a>. Metric logs are printed to the console by default, and can be disabled with <code>-Ddruid.emitter.logging.logLevel=debug</code>.</p>
 <p>Druid uses <a href="http://logging.apache.org/log4j/2.x/">log4j2</a> for logging. Logging can be configured with a log4j2.xml file. Add the path to the directory containing the log4j2.xml file (e.g. the _common/ dir) to your classpath if you want to override default Druid log configuration. Note that this directory should be earlier in the classpath than the druid jars. The easiest way to do this is to prefix the classpath with the config dir.</p>
 <p>To enable java logging to go through log4j2, set the <code>-Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager</code> server parameter.</p>
 <p>An example log4j2.xml ships with Druid under config/_common/log4j2.xml, and a sample file is also shown below:</p>
@@ -130,7 +130,7 @@
   <span class="hljs-tag">&lt;/<span class="hljs-name">Loggers</span>&gt;</span>
 <span class="hljs-tag">&lt;/<span class="hljs-name">Configuration</span>&gt;</span>
 </span></code></pre>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions.html"><span class="arrow-prev">← </span><span>Extensions</span></a><a class="docs-next button" href="/docs/latest/operations/druid-console.html"><span>Web console</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#my-logs-are-really-chatty-can-i-set-them-to-asynchronously-write">My logs are r [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions.html"><span class="arrow-prev">← </span><span>Extensions</span></a><a class="docs-next button" href="/docs/0.21.0/operations/druid-console.html"><span>Web console</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#my-logs-are-really-chatty-can-i-set-them-to-asynchronously-write">My logs are r [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -147,6 +147,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/configuration/production-cluster.html b/docs/0.21.0/configuration/production-cluster.html
new file mode 100644
index 0000000..d3b1d39
--- /dev/null
+++ b/docs/0.21.0/configuration/production-cluster.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../tutorials/cluster.html">
+<meta http-equiv="refresh" content="0; url=../tutorials/cluster.html">
+<h1>Redirecting...</h1>
+<a href="../tutorials/cluster.html">Click here if you are not redirected.</a>
+<script>location="../tutorials/cluster.html"</script>
diff --git a/docs/0.21.0/configuration/realtime.html b/docs/0.21.0/configuration/realtime.html
new file mode 100644
index 0000000..2f57fca
--- /dev/null
+++ b/docs/0.21.0/configuration/realtime.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../ingestion/standalone-realtime.html">
+<meta http-equiv="refresh" content="0; url=../ingestion/standalone-realtime.html">
+<h1>Redirecting...</h1>
+<a href="../ingestion/standalone-realtime.html">Click here if you are not redirected.</a>
+<script>location="../ingestion/standalone-realtime.html"</script>
diff --git a/docs/0.21.0/configuration/simple-cluster.html b/docs/0.21.0/configuration/simple-cluster.html
new file mode 100644
index 0000000..d3b1d39
--- /dev/null
+++ b/docs/0.21.0/configuration/simple-cluster.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../tutorials/cluster.html">
+<meta http-equiv="refresh" content="0; url=../tutorials/cluster.html">
+<h1>Redirecting...</h1>
+<a href="../tutorials/cluster.html">Click here if you are not redirected.</a>
+<script>location="../tutorials/cluster.html"</script>
diff --git a/docs/0.21.0/configuration/zookeeper.html b/docs/0.21.0/configuration/zookeeper.html
new file mode 100644
index 0000000..24b4630
--- /dev/null
+++ b/docs/0.21.0/configuration/zookeeper.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../dependencies/zookeeper.html">
+<meta http-equiv="refresh" content="0; url=../dependencies/zookeeper.html">
+<h1>Redirecting...</h1>
+<a href="../dependencies/zookeeper.html">Click here if you are not redirected.</a>
+<script>location="../dependencies/zookeeper.html"</script>
diff --git a/docs/0.21.0/dependencies/cassandra-deep-storage.html b/docs/0.21.0/dependencies/cassandra-deep-storage.html
new file mode 100644
index 0000000..c3328a4
--- /dev/null
+++ b/docs/0.21.0/dependencies/cassandra-deep-storage.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../development/extensions-contrib/cassandra.html">
+<meta http-equiv="refresh" content="0; url=../development/extensions-contrib/cassandra.html">
+<h1>Redirecting...</h1>
+<a href="../development/extensions-contrib/cassandra.html">Click here if you are not redirected.</a>
+<script>location="../development/extensions-contrib/cassandra.html"</script>
diff --git a/docs/latest/dependencies/deep-storage.html b/docs/0.21.0/dependencies/deep-storage.html
similarity index 50%
copy from docs/latest/dependencies/deep-storage.html
copy to docs/0.21.0/dependencies/deep-storage.html
index 07b1839..f7cdbf4 100644
--- a/docs/latest/dependencies/deep-storage.html
+++ b/docs/0.21.0/dependencies/deep-storage.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Deep storage · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/dependencies/deep-storage.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.2" />< [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Deep storage · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/dependencies/deep-storage.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21.0" />< [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -93,12 +93,12 @@
 <p>Note that you should generally set <code>druid.storage.storageDirectory</code> to something different from <code>druid.segmentCache.locations</code> and <code>druid.segmentCache.infoDir</code>.</p>
 <p>If you are using the Hadoop indexer in local mode, then just give it a local file as your output directory and it will work.</p>
 <h2><a class="anchor" aria-hidden="true" id="s3-compatible"></a><a href="#s3-compatible" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
-<p>See <a href="/docs/latest/development/extensions-core/s3.html">druid-s3-extensions extension documentation</a>.</p>
+<p>See <a href="/docs/0.21.0/development/extensions-core/s3.html">druid-s3-extensions extension documentation</a>.</p>
 <h2><a class="anchor" aria-hidden="true" id="hdfs"></a><a href="#hdfs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6 [...]
-<p>See <a href="/docs/latest/development/extensions-core/hdfs.html">druid-hdfs-storage extension documentation</a>.</p>
+<p>See <a href="/docs/0.21.0/development/extensions-core/hdfs.html">druid-hdfs-storage extension documentation</a>.</p>
 <h2><a class="anchor" aria-hidden="true" id="additional-deep-stores"></a><a href="#additional-deep-stores" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0 [...]
-<p>For additional deep stores, please see our <a href="/docs/latest/development/extensions.html">extensions list</a>.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/design/processes.html"><span class="arrow-prev">← </span><span>Processes and servers</span></a><a class="docs-next button" href="/docs/latest/dependencies/metadata-storage.html"><span>Metadata storage</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#local-mount">Local Mount</a></li><li><a href="#s3-compatible">S3 [...]
+<p>For additional deep stores, please see our <a href="/docs/0.21.0/development/extensions.html">extensions list</a>.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/design/processes.html"><span class="arrow-prev">← </span><span>Processes and servers</span></a><a class="docs-next button" href="/docs/0.21.0/dependencies/metadata-storage.html"><span>Metadata storage</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#local-mount">Local Mount</a></li><li><a href="#s3-compatible">S3 [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -115,6 +115,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/dependencies/metadata-storage.html b/docs/0.21.0/dependencies/metadata-storage.html
similarity index 58%
copy from docs/latest/dependencies/metadata-storage.html
copy to docs/0.21.0/dependencies/metadata-storage.html
index 9d166a4..09664c7 100644
--- a/docs/latest/dependencies/metadata-storage.html
+++ b/docs/0.21.0/dependencies/metadata-storage.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Metadata storage · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/dependencies/metadata-storage.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.2 [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Metadata storage · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/dependencies/metadata-storage.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.2 [...]
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@@ -81,7 +81,7 @@
 various metadata about the system, but not to store the actual data. There are
 a number of tables used for various purposes described below.</p>
 <p>Derby is the default metadata store for Druid, however, it is not suitable for production.
-<a href="/docs/latest/development/extensions-core/mysql.html">MySQL</a> and <a href="/docs/latest/development/extensions-core/postgresql.html">PostgreSQL</a> are more production suitable metadata stores.</p>
+<a href="/docs/0.21.0/development/extensions-core/mysql.html">MySQL</a> and <a href="/docs/0.21.0/development/extensions-core/postgresql.html">PostgreSQL</a> are more production suitable metadata stores.</p>
 <blockquote>
 <p>The Metadata Storage stores the entire metadata which is essential for a Druid cluster to work.
 For production clusters, consider using MySQL or PostgreSQL instead of Derby.
@@ -94,22 +94,22 @@ because there is no way to restore if you lose any metadata.</p>
 <span class="hljs-meta">druid.metadata.storage.connector.connectURI</span>=<span class="hljs-string">jdbc:derby://localhost:1527//opt/var/druid_state/derby;create=true</span>
 </code></pre>
 <h2><a class="anchor" aria-hidden="true" id="mysql"></a><a href="#mysql" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09 [...]
-<p>See <a href="/docs/latest/development/extensions-core/mysql.html">mysql-metadata-storage extension documentation</a>.</p>
+<p>See <a href="/docs/0.21.0/development/extensions-core/mysql.html">mysql-metadata-storage extension documentation</a>.</p>
 <h2><a class="anchor" aria-hidden="true" id="postgresql"></a><a href="#postgresql" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1 [...]
-<p>See <a href="/docs/latest/development/extensions-core/postgresql.html">postgresql-metadata-storage</a>.</p>
+<p>See <a href="/docs/0.21.0/development/extensions-core/postgresql.html">postgresql-metadata-storage</a>.</p>
 <h2><a class="anchor" aria-hidden="true" id="adding-custom-dbcp-properties"></a><a href="#adding-custom-dbcp-properties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12  [...]
 <p>NOTE: These properties are not settable through the <code>druid.metadata.storage.connector.dbcp properties</code>: <code>username</code>, <code>password</code>, <code>connectURI</code>, <code>validationQuery</code>, <code>testOnBorrow</code>. These must be set through <code>druid.metadata.storage.connector</code> properties.</p>
 <p>Example supported properties:</p>
 <pre><code class="hljs css language-properties"><span class="hljs-meta">druid.metadata.storage.connector.dbcp.maxConnLifetimeMillis</span>=<span class="hljs-string">1200000</span>
 <span class="hljs-meta">druid.metadata.storage.connector.dbcp.defaultQueryTimeout</span>=<span class="hljs-string">30000</span>
 </code></pre>
-<p>See <a href="https://commons.apache.org/proper/commons-dbcp/configuration.html">BasicDataSource Configuration</a> for full list.</p>
+<p>See <a href="https://commons.apache.org/proper/commons-dbcp/configuration">BasicDataSource Configuration</a> for full list.</p>
 <h2><a class="anchor" aria-hidden="true" id="metadata-storage-tables"></a><a href="#metadata-storage-tables" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 [...]
 <h3><a class="anchor" aria-hidden="true" id="segments-table"></a><a href="#segments-table" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0- [...]
 <p>This is dictated by the <code>druid.metadata.storage.tables.segments</code> property.</p>
 <p>This table stores metadata about the segments that should be available in the system. (This set of segments is called
 &quot;used segments&quot; elsewhere in the documentation and throughout the project.) The table is polled by the
-<a href="/docs/latest/design/coordinator.html">Coordinator</a> to determine the set of segments that should be available for querying in the
+<a href="/docs/0.21.0/design/coordinator.html">Coordinator</a> to determine the set of segments that should be available for querying in the
 system. The table has two main functional columns, the other columns are for indexing purposes.</p>
 <p>Value 1 in the <code>used</code> column means that the segment should be &quot;used&quot; by the cluster (i.e., it should be loaded and
 available for requests). Value 0 means that the segment should not be loaded into the cluster. We do this as a means of
@@ -136,7 +136,7 @@ that is ever an issue).</p>
 <p>Note that the format of this blob can and will change from time-to-time.</p>
 <h3><a class="anchor" aria-hidden="true" id="rule-table"></a><a href="#rule-table" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1 [...]
 <p>The rule table is used to store the various rules about where segments should
-land. These rules are used by the <a href="/docs/latest/design/coordinator.html">Coordinator</a>
+land. These rules are used by the <a href="/docs/0.21.0/design/coordinator.html">Coordinator</a>
 when making segment (re-)allocation decisions about the cluster.</p>
 <h3><a class="anchor" aria-hidden="true" id="config-table"></a><a href="#config-table" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83. [...]
 <p>The config table is used to store runtime configuration objects. We do not have
@@ -144,10 +144,10 @@ many of these yet and we are not sure if we will keep this mechanism going
 forward, but it is the beginnings of a method of changing some configuration
 parameters across the cluster at runtime.</p>
 <h3><a class="anchor" aria-hidden="true" id="task-related-tables"></a><a href="#task-related-tables" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.2 [...]
-<p>There are also a number of tables created and used by the <a href="/docs/latest/design/overlord.html">Overlord</a> and <a href="/docs/latest/design/middlemanager.html">MiddleManager</a> when managing tasks.</p>
+<p>There are also a number of tables created and used by the <a href="/docs/0.21.0/design/overlord.html">Overlord</a> and <a href="/docs/0.21.0/design/middlemanager.html">MiddleManager</a> when managing tasks.</p>
 <h3><a class="anchor" aria-hidden="true" id="audit-table"></a><a href="#audit-table" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42 [...]
 <p>The Audit table is used to store the audit history for configuration changes
-e.g rule changes done by <a href="/docs/latest/design/coordinator.html">Coordinator</a> and other
+e.g rule changes done by <a href="/docs/0.21.0/design/coordinator.html">Coordinator</a> and other
 config changes.</p>
 <p>##Accessed by: ##</p>
 <p>The Metadata Storage is accessed only by:</p>
@@ -157,7 +157,7 @@ config changes.</p>
 <li>Coordinator Processes</li>
 </ol>
 <p>Thus you need to give permissions (e.g., in AWS Security Groups) only for these machines to access the Metadata storage.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/dependencies/deep-storage.html"><span class="arrow-prev">← </span><span>Deep storage</span></a><a class="docs-next button" href="/docs/latest/dependencies/zookeeper.html"><span class="function-name-prevnext">ZooKeeper</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#using-derby">Using Derby</a></li><li><a href="# [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/dependencies/deep-storage.html"><span class="arrow-prev">← </span><span>Deep storage</span></a><a class="docs-next button" href="/docs/0.21.0/dependencies/zookeeper.html"><span class="function-name-prevnext">ZooKeeper</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#using-derby">Using Derby</a></li><li><a href="# [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -174,6 +174,6 @@ config changes.</p>
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/dependencies/zookeeper.html b/docs/0.21.0/dependencies/zookeeper.html
similarity index 50%
copy from docs/latest/dependencies/zookeeper.html
copy to docs/0.21.0/dependencies/zookeeper.html
index ca56dfc..cb9a4cc 100644
--- a/docs/latest/dependencies/zookeeper.html
+++ b/docs/0.21.0/dependencies/zookeeper.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>ZooKeeper · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/dependencies/zookeeper.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.2" /><meta p [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>ZooKeeper · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/dependencies/zookeeper.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21.0" /><meta p [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -79,11 +79,11 @@
   -->
 <p>Apache Druid uses <a href="http://zookeeper.apache.org/">Apache ZooKeeper</a> (ZK) for management of current cluster state. The operations that happen over ZK are</p>
 <ol>
-<li><a href="/docs/latest/design/coordinator.html">Coordinator</a> leader election</li>
-<li>Segment &quot;publishing&quot; protocol from <a href="/docs/latest/design/historical.html">Historical</a></li>
-<li>Segment load/drop protocol between <a href="/docs/latest/design/coordinator.html">Coordinator</a> and <a href="/docs/latest/design/historical.html">Historical</a></li>
-<li><a href="/docs/latest/design/overlord.html">Overlord</a> leader election</li>
-<li><a href="/docs/latest/design/overlord.html">Overlord</a> and <a href="/docs/latest/design/middlemanager.html">MiddleManager</a> task management</li>
+<li><a href="/docs/0.21.0/design/coordinator.html">Coordinator</a> leader election</li>
+<li>Segment &quot;publishing&quot; protocol from <a href="/docs/0.21.0/design/historical.html">Historical</a></li>
+<li>Segment load/drop protocol between <a href="/docs/0.21.0/design/coordinator.html">Coordinator</a> and <a href="/docs/0.21.0/design/historical.html">Historical</a></li>
+<li><a href="/docs/0.21.0/design/overlord.html">Overlord</a> leader election</li>
+<li><a href="/docs/0.21.0/design/overlord.html">Overlord</a> and <a href="/docs/0.21.0/design/middlemanager.html">MiddleManager</a> task management</li>
 </ol>
 <h2><a class="anchor" aria-hidden="true" id="coordinator-leader-election"></a><a href="#coordinator-leader-election" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 1 [...]
 <p>We use the Curator LeadershipLatch recipe to do leader election at path</p>
@@ -91,7 +91,7 @@
 </code></pre>
 <h2><a class="anchor" aria-hidden="true" id="segment-publishing-protocol-from-historical-and-realtime"></a><a href="#segment-publishing-protocol-from-historical-and-realtime" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.2 [...]
 <p>The <code>announcementsPath</code> and <code>servedSegmentsPath</code> are used for this.</p>
-<p>All <a href="/docs/latest/design/historical.html">Historical</a> processes publish themselves on the <code>announcementsPath</code>, specifically, they will create an ephemeral znode at</p>
+<p>All <a href="/docs/0.21.0/design/historical.html">Historical</a> processes publish themselves on the <code>announcementsPath</code>, specifically, they will create an ephemeral znode at</p>
 <pre><code class="hljs"><span class="hljs-variable">${druid.zk.paths.announcementsPath}</span>/<span class="hljs-variable">${druid.host}</span>
 </code></pre>
 <p>Which signifies that they exist. They will also subsequently create a permanent znode at</p>
@@ -100,14 +100,14 @@
 <p>And as they load up segments, they will attach ephemeral znodes that look like</p>
 <pre><code class="hljs"><span class="hljs-variable">${druid.zk.paths.servedSegmentsPath}</span><span class="hljs-regexp">/${druid.host}/</span>_segment_identifier_
 </code></pre>
-<p>Processes like the <a href="/docs/latest/design/coordinator.html">Coordinator</a> and <a href="/docs/latest/design/broker.html">Broker</a> can then watch these paths to see which processes are currently serving which segments.</p>
+<p>Processes like the <a href="/docs/0.21.0/design/coordinator.html">Coordinator</a> and <a href="/docs/0.21.0/design/broker.html">Broker</a> can then watch these paths to see which processes are currently serving which segments.</p>
 <h2><a class="anchor" aria-hidden="true" id="segment-loaddrop-protocol-between-coordinator-and-historical"></a><a href="#segment-loaddrop-protocol-between-coordinator-and-historical" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 [...]
 <p>The <code>loadQueuePath</code> is used for this.</p>
-<p>When the <a href="/docs/latest/design/coordinator.html">Coordinator</a> decides that a <a href="/docs/latest/design/historical.html">Historical</a> process should load or drop a segment, it writes an ephemeral znode to</p>
+<p>When the <a href="/docs/0.21.0/design/coordinator.html">Coordinator</a> decides that a <a href="/docs/0.21.0/design/historical.html">Historical</a> process should load or drop a segment, it writes an ephemeral znode to</p>
 <pre><code class="hljs"><span class="hljs-variable">${druid.zk.paths.loadQueuePath}</span><span class="hljs-regexp">/_host_of_historical_process/</span>_segment_identifier
 </code></pre>
 <p>This znode will contain a payload that indicates to the Historical process what it should do with the given segment. When the Historical process is done with the work, it will delete the znode in order to signify to the Coordinator that it is complete.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/dependencies/metadata-storage.html"><span class="arrow-prev">← </span><span>Metadata storage</span></a><a class="docs-next button" href="/docs/latest/ingestion/index.html"><span>Ingestion</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#coordinator-leader-election">Coordinator Leader Election</a></li><li><a href= [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/dependencies/metadata-storage.html"><span class="arrow-prev">← </span><span>Metadata storage</span></a><a class="docs-next button" href="/docs/0.21.0/ingestion/index.html"><span>Ingestion</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#coordinator-leader-election">Coordinator Leader Election</a></li><li><a href= [...]
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@@ -124,6 +124,6 @@
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                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/design/architecture.html b/docs/0.21.0/design/architecture.html
similarity index 67%
copy from docs/latest/design/architecture.html
copy to docs/0.21.0/design/architecture.html
index fdc0bd9..3cc11d1 100644
--- a/docs/latest/design/architecture.html
+++ b/docs/0.21.0/design/architecture.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Design · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/architecture.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.2" /><meta propert [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Design · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/design/architecture.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21.0" /><meta propert [...]
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               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
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             for (var i = 0; i < coll.length; i++) {
@@ -83,12 +83,12 @@ design also provides enhanced fault tolerance: an outage of one component will n
 <h2><a class="anchor" aria-hidden="true" id="processes-and-servers"></a><a href="#processes-and-servers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2 [...]
 <p>Druid has several process types, briefly described below:</p>
 <ul>
-<li><a href="/docs/latest/design/coordinator.html"><strong>Coordinator</strong></a> processes manage data availability on the cluster.</li>
-<li><a href="/docs/latest/design/overlord.html"><strong>Overlord</strong></a> processes control the assignment of data ingestion workloads.</li>
-<li><a href="/docs/latest/design/broker.html"><strong>Broker</strong></a> processes handle queries from external clients.</li>
-<li><a href="/docs/latest/design/router.html"><strong>Router</strong></a> processes are optional processes that can route requests to Brokers, Coordinators, and Overlords.</li>
-<li><a href="/docs/latest/design/historical.html"><strong>Historical</strong></a> processes store queryable data.</li>
-<li><a href="/docs/latest/design/middlemanager.html"><strong>MiddleManager</strong></a> processes are responsible for ingesting data.</li>
+<li><a href="/docs/0.21.0/design/coordinator.html"><strong>Coordinator</strong></a> processes manage data availability on the cluster.</li>
+<li><a href="/docs/0.21.0/design/overlord.html"><strong>Overlord</strong></a> processes control the assignment of data ingestion workloads.</li>
+<li><a href="/docs/0.21.0/design/broker.html"><strong>Broker</strong></a> processes handle queries from external clients.</li>
+<li><a href="/docs/0.21.0/design/router.html"><strong>Router</strong></a> processes are optional processes that can route requests to Brokers, Coordinators, and Overlords.</li>
+<li><a href="/docs/0.21.0/design/historical.html"><strong>Historical</strong></a> processes store queryable data.</li>
+<li><a href="/docs/0.21.0/design/middlemanager.html"><strong>MiddleManager</strong></a> processes are responsible for ingesting data.</li>
 </ul>
 <p>Druid processes can be deployed any way you like, but for ease of deployment we suggest organizing them into three server types: Master, Query, and Data.</p>
 <ul>
@@ -96,7 +96,7 @@ design also provides enhanced fault tolerance: an outage of one component will n
 <li><strong>Query</strong>: Runs Broker and optional Router processes, handles queries from external clients.</li>
 <li><strong>Data</strong>: Runs Historical and MiddleManager processes, executes ingestion workloads and stores all queryable data.</li>
 </ul>
-<p>For more details on process and server organization, please see <a href="/docs/latest/design/processes.html">Druid Processes and Servers</a>.</p>
+<p>For more details on process and server organization, please see <a href="/docs/0.21.0/design/processes.html">Druid Processes and Servers</a>.</p>
 <h2><a class="anchor" aria-hidden="true" id="external-dependencies"></a><a href="#external-dependencies" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2 [...]
 <p>In addition to its built-in process types, Druid also has three external dependencies. These are intended to be able to
 leverage existing infrastructure, where present.</p>
@@ -112,15 +112,15 @@ during a query, helping it offer the best query latencies possible. It also mean
 both in deep storage and across your Historical processes for the data you plan to load.</p>
 <p>Deep storage is an important part of Druid's elastic, fault-tolerant design. Druid can bootstrap from deep storage even
 if every single data server is lost and re-provisioned.</p>
-<p>For more details, please see the <a href="/docs/latest/dependencies/deep-storage.html">Deep storage</a> page.</p>
+<p>For more details, please see the <a href="/docs/0.21.0/dependencies/deep-storage.html">Deep storage</a> page.</p>
 <h3><a class="anchor" aria-hidden="true" id="metadata-storage"></a><a href="#metadata-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2. [...]
 <p>The metadata storage holds various shared system metadata such as segment usage information and task information. In a
 clustered deployment, this is typically going to be a traditional RDBMS like PostgreSQL or MySQL. In a single-server
 deployment, it is typically going to be a locally-stored Apache Derby database.</p>
-<p>For more details, please see the <a href="/docs/latest/dependencies/metadata-storage.html">Metadata storage</a> page.</p>
+<p>For more details, please see the <a href="/docs/0.21.0/dependencies/metadata-storage.html">Metadata storage</a> page.</p>
 <h3><a class="anchor" aria-hidden="true" id="zookeeper"></a><a href="#zookeeper" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.6 [...]
 <p>Used for internal service discovery, coordination, and leader election.</p>
-<p>For more details, please see the <a href="/docs/latest/dependencies/zookeeper.html">ZooKeeper</a> page.</p>
+<p>For more details, please see the <a href="/docs/0.21.0/dependencies/zookeeper.html">ZooKeeper</a> page.</p>
 <h2><a class="anchor" aria-hidden="true" id="architecture-diagram"></a><a href="#architecture-diagram" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1 [...]
 <p>The following diagram shows how queries and data flow through this architecture, using the suggested Master/Query/Data server organization:</p>
 <p><img src="../assets/druid-architecture.png" width="800"/></p>
@@ -129,7 +129,7 @@ deployment, it is typically going to be a locally-stored Apache Derby database.<
 <p>Druid data is stored in &quot;datasources&quot;, which are similar to tables in a traditional RDBMS. Each datasource is
 partitioned by time and, optionally, further partitioned by other attributes. Each time range is called a &quot;chunk&quot; (for
 example, a single day, if your datasource is partitioned by day). Within a chunk, data is partitioned into one or more
-<a href="/docs/latest/design/segments.html">&quot;segments&quot;</a>. Each segment is a single file, typically comprising up to a few million rows of data. Since segments are
+<a href="/docs/0.21.0/design/segments.html">&quot;segments&quot;</a>. Each segment is a single file, typically comprising up to a few million rows of data. Since segments are
 organized into time chunks, it's sometimes helpful to think of segments as living on a timeline like the following:</p>
 <p><img src="../assets/druid-timeline.png" width="800" /></p>
 <p>A datasource may have anywhere from just a few segments, up to hundreds of thousands and even millions of segments. Each
@@ -151,8 +151,8 @@ become immutable, and move from MiddleManagers to the Historical processes. An e
 to the <a href="#metadata-storage">metadata store</a>. This entry is a self-describing bit of metadata about the segment, including
 things like the schema of the segment, its size, and its location on deep storage. These entries are what the
 Coordinator uses to know what data <em>should</em> be available on the cluster.</p>
-<p>For details on the segment file format, please see <a href="segments.html">segment files</a>.</p>
-<p>For details on modeling your data in Druid, see <a href="/docs/latest/ingestion/schema-design.html">schema design</a>.</p>
+<p>For details on the segment file format, please see <a href="/docs/0.21.0/design/segments.html">segment files</a>.</p>
+<p>For details on modeling your data in Druid, see <a href="/docs/0.21.0/ingestion/schema-design.html">schema design</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="indexing-and-handoff"></a><a href="#indexing-and-handoff" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1 [...]
 <p><em>Indexing</em> is the mechanism by which new segments are created, and <em>handoff</em> is the mechanism by which they are published
 and begin being served by Historical processes. The mechanism works like this on the indexing side:</p>
@@ -209,7 +209,7 @@ new segments. Then it drops the old segments a few minutes later.</p>
 <p>Each segment has a lifecycle that involves the following three major areas:</p>
 <ol>
 <li><strong>Metadata store:</strong> Segment metadata (a small JSON payload generally no more than a few KB) is stored in the
-<a href="/docs/latest/dependencies/metadata-storage.html">metadata store</a> once a segment is done being constructed. The act of inserting
+<a href="/docs/0.21.0/dependencies/metadata-storage.html">metadata store</a> once a segment is done being constructed. The act of inserting
 a record for a segment into the metadata store is called <em>publishing</em>. These metadata records have a boolean flag
 named <code>used</code>, which controls whether the segment is intended to be queryable or not. Segments created by realtime tasks will be
 available before they are published, since they are only published when the segment is complete and will not accept
@@ -220,7 +220,7 @@ happens immediately before publishing metadata to the metadata store.</li>
 or a Historical process.</li>
 </ol>
 <p>You can inspect the state of currently active segments using the Druid SQL
-<a href="/docs/latest/querying/sql.html#segments-table"><code>sys.segments</code> table</a>. It includes the following flags:</p>
+<a href="/docs/0.21.0/querying/sql.html#segments-table"><code>sys.segments</code> table</a>. It includes the following flags:</p>
 <ul>
 <li><code>is_published</code>: True if segment metadata has been published to the metadata store and <code>used</code> is true.</li>
 <li><code>is_available</code>: True if the segment is currently available for querying, either on a realtime task or Historical
@@ -235,35 +235,35 @@ automatically set to false.</li>
 <p>Druid has an architectural separation between ingestion and querying, as described above in
 <a href="#indexing-and-handoff">Indexing and handoff</a>. This means that when understanding Druid's availability and
 consistency properties, we must look at each function separately.</p>
-<p>On the <strong>ingestion side</strong>, Druid's primary <a href="/docs/latest/ingestion/index.html#ingestion-methods">ingestion methods</a> are all
+<p>On the <strong>ingestion side</strong>, Druid's primary <a href="/docs/0.21.0/ingestion/index.html#ingestion-methods">ingestion methods</a> are all
 pull-based and offer transactional guarantees. This means that you are guaranteed that ingestion using these will
 publish in an all-or-nothing manner:</p>
 <ul>
-<li>Supervised &quot;seekable-stream&quot; ingestion methods like <a href="/docs/latest/development/extensions-core/kafka-ingestion.html">Kafka</a> and
-<a href="/docs/latest/development/extensions-core/kinesis-ingestion.html">Kinesis</a>. With these methods, Druid commits stream offsets to its
+<li>Supervised &quot;seekable-stream&quot; ingestion methods like <a href="/docs/0.21.0/development/extensions-core/kafka-ingestion.html">Kafka</a> and
+<a href="/docs/0.21.0/development/extensions-core/kinesis-ingestion.html">Kinesis</a>. With these methods, Druid commits stream offsets to its
 <a href="#metadata-storage">metadata store</a> alongside segment metadata, in the same transaction. Note that ingestion of data
 that has not yet been published can be rolled back if ingestion tasks fail. In this case, partially-ingested data is
 discarded, and Druid will resume ingestion from the last committed set of stream offsets. This ensures exactly-once
 publishing behavior.</li>
-<li><a href="../ingestion/hadoop.html">Hadoop-based batch ingestion</a>. Each task publishes all segment metadata in a single
+<li><a href="/docs/0.21.0/ingestion/hadoop.html">Hadoop-based batch ingestion</a>. Each task publishes all segment metadata in a single
 transaction.</li>
-<li><a href="../ingestion/native-batch.html">Native batch ingestion</a>. In parallel mode, the supervisor task publishes all segment
+<li><a href="/docs/0.21.0/ingestion/native-batch.html">Native batch ingestion</a>. In parallel mode, the supervisor task publishes all segment
 metadata in a single transaction after the subtasks are finished. In simple (single-task) mode, the single task
 publishes all segment metadata in a single transaction after it is complete.</li>
 </ul>
-<p><a href="/docs/latest/ingestion/tranquility.html">Tranquility</a>, a streaming ingestion method that is no longer recommended, does not perform
+<p><a href="/docs/0.21.0/ingestion/tranquility.html">Tranquility</a>, a streaming ingestion method that is no longer recommended, does not perform
 transactional loading.</p>
 <p>Additionally, some ingestion methods offer an <em>idempotency</em> guarantee. This means that repeated executions of the same
 ingestion will not cause duplicate data to be ingested:</p>
 <ul>
-<li>Supervised &quot;seekable-stream&quot; ingestion methods like <a href="/docs/latest/development/extensions-core/kafka-ingestion.html">Kafka</a> and
-<a href="/docs/latest/development/extensions-core/kinesis-ingestion.html">Kinesis</a> are idempotent due to the fact that stream offsets and
+<li>Supervised &quot;seekable-stream&quot; ingestion methods like <a href="/docs/0.21.0/development/extensions-core/kafka-ingestion.html">Kafka</a> and
+<a href="/docs/0.21.0/development/extensions-core/kinesis-ingestion.html">Kinesis</a> are idempotent due to the fact that stream offsets and
 segment metadata are stored together and updated in lock-step.</li>
-<li><a href="../ingestion/hadoop.html">Hadoop-based batch ingestion</a> is idempotent unless one of your input sources
+<li><a href="/docs/0.21.0/ingestion/hadoop.html">Hadoop-based batch ingestion</a> is idempotent unless one of your input sources
 is the same Druid datasource that you are ingesting into. In this case, running the same task twice is non-idempotent,
 because you are adding to existing data instead of overwriting it.</li>
-<li><a href="../ingestion/native-batch.html">Native batch ingestion</a> is idempotent unless
-<a href="../ingestion/native-batch.html"><code>appendToExisting</code></a> is true, or one of your input sources is the same Druid datasource
+<li><a href="/docs/0.21.0/ingestion/native-batch.html">Native batch ingestion</a> is idempotent unless
+<a href="/docs/0.21.0/ingestion/native-batch.html"><code>appendToExisting</code></a> is true, or one of your input sources is the same Druid datasource
 that you are ingesting into. In either of these two cases, running the same task twice is non-idempotent, because you
 are adding to existing data instead of overwriting it.</li>
 </ul>
@@ -281,7 +281,7 @@ must <em>all</em> be available before the Broker will use them instead of the ol
 per version per time chunk. Druid will also only use a single version at a time per time chunk. Together, these
 properties provide Druid's atomic replacement guarantees.</p>
 <p>Druid also supports an experimental <em>segment locking</em> mode that is activated by setting
-<a href="/docs/latest/ingestion/tasks.html#context"><code>forceTimeChunkLock</code></a> to false in the context of an ingestion task. In this case, Druid
+<a href="/docs/0.21.0/ingestion/tasks.html#context"><code>forceTimeChunkLock</code></a> to false in the context of an ingestion task. In this case, Druid
 creates an <em>atomic update group</em> using the existing version for the time chunk, instead of creating a new core set
 with a new version number. There can be multiple atomic update groups with the same version number per time chunk. Each
 one replaces a specific set of earlier segments in the same time chunk and with the same version number. Druid will
@@ -293,10 +293,10 @@ factor), then Druid queries will include only the segments that are still availa
 reload these unavailable segments on other Historicals as quickly as possible, at which point they will be included in
 queries again.</p>
 <h2><a class="anchor" aria-hidden="true" id="query-processing"></a><a href="#query-processing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2. [...]
-<p>Queries first enter the <a href="/docs/latest/design/broker.html">Broker</a>, where the Broker will identify which segments have data that may pertain to that query.
+<p>Queries first enter the <a href="/docs/0.21.0/design/broker.html">Broker</a>, where the Broker will identify which segments have data that may pertain to that query.
 The list of segments is always pruned by time, and may also be pruned by other attributes depending on how your
-datasource is partitioned. The Broker will then identify which <a href="/docs/latest/design/historical.html">Historicals</a> and
-<a href="/docs/latest/design/middlemanager.html">MiddleManagers</a> are serving those segments and send a rewritten subquery to each of those processes. The Historical/MiddleManager processes will take in the
+datasource is partitioned. The Broker will then identify which <a href="/docs/0.21.0/design/historical.html">Historicals</a> and
+<a href="/docs/0.21.0/design/middlemanager.html">MiddleManagers</a> are serving those segments and send a rewritten subquery to each of those processes. The Historical/MiddleManager processes will take in the
 queries, process them and return results. The Broker receives results and merges them together to get the final answer,
 which it returns to the original caller.</p>
 <p>Broker pruning is an important way that Druid limits the amount of data that must be scanned for each query, but it is
@@ -310,9 +310,9 @@ query. Within those columns, Druid can skip from row to row, avoiding reading da
 <li>Within each segment, using indexes to identify which rows must be accessed.</li>
 <li>Within each segment, only reading the specific rows and columns that are relevant to a particular query.</li>
 </ul>
-<p>For more details about how Druid executes queries, refer to the <a href="/docs/latest/querying/query-execution.html">Query execution</a>
+<p>For more details about how Druid executes queries, refer to the <a href="/docs/0.21.0/querying/query-execution.html">Query execution</a>
 documentation.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/tutorials/tutorial-kerberos-hadoop.html"><span class="arrow-prev">← </span><span>Kerberized HDFS deep storage</span></a><a class="docs-next button" href="/docs/latest/design/segments.html"><span>Segments</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#processes-and-servers">Processes and Servers</a></li><li><a h [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/tutorials/tutorial-kerberos-hadoop.html"><span class="arrow-prev">← </span><span>Kerberized HDFS deep storage</span></a><a class="docs-next button" href="/docs/0.21.0/design/segments.html"><span>Segments</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#processes-and-servers">Processes and Servers</a></li><li><a h [...]
                 document.addEventListener('keyup', function(e) {
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@@ -329,6 +329,6 @@ documentation.</p>
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                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
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             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/design/auth.html b/docs/0.21.0/design/auth.html
similarity index 67%
copy from docs/latest/design/auth.html
copy to docs/0.21.0/design/auth.html
index 8686dca..75f78b2 100644
--- a/docs/latest/design/auth.html
+++ b/docs/0.21.0/design/auth.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Authentication and Authorization · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/auth.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20. [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Authentication and Authorization · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/design/auth.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21. [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
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@@ -196,7 +196,7 @@ druid.auth.authorizer.&lt;authorizer-<span class="hljs-built_in">name</span>&gt;
 
 </code></pre>
 <p>These properties provide the authenticator and authorizer names to the implementations as @JsonProperty parameters, potentially useful when multiple authenticators or authorizers of the same type are configured.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/comparisons/druid-vs-sql-on-hadoop.html"><span class="arrow-prev">← </span><span>Apache Druid vs SQL-on-Hadoop</span></a><a class="docs-next button" href="/docs/latest/design/broker.html"><span>Broker</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#enabling-authenticationauthorizationloadinglookuptest">Enabling  [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/comparisons/druid-vs-sql-on-hadoop.html"><span class="arrow-prev">← </span><span>Apache Druid vs SQL-on-Hadoop</span></a><a class="docs-next button" href="/docs/0.21.0/design/broker.html"><span>Broker</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#enabling-authenticationauthorizationloadinglookuptest">Enabling  [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -213,6 +213,6 @@ druid.auth.authorizer.&lt;authorizer-<span class="hljs-built_in">name</span>&gt;
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/design/broker.html b/docs/0.21.0/design/broker.html
similarity index 52%
copy from docs/latest/design/broker.html
copy to docs/0.21.0/design/broker.html
index 712aa26..5f807f9 100644
--- a/docs/latest/design/broker.html
+++ b/docs/0.21.0/design/broker.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Broker · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/broker.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.2" /><meta property="og: [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Broker · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/design/broker.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21.0" /><meta property="og: [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
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@@ -78,9 +78,9 @@
   ~ under the License.
   -->
 <h3><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
-<p>For Apache Druid Broker Process Configuration, see <a href="../configuration/index.html#broker">Broker Configuration</a>.</p>
+<p>For Apache Druid Broker Process Configuration, see <a href="/docs/0.21.0/configuration/index.html#broker">Broker Configuration</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="http-endpoints"></a><a href="#http-endpoints" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0- [...]
-<p>For a list of API endpoints supported by the Broker, see <a href="../operations/api-reference.html#broker">Broker API</a>.</p>
+<p>For a list of API endpoints supported by the Broker, see <a href="/docs/0.21.0/operations/api-reference.html#broker">Broker API</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="overview"></a><a href="#overview" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64  [...]
 <p>The Broker is the process to route queries to if you want to run a distributed cluster. It understands the metadata published to ZooKeeper about what segments exist on what processes and routes queries such that they hit the right processes. This process also merges the result sets from all of the individual processes together.
 On start up, Historical processes announce themselves and the segments they are serving in Zookeeper.</p>
@@ -88,12 +88,12 @@ On start up, Historical processes announce themselves and the segments they are
 <pre><code class="hljs">org.apache.druid.cli.Main<span class="hljs-built_in"> server </span>broker
 </code></pre>
 <h3><a class="anchor" aria-hidden="true" id="forwarding-queries"></a><a href="#forwarding-queries" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22- [...]
-<p>Most Druid queries contain an interval object that indicates a span of time for which data is requested. Likewise, Druid <a href="/docs/latest/design/segments.html">Segments</a> are partitioned to contain data for some interval of time and segments are distributed across a cluster. Consider a simple datasource with 7 segments where each segment contains data for a given day of the week. Any query issued to the datasource for more than one day of data will hit more than one segment. Th [...]
-<p>To determine which processes to forward queries to, the Broker process first builds a view of the world from information in Zookeeper. Zookeeper maintains information about <a href="/docs/latest/design/historical.html">Historical</a> and streaming ingestion <a href="/docs/latest/design/peons.html">Peon</a> processes and the segments they are serving. For every datasource in Zookeeper, the Broker process builds a timeline of segments and the processes that serve them. When queries are  [...]
+<p>Most Druid queries contain an interval object that indicates a span of time for which data is requested. Likewise, Druid <a href="/docs/0.21.0/design/segments.html">Segments</a> are partitioned to contain data for some interval of time and segments are distributed across a cluster. Consider a simple datasource with 7 segments where each segment contains data for a given day of the week. Any query issued to the datasource for more than one day of data will hit more than one segment. Th [...]
+<p>To determine which processes to forward queries to, the Broker process first builds a view of the world from information in Zookeeper. Zookeeper maintains information about <a href="/docs/0.21.0/design/historical.html">Historical</a> and streaming ingestion <a href="/docs/0.21.0/design/peons.html">Peon</a> processes and the segments they are serving. For every datasource in Zookeeper, the Broker process builds a timeline of segments and the processes that serve them. When queries are  [...]
 <h3><a class="anchor" aria-hidden="true" id="caching"></a><a href="#caching" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1- [...]
 <p>Broker processes employ a cache with an LRU cache invalidation strategy. The Broker cache stores per-segment results. The cache can be local to each Broker process or shared across multiple processes using an external distributed cache such as <a href="http://memcached.org/">memcached</a>. Each time a broker process receives a query, it first maps the query to a set of segments. A subset of these segment results may already exist in the cache and the results can be directly pulled fro [...]
 Historical processes. Once the Historical processes return their results, the Broker will store those results in the cache. Real-time segments are never cached and hence requests for real-time data will always be forwarded to real-time processes. Real-time data is perpetually changing and caching the results would be unreliable.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/design/auth.html"><span class="arrow-prev">← </span><span>Authentication and Authorization</span></a><a class="docs-next button" href="/docs/latest/design/coordinator.html"><span>Coordinator Process</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-c [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/design/auth.html"><span class="arrow-prev">← </span><span>Authentication and Authorization</span></a><a class="docs-next button" href="/docs/0.21.0/design/coordinator.html"><span>Coordinator Process</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-c [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -110,6 +110,6 @@ Historical processes. Once the Historical processes return their results, the Br
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/design/concepts-and-terminology.html b/docs/0.21.0/design/concepts-and-terminology.html
new file mode 100644
index 0000000..eed33a4
--- /dev/null
+++ b/docs/0.21.0/design/concepts-and-terminology.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="index.html">
+<meta http-equiv="refresh" content="0; url=index.html">
+<h1>Redirecting...</h1>
+<a href="index.html">Click here if you are not redirected.</a>
+<script>location="index.html"</script>
diff --git a/docs/latest/design/coordinator.html b/docs/0.21.0/design/coordinator.html
similarity index 62%
copy from docs/latest/design/coordinator.html
copy to docs/0.21.0/design/coordinator.html
index 5d4299b..43cd3cf 100644
--- a/docs/latest/design/coordinator.html
+++ b/docs/0.21.0/design/coordinator.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Coordinator Process · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/coordinator.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.2" />< [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Coordinator Process · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/design/coordinator.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21.0" />< [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
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@@ -78,9 +78,9 @@
   ~ under the License.
   -->
 <h3><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
-<p>For Apache Druid Coordinator Process Configuration, see <a href="../configuration/index.html#coordinator">Coordinator Configuration</a>.</p>
+<p>For Apache Druid Coordinator Process Configuration, see <a href="/docs/0.21.0/configuration/index.html#coordinator">Coordinator Configuration</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="http-endpoints"></a><a href="#http-endpoints" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0- [...]
-<p>For a list of API endpoints supported by the Coordinator, see <a href="../operations/api-reference.html#coordinator">Coordinator API</a>.</p>
+<p>For a list of API endpoints supported by the Coordinator, see <a href="/docs/0.21.0/operations/api-reference.html#coordinator">Coordinator API</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="overview"></a><a href="#overview" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64  [...]
 <p>The Druid Coordinator process is primarily responsible for segment management and distribution. More specifically, the
 Druid Coordinator process communicates to Historical processes to load or drop segments based on configurations. The
@@ -102,7 +102,7 @@ the historical process will load the segment and begin servicing it.</p>
 <pre><code class="hljs">org.apache.druid.cli.Main<span class="hljs-built_in"> server </span>coordinator
 </code></pre>
 <h3><a class="anchor" aria-hidden="true" id="rules"></a><a href="#rules" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09 [...]
-<p>Segments can be automatically loaded and dropped from the cluster based on a set of rules. For more information on rules, see <a href="/docs/latest/operations/rule-configuration.html">Rule Configuration</a>.</p>
+<p>Segments can be automatically loaded and dropped from the cluster based on a set of rules. For more information on rules, see <a href="/docs/0.21.0/operations/rule-configuration.html">Rule Configuration</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="cleaning-up-segments"></a><a href="#cleaning-up-segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1 [...]
 <p>On each run, the Druid Coordinator compares the set of used segments in the database with the segments served by some
 Historical nodes in the cluster. Coordinator sends requests to Historical nodes to unload unused segments or segments
@@ -115,17 +115,17 @@ marked as unused. During the next Coordinator's run, they will be unloaded from
 <p>To ensure an even distribution of segments across Historical processes in the cluster, the Coordinator process will find the total size of all segments being served by every Historical process each time the Coordinator runs. For every Historical process tier in the cluster, the Coordinator process will determine the Historical process with the highest utilization and the Historical process with the lowest utilization. The percent difference in utilization between the two processes is  [...]
 <h3><a class="anchor" aria-hidden="true" id="compacting-segments"></a><a href="#compacting-segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.2 [...]
 <p>Each run, the Druid Coordinator compacts segments by merging small segments or splitting a large one. This is useful when your segments are not optimized
-in terms of segment size which may degrade query performance. See <a href="/docs/latest/operations/segment-optimization.html">Segment Size Optimization</a> for details.</p>
+in terms of segment size which may degrade query performance. See <a href="/docs/0.21.0/operations/segment-optimization.html">Segment Size Optimization</a> for details.</p>
 <p>The Coordinator first finds the segments to compact based on the <a href="#segment-search-policy">segment search policy</a>.
-Once some segments are found, it issues a <a href="/docs/latest/ingestion/tasks.html#compact">compaction task</a> to compact those segments.
+Once some segments are found, it issues a <a href="/docs/0.21.0/ingestion/tasks.html#compact">compaction task</a> to compact those segments.
 The maximum number of running compaction tasks is <code>min(sum of worker capacity * slotRatio, maxSlots)</code>.
 Note that even though <code>min(sum of worker capacity * slotRatio, maxSlots)</code> = 0, at least one compaction task is always submitted
 if the compaction is enabled for a dataSource.
-See <a href="../operations/api-reference.html#compaction-configuration">Compaction Configuration API</a> and <a href="../configuration/index.html#compaction-dynamic-configuration">Compaction Configuration</a> to enable the compaction.</p>
+See <a href="/docs/0.21.0/operations/api-reference.html#compaction-configuration">Compaction Configuration API</a> and <a href="/docs/0.21.0/configuration/index.html#compaction-dynamic-configuration">Compaction Configuration</a> to enable the compaction.</p>
 <p>Compaction tasks might fail due to the following reasons.</p>
 <ul>
 <li>If the input segments of a compaction task are removed or overshadowed before it starts, that compaction task fails immediately.</li>
-<li>If a task of a higher priority acquires a <a href="../ingestion/tasks.html#locking">time chunk lock</a> for an interval overlapping with the interval of a compaction task, the compaction task fails.</li>
+<li>If a task of a higher priority acquires a <a href="/docs/0.21.0/ingestion/tasks.html#locking">time chunk lock</a> for an interval overlapping with the interval of a compaction task, the compaction task fails.</li>
 </ul>
 <p>Once a compaction task fails, the Coordinator simply checks the segments in the interval of the failed task again, and issues another compaction task in the next run.</p>
 <h3><a class="anchor" aria-hidden="true" id="segment-search-policy"></a><a href="#segment-search-policy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2 [...]
@@ -157,17 +157,17 @@ A set of segments need compaction if all conditions below are satisfied.</p>
 <p>If the coordinator has enough task slots for compaction, this policy will continue searching for the next segments and return
 <code>bar_2017-10-01T00:00:00.000Z_2017-11-01T00:00:00.000Z_VERSION</code> and <code>bar_2017-10-01T00:00:00.000Z_2017-11-01T00:00:00.000Z_VERSION_1</code>.
 Finally, <code>foo_2017-09-01T00:00:00.000Z_2017-10-01T00:00:00.000Z_VERSION</code> will be picked up even though there is only one segment in the time chunk of <code>2017-09-01T00:00:00.000Z/2017-10-01T00:00:00.000Z</code>.</p>
-<p>The search start point can be changed by setting <a href="../configuration/index.html#compaction-dynamic-configuration">skipOffsetFromLatest</a>.
+<p>The search start point can be changed by setting <a href="/docs/0.21.0/configuration/index.html#compaction-dynamic-configuration">skipOffsetFromLatest</a>.
 If this is set, this policy will ignore the segments falling into the time chunk of (the end time of the most recent segment - <code>skipOffsetFromLatest</code>).
 This is to avoid conflicts between compaction tasks and realtime tasks.
 Note that realtime tasks have a higher priority than compaction tasks by default. Realtime tasks will revoke the locks of compaction tasks if their intervals overlap, resulting in the termination of the compaction task.</p>
 <blockquote>
 <p>This policy currently cannot handle the situation when there are a lot of small segments which have the same interval,
-and their total size exceeds <a href="/docs/latest/configuration/index.html#compaction-dynamic-configuration">inputSegmentSizeBytes</a>.
+and their total size exceeds <a href="/docs/0.21.0/configuration/index.html#compaction-dynamic-configuration">inputSegmentSizeBytes</a>.
 If it finds such segments, it simply skips them.</p>
 </blockquote>
 <h3><a class="anchor" aria-hidden="true" id="the-coordinator-console"></a><a href="#the-coordinator-console" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 [...]
-<p>The Druid Coordinator exposes a web GUI for displaying cluster information and rule configuration. For more details, please see <a href="../operations/management-uis.html#coordinator-consoles">coordinator console</a>.</p>
+<p>The Druid Coordinator exposes a web GUI for displaying cluster information and rule configuration. For more details, please see <a href="/docs/0.21.0/operations/management-uis.html#coordinator-consoles">coordinator console</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="faq"></a><a href="#faq" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.2 [...]
 <ol>
 <li><p><strong>Do clients ever contact the Coordinator process?</strong></p>
@@ -178,7 +178,7 @@ If it finds such segments, it simply skips them.</p>
 <p>No. If the Druid Coordinator is not started up, no new segments will be loaded in the cluster and outdated segments will not be dropped. However, the Coordinator process can be started up at any time, and after a configurable delay, will start running Coordinator tasks.</p>
 <p>This also means that if you have a working cluster and all of your Coordinators die, the cluster will continue to function, it just won’t experience any changes to its data topology.</p></li>
 </ol>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/design/broker.html"><span class="arrow-prev">← </span><span>Broker</span></a><a class="docs-next button" href="/docs/latest/design/historical.html"><span>Historical Process</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/techno [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/design/broker.html"><span class="arrow-prev">← </span><span>Broker</span></a><a class="docs-next button" href="/docs/0.21.0/design/historical.html"><span>Historical Process</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/techno [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -195,6 +195,6 @@ If it finds such segments, it simply skips them.</p>
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/design/design.html b/docs/0.21.0/design/design.html
new file mode 100644
index 0000000..eed33a4
--- /dev/null
+++ b/docs/0.21.0/design/design.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="index.html">
+<meta http-equiv="refresh" content="0; url=index.html">
+<h1>Redirecting...</h1>
+<a href="index.html">Click here if you are not redirected.</a>
+<script>location="index.html"</script>
diff --git a/docs/latest/design/extensions-contrib/dropwizard.html b/docs/0.21.0/design/extensions-contrib/dropwizard.html
similarity index 98%
copy from docs/latest/design/extensions-contrib/dropwizard.html
copy to docs/0.21.0/design/extensions-contrib/dropwizard.html
index 87debd9..3af8c2f 100644
--- a/docs/latest/design/extensions-contrib/dropwizard.html
+++ b/docs/0.21.0/design/extensions-contrib/dropwizard.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Dropwizard metrics emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/extensions-contrib/dropwizard.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:vers [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Dropwizard metrics emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/design/extensions-contrib/dropwizard.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:vers [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
   ~ Licensed to the Apache Software Foundation (ASF) under one
   ~ or more contributor license agreements.  See the NOTICE file
   ~ distributed with this work for additional information
@@ -22,7 +22,7 @@
   ~ under the License.
   -->
 <h1><a class="anchor" aria-hidden="true" id="dropwizard-emitter"></a><a href="#dropwizard-emitter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22- [...]
-<p>To use this extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>dropwizard-emitter</code> extension.</p>
+<p>To use this extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>dropwizard-emitter</code> extension.</p>
 <h2><a class="anchor" aria-hidden="true" id="introduction"></a><a href="#introduction" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83. [...]
 <p>This extension integrates <a href="http://metrics.dropwizard.io/3.1.0/getting-started/#">Dropwizard</a> metrics library with druid so that dropwizard users can easily absorb druid into their monitoring ecosystem.
 It accumulates druid metrics as dropwizard metrics, and emits them to various sinks via dropwizard supported reporters.
@@ -612,7 +612,7 @@ druid.emitter.dropwizard.reporters=[{<span class="hljs-string">"type"</span>:<sp
   }
 }
 </code></pre>
-</span></div></article></div><div class="docs-prevnext"></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#introduction">Introduction</a></li><li><a href="#configuration">Configuration</a><ul class="toc-headings"><li><a href="#druid-to-dropwizard-event-conversion">Druid to Dropwizard Event Conversion</a></li><li><a href="#supported-dropwizard-reporters">Supported Dropwizard reporters</a></li><li><a href="#default-metrics-mapping">Default Metrics Mapping</a></ [...]
+</span></div></article></div><div class="docs-prevnext"></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#introduction">Introduction</a></li><li><a href="#configuration">Configuration</a><ul class="toc-headings"><li><a href="#druid-to-dropwizard-event-conversion">Druid to Dropwizard Event Conversion</a></li><li><a href="#supported-dropwizard-reporters">Supported Dropwizard reporters</a></li><li><a href="#default-metrics-mapping">Default Metrics Mapping</a></ [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -629,6 +629,6 @@ druid.emitter.dropwizard.reporters=[{<span class="hljs-string">"type"</span>:<sp
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/design/historical.html b/docs/0.21.0/design/historical.html
similarity index 52%
copy from docs/latest/design/historical.html
copy to docs/0.21.0/design/historical.html
index 10de236..73fca6f 100644
--- a/docs/latest/design/historical.html
+++ b/docs/0.21.0/design/historical.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Historical Process · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/historical.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.2" /><me [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Historical Process · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/design/historical.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21.0" /><me [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -78,23 +78,23 @@
   ~ under the License.
   -->
 <h3><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
-<p>For Apache Druid Historical Process Configuration, see <a href="../configuration/index.html#historical">Historical Configuration</a>.</p>
+<p>For Apache Druid Historical Process Configuration, see <a href="/docs/0.21.0/configuration/index.html#historical">Historical Configuration</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="http-endpoints"></a><a href="#http-endpoints" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0- [...]
-<p>For a list of API endpoints supported by the Historical, please see the <a href="../operations/api-reference.html#historical">API reference</a>.</p>
+<p>For a list of API endpoints supported by the Historical, please see the <a href="/docs/0.21.0/operations/api-reference.html#historical">API reference</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="running"></a><a href="#running" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1- [...]
 <pre><code class="hljs">org.apache.druid.cli.Main<span class="hljs-built_in"> server </span>historical
 </code></pre>
 <h3><a class="anchor" aria-hidden="true" id="loading-and-serving-segments"></a><a href="#loading-and-serving-segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 [...]
 <p>Each Historical process maintains a constant connection to Zookeeper and watches a configurable set of Zookeeper paths for new segment information. Historical processes do not communicate directly with each other or with the Coordinator processes but instead rely on Zookeeper for coordination.</p>
-<p>The <a href="/docs/latest/design/coordinator.html">Coordinator</a> process is responsible for assigning new segments to Historical processes. Assignment is done by creating an ephemeral Zookeeper entry under a load queue path associated with a Historical process. For more information on how the Coordinator assigns segments to Historical processes, please see <a href="/docs/latest/design/coordinator.html">Coordinator</a>.</p>
-<p>When a Historical process notices a new load queue entry in its load queue path, it will first check a local disk directory (cache) for the information about segment. If no information about the segment exists in the cache, the Historical process will download metadata about the new segment to serve from Zookeeper. This metadata includes specifications about where the segment is located in deep storage and about how to decompress and process the segment. For more information about seg [...]
+<p>The <a href="/docs/0.21.0/design/coordinator.html">Coordinator</a> process is responsible for assigning new segments to Historical processes. Assignment is done by creating an ephemeral Zookeeper entry under a load queue path associated with a Historical process. For more information on how the Coordinator assigns segments to Historical processes, please see <a href="/docs/0.21.0/design/coordinator.html">Coordinator</a>.</p>
+<p>When a Historical process notices a new load queue entry in its load queue path, it will first check a local disk directory (cache) for the information about segment. If no information about the segment exists in the cache, the Historical process will download metadata about the new segment to serve from Zookeeper. This metadata includes specifications about where the segment is located in deep storage and about how to decompress and process the segment. For more information about seg [...]
 <h3><a class="anchor" aria-hidden="true" id="loading-and-serving-segments-from-cache"></a><a href="#loading-and-serving-segments-from-cache" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2  [...]
 <p>Recall that when a Historical process notices a new segment entry in its load queue path, the Historical process first checks a configurable cache directory on its local disk to see if the segment had been previously downloaded. If a local cache entry already exists, the Historical process will directly read the segment binary files from disk and load the segment.</p>
 <p>The segment cache is also leveraged when a Historical process is first started. On startup, a Historical process will search through its cache directory and immediately load and serve all segments that are found. This feature allows Historical processes to be queried as soon they come online.</p>
 <h3><a class="anchor" aria-hidden="true" id="querying-segments"></a><a href="#querying-segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2- [...]
-<p>Please see <a href="/docs/latest/querying/querying.html">Querying</a> for more information on querying Historical processes.</p>
+<p>Please see <a href="/docs/0.21.0/querying/querying.html">Querying</a> for more information on querying Historical processes.</p>
 <p>A Historical can be configured to log and report metrics for every query it services.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/design/coordinator.html"><span class="arrow-prev">← </span><span>Coordinator Process</span></a><a class="docs-next button" href="/docs/latest/design/indexer.html"><span>Indexer Process</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a h [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/design/coordinator.html"><span class="arrow-prev">← </span><span>Coordinator Process</span></a><a class="docs-next button" href="/docs/0.21.0/design/indexer.html"><span>Indexer Process</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a h [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -111,6 +111,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/design/index.html b/docs/0.21.0/design/index.html
similarity index 53%
copy from docs/latest/design/index.html
copy to docs/0.21.0/design/index.html
index ca59e5d..e194fb9 100644
--- a/docs/latest/design/index.html
+++ b/docs/0.21.0/design/index.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Introduction to Apache Druid · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/index.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.2"  [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Introduction to Apache Druid · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/design/index.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21.0"  [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -111,7 +111,7 @@ Druid servers fail, the system will automatically route around the damage until
 is designed to run 24/7 with no need for planned downtimes for any reason, including configuration changes and software
 updates.</li>
 <li><strong>Cloud-native, fault-tolerant architecture that won't lose data.</strong> Once Druid has ingested your data, a copy is
-stored safely in <a href="architecture.html#deep-storage">deep storage</a> (typically cloud storage, HDFS, or a shared filesystem).
+stored safely in <a href="/docs/0.21.0/design/architecture.html#deep-storage">deep storage</a> (typically cloud storage, HDFS, or a shared filesystem).
 Your data can be recovered from deep storage even if every single Druid server fails. For more limited failures affecting
 just a few Druid servers, replication ensures that queries are still possible while the system recovers.</li>
 <li><strong>Indexes for quick filtering.</strong> Druid uses <a href="https://roaringbitmap.org/">Roaring</a> or
@@ -150,7 +150,7 @@ background batch jobs).</li>
 <li>You want to do &quot;big&quot; joins (joining one big fact table to another big fact table) and you are okay with these queries
 taking a long time to complete.</li>
 </ul>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-next button" href="/docs/latest/tutorials/index.html"><span>Quickstart</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#what-is-druid">What is Druid?</a></li><li><a href="#when-should-i-use-druid">When should I use Druid?</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center" [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-next button" href="/docs/0.21.0/tutorials/index.html"><span>Quickstart</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#what-is-druid">What is Druid?</a></li><li><a href="#when-should-i-use-druid">When should I use Druid?</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center" [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -167,6 +167,6 @@ taking a long time to complete.</li>
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/design/indexer.html b/docs/0.21.0/design/indexer.html
similarity index 56%
copy from docs/latest/design/indexer.html
copy to docs/0.21.0/design/indexer.html
index 94e4c71..d68a07e 100644
--- a/docs/latest/design/indexer.html
+++ b/docs/0.21.0/design/indexer.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Indexer Process · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/indexer.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.2" /><meta pro [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Indexer Process · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/design/indexer.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21.0" /><meta pro [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -78,15 +78,15 @@
   ~ under the License.
   -->
 <blockquote>
-<p>The Indexer is an optional and <a href="../development/experimental.html">experimental</a> feature.
+<p>The Indexer is an optional and <a href="/docs/0.21.0/development/experimental.html">experimental</a> feature.
 Its memory management system is still under development and will be significantly enhanced in later releases.</p>
 </blockquote>
 <p>The Apache Druid Indexer process is an alternative to the MiddleManager + Peon task execution system. Instead of forking a separate JVM process per-task, the Indexer runs tasks as separate threads within a single JVM process.</p>
 <p>The Indexer is designed to be easier to configure and deploy compared to the MiddleManager + Peon system and to better enable resource sharing across tasks.</p>
 <h3><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
-<p>For Apache Druid Indexer Process Configuration, see <a href="../configuration/index.html#indexer">Indexer Configuration</a>.</p>
+<p>For Apache Druid Indexer Process Configuration, see <a href="/docs/0.21.0/configuration/index.html#indexer">Indexer Configuration</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="http-endpoints"></a><a href="#http-endpoints" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0- [...]
-<p>The Indexer process shares the same HTTP endpoints as the <a href="../operations/api-reference.html#middlemanager">MiddleManager</a>.</p>
+<p>The Indexer process shares the same HTTP endpoints as the <a href="/docs/0.21.0/operations/api-reference.html#middlemanager">MiddleManager</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="running"></a><a href="#running" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1- [...]
 <pre><code class="hljs">org.apache.druid.cli.Main<span class="hljs-built_in"> server </span>indexer
 </code></pre>
@@ -94,7 +94,7 @@ Its memory management system is still under development and will be significantl
 <p>The following resources are shared across all tasks running inside an Indexer process.</p>
 <h4><a class="anchor" aria-hidden="true" id="query-resources"></a><a href="#query-resources" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5  [...]
 <p>The query processing threads and buffers are shared across all tasks. The Indexer will serve queries from a single endpoint shared by all tasks.</p>
-<p>If <a href="../configuration/index.html#indexer-caching">query caching</a> is enabled, the query cache is also shared across all tasks.</p>
+<p>If <a href="/docs/0.21.0/configuration/index.html#indexer-caching">query caching</a> is enabled, the query cache is also shared across all tasks.</p>
 <h4><a class="anchor" aria-hidden="true" id="server-http-threads"></a><a href="#server-http-threads" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.2 [...]
 <p>The Indexer maintains two equally sized pools of HTTP threads.</p>
 <p>One pool is exclusively used for task control messages between the Overlord and the Indexer (&quot;chat handler threads&quot;). The other pool is used for handling all other HTTP requests.</p>
@@ -114,8 +114,9 @@ Its memory management system is still under development and will be significantl
 <h3><a class="anchor" aria-hidden="true" id="current-limitations"></a><a href="#current-limitations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.2 [...]
 <p>Separate task logs are not currently supported when using the Indexer; all task log messages will instead be logged in the Indexer process log.</p>
 <p>The Indexer currently imposes an identical memory limit on each task. In later releases, the per-task memory limit will be removed and only the global limit will apply. The limit on concurrent merges will also be removed.</p>
+<p>The Indexer does not work properly with <a href="/docs/0.21.0/ingestion/tasks.html#index_realtime"><code>index_realtime</code></a> task types. Therefore, it is not compatible with <a href="/docs/0.21.0/ingestion/tranquility.html">Tranquility</a>. If you are using Tranquility, consider migrating to Druid's builtin <a href="/docs/0.21.0/development/extensions-core/kafka-ingestion.html">Apache Kafka</a> or <a href="/docs/0.21.0/development/extensions-core/kinesis-ingestion.html">Amazon K [...]
 <p>In later releases, per-task memory usage will be dynamically managed. Please see <a href="https://github.com/apache/druid/issues/7900">https://github.com/apache/druid/issues/7900</a> for details on future enhancements to the Indexer.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/design/historical.html"><span class="arrow-prev">← </span><span>Historical Process</span></a><a class="docs-next button" href="/docs/latest/design/indexing-service.html"><span>Indexing Service</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center" [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/design/historical.html"><span class="arrow-prev">← </span><span>Historical Process</span></a><a class="docs-next button" href="/docs/0.21.0/design/indexing-service.html"><span>Indexing Service</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center" [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -132,6 +133,6 @@ Its memory management system is still under development and will be significantl
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/design/indexing-service.html b/docs/0.21.0/design/indexing-service.html
new file mode 100644
index 0000000..1d08be0
--- /dev/null
+++ b/docs/0.21.0/design/indexing-service.html
@@ -0,0 +1,113 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Indexing Service · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/design/indexing-service.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21.0" / [...]
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            var coll = document.getElementsByClassName('collapsible');
+            var checkActiveCategory = true;
+            for (var i = 0; i < coll.length; i++) {
+              var links = coll[i].nextElementSibling.getElementsByTagName('*');
+              if (checkActiveCategory){
+                for (var j = 0; j < links.length; j++) {
+                  if (links[j].classList.contains('navListItemActive')){
+                    coll[i].nextElementSibling.classList.toggle('hide');
+                    coll[i].childNodes[1].classList.toggle('rotate');
+                    checkActiveCategory = false;
+                    break;
+                  }
+                }
+              }
+
+              coll[i].addEventListener('click', function() {
+                var arrow = this.childNodes[1];
+                arrow.classList.toggle('rotate');
+                var content = this.nextElementSibling;
+                content.classList.toggle('hide');
+              });
+            }
+
+            document.addEventListener('DOMContentLoaded', function() {
+              createToggler('#navToggler', '#docsNav', 'docsSliderActive');
+              createToggler('#tocToggler', 'body', 'tocActive');
+
+              var headings = document.querySelector('.toc-headings');
+              headings && headings.addEventListener('click', function(event) {
+                var el = event.target;
+                while(el !== headings){
+                  if (el.tagName === 'A') {
+                    document.body.classList.remove('tocActive');
+                    break;
+                  } else{
+                    el = el.parentNode;
+                  }
+                }
+              }, false);
+
+              function createToggler(togglerSelector, targetSelector, className) {
+                var toggler = document.querySelector(togglerSelector);
+                var target = document.querySelector(targetSelector);
+
+                if (!toggler) {
+                  return;
+                }
+
+                toggler.onclick = function(event) {
+                  event.preventDefault();
+
+                  target.classList.toggle(className);
+                };
+              }
+            });
+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/design/indexing-service.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Indexing Service</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>The Apache Druid indexing service is a highly-available, distributed service that runs indexing related tasks.</p>
+<p>Indexing <a href="/docs/0.21.0/ingestion/tasks.html">tasks</a> create (and sometimes destroy) Druid <a href="/docs/0.21.0/design/segments.html">segments</a>. The indexing service has a master/slave like architecture.</p>
+<p>The indexing service is composed of three main components: a <a href="/docs/0.21.0/design/peons.html">Peon</a> component that can run a single task, a <a href="/docs/0.21.0/design/middlemanager.html">Middle Manager</a> component that manages Peons, and an <a href="/docs/0.21.0/design/overlord.html">Overlord</a> component that manages task distribution to MiddleManagers.
+Overlords and MiddleManagers may run on the same process or across multiple processes while MiddleManagers and Peons always run on the same process.</p>
+<p>Tasks are managed using API endpoints on the Overlord service. Please see <a href="/docs/0.21.0/operations/api-reference.html#tasks">Overlord Task API</a> for more information.</p>
+<p><img src="../assets/indexing_service.png" alt="Indexing Service" title="Indexing Service"></p>
+<h2><a class="anchor" aria-hidden="true" id="overlord"></a><a href="#overlord" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64  [...]
+<p>See <a href="/docs/0.21.0/design/overlord.html">Overlord</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="middle-managers"></a><a href="#middle-managers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5  [...]
+<p>See <a href="/docs/0.21.0/design/middlemanager.html">Middle Manager</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="peons"></a><a href="#peons" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09 [...]
+<p>See <a href="/docs/0.21.0/design/peons.html">Peon</a>.</p>
+<h2><a class="anchor" aria-hidden="true" id="tasks"></a><a href="#tasks" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09 [...]
+<p>See <a href="/docs/0.21.0/ingestion/tasks.html">Tasks</a>.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/design/indexer.html"><span class="arrow-prev">← </span><span>Indexer Process</span></a><a class="docs-next button" href="/docs/0.21.0/design/middlemanager.html"><span class="function-name-prevnext">MiddleManager Process</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#overlord">Overlord</a></li><li><a href="#midd [...]
+                document.addEventListener('keyup', function(e) {
+                  if (e.target !== document.body) {
+                    return;
+                  }
+                  // keyCode for '/' (slash)
+                  if (e.keyCode === 191) {
+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
+                apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
+                indexName: 'apache_druid',
+                inputSelector: '#search_input_react',
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
+              });
+            </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/design/middlemanager.html b/docs/0.21.0/design/middlemanager.html
new file mode 100644
index 0000000..cede265
--- /dev/null
+++ b/docs/0.21.0/design/middlemanager.html
@@ -0,0 +1,109 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>MiddleManager Process · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/design/middlemanager.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21.0" [...]
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            var coll = document.getElementsByClassName('collapsible');
+            var checkActiveCategory = true;
+            for (var i = 0; i < coll.length; i++) {
+              var links = coll[i].nextElementSibling.getElementsByTagName('*');
+              if (checkActiveCategory){
+                for (var j = 0; j < links.length; j++) {
+                  if (links[j].classList.contains('navListItemActive')){
+                    coll[i].nextElementSibling.classList.toggle('hide');
+                    coll[i].childNodes[1].classList.toggle('rotate');
+                    checkActiveCategory = false;
+                    break;
+                  }
+                }
+              }
+
+              coll[i].addEventListener('click', function() {
+                var arrow = this.childNodes[1];
+                arrow.classList.toggle('rotate');
+                var content = this.nextElementSibling;
+                content.classList.toggle('hide');
+              });
+            }
+
+            document.addEventListener('DOMContentLoaded', function() {
+              createToggler('#navToggler', '#docsNav', 'docsSliderActive');
+              createToggler('#tocToggler', 'body', 'tocActive');
+
+              var headings = document.querySelector('.toc-headings');
+              headings && headings.addEventListener('click', function(event) {
+                var el = event.target;
+                while(el !== headings){
+                  if (el.tagName === 'A') {
+                    document.body.classList.remove('tocActive');
+                    break;
+                  } else{
+                    el = el.parentNode;
+                  }
+                }
+              }, false);
+
+              function createToggler(togglerSelector, targetSelector, className) {
+                var toggler = document.querySelector(togglerSelector);
+                var target = document.querySelector(targetSelector);
+
+                if (!toggler) {
+                  return;
+                }
+
+                toggler.onclick = function(event) {
+                  event.preventDefault();
+
+                  target.classList.toggle(className);
+                };
+              }
+            });
+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/design/middlemanager.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">MiddleManager Process</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<h3><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
+<p>For Apache Druid MiddleManager Process Configuration, see <a href="/docs/0.21.0/configuration/index.html#middlemanager-and-peons">Indexing Service Configuration</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="http-endpoints"></a><a href="#http-endpoints" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0- [...]
+<p>For a list of API endpoints supported by the MiddleManager, please see the <a href="/docs/0.21.0/operations/api-reference.html#middlemanager">API reference</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="overview"></a><a href="#overview" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64  [...]
+<p>The MiddleManager process is a worker process that executes submitted tasks. Middle Managers forward tasks to Peons that run in separate JVMs.
+The reason we have separate JVMs for tasks is for resource and log isolation. Each <a href="/docs/0.21.0/design/peons.html">Peon</a> is capable of running only one task at a time, however, a MiddleManager may have multiple Peons.</p>
+<h3><a class="anchor" aria-hidden="true" id="running"></a><a href="#running" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1- [...]
+<pre><code class="hljs">org.apache.druid.cli.Main<span class="hljs-built_in"> server </span>middleManager
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/design/indexing-service.html"><span class="arrow-prev">← </span><span>Indexing Service</span></a><a class="docs-next button" href="/docs/0.21.0/design/overlord.html"><span>Overlord Process</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p> [...]
+                document.addEventListener('keyup', function(e) {
+                  if (e.target !== document.body) {
+                    return;
+                  }
+                  // keyCode for '/' (slash)
+                  if (e.keyCode === 191) {
+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
+                apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
+                indexName: 'apache_druid',
+                inputSelector: '#search_input_react',
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
+              });
+            </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/design/overlord.html b/docs/0.21.0/design/overlord.html
similarity index 53%
copy from docs/latest/design/overlord.html
copy to docs/0.21.0/design/overlord.html
index cd4d396..796a835 100644
--- a/docs/latest/design/overlord.html
+++ b/docs/0.21.0/design/overlord.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Overlord Process · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/overlord.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.2" /><meta p [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Overlord Process · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/design/overlord.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21.0" /><meta p [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -78,16 +78,16 @@
   ~ under the License.
   -->
 <h3><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
-<p>For Apache Druid Overlord Process Configuration, see <a href="../configuration/index.html#overlord">Overlord Configuration</a>.</p>
+<p>For Apache Druid Overlord Process Configuration, see <a href="/docs/0.21.0/configuration/index.html#overlord">Overlord Configuration</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="http-endpoints"></a><a href="#http-endpoints" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0- [...]
-<p>For a list of API endpoints supported by the Overlord, please see the <a href="../operations/api-reference.html#overlord">API reference</a>.</p>
+<p>For a list of API endpoints supported by the Overlord, please see the <a href="/docs/0.21.0/operations/api-reference.html#overlord">API reference</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="overview"></a><a href="#overview" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64  [...]
 <p>The Overlord process is responsible for accepting tasks, coordinating task distribution, creating locks around tasks, and returning statuses to callers. Overlord can be configured to run in one of two modes - local or remote (local being default).
 In local mode Overlord is also responsible for creating Peons for executing tasks. When running the Overlord in local mode, all MiddleManager and Peon configurations must be provided as well.
 Local mode is typically used for simple workflows.  In remote mode, the Overlord and MiddleManager are run in separate processes and you can run each on a different server.
 This mode is recommended if you intend to use the indexing service as the single endpoint for all Druid indexing.</p>
 <h3><a class="anchor" aria-hidden="true" id="overlord-console"></a><a href="#overlord-console" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2. [...]
-<p>The Overlord provides a UI for managing tasks and workers. For more details, please see <a href="../operations/management-uis.html#overlord-console">overlord console</a>.</p>
+<p>The Overlord provides a UI for managing tasks and workers. For more details, please see <a href="/docs/0.21.0/operations/management-uis.html#overlord-console">overlord console</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="blacklisted-workers"></a><a href="#blacklisted-workers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.2 [...]
 <p>If a MiddleManager has task failures above a threshold, the Overlord will blacklist these MiddleManagers. No more than 20% of the MiddleManagers can be blacklisted. Blacklisted MiddleManagers will be periodically whitelisted.</p>
 <p>The following variables can be used to set the threshold and blacklist timeouts.</p>
@@ -99,7 +99,7 @@ This mode is recommended if you intend to use the indexing service as the single
 <h3><a class="anchor" aria-hidden="true" id="autoscaling"></a><a href="#autoscaling" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42 [...]
 <p>The Autoscaling mechanisms currently in place are tightly coupled with our deployment infrastructure but the framework should be in place for other implementations. We are highly open to new implementations or extensions of the existing mechanisms. In our own deployments, MiddleManager processes are Amazon AWS EC2 nodes and they are provisioned to register themselves in a <a href="https://github.com/ning/galaxy">galaxy</a> environment.</p>
 <p>If autoscaling is enabled, new MiddleManagers may be added when a task has been in pending state for too long. MiddleManagers may be terminated if they have not run any tasks for a period of time.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/design/middlemanager.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">MiddleManager Process</span></a><a class="docs-next button" href="/docs/latest/design/router.html"><span>Router Process</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container" [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/design/middlemanager.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">MiddleManager Process</span></a><a class="docs-next button" href="/docs/0.21.0/design/router.html"><span>Router Process</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container" [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -116,6 +116,6 @@ This mode is recommended if you intend to use the indexing service as the single
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/design/peons.html b/docs/0.21.0/design/peons.html
new file mode 100644
index 0000000..ea63432
--- /dev/null
+++ b/docs/0.21.0/design/peons.html
@@ -0,0 +1,111 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Peons · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/design/peons.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21.0" /><meta property="og:ti [...]
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            var coll = document.getElementsByClassName('collapsible');
+            var checkActiveCategory = true;
+            for (var i = 0; i < coll.length; i++) {
+              var links = coll[i].nextElementSibling.getElementsByTagName('*');
+              if (checkActiveCategory){
+                for (var j = 0; j < links.length; j++) {
+                  if (links[j].classList.contains('navListItemActive')){
+                    coll[i].nextElementSibling.classList.toggle('hide');
+                    coll[i].childNodes[1].classList.toggle('rotate');
+                    checkActiveCategory = false;
+                    break;
+                  }
+                }
+              }
+
+              coll[i].addEventListener('click', function() {
+                var arrow = this.childNodes[1];
+                arrow.classList.toggle('rotate');
+                var content = this.nextElementSibling;
+                content.classList.toggle('hide');
+              });
+            }
+
+            document.addEventListener('DOMContentLoaded', function() {
+              createToggler('#navToggler', '#docsNav', 'docsSliderActive');
+              createToggler('#tocToggler', 'body', 'tocActive');
+
+              var headings = document.querySelector('.toc-headings');
+              headings && headings.addEventListener('click', function(event) {
+                var el = event.target;
+                while(el !== headings){
+                  if (el.tagName === 'A') {
+                    document.body.classList.remove('tocActive');
+                    break;
+                  } else{
+                    el = el.parentNode;
+                  }
+                }
+              }, false);
+
+              function createToggler(togglerSelector, targetSelector, className) {
+                var toggler = document.querySelector(togglerSelector);
+                var target = document.querySelector(targetSelector);
+
+                if (!toggler) {
+                  return;
+                }
+
+                toggler.onclick = function(event) {
+                  event.preventDefault();
+
+                  target.classList.toggle(className);
+                };
+              }
+            });
+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/design/peons.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Peons</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<h3><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
+<p>For Apache Druid Peon Configuration, see <a href="/docs/0.21.0/configuration/index.html#peon-query-configuration">Peon Query Configuration</a> and <a href="/docs/0.21.0/configuration/index.html#additional-peon-configuration">Additional Peon Configuration</a>.</p>
+<h3><a class="anchor" aria-hidden="true" id="http-endpoints"></a><a href="#http-endpoints" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0- [...]
+<p>For a list of API endpoints supported by the Peon, please see the <a href="/docs/0.21.0/operations/api-reference.html#peon">Peon API reference</a>.</p>
+<p>Peons run a single task in a single JVM. MiddleManager is responsible for creating Peons for running tasks.
+Peons should rarely (if ever for testing purposes) be run on their own.</p>
+<h3><a class="anchor" aria-hidden="true" id="running"></a><a href="#running" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1- [...]
+<p>The Peon should very rarely ever be run independent of the MiddleManager unless for development purposes.</p>
+<pre><code class="hljs"><span class="hljs-selector-tag">org</span><span class="hljs-selector-class">.apache</span><span class="hljs-selector-class">.druid</span><span class="hljs-selector-class">.cli</span><span class="hljs-selector-class">.Main</span> <span class="hljs-selector-tag">internal</span> <span class="hljs-selector-tag">peon</span> &lt;<span class="hljs-selector-tag">task_file</span>&gt; &lt;<span class="hljs-selector-tag">status_file</span>&gt;
+</code></pre>
+<p>The task file contains the task JSON object.
+The status file indicates where the task status will be output.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/design/router.html"><span class="arrow-prev">← </span><span>Router Process</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/approximate-histograms.html"><span>Approximate Histogram aggregators</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class= [...]
+                document.addEventListener('keyup', function(e) {
+                  if (e.target !== document.body) {
+                    return;
+                  }
+                  // keyCode for '/' (slash)
+                  if (e.keyCode === 191) {
+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
+                apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
+                indexName: 'apache_druid',
+                inputSelector: '#search_input_react',
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
+              });
+            </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/design/plumber.html b/docs/0.21.0/design/plumber.html
new file mode 100644
index 0000000..2f57fca
--- /dev/null
+++ b/docs/0.21.0/design/plumber.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../ingestion/standalone-realtime.html">
+<meta http-equiv="refresh" content="0; url=../ingestion/standalone-realtime.html">
+<h1>Redirecting...</h1>
+<a href="../ingestion/standalone-realtime.html">Click here if you are not redirected.</a>
+<script>location="../ingestion/standalone-realtime.html"</script>
diff --git a/docs/latest/design/processes.html b/docs/0.21.0/design/processes.html
similarity index 61%
copy from docs/latest/design/processes.html
copy to docs/0.21.0/design/processes.html
index 0b9a510..77c2dd2 100644
--- a/docs/latest/design/processes.html
+++ b/docs/0.21.0/design/processes.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Processes and servers · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/processes.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.2" />< [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Processes and servers · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/design/processes.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21.0" />< [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -80,13 +80,13 @@
 <h2><a class="anchor" aria-hidden="true" id="process-types"></a><a href="#process-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
 <p>Druid has several process types:</p>
 <ul>
-<li><a href="/docs/latest/design/coordinator.html">Coordinator</a></li>
-<li><a href="/docs/latest/design/overlord.html">Overlord</a></li>
-<li><a href="/docs/latest/design/broker.html">Broker</a></li>
-<li><a href="/docs/latest/design/historical.html">Historical</a></li>
-<li><a href="/docs/latest/design/middlemanager.html">MiddleManager</a> and <a href="/docs/latest/design/peons.html">Peons</a></li>
-<li><a href="/docs/latest/design/indexer.html">Indexer (Optional)</a></li>
-<li><a href="/docs/latest/design/router.html">Router (Optional)</a></li>
+<li><a href="/docs/0.21.0/design/coordinator.html">Coordinator</a></li>
+<li><a href="/docs/0.21.0/design/overlord.html">Overlord</a></li>
+<li><a href="/docs/0.21.0/design/broker.html">Broker</a></li>
+<li><a href="/docs/0.21.0/design/historical.html">Historical</a></li>
+<li><a href="/docs/0.21.0/design/middlemanager.html">MiddleManager</a> and <a href="/docs/0.21.0/design/peons.html">Peons</a></li>
+<li><a href="/docs/0.21.0/design/indexer.html">Indexer (Optional)</a></li>
+<li><a href="/docs/0.21.0/design/router.html">Router (Optional)</a></li>
 </ul>
 <h2><a class="anchor" aria-hidden="true" id="server-types"></a><a href="#server-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83. [...]
 <p>Druid processes can be deployed any way you like, but for ease of deployment we suggest organizing them into three server types:</p>
@@ -101,38 +101,38 @@
 <p>A Master server manages data ingestion and availability: it is responsible for starting new ingestion jobs and coordinating availability of data on the &quot;Data servers&quot; described below.</p>
 <p>Within a Master server, functionality is split between two processes, the Coordinator and Overlord.</p>
 <h4><a class="anchor" aria-hidden="true" id="coordinator-process"></a><a href="#coordinator-process" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.2 [...]
-<p><a href="/docs/latest/design/coordinator.html"><strong>Coordinator</strong></a> processes watch over the Historical processes on the Data servers. They are responsible for assigning segments to specific servers, and for ensuring segments are well-balanced across Historicals.</p>
+<p><a href="/docs/0.21.0/design/coordinator.html"><strong>Coordinator</strong></a> processes watch over the Historical processes on the Data servers. They are responsible for assigning segments to specific servers, and for ensuring segments are well-balanced across Historicals.</p>
 <h4><a class="anchor" aria-hidden="true" id="overlord-process"></a><a href="#overlord-process" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2. [...]
-<p><a href="/docs/latest/design/overlord.html"><strong>Overlord</strong></a> processes watch over the MiddleManager processes on the Data servers and are the controllers of data ingestion into Druid. They are responsible for assigning ingestion tasks to MiddleManagers and for coordinating segment publishing.</p>
+<p><a href="/docs/0.21.0/design/overlord.html"><strong>Overlord</strong></a> processes watch over the MiddleManager processes on the Data servers and are the controllers of data ingestion into Druid. They are responsible for assigning ingestion tasks to MiddleManagers and for coordinating segment publishing.</p>
 <h3><a class="anchor" aria-hidden="true" id="query-server"></a><a href="#query-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83. [...]
 <p>A Query server provides the endpoints that users and client applications interact with, routing queries to Data servers or other Query servers (and optionally proxied Master server requests as well).</p>
 <p>Within a Query server, functionality is split between two processes, the Broker and Router.</p>
 <h4><a class="anchor" aria-hidden="true" id="broker-process"></a><a href="#broker-process" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0- [...]
-<p><a href="/docs/latest/design/broker.html"><strong>Broker</strong></a> processes receive queries from external clients and forward those queries to Data servers. When Brokers receive results from those subqueries, they merge those results and return them to the
+<p><a href="/docs/0.21.0/design/broker.html"><strong>Broker</strong></a> processes receive queries from external clients and forward those queries to Data servers. When Brokers receive results from those subqueries, they merge those results and return them to the
 caller. End users typically query Brokers rather than querying Historicals or MiddleManagers processes on Data servers directly.</p>
 <h4><a class="anchor" aria-hidden="true" id="router-process-optional"></a><a href="#router-process-optional" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 [...]
-<p><a href="/docs/latest/design/router.html"><strong>Router</strong></a> processes are <em>optional</em> processes that provide a unified API gateway in front of Druid Brokers,
+<p><a href="/docs/0.21.0/design/router.html"><strong>Router</strong></a> processes are <em>optional</em> processes that provide a unified API gateway in front of Druid Brokers,
 Overlords, and Coordinators. They are optional since you can also simply contact the Druid Brokers, Overlords, and
 Coordinators directly.</p>
-<p>The Router also runs the <a href="/docs/latest/operations/druid-console.html">Druid Console</a>, a management UI for datasources, segments, tasks, data processes (Historicals and MiddleManagers), and coordinator dynamic configuration. The user can also run SQL and native Druid queries within the console.</p>
+<p>The Router also runs the <a href="/docs/0.21.0/operations/druid-console.html">Druid Console</a>, a management UI for datasources, segments, tasks, data processes (Historicals and MiddleManagers), and coordinator dynamic configuration. The user can also run SQL and native Druid queries within the console.</p>
 <h3><a class="anchor" aria-hidden="true" id="data-server"></a><a href="#data-server" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42 [...]
 <p>A Data server executes ingestion jobs and stores queryable data.</p>
 <p>Within a Data server, functionality is split between two processes, the Historical and MiddleManager.</p>
 <h3><a class="anchor" aria-hidden="true" id="historical-process"></a><a href="#historical-process" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22- [...]
-<p><a href="/docs/latest/design/historical.html"><strong>Historical</strong></a> processes are the workhorses that handle storage and querying on &quot;historical&quot; data
+<p><a href="/docs/0.21.0/design/historical.html"><strong>Historical</strong></a> processes are the workhorses that handle storage and querying on &quot;historical&quot; data
 (including any streaming data that has been in the system long enough to be committed). Historical processes
 download segments from deep storage and respond to queries about these segments. They don't accept writes.</p>
 <h3><a class="anchor" aria-hidden="true" id="middle-manager-process"></a><a href="#middle-manager-process" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0 [...]
-<p><a href="/docs/latest/design/middlemanager.html"><strong>MiddleManager</strong></a> processes handle ingestion of new data into the cluster. They are responsible
+<p><a href="/docs/0.21.0/design/middlemanager.html"><strong>MiddleManager</strong></a> processes handle ingestion of new data into the cluster. They are responsible
 for reading from external data sources and publishing new Druid segments.</p>
 <h4><a class="anchor" aria-hidden="true" id="peon-processes"></a><a href="#peon-processes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0- [...]
-<p><a href="/docs/latest/design/peons.html"><strong>Peon</strong></a> processes are task execution engines spawned by MiddleManagers. Each Peon runs a separate JVM and is responsible for executing a single task. Peons always run on the same host as the MiddleManager that spawned them.</p>
+<p><a href="/docs/0.21.0/design/peons.html"><strong>Peon</strong></a> processes are task execution engines spawned by MiddleManagers. Each Peon runs a separate JVM and is responsible for executing a single task. Peons always run on the same host as the MiddleManager that spawned them.</p>
 <h3><a class="anchor" aria-hidden="true" id="indexer-process-optional"></a><a href="#indexer-process-optional" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-. [...]
-<p><a href="/docs/latest/design/indexer.html"><strong>Indexer</strong></a> processes are an alternative to MiddleManagers and Peons. Instead of
+<p><a href="/docs/0.21.0/design/indexer.html"><strong>Indexer</strong></a> processes are an alternative to MiddleManagers and Peons. Instead of
 forking separate JVM processes per-task, the Indexer runs tasks as individual threads within a single JVM process.</p>
 <p>The Indexer is designed to be easier to configure and deploy compared to the MiddleManager + Peon system and to
 better enable resource sharing across tasks. The Indexer is a newer feature and is currently designated
-<a href="/docs/latest/development/experimental.html">experimental</a> due to the fact that its memory management system is still under
+<a href="/docs/0.21.0/development/experimental.html">experimental</a> due to the fact that its memory management system is still under
 development. It will continue to mature in future versions of Druid.</p>
 <p>Typically, you would deploy either MiddleManagers or Indexers, but not both.</p>
 <h2><a class="anchor" aria-hidden="true" id="pros-and-cons-of-colocation"></a><a href="#pros-and-cons-of-colocation" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 1 [...]
@@ -147,11 +147,11 @@ such that they run on individual servers to avoid resource contention.</p>
 <p>In clusters with very high segment counts, it can make sense to separate the Coordinator and Overlord processes to provide more resources for the Coordinator's segment balancing workload.</p>
 <h4><a class="anchor" aria-hidden="true" id="unified-process"></a><a href="#unified-process" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5  [...]
 <p>The Coordinator and Overlord processes can be run as a single combined process by setting the <code>druid.coordinator.asOverlord.enabled</code> property.</p>
-<p>Please see <a href="../configuration/index.html#coordinator-operation">Coordinator Configuration: Operation</a> for details.</p>
+<p>Please see <a href="/docs/0.21.0/configuration/index.html#coordinator-operation">Coordinator Configuration: Operation</a> for details.</p>
 <h3><a class="anchor" aria-hidden="true" id="historicals-and-middlemanagers"></a><a href="#historicals-and-middlemanagers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 1 [...]
 <p>With higher levels of ingestion or query load, it can make sense to deploy the Historical and MiddleManager processes on separate hosts to to avoid CPU and memory contention.</p>
 <p>The Historical also benefits from having free memory for memory mapped segments, which can be another reason to deploy the Historical and MiddleManager processes separately.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/design/segments.html"><span class="arrow-prev">← </span><span>Segments</span></a><a class="docs-next button" href="/docs/latest/dependencies/deep-storage.html"><span>Deep storage</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#process-types">Process types</a></li><li><a href="#server-types">Server types</a><ul c [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/design/segments.html"><span class="arrow-prev">← </span><span>Segments</span></a><a class="docs-next button" href="/docs/0.21.0/dependencies/deep-storage.html"><span>Deep storage</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#process-types">Process types</a></li><li><a href="#server-types">Server types</a><ul c [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -168,6 +168,6 @@ such that they run on individual servers to avoid resource contention.</p>
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/design/realtime.html b/docs/0.21.0/design/realtime.html
new file mode 100644
index 0000000..2f57fca
--- /dev/null
+++ b/docs/0.21.0/design/realtime.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../ingestion/standalone-realtime.html">
+<meta http-equiv="refresh" content="0; url=../ingestion/standalone-realtime.html">
+<h1>Redirecting...</h1>
+<a href="../ingestion/standalone-realtime.html">Click here if you are not redirected.</a>
+<script>location="../ingestion/standalone-realtime.html"</script>
diff --git a/docs/latest/design/router.html b/docs/0.21.0/design/router.html
similarity index 65%
copy from docs/latest/design/router.html
copy to docs/0.21.0/design/router.html
index f221126..a32c0ed 100644
--- a/docs/latest/design/router.html
+++ b/docs/0.21.0/design/router.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Router Process · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/router.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.2" /><meta prope [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Router Process · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/design/router.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21.0" /><meta prope [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -78,16 +78,16 @@
   ~ under the License.
   -->
 <blockquote>
-<p>The Router is an optional and <a href="/docs/latest/development/experimental.html">experimental</a> feature due to the fact that its recommended place in the Druid cluster architecture is still evolving.
-However, it has been battle-tested in production, and it hosts the powerful <a href="/docs/latest/operations/druid-console.html">Druid Console</a>, so you should feel safe deploying it.</p>
+<p>The Router is an optional and <a href="/docs/0.21.0/development/experimental.html">experimental</a> feature due to the fact that its recommended place in the Druid cluster architecture is still evolving.
+However, it has been battle-tested in production, and it hosts the powerful <a href="/docs/0.21.0/operations/druid-console.html">Druid Console</a>, so you should feel safe deploying it.</p>
 </blockquote>
-<p>The Apache Druid Router process can be used to route queries to different Broker processes. By default, the broker routes queries based on how <a href="/docs/latest/operations/rule-configuration.html">Rules</a> are set up. For example, if 1 month of recent data is loaded into a <code>hot</code> cluster, queries that fall within the recent month can be routed to a dedicated set of brokers. Queries outside this range are routed to another set of brokers. This set up provides query isola [...]
+<p>The Apache Druid Router process can be used to route queries to different Broker processes. By default, the broker routes queries based on how <a href="/docs/0.21.0/operations/rule-configuration.html">Rules</a> are set up. For example, if 1 month of recent data is loaded into a <code>hot</code> cluster, queries that fall within the recent month can be routed to a dedicated set of brokers. Queries outside this range are routed to another set of brokers. This set up provides query isola [...]
 <p>For query routing purposes, you should only ever need the Router process if you have a Druid cluster well into the terabyte range.</p>
-<p>In addition to query routing, the Router also runs the <a href="/docs/latest/operations/druid-console.html">Druid Console</a>, a management UI for datasources, segments, tasks, data processes (Historicals and MiddleManagers), and coordinator dynamic configuration. The user can also run SQL and native Druid queries within the console.</p>
+<p>In addition to query routing, the Router also runs the <a href="/docs/0.21.0/operations/druid-console.html">Druid Console</a>, a management UI for datasources, segments, tasks, data processes (Historicals and MiddleManagers), and coordinator dynamic configuration. The user can also run SQL and native Druid queries within the console.</p>
 <h3><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
-<p>For Apache Druid Router Process Configuration, see <a href="../configuration/index.html#router">Router Configuration</a>.</p>
+<p>For Apache Druid Router Process Configuration, see <a href="/docs/0.21.0/configuration/index.html#router">Router Configuration</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="http-endpoints"></a><a href="#http-endpoints" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0- [...]
-<p>For a list of API endpoints supported by the Router, see <a href="../operations/api-reference.html#router">Router API</a>.</p>
+<p>For a list of API endpoints supported by the Router, see <a href="/docs/0.21.0/operations/api-reference.html#router">Router API</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="running"></a><a href="#running" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1- [...]
 <pre><code class="hljs">org.apache.druid.cli.Main<span class="hljs-built_in"> server </span>router
 </code></pre>
@@ -147,7 +147,7 @@ processes, so explicit routing needs to be used to indicate the proxy destinatio
 }
 </code></pre>
 <blockquote>
-<p>JavaScript-based functionality is disabled by default. Please refer to the Druid <a href="/docs/latest/development/javascript.html">JavaScript programming guide</a> for guidelines about using Druid's JavaScript functionality, including instructions on how to enable it.</p>
+<p>JavaScript-based functionality is disabled by default. Please refer to the Druid <a href="/docs/0.21.0/development/javascript.html">JavaScript programming guide</a> for guidelines about using Druid's JavaScript functionality, including instructions on how to enable it.</p>
 </blockquote>
 <h3><a class="anchor" aria-hidden="true" id="avatica-query-balancing"></a><a href="#avatica-query-balancing" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 [...]
 <p>All Avatica JDBC requests with a given connection ID must be routed to the same Broker, since Druid Brokers do not share connection state with each other.</p>
@@ -203,7 +203,7 @@ processes, so explicit routing needs to be used to indicate the proxy destinatio
 
 <span class="hljs-attr">druid.server.http.numThreads</span>=<span class="hljs-number">100</span>
 </code></pre>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/design/overlord.html"><span class="arrow-prev">← </span><span>Overlord Process</span></a><a class="docs-next button" href="/docs/latest/design/peons.html"><span>Peons</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology"> [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/design/overlord.html"><span class="arrow-prev">← </span><span>Overlord Process</span></a><a class="docs-next button" href="/docs/0.21.0/design/peons.html"><span>Peons</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology"> [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -220,6 +220,6 @@ processes, so explicit routing needs to be used to indicate the proxy destinatio
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                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/design/segments.html b/docs/0.21.0/design/segments.html
similarity index 68%
copy from docs/latest/design/segments.html
copy to docs/0.21.0/design/segments.html
index b5e44a6..fb96b01 100644
--- a/docs/latest/design/segments.html
+++ b/docs/0.21.0/design/segments.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Segments · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/design/segments.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.2" /><meta property= [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Segments · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/design/segments.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21.0" /><meta property= [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
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@@ -81,7 +81,7 @@
 time. In a basic setup, one segment file is created for each time
 interval, where the time interval is configurable in the
 <code>segmentGranularity</code> parameter of the
-<a href="/docs/latest/ingestion/index.html#granularityspec"><code>granularitySpec</code></a>.  For Druid to
+<a href="/docs/0.21.0/ingestion/index.html#granularityspec"><code>granularitySpec</code></a>.  For Druid to
 operate well under heavy query load, it is important for the segment
 file size to be within the recommended range of 300MB-700MB. If your
 segment files are larger than this range, then consider either
@@ -89,7 +89,7 @@ changing the granularity of the time interval or partitioning your
 data and tweaking the <code>targetPartitionSize</code> in your <code>partitionsSpec</code>
 (a good starting point for this parameter is 5 million rows).  See the
 sharding section below and the 'Partitioning specification' section of
-the <a href="/docs/latest/ingestion/hadoop.html#partitionsspec">Batch ingestion</a> documentation
+the <a href="/docs/0.21.0/ingestion/hadoop.html#partitionsspec">Batch ingestion</a> documentation
 for more information.</p>
 <h3><a class="anchor" aria-hidden="true" id="a-segment-files-core-data-structures"></a><a href="#a-segment-files-core-data-structures" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 [...]
 <p>Here we describe the internal structure of segment files, which is
@@ -209,7 +209,7 @@ datasource_intervalStart_intervalEnd_version_partitionNum</p>
 </ol>
 <p>A ColumnDescriptor is essentially an object that allows us to use Jackson's polymorphic deserialization to add new and interesting methods of serialization with minimal impact to the code. It consists of some metadata about the column (what type is it, is it multi-value, etc.) and then a list of serialization/deserialization logic that can deserialize the rest of the binary.</p>
 <h3><a class="anchor" aria-hidden="true" id="compression"></a><a href="#compression" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42 [...]
-<p>Druid compresses blocks of values for string, long, float, and double columns, using <a href="https://github.com/lz4/lz4-java">LZ4</a> by default, and bitmaps for string columns and numeric null values are compressed using <a href="https://github.com/RoaringBitmap/RoaringBitmap">Roaring</a>. We recommend sticking with these defaults unless experimental verification with your own data and query patterns suggest that non-default options will perform better in your specific case. For exa [...]
+<p>Druid compresses blocks of values for string, long, float, and double columns, using <a href="https://github.com/lz4/lz4-java">LZ4</a> by default, and bitmaps for string columns and numeric null values are compressed using <a href="https://github.com/RoaringBitmap/RoaringBitmap">Roaring</a>. We recommend sticking with these defaults unless experimental verification with your own data and query patterns suggest that non-default options will perform better in your specific case. For exa [...]
 <h2><a class="anchor" aria-hidden="true" id="sharding-data-to-create-segments"></a><a href="#sharding-data-to-create-segments" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13. [...]
 <h3><a class="anchor" aria-hidden="true" id="sharding"></a><a href="#sharding" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64  [...]
 <p>Multiple segments may exist for the same interval of time for the same datasource. These segments form a <code>block</code> for an interval.
@@ -259,7 +259,7 @@ foo_2015<span class="hljs-number">-01</span><span class="hljs-number">-03</span>
 another, queries that involve both segments still work. Queries for the segment missing the dimension will behave as if the dimension has only null values.
 Similarly, if one segment has a numeric column (metric) but another does not, queries on the segment missing the
 metric will generally &quot;do the right thing&quot;. Aggregations over this missing metric behave as if the metric were missing.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/design/architecture.html"><span class="arrow-prev">← </span><span>Design</span></a><a class="docs-next button" href="/docs/latest/design/processes.html"><span>Processes and servers</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#sql-compatible-null-handling">SQL Compatible Null Handling</a></li><li><a href="#nam [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/design/architecture.html"><span class="arrow-prev">← </span><span>Design</span></a><a class="docs-next button" href="/docs/0.21.0/design/processes.html"><span>Processes and servers</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#sql-compatible-null-handling">SQL Compatible Null Handling</a></li><li><a href="#nam [...]
                 document.addEventListener('keyup', function(e) {
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                     return;
@@ -276,6 +276,6 @@ metric will generally &quot;do the right thing&quot;. Aggregations over this mis
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/development/approximate-histograms.html b/docs/0.21.0/development/approximate-histograms.html
new file mode 100644
index 0000000..8df4839
--- /dev/null
+++ b/docs/0.21.0/development/approximate-histograms.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="extensions-core/approximate-histograms.html">
+<meta http-equiv="refresh" content="0; url=extensions-core/approximate-histograms.html">
+<h1>Redirecting...</h1>
+<a href="extensions-core/approximate-histograms.html">Click here if you are not redirected.</a>
+<script>location="extensions-core/approximate-histograms.html"</script>
diff --git a/docs/latest/development/build.html b/docs/0.21.0/development/build.html
similarity index 51%
copy from docs/latest/development/build.html
copy to docs/0.21.0/development/build.html
index 251fc6e..498af97 100644
--- a/docs/latest/development/build.html
+++ b/docs/0.21.0/development/build.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Build from source · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/build.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.2" /><met [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Build from source · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/build.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21.0" /><met [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
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@@ -110,7 +110,7 @@ like <a href="https://aws.amazon.com/corretto/">Amazon Corretto</a> or <a href="
 <p>Putting these together, if you wish to build the source and binary distributions with signatures and checksums, audit licenses, and skip the unit tests, you would run:</p>
 <pre><code class="hljs css language-bash">mvn clean install -Papache-release,dist,rat -DskipTests
 </code></pre>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/javascript.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">JavaScript functionality</span></a><a class="docs-next button" href="/docs/latest/development/versioning.html"><span>Versioning</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class=" [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/javascript.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">JavaScript functionality</span></a><a class="docs-next button" href="/docs/0.21.0/development/versioning.html"><span>Versioning</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class=" [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -127,6 +127,6 @@ like <a href="https://aws.amazon.com/corretto/">Amazon Corretto</a> or <a href="
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/development/community-extensions/azure.html b/docs/0.21.0/development/community-extensions/azure.html
new file mode 100644
index 0000000..8c8a06e
--- /dev/null
+++ b/docs/0.21.0/development/community-extensions/azure.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../extensions-core/azure.html">
+<meta http-equiv="refresh" content="0; url=../extensions-core/azure.html">
+<h1>Redirecting...</h1>
+<a href="../extensions-core/azure.html">Click here if you are not redirected.</a>
+<script>location="../extensions-core/azure.html"</script>
diff --git a/docs/0.21.0/development/community-extensions/cassandra.html b/docs/0.21.0/development/community-extensions/cassandra.html
new file mode 100644
index 0000000..7026a6a
--- /dev/null
+++ b/docs/0.21.0/development/community-extensions/cassandra.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../extensions-contrib/cassandra.html">
+<meta http-equiv="refresh" content="0; url=../extensions-contrib/cassandra.html">
+<h1>Redirecting...</h1>
+<a href="../extensions-contrib/cassandra.html">Click here if you are not redirected.</a>
+<script>location="../extensions-contrib/cassandra.html"</script>
diff --git a/docs/0.21.0/development/community-extensions/cloudfiles.html b/docs/0.21.0/development/community-extensions/cloudfiles.html
new file mode 100644
index 0000000..0c9b8c5
--- /dev/null
+++ b/docs/0.21.0/development/community-extensions/cloudfiles.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../extensions-contrib/cloudfiles.html">
+<meta http-equiv="refresh" content="0; url=../extensions-contrib/cloudfiles.html">
+<h1>Redirecting...</h1>
+<a href="../extensions-contrib/cloudfiles.html">Click here if you are not redirected.</a>
+<script>location="../extensions-contrib/cloudfiles.html"</script>
diff --git a/docs/0.21.0/development/community-extensions/graphite.html b/docs/0.21.0/development/community-extensions/graphite.html
new file mode 100644
index 0000000..dc31894
--- /dev/null
+++ b/docs/0.21.0/development/community-extensions/graphite.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../extensions-contrib/graphite.html">
+<meta http-equiv="refresh" content="0; url=../extensions-contrib/graphite.html">
+<h1>Redirecting...</h1>
+<a href="../extensions-contrib/graphite.html">Click here if you are not redirected.</a>
+<script>location="../extensions-contrib/graphite.html"</script>
diff --git a/docs/0.21.0/development/community-extensions/kafka-simple.html b/docs/0.21.0/development/community-extensions/kafka-simple.html
new file mode 100644
index 0000000..179d16a
--- /dev/null
+++ b/docs/0.21.0/development/community-extensions/kafka-simple.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../extensions-core/kafka-ingestion.html">
+<meta http-equiv="refresh" content="0; url=../extensions-core/kafka-ingestion.html">
+<h1>Redirecting...</h1>
+<a href="../extensions-core/kafka-ingestion.html">Click here if you are not redirected.</a>
+<script>location="../extensions-core/kafka-ingestion.html"</script>
diff --git a/docs/0.21.0/development/community-extensions/rabbitmq.html b/docs/0.21.0/development/community-extensions/rabbitmq.html
new file mode 100644
index 0000000..179d16a
--- /dev/null
+++ b/docs/0.21.0/development/community-extensions/rabbitmq.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../extensions-core/kafka-ingestion.html">
+<meta http-equiv="refresh" content="0; url=../extensions-core/kafka-ingestion.html">
+<h1>Redirecting...</h1>
+<a href="../extensions-core/kafka-ingestion.html">Click here if you are not redirected.</a>
+<script>location="../extensions-core/kafka-ingestion.html"</script>
diff --git a/docs/0.21.0/development/datasketches-aggregators.html b/docs/0.21.0/development/datasketches-aggregators.html
new file mode 100644
index 0000000..9ef81f4
--- /dev/null
+++ b/docs/0.21.0/development/datasketches-aggregators.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="extensions-core/datasketches-extension.html">
+<meta http-equiv="refresh" content="0; url=extensions-core/datasketches-extension.html">
+<h1>Redirecting...</h1>
+<a href="extensions-core/datasketches-extension.html">Click here if you are not redirected.</a>
+<script>location="extensions-core/datasketches-extension.html"</script>
diff --git a/docs/0.21.0/development/experimental.html b/docs/0.21.0/development/experimental.html
new file mode 100644
index 0000000..3ddec37
--- /dev/null
+++ b/docs/0.21.0/development/experimental.html
@@ -0,0 +1,110 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Experimental features · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/experimental.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.2 [...]
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
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+            var checkActiveCategory = true;
+            for (var i = 0; i < coll.length; i++) {
+              var links = coll[i].nextElementSibling.getElementsByTagName('*');
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+                    coll[i].childNodes[1].classList.toggle('rotate');
+                    checkActiveCategory = false;
+                    break;
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+
+              coll[i].addEventListener('click', function() {
+                var arrow = this.childNodes[1];
+                arrow.classList.toggle('rotate');
+                var content = this.nextElementSibling;
+                content.classList.toggle('hide');
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+            }
+
+            document.addEventListener('DOMContentLoaded', function() {
+              createToggler('#navToggler', '#docsNav', 'docsSliderActive');
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+                var el = event.target;
+                while(el !== headings){
+                  if (el.tagName === 'A') {
+                    document.body.classList.remove('tocActive');
+                    break;
+                  } else{
+                    el = el.parentNode;
+                  }
+                }
+              }, false);
+
+              function createToggler(togglerSelector, targetSelector, className) {
+                var toggler = document.querySelector(togglerSelector);
+                var target = document.querySelector(targetSelector);
+
+                if (!toggler) {
+                  return;
+                }
+
+                toggler.onclick = function(event) {
+                  event.preventDefault();
+
+                  target.classList.toggle(className);
+                };
+              }
+            });
+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/development/experimental.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Experimental features</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>Features often start out in &quot;experimental&quot; status that indicates they are still evolving.
+This can mean any of the following things:</p>
+<ol>
+<li>The feature's API may change even in minor releases or patch releases.</li>
+<li>The feature may have known &quot;missing&quot; pieces that will be added later.</li>
+<li>The feature may or may not have received full battle-testing in production environments.</li>
+</ol>
+<p>All experimental features are optional.</p>
+<p>Note that not all of these points apply to every experimental feature. Some have been battle-tested in terms of
+implementation, but are still marked experimental due to an evolving API. Please check the documentation for each
+feature for full details.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/versioning.html"><span class="arrow-prev">← </span><span>Versioning</span></a><a class="docs-next button" href="/docs/0.21.0/misc/papers-and-talks.html"><span>Papers</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/t [...]
+                document.addEventListener('keyup', function(e) {
+                  if (e.target !== document.body) {
+                    return;
+                  }
+                  // keyCode for '/' (slash)
+                  if (e.keyCode === 191) {
+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
+                apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
+                indexName: 'apache_druid',
+                inputSelector: '#search_input_react',
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
+              });
+            </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/development/extensions-contrib/aliyun-oss.html b/docs/0.21.0/development/extensions-contrib/aliyun-oss.html
new file mode 100644
index 0000000..60779e9
--- /dev/null
+++ b/docs/0.21.0/development/extensions-contrib/aliyun-oss.html
@@ -0,0 +1,135 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Aliyun OSS · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-contrib/aliyun-oss.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" conten [...]
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            var coll = document.getElementsByClassName('collapsible');
+            var checkActiveCategory = true;
+            for (var i = 0; i < coll.length; i++) {
+              var links = coll[i].nextElementSibling.getElementsByTagName('*');
+              if (checkActiveCategory){
+                for (var j = 0; j < links.length; j++) {
+                  if (links[j].classList.contains('navListItemActive')){
+                    coll[i].nextElementSibling.classList.toggle('hide');
+                    coll[i].childNodes[1].classList.toggle('rotate');
+                    checkActiveCategory = false;
+                    break;
+                  }
+                }
+              }
+
+              coll[i].addEventListener('click', function() {
+                var arrow = this.childNodes[1];
+                arrow.classList.toggle('rotate');
+                var content = this.nextElementSibling;
+                content.classList.toggle('hide');
+              });
+            }
+
+            document.addEventListener('DOMContentLoaded', function() {
+              createToggler('#navToggler', '#docsNav', 'docsSliderActive');
+              createToggler('#tocToggler', 'body', 'tocActive');
+
+              var headings = document.querySelector('.toc-headings');
+              headings && headings.addEventListener('click', function(event) {
+                var el = event.target;
+                while(el !== headings){
+                  if (el.tagName === 'A') {
+                    document.body.classList.remove('tocActive');
+                    break;
+                  } else{
+                    el = el.parentNode;
+                  }
+                }
+              }, false);
+
+              function createToggler(togglerSelector, targetSelector, className) {
+                var toggler = document.querySelector(togglerSelector);
+                var target = document.querySelector(targetSelector);
+
+                if (!toggler) {
+                  return;
+                }
+
+                toggler.onclick = function(event) {
+                  event.preventDefault();
+
+                  target.classList.toggle(className);
+                };
+              }
+            });
+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/development/extensions-contrib/aliyun-oss-extensions.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Aliyun OSS</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>aliyun-oss-extensions</code> extension.</p>
+<h2><a class="anchor" aria-hidden="true" id="deep-storage"></a><a href="#deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83. [...]
+<p><a href="https://www.aliyun.com">Aliyun</a> is the 3rd largest cloud infrastructure provider in the world. It provides its own storage solution known as OSS, <a href="https://www.aliyun.com/product/oss">Object Storage Service</a>.</p>
+<p>To use aliyun OSS as deep storage, first config as below</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Possible Values</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.oss.accessKey</code></td><td>the <code>AccessKey ID</code> of your account which can be used to access the bucket</td><td></td><td>Must be set.</td></tr>
+<tr><td><code>druid.oss.secretKey</code></td><td>the <code>AccessKey Secret</code> of your account which can be used to access the bucket</td><td></td><td>Must be set.</td></tr>
+<tr><td><code>druid.oss.endpoint</code></td><td>the endpoint url of your OSS storage</td><td></td><td>Must be set.</td></tr>
+</tbody>
+</table>
+<p>if you want to use OSS as deep storage, use the configurations below</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Possible Values</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.storage.type</code></td><td>Global deep storage provider. Must be set to <code>oss</code> to make use of this extension.</td><td>oss</td><td>Must be set.</td></tr>
+<tr><td><code>druid.storage.oss.bucket</code></td><td>storage bucket name.</td><td></td><td>Must be set.</td></tr>
+<tr><td><code>druid.storage.oss.prefix</code></td><td>a prefix string prepended to the file names for the segments published to aliyun OSS deep storage</td><td>druid/segments</td><td></td></tr>
+</tbody>
+</table>
+<p>To save index logs to OSS, apply the configurations below:</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Possible Values</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.indexer.logs.type</code></td><td>Global deep storage provider. Must be set to <code>oss</code> to make use of this extension.</td><td>oss</td><td>Must be set.</td></tr>
+<tr><td><code>druid.indexer.logs.oss.bucket</code></td><td>the bucket used to keep logs</td><td></td><td>Must be set.</td></tr>
+<tr><td><code>druid.indexer.logs.oss.prefix</code></td><td>a prefix string prepended to the log files.</td><td></td><td></td></tr>
+</tbody>
+</table>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-contrib/gce-extensions.html"><span class="arrow-prev">← </span><span>GCE Extensions</span></a><a class="docs-next button" href="/docs/0.21.0/querying/hll-old.html"><span class="function-name-prevnext">Cardinality/HyperUnique aggregators</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#deep- [...]
+                document.addEventListener('keyup', function(e) {
+                  if (e.target !== document.body) {
+                    return;
+                  }
+                  // keyCode for '/' (slash)
+                  if (e.keyCode === 191) {
+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
+                apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
+                indexName: 'apache_druid',
+                inputSelector: '#search_input_react',
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
+              });
+            </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-contrib/ambari-metrics-emitter.html b/docs/0.21.0/development/extensions-contrib/ambari-metrics-emitter.html
similarity index 56%
copy from docs/latest/development/extensions-contrib/ambari-metrics-emitter.html
copy to docs/0.21.0/development/extensions-contrib/ambari-metrics-emitter.html
index 5b21a1a..75ffecf 100644
--- a/docs/latest/development/extensions-contrib/ambari-metrics-emitter.html
+++ b/docs/0.21.0/development/extensions-contrib/ambari-metrics-emitter.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Ambari Metrics Emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/ambari-metrics-emitter.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="d [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Ambari Metrics Emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-contrib/ambari-metrics-emitter.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="d [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,7 +77,7 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>To use this Apache Druid extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>ambari-metrics-emitter</code> extension.</p>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>ambari-metrics-emitter</code> extension.</p>
 <h2><a class="anchor" aria-hidden="true" id="introduction"></a><a href="#introduction" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83. [...]
 <p>This extension emits Druid metrics to a ambari-metrics carbon server.
 Events are sent after been <a href="http://ambari-metrics.readthedocs.org/en/latest/feeding-carbon.html#the-pickle-protocol">pickled</a>; the size of the batch is configurable.</p>
@@ -138,7 +138,7 @@ druid.emitter.ambari-metrics.eventConverter={"type":"whiteList", "namespacePrefi
 
 </code></pre>
 <p><strong>Druid emits a huge number of metrics we highly recommend to use the <code>whiteList</code> converter</strong></p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-core/test-stats.html"><span class="arrow-prev">← </span><span>Test Stats Aggregators</span></a><a class="docs-next button" href="/docs/latest/development/extensions-contrib/cassandra.html"><span>Apache Cassandra</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#introduction">Introduction</a> [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/test-stats.html"><span class="arrow-prev">← </span><span>Test Stats Aggregators</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-contrib/cassandra.html"><span>Apache Cassandra</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#introduction">Introduction</a> [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -155,6 +155,6 @@ druid.emitter.ambari-metrics.eventConverter={"type":"whiteList", "namespacePrefi
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/development/extensions-contrib/cassandra.html b/docs/0.21.0/development/extensions-contrib/cassandra.html
new file mode 100644
index 0000000..e9bc3eb
--- /dev/null
+++ b/docs/0.21.0/development/extensions-contrib/cassandra.html
@@ -0,0 +1,103 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Apache Cassandra · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-contrib/cassandra.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" c [...]
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            var coll = document.getElementsByClassName('collapsible');
+            var checkActiveCategory = true;
+            for (var i = 0; i < coll.length; i++) {
+              var links = coll[i].nextElementSibling.getElementsByTagName('*');
+              if (checkActiveCategory){
+                for (var j = 0; j < links.length; j++) {
+                  if (links[j].classList.contains('navListItemActive')){
+                    coll[i].nextElementSibling.classList.toggle('hide');
+                    coll[i].childNodes[1].classList.toggle('rotate');
+                    checkActiveCategory = false;
+                    break;
+                  }
+                }
+              }
+
+              coll[i].addEventListener('click', function() {
+                var arrow = this.childNodes[1];
+                arrow.classList.toggle('rotate');
+                var content = this.nextElementSibling;
+                content.classList.toggle('hide');
+              });
+            }
+
+            document.addEventListener('DOMContentLoaded', function() {
+              createToggler('#navToggler', '#docsNav', 'docsSliderActive');
+              createToggler('#tocToggler', 'body', 'tocActive');
+
+              var headings = document.querySelector('.toc-headings');
+              headings && headings.addEventListener('click', function(event) {
+                var el = event.target;
+                while(el !== headings){
+                  if (el.tagName === 'A') {
+                    document.body.classList.remove('tocActive');
+                    break;
+                  } else{
+                    el = el.parentNode;
+                  }
+                }
+              }, false);
+
+              function createToggler(togglerSelector, targetSelector, className) {
+                var toggler = document.querySelector(togglerSelector);
+                var target = document.querySelector(targetSelector);
+
+                if (!toggler) {
+                  return;
+                }
+
+                toggler.onclick = function(event) {
+                  event.preventDefault();
+
+                  target.classList.toggle(className);
+                };
+              }
+            });
+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/development/extensions-contrib/cassandra.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Apache Cassandra</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-cassandra-storage</code> extension.</p>
+<p><a href="http://www.datastax.com/what-we-offer/products-services/datastax-enterprise/apache-cassandra">Apache Cassandra</a> can also
+be leveraged for deep storage.  This requires some additional Druid configuration as well as setting up the necessary
+schema within a Cassandra keystore.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-contrib/ambari-metrics-emitter.html"><span class="arrow-prev">← </span><span>Ambari Metrics Emitter</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-contrib/cloudfiles.html"><span>Rackspace Cloud Files</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-foot [...]
+                document.addEventListener('keyup', function(e) {
+                  if (e.target !== document.body) {
+                    return;
+                  }
+                  // keyCode for '/' (slash)
+                  if (e.keyCode === 191) {
+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
+                apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
+                indexName: 'apache_druid',
+                inputSelector: '#search_input_react',
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
+              });
+            </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-contrib/cloudfiles.html b/docs/0.21.0/development/extensions-contrib/cloudfiles.html
similarity index 53%
copy from docs/latest/development/extensions-contrib/cloudfiles.html
copy to docs/0.21.0/development/extensions-contrib/cloudfiles.html
index 6aec398..136e134 100644
--- a/docs/latest/development/extensions-contrib/cloudfiles.html
+++ b/docs/0.21.0/development/extensions-contrib/cloudfiles.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Rackspace Cloud Files · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/cloudfiles.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:vers [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Rackspace Cloud Files · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-contrib/cloudfiles.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:vers [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,7 +77,7 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>To use this Apache Druid extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>druid-cloudfiles-extensions</code> extension.</p>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-cloudfiles-extensions</code> extension.</p>
 <h2><a class="anchor" aria-hidden="true" id="deep-storage"></a><a href="#deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83. [...]
 <p><a href="http://www.rackspace.com/cloud/files/">Rackspace Cloud Files</a> is another option for deep storage. This requires some additional Druid configuration.</p>
 <table>
@@ -103,7 +103,7 @@
 <p>Data is newline delimited, with one JSON object per line and parsed as per the <code>InputRowParser</code> configuration.</p>
 <p>The storage account is shared with the one used for Rackspace's Cloud Files deep storage functionality, but blobs can be in a different region and container.</p>
 <p>As with the Azure blobstore, it is assumed to be gzipped if the extension ends in .gz</p>
-<p>This firehose is <em>splittable</em> and can be used by <a href="/docs/latest/ingestion/native-batch.html#parallel-task">native parallel index tasks</a>.
+<p>This firehose is <em>splittable</em> and can be used by <a href="/docs/0.21.0/ingestion/native-batch.html#parallel-task">native parallel index tasks</a>.
 Since each split represents an object in this firehose, each worker task of <code>index_parallel</code> will read an object.</p>
 <p>Sample spec:</p>
 <pre><code class="hljs css language-json">"firehose" : {
@@ -148,7 +148,7 @@ shardSpecs are not specified, and, in this case, caching can be useful. Prefetch
 <tr><td>path</td><td>The path where data is located.</td><td>N/A</td><td>yes</td></tr>
 </tbody>
 </table>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-contrib/cassandra.html"><span class="arrow-prev">← </span><span>Apache Cassandra</span></a><a class="docs-next button" href="/docs/latest/development/extensions-contrib/distinctcount.html"><span class="function-name-prevnext">DistinctCount Aggregator</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li>< [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-contrib/cassandra.html"><span class="arrow-prev">← </span><span>Apache Cassandra</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-contrib/distinctcount.html"><span class="function-name-prevnext">DistinctCount Aggregator</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li>< [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -165,6 +165,6 @@ shardSpecs are not specified, and, in this case, caching can be useful. Prefetch
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-contrib/distinctcount.html b/docs/0.21.0/development/extensions-contrib/distinctcount.html
similarity index 53%
copy from docs/latest/development/extensions-contrib/distinctcount.html
copy to docs/0.21.0/development/extensions-contrib/distinctcount.html
index b3092ce..6b6c159 100644
--- a/docs/latest/development/extensions-contrib/distinctcount.html
+++ b/docs/0.21.0/development/extensions-contrib/distinctcount.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>DistinctCount Aggregator · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/distinctcount.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearc [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>DistinctCount Aggregator · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-contrib/distinctcount.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearc [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,7 +77,7 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>To use this Apache Druid extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> the <code>druid-distinctcount</code> extension.</p>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> the <code>druid-distinctcount</code> extension.</p>
 <p>Additionally, follow these steps:</p>
 <ol>
 <li>First, use a single dimension hash-based partition spec to partition data by a single dimension. For example visitor_id. This to make sure all rows with a particular value for that dimension will go into the same segment, or this might over count.</li>
@@ -140,7 +140,7 @@
   ]
 }
 </code></pre>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-contrib/cloudfiles.html"><span class="arrow-prev">← </span><span>Rackspace Cloud Files</span></a><a class="docs-next button" href="/docs/latest/development/extensions-contrib/graphite.html"><span>Graphite Emitter</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#timeseries-query">Timeseries  [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-contrib/cloudfiles.html"><span class="arrow-prev">← </span><span>Rackspace Cloud Files</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-contrib/graphite.html"><span>Graphite Emitter</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#timeseries-query">Timeseries  [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -157,6 +157,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-contrib/gce-extensions.html b/docs/0.21.0/development/extensions-contrib/gce-extensions.html
similarity index 53%
copy from docs/latest/development/extensions-contrib/gce-extensions.html
copy to docs/0.21.0/development/extensions-contrib/gce-extensions.html
index 10fc404..ea69d1d 100644
--- a/docs/latest/development/extensions-contrib/gce-extensions.html
+++ b/docs/0.21.0/development/extensions-contrib/gce-extensions.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>GCE Extensions · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/gce-extensions.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>GCE Extensions · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-contrib/gce-extensions.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,7 +77,7 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>To use this Apache Druid (incubating) extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>gce-extensions</code>.</p>
+<p>To use this Apache Druid (incubating) extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>gce-extensions</code>.</p>
 <p>At the moment, this extension enables only Druid to autoscale instances in GCE.</p>
 <p>The extension manages the instances to be scaled up and down through the use of the <a href="https://cloud.google.com/compute/docs/instance-groups/creating-groups-of-managed-instances#resize_managed_group">Managed Instance Groups</a>
 of GCE (MIG from now on). This choice has been made to ease the configuration of the machines and simplify their
@@ -136,7 +136,7 @@ request to provision more workers.  This is safe to be left to <code>1</code></l
 <li>The <code>managedInstanceGroupName</code> used to specify the MIG containing the instances created or
 removed</li>
 </ul>
-<p>Please refer to the Overlord Dynamic Configuration section in the main <a href="/docs/latest/configuration/index.html">documentation</a>
+<p>Please refer to the Overlord Dynamic Configuration section in the main <a href="/docs/0.21.0/configuration/index.html">documentation</a>
 for parameters other than the ones specified here, such as <code>selectStrategy</code> etc.</p>
 <h2><a class="anchor" aria-hidden="true" id="known-limitations"></a><a href="#known-limitations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2- [...]
 <ul>
@@ -146,7 +146,7 @@ call from the API and, while the documentation of the API states that the call c
 that the extension can operate safely with a maximum of 500 MiddleManagers instances at any time (the maximum number
 of instances to be returned for each call).</li>
 </ul>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-contrib/time-min-max.html"><span class="arrow-prev">← </span><span>Timestamp Min/Max aggregators</span></a><a class="docs-next button" href="/docs/latest/development/extensions-contrib/aliyun-oss.html"><span>Aliyun OSS</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#overlord-dynamic-config [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-contrib/time-min-max.html"><span class="arrow-prev">← </span><span>Timestamp Min/Max aggregators</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-contrib/aliyun-oss.html"><span>Aliyun OSS</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#overlord-dynamic-config [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -163,6 +163,6 @@ of instances to be returned for each call).</li>
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/development/extensions-contrib/google.html b/docs/0.21.0/development/extensions-contrib/google.html
new file mode 100644
index 0000000..cca1c23
--- /dev/null
+++ b/docs/0.21.0/development/extensions-contrib/google.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../extensions-core/google.html">
+<meta http-equiv="refresh" content="0; url=../extensions-core/google.html">
+<h1>Redirecting...</h1>
+<a href="../extensions-core/google.html">Click here if you are not redirected.</a>
+<script>location="../extensions-core/google.html"</script>
diff --git a/docs/latest/development/extensions-contrib/graphite.html b/docs/0.21.0/development/extensions-contrib/graphite.html
similarity index 58%
copy from docs/latest/development/extensions-contrib/graphite.html
copy to docs/0.21.0/development/extensions-contrib/graphite.html
index a53f2d2..e6ca296 100644
--- a/docs/latest/development/extensions-contrib/graphite.html
+++ b/docs/0.21.0/development/extensions-contrib/graphite.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Graphite Emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/graphite.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" co [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Graphite Emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-contrib/graphite.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" co [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,7 +77,7 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>To use this Apache Druid extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>graphite-emitter</code> extension.</p>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>graphite-emitter</code> extension.</p>
 <h2><a class="anchor" aria-hidden="true" id="introduction"></a><a href="#introduction" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83. [...]
 <p>This extension emits druid metrics to a graphite carbon server.
 Metrics can be sent by using <a href="http://graphite.readthedocs.io/en/latest/feeding-carbon.html#the-plaintext-protocol">plaintext</a> or <a href="http://graphite.readthedocs.io/en/latest/feeding-carbon.html#the-pickle-protocol">pickle</a> protocol.
@@ -103,7 +103,7 @@ The pickle protocol is more efficient and supports sending batches of metrics (p
 </tbody>
 </table>
 <h3><a class="anchor" aria-hidden="true" id="supported-event-types"></a><a href="#supported-event-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2 [...]
-<p>The graphite emitter only emits service metric events to graphite (See <a href="/docs/latest/operations/metrics.html">Druid Metrics</a> for a list of metrics).</p>
+<p>The graphite emitter only emits service metric events to graphite (See <a href="/docs/0.21.0/operations/metrics.html">Druid Metrics</a> for a list of metrics).</p>
 <p>Alerts and request logs are not sent to graphite. These event types are not well represented in Graphite, which is more suited for timeseries views on numeric metrics, vs. storing non-numeric log events.</p>
 <p>Instead, alerts and request logs are optionally forwarded to other emitter implementations, specified by <code>druid.emitter.graphite.alertEmitters</code> and <code>druid.emitter.graphite.requestLogEmitters</code> respectively.</p>
 <h3><a class="anchor" aria-hidden="true" id="druid-to-graphite-event-converter"></a><a href="#druid-to-graphite-event-converter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S1 [...]
@@ -148,7 +148,7 @@ druid.emitter.graphite.eventConverter={"type":"whiteList", "namespacePrefix": "d
 
 </code></pre>
 <p><strong>Druid emits a huge number of metrics we highly recommend to use the <code>whiteList</code> converter</strong></p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-contrib/distinctcount.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">DistinctCount Aggregator</span></a><a class="docs-next button" href="/docs/latest/development/extensions-contrib/influx.html"><span class="function-name-prevnext">InfluxDB Line Protocol Parser</span><span class="arrow-next"> →</span></a></div></div></div><nav class=" [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-contrib/distinctcount.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">DistinctCount Aggregator</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-contrib/influx.html"><span class="function-name-prevnext">InfluxDB Line Protocol Parser</span><span class="arrow-next"> →</span></a></div></div></div><nav class=" [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -165,6 +165,6 @@ druid.emitter.graphite.eventConverter={"type":"whiteList", "namespacePrefix": "d
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/development/extensions-contrib/influx.html b/docs/0.21.0/development/extensions-contrib/influx.html
new file mode 100644
index 0000000..fd2c949
--- /dev/null
+++ b/docs/0.21.0/development/extensions-contrib/influx.html
@@ -0,0 +1,132 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>InfluxDB Line Protocol Parser · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-contrib/influx.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch: [...]
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            var coll = document.getElementsByClassName('collapsible');
+            var checkActiveCategory = true;
+            for (var i = 0; i < coll.length; i++) {
+              var links = coll[i].nextElementSibling.getElementsByTagName('*');
+              if (checkActiveCategory){
+                for (var j = 0; j < links.length; j++) {
+                  if (links[j].classList.contains('navListItemActive')){
+                    coll[i].nextElementSibling.classList.toggle('hide');
+                    coll[i].childNodes[1].classList.toggle('rotate');
+                    checkActiveCategory = false;
+                    break;
+                  }
+                }
+              }
+
+              coll[i].addEventListener('click', function() {
+                var arrow = this.childNodes[1];
+                arrow.classList.toggle('rotate');
+                var content = this.nextElementSibling;
+                content.classList.toggle('hide');
+              });
+            }
+
+            document.addEventListener('DOMContentLoaded', function() {
+              createToggler('#navToggler', '#docsNav', 'docsSliderActive');
+              createToggler('#tocToggler', 'body', 'tocActive');
+
+              var headings = document.querySelector('.toc-headings');
+              headings && headings.addEventListener('click', function(event) {
+                var el = event.target;
+                while(el !== headings){
+                  if (el.tagName === 'A') {
+                    document.body.classList.remove('tocActive');
+                    break;
+                  } else{
+                    el = el.parentNode;
+                  }
+                }
+              }, false);
+
+              function createToggler(togglerSelector, targetSelector, className) {
+                var toggler = document.querySelector(togglerSelector);
+                var target = document.querySelector(targetSelector);
+
+                if (!toggler) {
+                  return;
+                }
+
+                toggler.onclick = function(event) {
+                  event.preventDefault();
+
+                  target.classList.toggle(className);
+                };
+              }
+            });
+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/development/extensions-contrib/influx.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">InfluxDB Line Protocol Parser</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-influx-extensions</code>.</p>
+<p>This extension enables Druid to parse the <a href="https://docs.influxdata.com/influxdb/v1.5/write_protocols/line_protocol_tutorial/">InfluxDB Line Protocol</a>, a popular text-based timeseries metric serialization format.</p>
+<h2><a class="anchor" aria-hidden="true" id="line-protocol"></a><a href="#line-protocol" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
+<p>A typical line looks like this:</p>
+<p><code>cpu,application=dbhost=prdb123,region=us-east-1 usage_idle=99.24,usage_user=0.55 1520722030000000000</code></p>
+<p>which contains four parts:</p>
+<ul>
+<li>measurement: A string indicating the name of the measurement represented (e.g. cpu, network, web_requests)</li>
+<li>tags: zero or more key-value pairs (i.e. dimensions)</li>
+<li>measurements: one or more key-value pairs; values can be numeric, boolean, or string</li>
+<li>timestamp: nanoseconds since Unix epoch (the parser truncates it to milliseconds)</li>
+</ul>
+<p>The parser extracts these fields into a map, giving the measurement the key <code>measurement</code> and the timestamp the key <code>_ts</code>. The tag and measurement keys are copied verbatim, so users should take care to avoid name collisions. It is up to the ingestion spec to decide which fields should be treated as dimensions and which should be treated as metrics (typically tags correspond to dimensions and measurements correspond to metrics).</p>
+<p>The parser is configured like so:</p>
+<pre><code class="hljs css language-json">"parser": {
+      "type": "string",
+      "parseSpec": {
+        "format": "influx",
+        "timestampSpec": {
+          "column": "__ts",
+          "format": "millis"
+        },
+        "dimensionsSpec": {
+          "dimensionExclusions": [
+            "__ts"
+          ]
+        },
+        "whitelistMeasurements": [
+          "cpu"
+        ]
+      }
+</code></pre>
+<p>The <code>whitelistMeasurements</code> field is an optional list of strings. If present, measurements that do not match one of the strings in the list will be ignored.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-contrib/graphite.html"><span class="arrow-prev">← </span><span>Graphite Emitter</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-contrib/influxdb-emitter.html"><span class="function-name-prevnext">InfluxDB Emitter</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href [...]
+                document.addEventListener('keyup', function(e) {
+                  if (e.target !== document.body) {
+                    return;
+                  }
+                  // keyCode for '/' (slash)
+                  if (e.keyCode === 191) {
+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
+                apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
+                indexName: 'apache_druid',
+                inputSelector: '#search_input_react',
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
+              });
+            </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-contrib/influxdb-emitter.html b/docs/0.21.0/development/extensions-contrib/influxdb-emitter.html
similarity index 53%
copy from docs/latest/development/extensions-contrib/influxdb-emitter.html
copy to docs/0.21.0/development/extensions-contrib/influxdb-emitter.html
index e05d221..7d28542 100644
--- a/docs/latest/development/extensions-contrib/influxdb-emitter.html
+++ b/docs/0.21.0/development/extensions-contrib/influxdb-emitter.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>InfluxDB Emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/influxdb-emitter.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:ver [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>InfluxDB Emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-contrib/influxdb-emitter.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:ver [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,9 +77,9 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>To use this Apache Druid extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>druid-influxdb-emitter</code> extension.</p>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-influxdb-emitter</code> extension.</p>
 <h2><a class="anchor" aria-hidden="true" id="introduction"></a><a href="#introduction" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83. [...]
-<p>This extension emits druid metrics to <a href="https://www.influxdata.com/time-series-platform/influxdb/">InfluxDB</a> over HTTP. Currently this emitter only emits service metric events to InfluxDB (See <a href="/docs/latest/operations/metrics.html">Druid metrics</a> for a list of metrics).
+<p>This extension emits druid metrics to <a href="https://www.influxdata.com/time-series-platform/influxdb/">InfluxDB</a> over HTTP. Currently this emitter only emits service metric events to InfluxDB (See <a href="/docs/0.21.0/operations/metrics.html">Druid metrics</a> for a list of metrics).
 When a metric event is fired it is added to a queue of events. After a configurable amount of time, the events on the queue are transformed to InfluxDB's line protocol
 and POSTed to the InfluxDB HTTP API. The entire queue is flushed at this point. The queue is also flushed as the emitter is shutdown.</p>
 <p>Note that authentication and authorization must be <a href="https://docs.influxdata.com/influxdb/v1.7/administration/authentication_and_authorization/">enabled</a> on the InfluxDB server.</p>
@@ -92,6 +92,10 @@ and POSTed to the InfluxDB HTTP API. The entire queue is flushed at this point.
 <tbody>
 <tr><td><code>druid.emitter.influxdb.hostname</code></td><td>The hostname of the InfluxDB server.</td><td>Yes</td><td>N/A</td></tr>
 <tr><td><code>druid.emitter.influxdb.port</code></td><td>The port of the InfluxDB server.</td><td>No</td><td>8086</td></tr>
+<tr><td><code>druid.emitter.influxdb.protocol</code></td><td>The protocol used to send metrics to InfluxDB. One of http/https</td><td>No</td><td>http</td></tr>
+<tr><td><code>druid.emitter.influxdb.trustStorePath</code></td><td>The path to the trustStore to be used for https</td><td>No</td><td>none</td></tr>
+<tr><td><code>druid.emitter.influxdb.trustStoreType</code></td><td>The trustStore type to be used for https</td><td>No</td><td><code>jks</code></td></tr>
+<tr><td><code>druid.emitter.influxdb.trustStorePassword</code></td><td>The trustStore password to be used for https</td><td>No</td><td>none</td></tr>
 <tr><td><code>druid.emitter.influxdb.databaseName</code></td><td>The name of the database in InfluxDB.</td><td>Yes</td><td>N/A</td></tr>
 <tr><td><code>druid.emitter.influxdb.maxQueueSize</code></td><td>The size of the queue that holds events.</td><td>No</td><td>Integer.MAX_VALUE(=2^31-1)</td></tr>
 <tr><td><code>druid.emitter.influxdb.flushPeriod</code></td><td>How often (in milliseconds) the events queue is parsed into Line Protocol and POSTed to InfluxDB.</td><td>No</td><td>60000</td></tr>
@@ -117,7 +121,7 @@ and POSTed to the InfluxDB HTTP API. The entire queue is flushed at this point.
 <p>The InfluxDB emitter has a white list of dimensions
 which will be added as a tag to the line protocol string if the metric has a dimension from the white list.
 The value of the dimension is sanitized such that every occurrence of a dot or whitespace is replaced with a <code>_</code> .</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-contrib/influx.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">InfluxDB Line Protocol Parser</span></a><a class="docs-next button" href="/docs/latest/development/extensions-contrib/kafka-emitter.html"><span>Kafka Emitter</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-contrib/influx.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">InfluxDB Line Protocol Parser</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-contrib/kafka-emitter.html"><span>Kafka Emitter</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -134,6 +138,6 @@ The value of the dimension is sanitized such that every occurrence of a dot or w
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-contrib/kafka-emitter.html b/docs/0.21.0/development/extensions-contrib/kafka-emitter.html
similarity index 51%
copy from docs/latest/development/extensions-contrib/kafka-emitter.html
copy to docs/0.21.0/development/extensions-contrib/kafka-emitter.html
index 8597d18..eae00b9 100644
--- a/docs/latest/development/extensions-contrib/kafka-emitter.html
+++ b/docs/0.21.0/development/extensions-contrib/kafka-emitter.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Kafka Emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/kafka-emitter.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version"  [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Kafka Emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-contrib/kafka-emitter.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version"  [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,7 +77,7 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>To use this Apache Druid extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>kafka-emitter</code> extension.</p>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>kafka-emitter</code> extension.</p>
 <h2><a class="anchor" aria-hidden="true" id="introduction"></a><a href="#introduction" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83. [...]
 <p>This extension emits Druid metrics to <a href="https://kafka.apache.org">Apache Kafka</a> directly with JSON format.<br>
 Currently, Kafka has not only their nice ecosystem but also consumer API readily available.
@@ -103,7 +103,7 @@ druid<span class="hljs-selector-class">.emitter</span><span class="hljs-selector
 druid<span class="hljs-selector-class">.emitter</span><span class="hljs-selector-class">.kafka</span><span class="hljs-selector-class">.alert</span>.topic=druid-alert
 druid<span class="hljs-selector-class">.emitter</span><span class="hljs-selector-class">.kafka</span><span class="hljs-selector-class">.producer</span>.config={<span class="hljs-string">"max.block.ms"</span>:<span class="hljs-number">10000</span>}
 </code></pre>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-contrib/influxdb-emitter.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">InfluxDB Emitter</span></a><a class="docs-next button" href="/docs/latest/development/extensions-contrib/materialized-view.html"><span>Materialized View</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings">< [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-contrib/influxdb-emitter.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">InfluxDB Emitter</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-contrib/materialized-view.html"><span>Materialized View</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings">< [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -120,6 +120,6 @@ druid<span class="hljs-selector-class">.emitter</span><span class="hljs-selector
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/development/extensions-contrib/kafka-simple.html b/docs/0.21.0/development/extensions-contrib/kafka-simple.html
new file mode 100644
index 0000000..4d4bfd2
--- /dev/null
+++ b/docs/0.21.0/development/extensions-contrib/kafka-simple.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../../ingestion/standalone-realtime.html">
+<meta http-equiv="refresh" content="0; url=../../ingestion/standalone-realtime.html">
+<h1>Redirecting...</h1>
+<a href="../../ingestion/standalone-realtime.html">Click here if you are not redirected.</a>
+<script>location="../../ingestion/standalone-realtime.html"</script>
diff --git a/docs/latest/development/extensions-contrib/materialized-view.html b/docs/0.21.0/development/extensions-contrib/materialized-view.html
similarity index 56%
copy from docs/latest/development/extensions-contrib/materialized-view.html
copy to docs/0.21.0/development/extensions-contrib/materialized-view.html
index 09d734a..20d175d 100644
--- a/docs/latest/development/extensions-contrib/materialized-view.html
+++ b/docs/0.21.0/development/extensions-contrib/materialized-view.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Materialized View · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/materialized-view.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:v [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Materialized View · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-contrib/materialized-view.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:v [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -122,8 +122,8 @@ The <code>derivativeDataSource</code> supervisor is used to keep the timeline of
 <tr><td>Type</td><td>The supervisor type. This should always be <code>derivativeDataSource</code>.</td><td>yes</td></tr>
 <tr><td>baseDataSource</td><td>The name of base dataSource. This dataSource data should be already stored inside Druid, and the dataSource will be used as input data.</td><td>yes</td></tr>
 <tr><td>dimensionsSpec</td><td>Specifies the dimensions of the data. These dimensions must be the subset of baseDataSource's dimensions.</td><td>yes</td></tr>
-<tr><td>metricsSpec</td><td>A list of aggregators. These metrics must be the subset of baseDataSource's metrics. See <a href="/docs/latest/querying/aggregations.html">aggregations</a>.</td><td>yes</td></tr>
-<tr><td>tuningConfig</td><td>TuningConfig must be HadoopTuningConfig. See <a href="../../ingestion/hadoop.html#tuningconfig">Hadoop tuning config</a>.</td><td>yes</td></tr>
+<tr><td>metricsSpec</td><td>A list of aggregators. These metrics must be the subset of baseDataSource's metrics. See <a href="/docs/0.21.0/querying/aggregations.html">aggregations</a>.</td><td>yes</td></tr>
+<tr><td>tuningConfig</td><td>TuningConfig must be HadoopTuningConfig. See <a href="/docs/0.21.0/ingestion/hadoop.html#tuningconfig">Hadoop tuning config</a>.</td><td>yes</td></tr>
 <tr><td>dataSource</td><td>The name of this derived dataSource.</td><td>no(default=baseDataSource-hashCode of supervisor)</td></tr>
 <tr><td>hadoopDependencyCoordinates</td><td>A JSON array of Hadoop dependency coordinates that Druid will use, this property will override the default Hadoop coordinates. Once specified, Druid will look for those Hadoop dependencies from the location specified by druid.extensions.hadoopDependenciesDir</td><td>no</td></tr>
 <tr><td>classpathPrefix</td><td>Classpath that will be prepended for the Peon process.</td><td>no</td></tr>
@@ -182,11 +182,11 @@ The <code>derivativeDataSource</code> supervisor is used to keep the timeline of
 </thead>
 <tbody>
 <tr><td>queryType</td><td>The query type. This should always be view</td><td>yes</td></tr>
-<tr><td>query</td><td>The real query of this <code>view</code> query. The real query must be <a href="/docs/latest/querying/groupbyquery.html">groupBy</a>, <a href="/docs/latest/querying/topnquery.html">topN</a>, or <a href="/docs/latest/querying/timeseriesquery.html">timeseries</a> type.</td><td>yes</td></tr>
+<tr><td>query</td><td>The real query of this <code>view</code> query. The real query must be <a href="/docs/0.21.0/querying/groupbyquery.html">groupBy</a>, <a href="/docs/0.21.0/querying/topnquery.html">topN</a>, or <a href="/docs/0.21.0/querying/timeseriesquery.html">timeseries</a> type.</td><td>yes</td></tr>
 </tbody>
 </table>
 <p><strong>Note that Materialized View is currently designated as experimental. Please make sure the time of all processes are the same and increase monotonically. Otherwise, some unexpected errors may happen on query results.</strong></p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-contrib/kafka-emitter.html"><span class="arrow-prev">← </span><span>Kafka Emitter</span></a><a class="docs-next button" href="/docs/latest/development/extensions-contrib/momentsketch-quantiles.html"><span>Moment Sketches for Approximate Quantiles module</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><l [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-contrib/kafka-emitter.html"><span class="arrow-prev">← </span><span>Kafka Emitter</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-contrib/momentsketch-quantiles.html"><span>Moment Sketches for Approximate Quantiles module</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><l [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -203,6 +203,6 @@ The <code>derivativeDataSource</code> supervisor is used to keep the timeline of
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-contrib/momentsketch-quantiles.html b/docs/0.21.0/development/extensions-contrib/momentsketch-quantiles.html
similarity index 55%
copy from docs/latest/development/extensions-contrib/momentsketch-quantiles.html
copy to docs/0.21.0/development/extensions-contrib/momentsketch-quantiles.html
index 0f972e3..ebcdfe8 100644
--- a/docs/latest/development/extensions-contrib/momentsketch-quantiles.html
+++ b/docs/0.21.0/development/extensions-contrib/momentsketch-quantiles.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Moment Sketches for Approximate Quantiles module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/momentsketch-quantiles.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" c [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Moment Sketches for Approximate Quantiles module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-contrib/momentsketch-quantiles.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" c [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -79,7 +79,7 @@
   -->
 <p>This module provides aggregators for approximate quantile queries using the <a href="https://github.com/stanford-futuredata/momentsketch">momentsketch</a> library.
 The momentsketch provides coarse quantile estimates with less space and aggregation time overheads than traditional sketches, approaching the performance of counts and sums by reconstructing distributions from computed statistics.</p>
-<p>To use this Apache Druid extension, make sure you <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> the extension in your config file:</p>
+<p>To use this Apache Druid extension, make sure you <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> the extension in your config file:</p>
 <pre><code class="hljs"><span class="hljs-attr">druid.extensions.loadList</span>=[<span class="hljs-string">"druid-momentsketch"</span>]
 </code></pre>
 <h3><a class="anchor" aria-hidden="true" id="aggregator"></a><a href="#aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1 [...]
@@ -160,7 +160,7 @@ The momentsketch provides coarse quantile estimates with less space and aggregat
   }]
 }
 </code></pre>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-contrib/materialized-view.html"><span class="arrow-prev">← </span><span>Materialized View</span></a><a class="docs-next button" href="/docs/latest/development/extensions-contrib/moving-average-query.html"><span>Moving Average Query</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-foote [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-contrib/materialized-view.html"><span class="arrow-prev">← </span><span>Materialized View</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-contrib/moving-average-query.html"><span>Moving Average Query</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-foote [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -177,6 +177,6 @@ The momentsketch provides coarse quantile estimates with less space and aggregat
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-contrib/moving-average-query.html b/docs/0.21.0/development/extensions-contrib/moving-average-query.html
similarity index 67%
copy from docs/latest/development/extensions-contrib/moving-average-query.html
copy to docs/0.21.0/development/extensions-contrib/moving-average-query.html
index 7479ab5..202761f 100644
--- a/docs/latest/development/extensions-contrib/moving-average-query.html
+++ b/docs/0.21.0/development/extensions-contrib/moving-average-query.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Moving Average Query · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/moving-average-query.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docse [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Moving Average Query · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-contrib/moving-average-query.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docse [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -81,10 +81,10 @@
 <p><strong>Moving Average Query</strong> is an extension which provides support for <a href="https://en.wikipedia.org/wiki/Moving_average">Moving Average</a> and other Aggregate <a href="https://en.wikibooks.org/wiki/Structured_Query_Language/Window_functions">Window Functions</a> in Druid queries.</p>
 <p>These Aggregate Window Functions consume standard Druid Aggregators and outputs additional windowed aggregates called <a href="#averagers">Averagers</a>.</p>
 <h4><a class="anchor" aria-hidden="true" id="high-level-algorithm"></a><a href="#high-level-algorithm" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1 [...]
-<p>Moving Average encapsulates the <a href="/docs/latest/querying/groupbyquery.html">groupBy query</a> (Or <a href="/docs/latest/querying/timeseriesquery.html">timeseries</a> in case of no dimensions) in order to rely on the maturity of these query types.</p>
+<p>Moving Average encapsulates the <a href="/docs/0.21.0/querying/groupbyquery.html">groupBy query</a> (Or <a href="/docs/0.21.0/querying/timeseriesquery.html">timeseries</a> in case of no dimensions) in order to rely on the maturity of these query types.</p>
 <p>It runs the query in two main phases:</p>
 <ol>
-<li>Runs an inner <a href="../../querying/groupbyquery.html">groupBy</a> or <a href="../../querying/timeseriesquery.html">timeseries</a> query to compute Aggregators (i.e. daily count of events).</li>
+<li>Runs an inner <a href="/docs/0.21.0/querying/groupbyquery.html">groupBy</a> or <a href="/docs/0.21.0/querying/timeseriesquery.html">timeseries</a> query to compute Aggregators (i.e. daily count of events).</li>
 <li>Passes over aggregated results in Broker, in order to compute Averagers (i.e. moving 7 day average of the daily count).</li>
 </ol>
 <h4><a class="anchor" aria-hidden="true" id="main-enhancements-provided-by-this-extension"></a><a href="#main-enhancements-provided-by-this-extension" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v [...]
@@ -97,7 +97,7 @@
 <p><a href="https://en.wikibooks.org/wiki/Structured_Query_Language/Window_functions">Window Functions</a></p>
 <p><a href="https://cloud.google.com/bigquery/docs/reference/standard-sql/analytic-function-concepts">Analytic Functions</a></p>
 <h2><a class="anchor" aria-hidden="true" id="operations"></a><a href="#operations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1 [...]
-<p>To use this extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">load</a> <code>druid-moving-average-query</code> only to the Broker.</p>
+<p>To use this extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">load</a> <code>druid-moving-average-query</code> only to the Broker.</p>
 <h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
 <p>There are currently no configuration properties specific to Moving Average.</p>
 <h2><a class="anchor" aria-hidden="true" id="limitations"></a><a href="#limitations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42 [...]
@@ -108,7 +108,7 @@
 </ul>
 <p>##Query spec:</p>
 <ul>
-<li>Most properties in the query spec derived from  <a href="/docs/latest/querying/groupbyquery.html">groupBy query</a> / <a href="/docs/latest/querying/timeseriesquery.html">timeseries</a>, see documentation for these query types.</li>
+<li>Most properties in the query spec derived from  <a href="/docs/0.21.0/querying/groupbyquery.html">groupBy query</a> / <a href="/docs/0.21.0/querying/timeseriesquery.html">timeseries</a>, see documentation for these query types.</li>
 </ul>
 <table>
 <thead>
@@ -116,18 +116,18 @@
 </thead>
 <tbody>
 <tr><td>queryType</td><td>This String should always be &quot;movingAverage&quot;; this is the first thing Druid looks at to figure out how to interpret the query.</td><td>yes</td></tr>
-<tr><td>dataSource</td><td>A String or Object defining the data source to query, very similar to a table in a relational database. See <a href="/docs/latest/querying/datasource.html">DataSource</a> for more information.</td><td>yes</td></tr>
-<tr><td>dimensions</td><td>A JSON list of <a href="/docs/latest/querying/dimensionspecs.html">DimensionSpec</a> (Notice that property is optional)</td><td>no</td></tr>
-<tr><td>limitSpec</td><td>See <a href="/docs/latest/querying/limitspec.html">LimitSpec</a></td><td>no</td></tr>
-<tr><td>having</td><td>See <a href="/docs/latest/querying/having.html">Having</a></td><td>no</td></tr>
-<tr><td>granularity</td><td>A period granularity; See <a href="../../querying/granularities.html#period-granularities">Period Granularities</a></td><td>yes</td></tr>
-<tr><td>filter</td><td>See <a href="/docs/latest/querying/filters.html">Filters</a></td><td>no</td></tr>
-<tr><td>aggregations</td><td>Aggregations forms the input to Averagers; See <a href="/docs/latest/querying/aggregations.html">Aggregations</a></td><td>yes</td></tr>
-<tr><td>postAggregations</td><td>Supports only aggregations as input; See <a href="/docs/latest/querying/post-aggregations.html">Post Aggregations</a></td><td>no</td></tr>
+<tr><td>dataSource</td><td>A String or Object defining the data source to query, very similar to a table in a relational database. See <a href="/docs/0.21.0/querying/datasource.html">DataSource</a> for more information.</td><td>yes</td></tr>
+<tr><td>dimensions</td><td>A JSON list of <a href="/docs/0.21.0/querying/dimensionspecs.html">DimensionSpec</a> (Notice that property is optional)</td><td>no</td></tr>
+<tr><td>limitSpec</td><td>See <a href="/docs/0.21.0/querying/limitspec.html">LimitSpec</a></td><td>no</td></tr>
+<tr><td>having</td><td>See <a href="/docs/0.21.0/querying/having.html">Having</a></td><td>no</td></tr>
+<tr><td>granularity</td><td>A period granularity; See <a href="/docs/0.21.0/querying/granularities.html#period-granularities">Period Granularities</a></td><td>yes</td></tr>
+<tr><td>filter</td><td>See <a href="/docs/0.21.0/querying/filters.html">Filters</a></td><td>no</td></tr>
+<tr><td>aggregations</td><td>Aggregations forms the input to Averagers; See <a href="/docs/0.21.0/querying/aggregations.html">Aggregations</a></td><td>yes</td></tr>
+<tr><td>postAggregations</td><td>Supports only aggregations as input; See <a href="/docs/0.21.0/querying/post-aggregations.html">Post Aggregations</a></td><td>no</td></tr>
 <tr><td>intervals</td><td>A JSON Object representing ISO-8601 Intervals. This defines the time ranges to run the query over.</td><td>yes</td></tr>
 <tr><td>context</td><td>An additional JSON Object which can be used to specify certain flags.</td><td>no</td></tr>
 <tr><td>averagers</td><td>Defines the moving average function; See <a href="#averagers">Averagers</a></td><td>yes</td></tr>
-<tr><td>postAveragers</td><td>Support input of both averagers and aggregations; Syntax is identical to postAggregations (See <a href="/docs/latest/querying/post-aggregations.html">Post Aggregations</a>)</td><td>no</td></tr>
+<tr><td>postAveragers</td><td>Support input of both averagers and aggregations; Syntax is identical to postAggregations (See <a href="/docs/0.21.0/querying/post-aggregations.html">Post Aggregations</a>)</td><td>no</td></tr>
 </tbody>
 </table>
 <h2><a class="anchor" aria-hidden="true" id="averagers"></a><a href="#averagers" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.6 [...]
@@ -190,7 +190,7 @@ A prime example would be weekly buckets, resulting in a Day of Week calculation.
 <p>Within each output record, the averager will compute the result over the following buckets: current (#0), #7, #14, #21.
 Whereas without specifying cycleSize it would have computed over all 28 buckets.</p>
 <h2><a class="anchor" aria-hidden="true" id="examples"></a><a href="#examples" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64  [...]
-<p>All examples are based on the Wikipedia dataset provided in the Druid <a href="/docs/latest/tutorials/index.html">tutorials</a>.</p>
+<p>All examples are based on the Wikipedia dataset provided in the Druid <a href="/docs/0.21.0/tutorials/index.html">tutorials</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="basic-example"></a><a href="#basic-example" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
 <p>Calculating a 7-buckets moving average for Wikipedia edit deltas.</p>
 <p>Query syntax:</p>
@@ -369,7 +369,7 @@ Whereas without specifying cycleSize it would have computed over all 28 buckets.
   ]
 }
 </code></pre>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-contrib/momentsketch-quantiles.html"><span class="arrow-prev">← </span><span>Moment Sketches for Approximate Quantiles module</span></a><a class="docs-next button" href="/docs/latest/development/extensions-contrib/opentsdb-emitter.html"><span class="function-name-prevnext">OpenTSDB Emitter</span><span class="arrow-next"> →</span></a></div></div></div><nav class="o [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-contrib/momentsketch-quantiles.html"><span class="arrow-prev">← </span><span>Moment Sketches for Approximate Quantiles module</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-contrib/opentsdb-emitter.html"><span class="function-name-prevnext">OpenTSDB Emitter</span><span class="arrow-next"> →</span></a></div></div></div><nav class="o [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -386,6 +386,6 @@ Whereas without specifying cycleSize it would have computed over all 28 buckets.
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-contrib/opentsdb-emitter.html b/docs/0.21.0/development/extensions-contrib/opentsdb-emitter.html
similarity index 52%
copy from docs/latest/development/extensions-contrib/opentsdb-emitter.html
copy to docs/0.21.0/development/extensions-contrib/opentsdb-emitter.html
index 9156402..215c0da 100644
--- a/docs/latest/development/extensions-contrib/opentsdb-emitter.html
+++ b/docs/0.21.0/development/extensions-contrib/opentsdb-emitter.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>OpenTSDB Emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/opentsdb-emitter.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:ver [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>OpenTSDB Emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-contrib/opentsdb-emitter.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:ver [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,9 +77,9 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>To use this Apache Druid extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>opentsdb-emitter</code> extension.</p>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>opentsdb-emitter</code> extension.</p>
 <h2><a class="anchor" aria-hidden="true" id="introduction"></a><a href="#introduction" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83. [...]
-<p>This extension emits druid metrics to <a href="https://github.com/OpenTSDB/opentsdb">OpenTSDB</a> over HTTP (Using <code>Jersey client</code>). And this emitter only emits service metric events to OpenTSDB (See <a href="/docs/latest/operations/metrics.html">Druid metrics</a> for a list of metrics).</p>
+<p>This extension emits druid metrics to <a href="https://github.com/OpenTSDB/opentsdb">OpenTSDB</a> over HTTP (Using <code>Jersey client</code>). And this emitter only emits service metric events to OpenTSDB (See <a href="/docs/0.21.0/operations/metrics.html">Druid metrics</a> for a list of metrics).</p>
 <h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
 <p>All the configuration parameters for the OpenTSDB emitter are under <code>druid.emitter.opentsdb</code>.</p>
 <table>
@@ -109,7 +109,7 @@ e.g.</p>
 ]
 </code></pre>
 <p>For most use-cases, the default configuration is sufficient.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-contrib/moving-average-query.html"><span class="arrow-prev">← </span><span>Moving Average Query</span></a><a class="docs-next button" href="/docs/latest/development/extensions-contrib/redis-cache.html"><span>Druid Redis Cache</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#introduction">In [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-contrib/moving-average-query.html"><span class="arrow-prev">← </span><span>Moving Average Query</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-contrib/redis-cache.html"><span>Druid Redis Cache</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#introduction">In [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -126,6 +126,6 @@ e.g.</p>
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/development/extensions-contrib/orc.html b/docs/0.21.0/development/extensions-contrib/orc.html
new file mode 100644
index 0000000..f5c91cf
--- /dev/null
+++ b/docs/0.21.0/development/extensions-contrib/orc.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../extensions-core/orc.html">
+<meta http-equiv="refresh" content="0; url=../extensions-core/orc.html">
+<h1>Redirecting...</h1>
+<a href="../extensions-core/orc.html">Click here if you are not redirected.</a>
+<script>location="../extensions-core/orc.html"</script>
diff --git a/docs/0.21.0/development/extensions-contrib/parquet.html b/docs/0.21.0/development/extensions-contrib/parquet.html
new file mode 100644
index 0000000..edc7307
--- /dev/null
+++ b/docs/0.21.0/development/extensions-contrib/parquet.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../../development/extensions-core/parquet.html">
+<meta http-equiv="refresh" content="0; url=../../development/extensions-core/parquet.html">
+<h1>Redirecting...</h1>
+<a href="../../development/extensions-core/parquet.html">Click here if you are not redirected.</a>
+<script>location="../../development/extensions-core/parquet.html"</script>
diff --git a/docs/0.21.0/development/extensions-contrib/rabbitmq.html b/docs/0.21.0/development/extensions-contrib/rabbitmq.html
new file mode 100644
index 0000000..4d4bfd2
--- /dev/null
+++ b/docs/0.21.0/development/extensions-contrib/rabbitmq.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../../ingestion/standalone-realtime.html">
+<meta http-equiv="refresh" content="0; url=../../ingestion/standalone-realtime.html">
+<h1>Redirecting...</h1>
+<a href="../../ingestion/standalone-realtime.html">Click here if you are not redirected.</a>
+<script>location="../../ingestion/standalone-realtime.html"</script>
diff --git a/docs/latest/development/extensions-contrib/redis-cache.html b/docs/0.21.0/development/extensions-contrib/redis-cache.html
similarity index 56%
copy from docs/latest/development/extensions-contrib/redis-cache.html
copy to docs/0.21.0/development/extensions-contrib/redis-cache.html
index 965693a..a4c8e3d 100644
--- a/docs/latest/development/extensions-contrib/redis-cache.html
+++ b/docs/0.21.0/development/extensions-contrib/redis-cache.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Druid Redis Cache · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/redis-cache.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Druid Redis Cache · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-contrib/redis-cache.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -80,16 +80,16 @@
 <p>A cache implementation for Druid based on <a href="https://github.com/redis/redis">Redis</a>.</p>
 <p>Below are guidance and configuration options known to this module.</p>
 <h2><a class="anchor" aria-hidden="true" id="installation"></a><a href="#installation" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83. [...]
-<p>Use <a href="/docs/latest/operations/pull-deps.html">pull-deps</a> tool shipped with Druid to install this <a href="/docs/latest/development/extensions.html#community-extensions">extension</a> on broker, historical and middle manager nodes.</p>
+<p>Use <a href="/docs/0.21.0/operations/pull-deps.html">pull-deps</a> tool shipped with Druid to install this <a href="/docs/0.21.0/development/extensions.html#community-extensions">extension</a> on broker, historical and middle manager nodes.</p>
 <pre><code class="hljs css language-bash">java -classpath <span class="hljs-string">"druid_dir/lib/*"</span> org.apache.druid.cli.Main tools pull-deps -c org.apache.druid.extensions.contrib:druid-redis-cache:{VERSION}
 </code></pre>
 <h2><a class="anchor" aria-hidden="true" id="enabling"></a><a href="#enabling" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64  [...]
 <p>To enable this extension after installation,</p>
 <ol>
-<li><a href="/docs/latest/development/extensions.html#loading-extensions">include</a> this <code>druid-redis-cache</code> extension</li>
-<li>to enable cache on broker nodes, follow <a href="../../configuration/index.html#broker-caching">broker caching docs</a> to set related properties</li>
-<li>to enable cache on historical nodes, follow <a href="../../configuration/index.html#historical-caching">historical caching docs</a> to set related properties</li>
-<li>to enable cache on middle manager nodes, follow <a href="../../configuration/index.html#peon-caching">peon caching docs</a> to set related properties</li>
+<li><a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> this <code>druid-redis-cache</code> extension</li>
+<li>to enable cache on broker nodes, follow <a href="/docs/0.21.0/configuration/index.html#broker-caching">broker caching docs</a> to set related properties</li>
+<li>to enable cache on historical nodes, follow <a href="/docs/0.21.0/configuration/index.html#historical-caching">historical caching docs</a> to set related properties</li>
+<li>to enable cache on middle manager nodes, follow <a href="/docs/0.21.0/configuration/index.html#peon-caching">peon caching docs</a> to set related properties</li>
 <li>set <code>druid.cache.type</code> to <code>redis</code></li>
 <li>add the following properties</li>
 </ol>
@@ -157,7 +157,7 @@
 <tr><td><code>query/cache/redis/*/requests</code></td><td>Count of requests to redis cache</td><td>whatever request to redis will increase request count by 1</td></tr>
 </tbody>
 </table>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-contrib/opentsdb-emitter.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">OpenTSDB Emitter</span></a><a class="docs-next button" href="/docs/latest/development/extensions-contrib/sqlserver.html"><span>Microsoft SQLServer</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a  [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-contrib/opentsdb-emitter.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">OpenTSDB Emitter</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-contrib/sqlserver.html"><span>Microsoft SQLServer</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a  [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -174,6 +174,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/development/extensions-contrib/rocketmq.html b/docs/0.21.0/development/extensions-contrib/rocketmq.html
new file mode 100644
index 0000000..4d4bfd2
--- /dev/null
+++ b/docs/0.21.0/development/extensions-contrib/rocketmq.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../../ingestion/standalone-realtime.html">
+<meta http-equiv="refresh" content="0; url=../../ingestion/standalone-realtime.html">
+<h1>Redirecting...</h1>
+<a href="../../ingestion/standalone-realtime.html">Click here if you are not redirected.</a>
+<script>location="../../ingestion/standalone-realtime.html"</script>
diff --git a/docs/0.21.0/development/extensions-contrib/scan-query.html b/docs/0.21.0/development/extensions-contrib/scan-query.html
new file mode 100644
index 0000000..38ab2db
--- /dev/null
+++ b/docs/0.21.0/development/extensions-contrib/scan-query.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../../querying/scan-query.html">
+<meta http-equiv="refresh" content="0; url=../../querying/scan-query.html">
+<h1>Redirecting...</h1>
+<a href="../../querying/scan-query.html">Click here if you are not redirected.</a>
+<script>location="../../querying/scan-query.html"</script>
diff --git a/docs/0.21.0/development/extensions-contrib/sqlserver.html b/docs/0.21.0/development/extensions-contrib/sqlserver.html
new file mode 100644
index 0000000..429ad8f
--- /dev/null
+++ b/docs/0.21.0/development/extensions-contrib/sqlserver.html
@@ -0,0 +1,132 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Microsoft SQLServer · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-contrib/sqlserver.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version [...]
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            var coll = document.getElementsByClassName('collapsible');
+            var checkActiveCategory = true;
+            for (var i = 0; i < coll.length; i++) {
+              var links = coll[i].nextElementSibling.getElementsByTagName('*');
+              if (checkActiveCategory){
+                for (var j = 0; j < links.length; j++) {
+                  if (links[j].classList.contains('navListItemActive')){
+                    coll[i].nextElementSibling.classList.toggle('hide');
+                    coll[i].childNodes[1].classList.toggle('rotate');
+                    checkActiveCategory = false;
+                    break;
+                  }
+                }
+              }
+
+              coll[i].addEventListener('click', function() {
+                var arrow = this.childNodes[1];
+                arrow.classList.toggle('rotate');
+                var content = this.nextElementSibling;
+                content.classList.toggle('hide');
+              });
+            }
+
+            document.addEventListener('DOMContentLoaded', function() {
+              createToggler('#navToggler', '#docsNav', 'docsSliderActive');
+              createToggler('#tocToggler', 'body', 'tocActive');
+
+              var headings = document.querySelector('.toc-headings');
+              headings && headings.addEventListener('click', function(event) {
+                var el = event.target;
+                while(el !== headings){
+                  if (el.tagName === 'A') {
+                    document.body.classList.remove('tocActive');
+                    break;
+                  } else{
+                    el = el.parentNode;
+                  }
+                }
+              }, false);
+
+              function createToggler(togglerSelector, targetSelector, className) {
+                var toggler = document.querySelector(togglerSelector);
+                var target = document.querySelector(targetSelector);
+
+                if (!toggler) {
+                  return;
+                }
+
+                toggler.onclick = function(event) {
+                  event.preventDefault();
+
+                  target.classList.toggle(className);
+                };
+              }
+            });
+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/development/extensions-contrib/sqlserver.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Microsoft SQLServer</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>sqlserver-metadata-storage</code> as an extension.</p>
+<h2><a class="anchor" aria-hidden="true" id="setting-up-sqlserver"></a><a href="#setting-up-sqlserver" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1 [...]
+<ol>
+<li><p>Install Microsoft SQLServer</p></li>
+<li><p>Create a druid database and user</p></li>
+</ol>
+<p>Create the druid user</p>
+<ul>
+<li>Microsoft SQL Server Management Studio - Security - Logins - New Login...</li>
+<li>Create a druid user, enter <code>diurd</code> when prompted for the password.</li>
+</ul>
+<p>Create a druid database owned by the user we just created</p>
+<ul>
+<li>Databases - New Database</li>
+<li>Database Name: druid, Owner: druid</li>
+</ul>
+<ol start="3">
+<li>Add the Microsoft JDBC library to the Druid classpath</li>
+</ol>
+<ul>
+<li>To ensure the com.microsoft.sqlserver.jdbc.SQLServerDriver class is loaded you will have to add the appropriate Microsoft JDBC library (sqljdbc*.jar) to the Druid classpath.</li>
+<li>For instance, if all jar files in your &quot;druid/lib&quot; directory are automatically added to your Druid classpath, then manually download the Microsoft JDBC drivers from ( <a href="https://www.microsoft.com/en-ca/download/details.aspx?id=11774">https://www.microsoft.com/en-ca/download/details.aspx?id=11774</a>) and drop it into my druid/lib directory.</li>
+</ul>
+<ol start="4">
+<li>Configure your Druid metadata storage extension:</li>
+</ol>
+<p>Add the following parameters to your Druid configuration, replacing <code>&lt;host&gt;</code>
+with the location (host name and port) of the database.</p>
+<pre><code class="hljs css language-properties"><span class="hljs-meta">druid.metadata.storage.type</span>=<span class="hljs-string">sqlserver</span>
+<span class="hljs-meta">druid.metadata.storage.connector.connectURI</span>=<span class="hljs-string">jdbc:sqlserver://&lt;host&gt;;databaseName=druid</span>
+<span class="hljs-meta">druid.metadata.storage.connector.user</span>=<span class="hljs-string">druid</span>
+<span class="hljs-meta">druid.metadata.storage.connector.password</span>=<span class="hljs-string">diurd</span>
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-contrib/redis-cache.html"><span class="arrow-prev">← </span><span>Druid Redis Cache</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-contrib/statsd.html"><span class="function-name-prevnext">StatsD Emitter</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#setti [...]
+                document.addEventListener('keyup', function(e) {
+                  if (e.target !== document.body) {
+                    return;
+                  }
+                  // keyCode for '/' (slash)
+                  if (e.keyCode === 191) {
+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
+                apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
+                indexName: 'apache_druid',
+                inputSelector: '#search_input_react',
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
+              });
+            </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-contrib/statsd.html b/docs/0.21.0/development/extensions-contrib/statsd.html
similarity index 53%
copy from docs/latest/development/extensions-contrib/statsd.html
copy to docs/0.21.0/development/extensions-contrib/statsd.html
index 67a7868..e8add74 100644
--- a/docs/latest/development/extensions-contrib/statsd.html
+++ b/docs/0.21.0/development/extensions-contrib/statsd.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>StatsD Emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/statsd.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" conten [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>StatsD Emitter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-contrib/statsd.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" conten [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,7 +77,7 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>To use this Apache Druid extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>statsd-emitter</code> extension.</p>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>statsd-emitter</code> extension.</p>
 <h2><a class="anchor" aria-hidden="true" id="introduction"></a><a href="#introduction" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83. [...]
 <p>This extension emits druid metrics to a StatsD server.
 (<a href="https://github.com/etsy/statsd">https://github.com/etsy/statsd</a>)
@@ -99,7 +99,7 @@
 <tr><td><code>druid.emitter.statsd.dogstatsd</code></td><td>Flag to enable <a href="https://docs.datadoghq.com/developers/dogstatsd/">DogStatsD</a> support. Causes dimensions to be included as tags, not as a part of the metric name. <code>convertRange</code> fields will be ignored.</td><td>no</td><td>false</td></tr>
 <tr><td><code>druid.emitter.statsd.dogstatsdConstantTags</code></td><td>If <code>druid.emitter.statsd.dogstatsd</code> is true, the tags in the JSON list of strings will be sent with every event.</td><td>no</td><td>[]</td></tr>
 <tr><td><code>druid.emitter.statsd.dogstatsdServiceAsTag</code></td><td>If <code>druid.emitter.statsd.dogstatsd</code> and <code>druid.emitter.statsd.dogstatsdServiceAsTag</code> are true, druid service (e.g. <code>druid/broker</code>, <code>druid/coordinator</code>, etc) is reported as a tag (e.g. <code>druid_service:druid/broker</code>) instead of being included in metric name (e.g. <code>druid.broker.query.time</code>) and <code>druid</code> is used as metric prefix (e.g. <code>druid. [...]
-<tr><td><code>druid.emitter.statsd.dogstatsdEvents</code></td><td>If <code>druid.emitter.statsd.dogstatsd</code> and <code>druid.emitter.statsd.dogstatsdEvents</code> are true, <a href="../../operations/alerts.html">Alert events</a> are reported to DogStatsD.</td><td>no</td><td>false</td></tr>
+<tr><td><code>druid.emitter.statsd.dogstatsdEvents</code></td><td>If <code>druid.emitter.statsd.dogstatsd</code> and <code>druid.emitter.statsd.dogstatsdEvents</code> are true, <a href="/docs/0.21.0/operations/alerts.html">Alert events</a> are reported to DogStatsD.</td><td>no</td><td>false</td></tr>
 </tbody>
 </table>
 <h3><a class="anchor" aria-hidden="true" id="druid-to-statsd-event-converter"></a><a href="#druid-to-statsd-event-converter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 [...]
@@ -118,7 +118,7 @@ the service name.
 e.g.
 <code>&quot;coordinator-segment/count&quot; : { &quot;dimensions&quot; : [&quot;dataSource&quot;], &quot;type&quot; : &quot;gauge&quot; }, &quot;historical-segment/count&quot; : { &quot;dimensions&quot; : [&quot;dataSource&quot;, &quot;tier&quot;, &quot;priority&quot;], &quot;type&quot; : &quot;gauge&quot; }</code></p>
 <p>For most use-cases, the default mapping is sufficient.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-contrib/sqlserver.html"><span class="arrow-prev">← </span><span>Microsoft SQLServer</span></a><a class="docs-next button" href="/docs/latest/development/extensions-contrib/tdigestsketch-quantiles.html"><span>T-Digest Quantiles Sketch module</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#i [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-contrib/sqlserver.html"><span class="arrow-prev">← </span><span>Microsoft SQLServer</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-contrib/tdigestsketch-quantiles.html"><span>T-Digest Quantiles Sketch module</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#i [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -135,6 +135,6 @@ e.g.
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-contrib/tdigestsketch-quantiles.html b/docs/0.21.0/development/extensions-contrib/tdigestsketch-quantiles.html
similarity index 56%
copy from docs/latest/development/extensions-contrib/tdigestsketch-quantiles.html
copy to docs/0.21.0/development/extensions-contrib/tdigestsketch-quantiles.html
index 55f0fd2..6f91c24 100644
--- a/docs/latest/development/extensions-contrib/tdigestsketch-quantiles.html
+++ b/docs/0.21.0/development/extensions-contrib/tdigestsketch-quantiles.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>T-Digest Quantiles Sketch module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/tdigestsketch-quantiles.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><m [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>T-Digest Quantiles Sketch module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-contrib/tdigestsketch-quantiles.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><m [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
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             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -87,7 +87,7 @@ While one can generate sketches on the fly during the query time itself, it gene
 to generate sketches during ingestion time itself and then combining them during query time.
 The module also provides a postAggregator, quantilesFromTDigestSketch, that can be used to compute approximate
 quantiles from T-Digest sketches generated by the tDigestSketch aggregator.</p>
-<p>To use this aggregator, make sure you <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> the extension in your config file:</p>
+<p>To use this aggregator, make sure you <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> the extension in your config file:</p>
 <pre><code class="hljs"><span class="hljs-attr">druid.extensions.loadList</span>=[<span class="hljs-string">"druid-tdigestsketch"</span>]
 </code></pre>
 <h3><a class="anchor" aria-hidden="true" id="aggregator"></a><a href="#aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1 [...]
@@ -190,7 +190,7 @@ combining pre-generated T-Digest sketches.</p>
 <tr><td>fraction</td><td>Decimal value between 0 and 1</td><td>yes</td></tr>
 </tbody>
 </table>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-contrib/statsd.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">StatsD Emitter</span></a><a class="docs-next button" href="/docs/latest/development/extensions-contrib/thrift.html"><span>Thrift</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="foot [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-contrib/statsd.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">StatsD Emitter</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-contrib/thrift.html"><span>Thrift</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="foot [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -207,6 +207,6 @@ combining pre-generated T-Digest sketches.</p>
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-contrib/thrift.html b/docs/0.21.0/development/extensions-contrib/thrift.html
similarity index 51%
copy from docs/latest/development/extensions-contrib/thrift.html
copy to docs/0.21.0/development/extensions-contrib/thrift.html
index de4889a..c63e289 100644
--- a/docs/latest/development/extensions-contrib/thrift.html
+++ b/docs/0.21.0/development/extensions-contrib/thrift.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Thrift · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/thrift.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20. [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Thrift · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-contrib/thrift.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21. [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,7 +77,7 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>To use this Apache Druid extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>druid-thrift-extensions</code>.</p>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-thrift-extensions</code>.</p>
 <p>This extension enables Druid to ingest thrift compact data online (<code>ByteBuffer</code>) and offline (SequenceFile of type <code>&lt;Writable, BytesWritable&gt;</code> or LzoThriftBlock File).</p>
 <p>You may want to use another version of thrift, change the dependency in pom and compile yourself.</p>
 <h2><a class="anchor" aria-hidden="true" id="lzo-support"></a><a href="#lzo-support" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42 [...]
@@ -135,7 +135,7 @@
   }
 }
 </code></pre>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-contrib/tdigestsketch-quantiles.html"><span class="arrow-prev">← </span><span>T-Digest Quantiles Sketch module</span></a><a class="docs-next button" href="/docs/latest/development/extensions-contrib/time-min-max.html"><span>Timestamp Min/Max aggregators</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><l [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-contrib/tdigestsketch-quantiles.html"><span class="arrow-prev">← </span><span>T-Digest Quantiles Sketch module</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-contrib/time-min-max.html"><span>Timestamp Min/Max aggregators</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><l [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -152,6 +152,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-contrib/time-min-max.html b/docs/0.21.0/development/extensions-contrib/time-min-max.html
similarity index 55%
copy from docs/latest/development/extensions-contrib/time-min-max.html
copy to docs/0.21.0/development/extensions-contrib/time-min-max.html
index 777e4c6..0b2b1a1 100644
--- a/docs/latest/development/extensions-contrib/time-min-max.html
+++ b/docs/0.21.0/development/extensions-contrib/time-min-max.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Timestamp Min/Max aggregators · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-contrib/time-min-max.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docs [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Timestamp Min/Max aggregators · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-contrib/time-min-max.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docs [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,7 +77,7 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>To use this Apache Druid extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>druid-time-min-max</code>.</p>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-time-min-max</code>.</p>
 <p>These aggregators enable more precise calculation of min and max time of given events than <code>__time</code> column whose granularity is sparse, the same as query granularity.
 To use this feature, a &quot;timeMin&quot; or &quot;timeMax&quot; aggregator must be included at indexing time.
 They can apply to any columns that can be converted to timestamp, which include Long, DateTime, Timestamp, and String types.</p>
@@ -140,7 +140,7 @@ They can apply to any columns that can be converted to timestamp, which include
 <span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T00:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z A <span class="hljs-number">2</span> <span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T03:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z <span class="hljs-number">2015</span><span class="hljs-number">-07</span><s [...]
 <span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T00:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z C <span class="hljs-number">2</span> <span class="hljs-number">2015</span><span class="hljs-number">-07</span><span class="hljs-number">-29</span>T01:<span class="hljs-number">00</span>:<span class="hljs-number">00.000</span>Z <span class="hljs-number">2015</span><span class="hljs-number">-07</span><s [...]
 </code></pre>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-contrib/thrift.html"><span class="arrow-prev">← </span><span>Thrift</span></a><a class="docs-next button" href="/docs/latest/development/extensions-contrib/gce-extensions.html"><span>GCE Extensions</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="contain [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-contrib/thrift.html"><span class="arrow-prev">← </span><span>Thrift</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-contrib/gce-extensions.html"><span>GCE Extensions</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="contain [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -157,6 +157,6 @@ They can apply to any columns that can be converted to timestamp, which include
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/approximate-histograms.html b/docs/0.21.0/development/extensions-core/approximate-histograms.html
similarity index 72%
copy from docs/latest/development/extensions-core/approximate-histograms.html
copy to docs/0.21.0/development/extensions-core/approximate-histograms.html
index a916d7a..b4295b1 100644
--- a/docs/latest/development/extensions-core/approximate-histograms.html
+++ b/docs/0.21.0/development/extensions-core/approximate-histograms.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Approximate Histogram aggregators · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/approximate-histograms.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Approximate Histogram aggregators · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/approximate-histograms.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,12 +77,12 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>To use this Apache Druid extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>druid-histogram</code> as an extension.</p>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-histogram</code> as an extension.</p>
 <p>The <code>druid-histogram</code> extension provides an approximate histogram aggregator and a fixed buckets histogram aggregator.</p>
 <p><a name="approximate-histogram-aggregator"></a></p>
 <h2><a class="anchor" aria-hidden="true" id="approximate-histogram-aggregator-deprecated"></a><a href="#approximate-histogram-aggregator-deprecated" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h [...]
 <blockquote>
-<p>The Approximate Histogram aggregator is deprecated. Please use <a href="/docs/latest/development/extensions-core/datasketches-quantiles.html">DataSketches Quantiles</a> instead which provides a superior distribution-independent algorithm with formal error guarantees.</p>
+<p>The Approximate Histogram aggregator is deprecated. Please use <a href="/docs/0.21.0/development/extensions-core/datasketches-quantiles.html">DataSketches Quantiles</a> instead which provides a superior distribution-independent algorithm with formal error guarantees.</p>
 </blockquote>
 <p>This aggregator is based on
 <a href="http://jmlr.org/papers/volume11/ben-haim10a/ben-haim10a.pdf">http://jmlr.org/papers/volume11/ben-haim10a/ben-haim10a.pdf</a>
@@ -154,7 +154,7 @@ query.</p>
 <p>This histogram supports the min/max/quantiles post-aggregators but does not support the bucketing post-aggregators.</p>
 <h3><a class="anchor" aria-hidden="true" id="when-to-use"></a><a href="#when-to-use" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42 [...]
 <p>The accuracy/usefulness of the fixed buckets histogram is extremely data-dependent; it is provided to support special use cases where the user has a great deal of prior information about the data being aggregated and knows that a fixed buckets implementation is suitable.</p>
-<p>For general histogram and quantile use cases, the <a href="/docs/latest/development/extensions-core/datasketches-quantiles.html">DataSketches Quantiles Sketch</a> extension is recommended.</p>
+<p>For general histogram and quantile use cases, the <a href="/docs/0.21.0/development/extensions-core/datasketches-quantiles.html">DataSketches Quantiles Sketch</a> extension is recommended.</p>
 <h3><a class="anchor" aria-hidden="true" id="properties"></a><a href="#properties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1 [...]
 <table>
 <thead>
@@ -303,7 +303,7 @@ Bucket intervals are based on the range of the underlying data. This aggregator
 <pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span> : <span class="hljs-string">"quantiles"</span>, <span class="hljs-attr">"name"</span> : &lt;output_name&gt;, <span class="hljs-attr">"fieldName"</span> : &lt;aggregator_name&gt;,
   <span class="hljs-attr">"probabilities"</span> : [ &lt;quantile&gt;, &lt;quantile&gt;, ... ] }
 </code></pre>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/design/peons.html"><span class="arrow-prev">← </span><span>Peons</span></a><a class="docs-next button" href="/docs/latest/development/extensions-core/avro.html"><span>Apache Avro</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#approximate-histogram-aggregator-deprecated">Approximate Histogram aggregator (Depreca [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/design/peons.html"><span class="arrow-prev">← </span><span>Peons</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/avro.html"><span>Apache Avro</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#approximate-histogram-aggregator-deprecated">Approximate Histogram aggregator (Depreca [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -320,6 +320,6 @@ Bucket intervals are based on the range of the underlying data. This aggregator
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/development/extensions-core/avro.html b/docs/0.21.0/development/extensions-core/avro.html
new file mode 100644
index 0000000..a195386
--- /dev/null
+++ b/docs/0.21.0/development/extensions-core/avro.html
@@ -0,0 +1,116 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Apache Avro · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/avro.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21. [...]
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            var coll = document.getElementsByClassName('collapsible');
+            var checkActiveCategory = true;
+            for (var i = 0; i < coll.length; i++) {
+              var links = coll[i].nextElementSibling.getElementsByTagName('*');
+              if (checkActiveCategory){
+                for (var j = 0; j < links.length; j++) {
+                  if (links[j].classList.contains('navListItemActive')){
+                    coll[i].nextElementSibling.classList.toggle('hide');
+                    coll[i].childNodes[1].classList.toggle('rotate');
+                    checkActiveCategory = false;
+                    break;
+                  }
+                }
+              }
+
+              coll[i].addEventListener('click', function() {
+                var arrow = this.childNodes[1];
+                arrow.classList.toggle('rotate');
+                var content = this.nextElementSibling;
+                content.classList.toggle('hide');
+              });
+            }
+
+            document.addEventListener('DOMContentLoaded', function() {
+              createToggler('#navToggler', '#docsNav', 'docsSliderActive');
+              createToggler('#tocToggler', 'body', 'tocActive');
+
+              var headings = document.querySelector('.toc-headings');
+              headings && headings.addEventListener('click', function(event) {
+                var el = event.target;
+                while(el !== headings){
+                  if (el.tagName === 'A') {
+                    document.body.classList.remove('tocActive');
+                    break;
+                  } else{
+                    el = el.parentNode;
+                  }
+                }
+              }, false);
+
+              function createToggler(togglerSelector, targetSelector, className) {
+                var toggler = document.querySelector(togglerSelector);
+                var target = document.querySelector(targetSelector);
+
+                if (!toggler) {
+                  return;
+                }
+
+                toggler.onclick = function(event) {
+                  event.preventDefault();
+
+                  target.classList.toggle(className);
+                };
+              }
+            });
+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/development/extensions-core/avro.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Apache Avro</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<h2><a class="anchor" aria-hidden="true" id="avro-extension"></a><a href="#avro-extension" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0- [...]
+<p>This Apache Druid extension enables Druid to ingest and understand the Apache Avro data format. This extension provides
+two Avro Parsers for stream ingestion and Hadoop batch ingestion.
+See <a href="/docs/0.21.0/ingestion/data-formats.html#avro-hadoop-parser">Avro Hadoop Parser</a> and <a href="/docs/0.21.0/ingestion/data-formats.html#avro-stream-parser">Avro Stream Parser</a>
+for more details about how to use these in an ingestion spec.</p>
+<p>Additionally, it provides an InputFormat for reading Avro OCF files when using
+<a href="/docs/0.21.0/ingestion/native-batch.html">native batch indexing</a>, see <a href="/docs/0.21.0/ingestion/data-formats.html#avro-ocf">Avro OCF</a>
+for details on how to ingest OCF files.</p>
+<p>Make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-avro-extensions</code> as an extension.</p>
+<h3><a class="anchor" aria-hidden="true" id="avro-types"></a><a href="#avro-types" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1 [...]
+<p>Druid supports most Avro types natively, there are however some exceptions which are detailed here.</p>
+<p><code>union</code> types which aren't of the form <code>[null, otherType]</code> aren't supported at this time.</p>
+<p><code>bytes</code> and <code>fixed</code> Avro types will be returned by default as base64 encoded strings unless the <code>binaryAsString</code> option is enabled on the Avro parser.
+This setting will decode these types as UTF-8 strings.</p>
+<p><code>enum</code> types will be returned as <code>string</code> of the enum symbol.</p>
+<p><code>record</code> and <code>map</code> types representing nested data can be ingested using <a href="/docs/0.21.0/ingestion/data-formats.html#flattenspec">flattenSpec</a> on the parser.</p>
+<p>Druid doesn't currently support Avro logical types, they will be ignored and fields will be handled according to the underlying primitive type.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/approximate-histograms.html"><span class="arrow-prev">← </span><span>Approximate Histogram aggregators</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/azure.html"><span>Microsoft Azure</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#avro-extension" [...]
+                document.addEventListener('keyup', function(e) {
+                  if (e.target !== document.body) {
+                    return;
+                  }
+                  // keyCode for '/' (slash)
+                  if (e.keyCode === 191) {
+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
+                apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
+                indexName: 'apache_druid',
+                inputSelector: '#search_input_react',
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
+              });
+            </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/development/extensions-core/azure.html b/docs/0.21.0/development/extensions-core/azure.html
new file mode 100644
index 0000000..8d1969f
--- /dev/null
+++ b/docs/0.21.0/development/extensions-core/azure.html
@@ -0,0 +1,118 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Microsoft Azure · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/azure.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content=" [...]
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            var coll = document.getElementsByClassName('collapsible');
+            var checkActiveCategory = true;
+            for (var i = 0; i < coll.length; i++) {
+              var links = coll[i].nextElementSibling.getElementsByTagName('*');
+              if (checkActiveCategory){
+                for (var j = 0; j < links.length; j++) {
+                  if (links[j].classList.contains('navListItemActive')){
+                    coll[i].nextElementSibling.classList.toggle('hide');
+                    coll[i].childNodes[1].classList.toggle('rotate');
+                    checkActiveCategory = false;
+                    break;
+                  }
+                }
+              }
+
+              coll[i].addEventListener('click', function() {
+                var arrow = this.childNodes[1];
+                arrow.classList.toggle('rotate');
+                var content = this.nextElementSibling;
+                content.classList.toggle('hide');
+              });
+            }
+
+            document.addEventListener('DOMContentLoaded', function() {
+              createToggler('#navToggler', '#docsNav', 'docsSliderActive');
+              createToggler('#tocToggler', 'body', 'tocActive');
+
+              var headings = document.querySelector('.toc-headings');
+              headings && headings.addEventListener('click', function(event) {
+                var el = event.target;
+                while(el !== headings){
+                  if (el.tagName === 'A') {
+                    document.body.classList.remove('tocActive');
+                    break;
+                  } else{
+                    el = el.parentNode;
+                  }
+                }
+              }, false);
+
+              function createToggler(togglerSelector, targetSelector, className) {
+                var toggler = document.querySelector(togglerSelector);
+                var target = document.querySelector(targetSelector);
+
+                if (!toggler) {
+                  return;
+                }
+
+                toggler.onclick = function(event) {
+                  event.preventDefault();
+
+                  target.classList.toggle(className);
+                };
+              }
+            });
+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/development/extensions-core/azure.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Microsoft Azure</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-azure-extensions</code> extension.</p>
+<h2><a class="anchor" aria-hidden="true" id="deep-storage"></a><a href="#deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83. [...]
+<p><a href="http://azure.microsoft.com/en-us/services/storage/">Microsoft Azure Storage</a> is another option for deep storage. This requires some additional Druid configuration.</p>
+<table>
+<thead>
+<tr><th>Property</th><th>Description</th><th>Possible Values</th><th>Default</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.storage.type</code></td><td>azure</td><td></td><td>Must be set.</td></tr>
+<tr><td><code>druid.azure.account</code></td><td></td><td>Azure Storage account name.</td><td>Must be set.</td></tr>
+<tr><td><code>druid.azure.key</code></td><td></td><td>Azure Storage account key.</td><td>Must be set.</td></tr>
+<tr><td><code>druid.azure.container</code></td><td></td><td>Azure Storage container name.</td><td>Must be set.</td></tr>
+<tr><td><code>druid.azure.prefix</code></td><td>A prefix string that will be prepended to the blob names for the segments published to Azure deep storage</td><td></td><td>&quot;&quot;</td></tr>
+<tr><td><code>druid.azure.protocol</code></td><td>the protocol to use</td><td>http or https</td><td>https</td></tr>
+<tr><td><code>druid.azure.maxTries</code></td><td>Number of tries before canceling an Azure operation.</td><td></td><td>3</td></tr>
+<tr><td><code>druid.azure.maxListingLength</code></td><td>maximum number of input files matching a given prefix to retrieve at a time</td><td></td><td>1024</td></tr>
+</tbody>
+</table>
+<p>See <a href="http://azure.microsoft.com/en-us/pricing/free-trial/">Azure Services</a> for more information.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/avro.html"><span class="arrow-prev">← </span><span>Apache Avro</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/bloom-filter.html"><span>Bloom Filter</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#deep-storage">Deep Storage</a></li></ul></nav></div [...]
+                document.addEventListener('keyup', function(e) {
+                  if (e.target !== document.body) {
+                    return;
+                  }
+                  // keyCode for '/' (slash)
+                  if (e.keyCode === 191) {
+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
+                apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
+                indexName: 'apache_druid',
+                inputSelector: '#search_input_react',
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
+              });
+            </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/bloom-filter.html b/docs/0.21.0/development/extensions-core/bloom-filter.html
similarity index 61%
copy from docs/latest/development/extensions-core/bloom-filter.html
copy to docs/0.21.0/development/extensions-core/bloom-filter.html
index d27fbed..e30b3af 100644
--- a/docs/latest/development/extensions-core/bloom-filter.html
+++ b/docs/0.21.0/development/extensions-core/bloom-filter.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Bloom Filter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/bloom-filter.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" conte [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Bloom Filter · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/bloom-filter.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" conte [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -78,7 +78,7 @@
   ~ under the License.
   -->
 <p>This Apache Druid extension adds the ability to both construct bloom filters from query results, and filter query results by testing
-against a bloom filter. Make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>druid-bloom-filter</code> as an
+against a bloom filter. Make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-bloom-filter</code> as an
 extension.</p>
 <p>A Bloom filter is a probabilistic data structure for performing a set membership check. A bloom filter is a good candidate
 to use with Druid for cases where an explicit filter is impossible, e.g. filtering a query against a set of millions of
@@ -123,7 +123,7 @@ String base64Serialized = Base64.encodeBase64String(byteArrayOutputStream.toByte
 <tr><td><code>type</code></td><td>Filter Type. Should always be <code>bloom</code></td><td>yes</td></tr>
 <tr><td><code>dimension</code></td><td>The dimension to filter over.</td><td>yes</td></tr>
 <tr><td><code>bloomKFilter</code></td><td>Base64 encoded Binary representation of <code>org.apache.hive.common.util.BloomKFilter</code></td><td>yes</td></tr>
-<tr><td><code>extractionFn</code></td><td><a href="../../querying/dimensionspecs.html#extraction-functions">Extraction function</a> to apply to the dimension values</td><td>no</td></tr>
+<tr><td><code>extractionFn</code></td><td><a href="/docs/0.21.0/querying/dimensionspecs.html#extraction-functions">Extraction function</a> to apply to the dimension values</td><td>no</td></tr>
 </tbody>
 </table>
 <h3><a class="anchor" aria-hidden="true" id="serialized-format-for-bloomkfilter"></a><a href="#serialized-format-for-bloomkfilter" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5 [...]
@@ -139,7 +139,7 @@ String base64Serialized = Base64.encodeBase64String(byteArrayOutputStream.toByte
 <pre><code class="hljs css language-sql"><span class="hljs-keyword">SELECT</span> <span class="hljs-keyword">COUNT</span>(*) <span class="hljs-keyword">FROM</span> druid.foo <span class="hljs-keyword">WHERE</span> bloom_filter_test(&lt;expr&gt;, <span class="hljs-string">'&lt;serialized_bytes_for_BloomKFilter&gt;'</span>)
 </code></pre>
 <h3><a class="anchor" aria-hidden="true" id="expression-and-virtual-column-support"></a><a href="#expression-and-virtual-column-support" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 [...]
-<p>The bloom filter extension also adds a bloom filter <a href="/docs/latest/misc/math-expr.html">Druid expression</a> which shares syntax
+<p>The bloom filter extension also adds a bloom filter <a href="/docs/0.21.0/misc/math-expr.html">Druid expression</a> which shares syntax
 with the SQL operator.</p>
 <pre><code class="hljs css language-sql">bloom_filter_test(&lt;expr&gt;, '&lt;serialized_bytes_for_BloomKFilter&gt;')
 </code></pre>
@@ -164,7 +164,7 @@ for the query.</p>
 <tbody>
 <tr><td><code>type</code></td><td>Aggregator Type. Should always be <code>bloom</code></td><td>yes</td></tr>
 <tr><td><code>name</code></td><td>Output field name</td><td>yes</td></tr>
-<tr><td><code>field</code></td><td><a href="/docs/latest/querying/dimensionspecs.html">DimensionSpec</a> to add to <code>org.apache.hive.common.util.BloomKFilter</code></td><td>yes</td></tr>
+<tr><td><code>field</code></td><td><a href="/docs/0.21.0/querying/dimensionspecs.html">DimensionSpec</a> to add to <code>org.apache.hive.common.util.BloomKFilter</code></td><td>yes</td></tr>
 <tr><td><code>maxNumEntries</code></td><td>Maximum number of distinct values supported by <code>org.apache.hive.common.util.BloomKFilter</code>, default <code>1500</code></td><td>no</td></tr>
 </tbody>
 </table>
@@ -201,7 +201,7 @@ added to the set. As such, ordering by an alternate aggregation is recommended i
 </code></pre>
 <p>but requires the setting <code>druid.sql.planner.serializeComplexValues</code> to be set to <code>true</code>. Bloom filter results in a SQL
 response are serialized into a base64 string, which can then be used in subsequent queries as a filter.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-core/azure.html"><span class="arrow-prev">← </span><span>Microsoft Azure</span></a><a class="docs-next button" href="/docs/latest/development/extensions-core/datasketches-extension.html"><span class="function-name-prevnext">DataSketches extension</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a hr [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/azure.html"><span class="arrow-prev">← </span><span>Microsoft Azure</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/datasketches-extension.html"><span class="function-name-prevnext">DataSketches extension</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a hr [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -218,6 +218,6 @@ response are serialized into a base64 string, which can then be used in subseque
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/development/extensions-core/caffeine-cache.html b/docs/0.21.0/development/extensions-core/caffeine-cache.html
new file mode 100644
index 0000000..1697981
--- /dev/null
+++ b/docs/0.21.0/development/extensions-core/caffeine-cache.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../../configuration/index.html#cache-configuration">
+<meta http-equiv="refresh" content="0; url=../../configuration/index.html#cache-configuration">
+<h1>Redirecting...</h1>
+<a href="../../configuration/index.html#cache-configuration">Click here if you are not redirected.</a>
+<script>location="../../configuration/index.html#cache-configuration"</script>
diff --git a/docs/0.21.0/development/extensions-core/datasketches-aggregators.html b/docs/0.21.0/development/extensions-core/datasketches-aggregators.html
new file mode 100644
index 0000000..ae4e884
--- /dev/null
+++ b/docs/0.21.0/development/extensions-core/datasketches-aggregators.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="datasketches-extension.html">
+<meta http-equiv="refresh" content="0; url=datasketches-extension.html">
+<h1>Redirecting...</h1>
+<a href="datasketches-extension.html">Click here if you are not redirected.</a>
+<script>location="datasketches-extension.html"</script>
diff --git a/docs/0.21.0/development/extensions-core/datasketches-extension.html b/docs/0.21.0/development/extensions-core/datasketches-extension.html
new file mode 100644
index 0000000..4767b4e
--- /dev/null
+++ b/docs/0.21.0/development/extensions-core/datasketches-extension.html
@@ -0,0 +1,110 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>DataSketches extension · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/datasketches-extension.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docs [...]
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            var coll = document.getElementsByClassName('collapsible');
+            var checkActiveCategory = true;
+            for (var i = 0; i < coll.length; i++) {
+              var links = coll[i].nextElementSibling.getElementsByTagName('*');
+              if (checkActiveCategory){
+                for (var j = 0; j < links.length; j++) {
+                  if (links[j].classList.contains('navListItemActive')){
+                    coll[i].nextElementSibling.classList.toggle('hide');
+                    coll[i].childNodes[1].classList.toggle('rotate');
+                    checkActiveCategory = false;
+                    break;
+                  }
+                }
+              }
+
+              coll[i].addEventListener('click', function() {
+                var arrow = this.childNodes[1];
+                arrow.classList.toggle('rotate');
+                var content = this.nextElementSibling;
+                content.classList.toggle('hide');
+              });
+            }
+
+            document.addEventListener('DOMContentLoaded', function() {
+              createToggler('#navToggler', '#docsNav', 'docsSliderActive');
+              createToggler('#tocToggler', 'body', 'tocActive');
+
+              var headings = document.querySelector('.toc-headings');
+              headings && headings.addEventListener('click', function(event) {
+                var el = event.target;
+                while(el !== headings){
+                  if (el.tagName === 'A') {
+                    document.body.classList.remove('tocActive');
+                    break;
+                  } else{
+                    el = el.parentNode;
+                  }
+                }
+              }, false);
+
+              function createToggler(togglerSelector, targetSelector, className) {
+                var toggler = document.querySelector(togglerSelector);
+                var target = document.querySelector(targetSelector);
+
+                if (!toggler) {
+                  return;
+                }
+
+                toggler.onclick = function(event) {
+                  event.preventDefault();
+
+                  target.classList.toggle(className);
+                };
+              }
+            });
+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/development/extensions-core/datasketches-extension.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">DataSketches extension</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>Apache Druid aggregators based on <a href="https://datasketches.apache.org/">Apache DataSketches</a> library. Sketches are data structures implementing approximate streaming mergeable algorithms. Sketches can be ingested from the outside of Druid or built from raw data at ingestion time. Sketches can be stored in Druid segments as additive metrics.</p>
+<p>To use the datasketches aggregators, make sure you <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> the extension in your config file:</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.extensions.loadList</span>=[<span class="hljs-string">"druid-datasketches"</span>]
+</code></pre>
+<p>The following modules are available:</p>
+<ul>
+<li><a href="/docs/0.21.0/development/extensions-core/datasketches-theta.html">Theta sketch</a> - approximate distinct counting with set operations (union, intersection and set difference).</li>
+<li><a href="/docs/0.21.0/development/extensions-core/datasketches-tuple.html">Tuple sketch</a> - extension of Theta sketch to support values associated with distinct keys (arrays of numeric values in this specialized implementation).</li>
+<li><a href="/docs/0.21.0/development/extensions-core/datasketches-quantiles.html">Quantiles sketch</a> - approximate distribution of comparable values to obtain ranks, quantiles and histograms. This is a specialized implementation for numeric values.</li>
+<li><a href="/docs/0.21.0/development/extensions-core/datasketches-hll.html">HLL sketch</a> - approximate distinct counting using very compact HLL sketch.</li>
+</ul>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/bloom-filter.html"><span class="arrow-prev">← </span><span>Bloom Filter</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/datasketches-hll.html"><span class="function-name-prevnext">DataSketches HLL Sketch module</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="n [...]
+                document.addEventListener('keyup', function(e) {
+                  if (e.target !== document.body) {
+                    return;
+                  }
+                  // keyCode for '/' (slash)
+                  if (e.keyCode === 191) {
+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
+                apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
+                indexName: 'apache_druid',
+                inputSelector: '#search_input_react',
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
+              });
+            </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/datasketches-hll.html b/docs/0.21.0/development/extensions-core/datasketches-hll.html
similarity index 56%
copy from docs/latest/development/extensions-core/datasketches-hll.html
copy to docs/0.21.0/development/extensions-core/datasketches-hll.html
index 3b06c62..6d3ce3d 100644
--- a/docs/latest/development/extensions-core/datasketches-hll.html
+++ b/docs/0.21.0/development/extensions-core/datasketches-hll.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>DataSketches HLL Sketch module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/datasketches-hll.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="do [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>DataSketches HLL Sketch module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/datasketches-hll.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="do [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -79,7 +79,7 @@
   -->
 <p>This module provides Apache Druid aggregators for distinct counting based on HLL sketch from <a href="https://datasketches.apache.org/">Apache DataSketches</a> library. At ingestion time, this aggregator creates the HLL sketch objects to be stored in Druid segments. At query time, sketches are read and merged together. In the end, by default, you receive the estimate of the number of distinct values presented to the sketch. Also, you can use post aggregator to produce a union of sketc [...]
 You can use the HLL sketch aggregator on columns of any identifiers. It will return estimated cardinality of the column.</p>
-<p>To use this aggregator, make sure you <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> the extension in your config file:</p>
+<p>To use this aggregator, make sure you <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> the extension in your config file:</p>
 <pre><code class="hljs"><span class="hljs-attr">druid.extensions.loadList</span>=[<span class="hljs-string">"druid-datasketches"</span>]
 </code></pre>
 <h3><a class="anchor" aria-hidden="true" id="aggregators"></a><a href="#aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42 [...]
@@ -153,7 +153,7 @@ This must be an integer value of 1, 2 or 3 corresponding to approximately 68.3%,
   <span class="hljs-attr">"field"</span>  : &lt;post aggregator that returns an HLL Sketch&gt;
 }
 </code></pre>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-core/datasketches-extension.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">DataSketches extension</span></a><a class="docs-next button" href="/docs/latest/development/extensions-core/datasketches-quantiles.html"><span class="function-name-prevnext">DataSketches Quantiles Sketch module</span><span class="arrow-next"> →</span></a></div> [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/datasketches-extension.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">DataSketches extension</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/datasketches-quantiles.html"><span class="function-name-prevnext">DataSketches Quantiles Sketch module</span><span class="arrow-next"> →</span></a></div> [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -170,6 +170,6 @@ This must be an integer value of 1, 2 or 3 corresponding to approximately 68.3%,
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/datasketches-quantiles.html b/docs/0.21.0/development/extensions-core/datasketches-quantiles.html
similarity index 58%
copy from docs/latest/development/extensions-core/datasketches-quantiles.html
copy to docs/0.21.0/development/extensions-core/datasketches-quantiles.html
index db6afe9..645ecee 100644
--- a/docs/latest/development/extensions-core/datasketches-quantiles.html
+++ b/docs/0.21.0/development/extensions-core/datasketches-quantiles.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>DataSketches Quantiles Sketch module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/datasketches-quantiles.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><m [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>DataSketches Quantiles Sketch module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/datasketches-quantiles.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><m [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,14 +77,14 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>This module provides Apache Druid aggregators based on numeric quantiles DoublesSketch from <a href="https://datasketches.apache.org/">Apache DataSketches</a> library. Quantiles sketch is a mergeable streaming algorithm to estimate the distribution of values, and approximately answer queries about the rank of a value, probability mass function of the distribution (PMF) or histogram, cumulative distribution function (CDF), and quantiles (median, min, max, 95th percentile and such). See [...]
+<p>This module provides Apache Druid aggregators based on numeric quantiles DoublesSketch from <a href="https://datasketches.apache.org/">Apache DataSketches</a> library. Quantiles sketch is a mergeable streaming algorithm to estimate the distribution of values, and approximately answer queries about the rank of a value, probability mass function of the distribution (PMF) or histogram, cumulative distribution function (CDF), and quantiles (median, min, max, 95th percentile and such). See [...]
 <p>There are three major modes of operation:</p>
 <ol>
 <li>Ingesting sketches built outside of Druid (say, with Pig or Hive)</li>
 <li>Building sketches from raw data during ingestion</li>
 <li>Building sketches from raw data at query time</li>
 </ol>
-<p>To use this aggregator, make sure you <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> the extension in your config file:</p>
+<p>To use this aggregator, make sure you <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> the extension in your config file:</p>
 <pre><code class="hljs"><span class="hljs-attr">druid.extensions.loadList</span>=[<span class="hljs-string">"druid-datasketches"</span>]
 </code></pre>
 <h3><a class="anchor" aria-hidden="true" id="aggregator"></a><a href="#aggregator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1 [...]
@@ -104,7 +104,7 @@
 <tr><td>type</td><td>This String should always be &quot;quantilesDoublesSketch&quot;</td><td>yes</td></tr>
 <tr><td>name</td><td>A String for the output (result) name of the calculation.</td><td>yes</td></tr>
 <tr><td>fieldName</td><td>A String for the name of the input field (can contain sketches or raw numeric values).</td><td>yes</td></tr>
-<tr><td>k</td><td>Parameter that determines the accuracy and size of the sketch. Higher k means higher accuracy but more space to store sketches. Must be a power of 2 from 2 to 32768. See the <a href="https://datasketches.apache.org/docs/Quantiles/QuantilesAccuracy.html">Quantiles Accuracy</a> for details.</td><td>no, defaults to 128</td></tr>
+<tr><td>k</td><td>Parameter that determines the accuracy and size of the sketch. Higher k means higher accuracy but more space to store sketches. Must be a power of 2 from 2 to 32768. See the <a href="https://datasketches.apache.org/docs/Quantiles/QuantilesAccuracy">Quantiles Accuracy</a> for details.</td><td>no, defaults to 128</td></tr>
 </tbody>
 </table>
 <h3><a class="anchor" aria-hidden="true" id="post-aggregators"></a><a href="#post-aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2. [...]
@@ -162,7 +162,7 @@
   <span class="hljs-attr">"field"</span>  : &lt;post aggregator that refers to a DoublesSketch (fieldAccess or another post aggregator)&gt;
 }
 </code></pre>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-core/datasketches-hll.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">DataSketches HLL Sketch module</span></a><a class="docs-next button" href="/docs/latest/development/extensions-core/datasketches-theta.html"><span class="function-name-prevnext">DataSketches Theta Sketch module</span><span class="arrow-next"> →</span></a></div></div> [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/datasketches-hll.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">DataSketches HLL Sketch module</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/datasketches-theta.html"><span class="function-name-prevnext">DataSketches Theta Sketch module</span><span class="arrow-next"> →</span></a></div></div> [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -179,6 +179,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/datasketches-theta.html b/docs/0.21.0/development/extensions-core/datasketches-theta.html
similarity index 65%
copy from docs/latest/development/extensions-core/datasketches-theta.html
copy to docs/0.21.0/development/extensions-core/datasketches-theta.html
index 4297409..9f86c70 100644
--- a/docs/latest/development/extensions-core/datasketches-theta.html
+++ b/docs/0.21.0/development/extensions-core/datasketches-theta.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>DataSketches Theta Sketch module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/datasketches-theta.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>DataSketches Theta Sketch module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/datasketches-theta.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -80,7 +80,7 @@
 <p>This module provides Apache Druid aggregators based on Theta sketch from <a href="https://datasketches.apache.org/">Apache DataSketches</a> library. Note that sketch algorithms are approximate; see details in the &quot;Accuracy&quot; section of the datasketches doc.
 At ingestion time, this aggregator creates the Theta sketch objects which get stored in Druid segments. Logically speaking, a Theta sketch object can be thought of as a Set data structure. At query time, sketches are read and aggregated (set unioned) together. In the end, by default, you receive the estimate of the number of unique entries in the sketch object. Also, you can use post aggregators to do union, intersection or difference on sketch columns in the same row.
 Note that you can use <code>thetaSketch</code> aggregator on columns which were not ingested using the same. It will return estimated cardinality of the column. It is recommended to use it at ingestion time as well to make querying faster.</p>
-<p>To use this aggregator, make sure you <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> the extension in your config file:</p>
+<p>To use this aggregator, make sure you <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> the extension in your config file:</p>
 <pre><code class="hljs"><span class="hljs-attr">druid.extensions.loadList</span>=[<span class="hljs-string">"druid-datasketches"</span>]
 </code></pre>
 <h3><a class="anchor" aria-hidden="true" id="aggregators"></a><a href="#aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42 [...]
@@ -101,7 +101,7 @@ Note that you can use <code>thetaSketch</code> aggregator on columns which were
 <tr><td>name</td><td>A String for the output (result) name of the calculation.</td><td>yes</td></tr>
 <tr><td>fieldName</td><td>A String for the name of the aggregator used at ingestion time.</td><td>yes</td></tr>
 <tr><td>isInputThetaSketch</td><td>This should only be used at indexing time if your input data contains theta sketch objects. This would be the case if you use datasketches library outside of Druid, say with Pig/Hive, to produce the data that you are ingesting into Druid</td><td>no, defaults to false</td></tr>
-<tr><td>size</td><td>Must be a power of 2. Internally, size refers to the maximum number of entries sketch object will retain. Higher size means higher accuracy but more space to store sketches. Note that after you index with a particular size, druid will persist sketch in segments and you will use size greater or equal to that at query time. See the <a href="https://datasketches.apache.org/docs/Theta/ThetaSize.html">DataSketches site</a> for details. In general, We recommend just sticki [...]
+<tr><td>size</td><td>Must be a power of 2. Internally, size refers to the maximum number of entries sketch object will retain. Higher size means higher accuracy but more space to store sketches. Note that after you index with a particular size, druid will persist sketch in segments and you will use size greater or equal to that at query time. See the <a href="https://datasketches.apache.org/docs/Theta/ThetaSize">DataSketches site</a> for details. In general, We recommend just sticking to [...]
 </tbody>
 </table>
 <h3><a class="anchor" aria-hidden="true" id="post-aggregators"></a><a href="#post-aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2. [...]
@@ -301,7 +301,7 @@ How many unique users visited both product A and product B?</p>
   <span class="hljs-attr">"intervals"</span>: [<span class="hljs-string">"2014-10-01T00:00:00.000Z/2014-10-14T00:00:00.000Z"</span>]
 }
 </code></pre>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-core/datasketches-quantiles.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">DataSketches Quantiles Sketch module</span></a><a class="docs-next button" href="/docs/latest/development/extensions-core/datasketches-tuple.html"><span class="function-name-prevnext">DataSketches Tuple Sketch module</span><span class="arrow-next"> →</span></a> [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/datasketches-quantiles.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">DataSketches Quantiles Sketch module</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/datasketches-tuple.html"><span class="function-name-prevnext">DataSketches Tuple Sketch module</span><span class="arrow-next"> →</span></a> [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -318,6 +318,6 @@ How many unique users visited both product A and product B?</p>
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/datasketches-tuple.html b/docs/0.21.0/development/extensions-core/datasketches-tuple.html
similarity index 61%
copy from docs/latest/development/extensions-core/datasketches-tuple.html
copy to docs/0.21.0/development/extensions-core/datasketches-tuple.html
index 7437763..a266593 100644
--- a/docs/latest/development/extensions-core/datasketches-tuple.html
+++ b/docs/0.21.0/development/extensions-core/datasketches-tuple.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>DataSketches Tuple Sketch module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/datasketches-tuple.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>DataSketches Tuple Sketch module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/datasketches-tuple.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -78,7 +78,7 @@
   ~ under the License.
   -->
 <p>This module provides Apache Druid aggregators based on Tuple sketch from <a href="https://datasketches.apache.org/">Apache DataSketches</a> library. ArrayOfDoublesSketch sketches extend the functionality of the count-distinct Theta sketches by adding arrays of double values associated with unique keys.</p>
-<p>To use this aggregator, make sure you <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> the extension in your config file:</p>
+<p>To use this aggregator, make sure you <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> the extension in your config file:</p>
 <pre><code class="hljs"><span class="hljs-attr">druid.extensions.loadList</span>=[<span class="hljs-string">"druid-datasketches"</span>]
 </code></pre>
 <h3><a class="anchor" aria-hidden="true" id="aggregators"></a><a href="#aggregators" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42 [...]
@@ -99,7 +99,7 @@
 <tr><td>type</td><td>This String should always be &quot;arrayOfDoublesSketch&quot;</td><td>yes</td></tr>
 <tr><td>name</td><td>A String for the output (result) name of the calculation.</td><td>yes</td></tr>
 <tr><td>fieldName</td><td>A String for the name of the input field.</td><td>yes</td></tr>
-<tr><td>nominalEntries</td><td>Parameter that determines the accuracy and size of the sketch. Higher k means higher accuracy but more space to store sketches. Must be a power of 2. See the <a href="https://datasketches.apache.org/docs/Theta/ThetaErrorTable.html">Theta sketch accuracy</a> for details.</td><td>no, defaults to 16384</td></tr>
+<tr><td>nominalEntries</td><td>Parameter that determines the accuracy and size of the sketch. Higher k means higher accuracy but more space to store sketches. Must be a power of 2. See the <a href="https://datasketches.apache.org/docs/Theta/ThetaErrorTable">Theta sketch accuracy</a> for details.</td><td>no, defaults to 16384</td></tr>
 <tr><td>numberOfValues</td><td>Number of values associated with each distinct key.</td><td>no, defaults to 1</td></tr>
 <tr><td>metricColumns</td><td>If building sketches from raw data, an array of names of the input columns containing numeric values to be associated with each distinct key.</td><td>no, defaults to empty array</td></tr>
 </tbody>
@@ -147,7 +147,7 @@
 }
 </code></pre>
 <h4><a class="anchor" aria-hidden="true" id="quantiles-sketch-from-a-column"></a><a href="#quantiles-sketch-from-a-column" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 1 [...]
-<p>Returns a quantiles DoublesSketch constructed from a given column of values from a given ArrayOfDoublesSketch using optional parameter k that determines the accuracy and size of the quantiles sketch. See <a href="datasketches-quantiles.html">Quantiles Sketch Module</a></p>
+<p>Returns a quantiles DoublesSketch constructed from a given column of values from a given ArrayOfDoublesSketch using optional parameter k that determines the accuracy and size of the quantiles sketch. See <a href="/docs/0.21.0/development/extensions-core/datasketches-quantiles.html">Quantiles Sketch Module</a></p>
 <ul>
 <li>The column number is 1-based and is optional (the default is 1).</li>
 <li>The parameter k is optional (the default is defined in the sketch library).</li>
@@ -173,7 +173,7 @@
 }
 </code></pre>
 <h4><a class="anchor" aria-hidden="true" id="students-t-test"></a><a href="#students-t-test" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5  [...]
-<p>Performs Student's t-test and returns a list of p-values given two instances of ArrayOfDoublesSketch. The result will be N double values, where N is the number of double values kept in the sketch per key. See <a href="http://commons.apache.org/proper/commons-math/javadocs/api-3.4/org/apache/commons/math3/stat/inference/TTest.html">t-test documentation</a>.</p>
+<p>Performs Student's t-test and returns a list of p-values given two instances of ArrayOfDoublesSketch. The result will be N double values, where N is the number of double values kept in the sketch per key. See <a href="http://commons.apache.org/proper/commons-math/javadocs/api-3.4/org/apache/commons/math3/stat/inference/TTest">t-test documentation</a>.</p>
 <pre><code class="hljs css language-json">{
   <span class="hljs-attr">"type"</span>  : <span class="hljs-string">"arrayOfDoublesSketchTTest"</span>,
   <span class="hljs-attr">"name"</span>: &lt;output name&gt;,
@@ -188,7 +188,7 @@
   <span class="hljs-attr">"field"</span>  : &lt;post aggregator that refers to an ArrayOfDoublesSketch (fieldAccess or another post aggregator)&gt;
 }
 </code></pre>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-core/datasketches-theta.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">DataSketches Theta Sketch module</span></a><a class="docs-next button" href="/docs/latest/development/extensions-core/druid-basic-security.html"><span>Basic Security</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><f [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/datasketches-theta.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">DataSketches Theta Sketch module</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/druid-basic-security.html"><span>Basic Security</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><f [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -205,6 +205,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/operations/kubernetes.html b/docs/0.21.0/development/extensions-core/druid-aws-rds.html
similarity index 60%
copy from docs/latest/operations/kubernetes.html
copy to docs/0.21.0/development/extensions-core/druid-aws-rds.html
index 225a170..4f6bce2 100644
--- a/docs/latest/operations/kubernetes.html
+++ b/docs/0.21.0/development/extensions-core/druid-aws-rds.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>kubernetes · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/operations/kubernetes.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.2" /><meta p [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Druid AWS RDS Module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/druid-aws-rds.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:versi [...]
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+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
   ~ Licensed to the Apache Software Foundation (ASF) under one
   ~ or more contributor license agreements.  See the NOTICE file
   ~ distributed with this work for additional information
@@ -21,11 +21,15 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>Apache Druid distribution is also available as <a href="https://www.docker.com/">Docker</a> image from <a href="https://hub.docker.com/r/apache/druid">Docker Hub</a> . For example, you can obtain release 0.16.0-incubating using the command below.</p>
-<pre><code class="hljs">$docker pull apache/druid:<span class="hljs-number">0.16</span><span class="hljs-number">.0</span>-incubating
+<p><a href="https://aws.amazon.com/rds/">AWS RDS</a> is a managed service to operate relation databases such as PostgreSQL, Mysql etc. These databases could be accessed using static db password mechanism or via <a href="https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/UsingWithRDS.IAMDBAuth.html">AWS IAM</a> temporary tokens. This module provides AWS RDS token <a href="/docs/0.21.0/operations/password-provider.html">password provider</a> implementation to be used with <a href="/doc [...]
+<pre><code class="hljs css language-json">{ <span class="hljs-attr">"type"</span>: <span class="hljs-string">"aws-rds-token"</span>, <span class="hljs-attr">"user"</span>: <span class="hljs-string">"USER"</span>, <span class="hljs-attr">"host"</span>: <span class="hljs-string">"HOST"</span>, <span class="hljs-attr">"port"</span>: PORT, <span class="hljs-attr">"region"</span>: <span class="hljs-string">"AWS_REGION"</span> }
 </code></pre>
-<p><a href="https://github.com/druid-io/druid-operator">druid-operator</a> can be used to manage a Druid cluster on <a href="https://kubernetes.io/">Kubernetes</a> .</p>
-</span></div></article></div><div class="docs-prevnext"></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div [...]
+<p>Before using this password provider, please make sure that you have connected all dots for db user to connect using token.
+See <a href="https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/UsingWithRDS.IAMDBAuth.html">AWS Guide</a>.</p>
+<p>To use this extension, make sure you <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> it in your config file along with other extensions e.g.</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.extensions.loadList</span>=[<span class="hljs-string">"druid-aws-rds-extensions"</span>, <span class="hljs-string">"postgresql-metadata-storage"</span>, ...]
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.21.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div [...]
                 document.addEventListener('keyup', function(e) {
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                     return;
@@ -42,6 +46,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/druid-basic-security.html b/docs/0.21.0/development/extensions-core/druid-basic-security.html
similarity index 62%
copy from docs/latest/development/extensions-core/druid-basic-security.html
copy to docs/0.21.0/development/extensions-core/druid-basic-security.html
index 20593e1..5ea2978 100644
--- a/docs/latest/development/extensions-core/druid-basic-security.html
+++ b/docs/0.21.0/development/extensions-core/druid-basic-security.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Basic Security · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/druid-basic-security.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:vers [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Basic Security · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/druid-basic-security.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:vers [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,17 +77,25 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>This Apache Druid extension adds:</p>
+<p>The Basic Security extension for Apache Druid adds:</p>
 <ul>
-<li>an Authenticator which supports <a href="https://en.wikipedia.org/wiki/Basic_access_authentication">HTTP Basic authentication</a> using the Druid metadata store or LDAP as its credentials store</li>
-<li>an Authorizer which implements basic role-based access control for Druid metadata store or LDAP users and groups</li>
+<li>an Authenticator which supports <a href="https://en.wikipedia.org/wiki/Basic_access_authentication">HTTP Basic authentication</a> using the Druid metadata store or LDAP as its credentials store.</li>
+<li>an Authorizer which implements basic role-based access control for Druid metadata store or LDAP users and groups.</li>
 </ul>
-<p>Make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>druid-basic-security</code> as an extension.</p>
-<p>Please see <a href="/docs/latest/design/auth.html">Authentication and Authorization</a> for more information on the extension interfaces being implemented.</p>
+<p>To load the extension, <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-basic-security</code> in the <code>druid.extensions.loadList</code> in your <code>common.runtime.properties</code>. For example:</p>
+<pre><code class="hljs"><span class="hljs-attr">druid.extensions.loadList</span>=[<span class="hljs-string">"postgresql-metadata-storage"</span>, <span class="hljs-string">"druid-hdfs-storage"</span>, <span class="hljs-string">"druid-basic-security"</span>]
+</code></pre>
+<p>See <a href="/docs/0.21.0/design/auth.html">Authentication and Authorization</a> for more information on the implemented extension interfaces.</p>
 <h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
-<p>The examples in the section will use &quot;MyBasicMetadataAuthenticator&quot;, &quot;MyBasicLDAPAuthenticator&quot;, &quot;MyBasicMetadataAuthorizer&quot;, and &quot;MyBasicLDAPAuthorizer&quot; as names for the Authenticators and Authorizer.</p>
+<p>The examples in the section use the following names for the Authenticators and Authorizers:</p>
+<ul>
+<li><code>MyBasicMetadataAuthenticator</code></li>
+<li><code>MyBasicLDAPAuthenticator</code></li>
+<li><code>MyBasicMetadataAuthorizer</code></li>
+<li><code>MyBasicLDAPAuthorizer</code>.</li>
+</ul>
 <p>These properties are not tied to specific Authenticator or Authorizer instances.</p>
-<p>These configuration properties should be added to the common runtime properties file.</p>
+<p>To set the value for the configuration properties, add them to the common runtime properties file.</p>
 <h3><a class="anchor" aria-hidden="true" id="properties"></a><a href="#properties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1 [...]
 <table>
 <thead>
@@ -111,43 +119,49 @@ druid<span class="hljs-selector-class">.auth</span><span class="hljs-selector-cl
 druid<span class="hljs-selector-class">.auth</span><span class="hljs-selector-class">.authenticator</span><span class="hljs-selector-class">.MyBasicMetadataAuthenticator</span>.authorizerName=MyBasicMetadataAuthorizer
 </code></pre>
 <p>To use the Basic authenticator, add an authenticator with type <code>basic</code> to the authenticatorChain.
-The authenticator needs to also define a credentialsValidator with type 'metadata' or 'ldap'.
-If credentialsValidator is not specified, type 'metadata' will be used as default.</p>
+The default credentials validator (<code>credentialsValidator</code>) is <code>metadata</code>. To use the LDAP validator, define a credentials validator with a type of 'ldap'.</p>
 <p>Configuration of the named authenticator is assigned through properties with the form:</p>
 <pre><code class="hljs">druid.auth.authenticator.<span class="hljs-tag">&lt;<span class="hljs-name">authenticatorName</span>&gt;</span>.<span class="hljs-tag">&lt;<span class="hljs-name">authenticatorProperty</span>&gt;</span>
 </code></pre>
-<p>The authenticator configuration examples in the rest of this document will use &quot;MyBasicMetadataAuthenticator&quot; or &quot;MyBasicLDAPAuthenticator&quot; as the name of the authenticators being configured.</p>
+<p>The remaining examples of authenticator configuration use either <code>MyBasicMetadataAuthenticator</code> or <code>MyBasicLDAPAuthenticator</code> as the authenticator name.</p>
 <h4><a class="anchor" aria-hidden="true" id="properties-for-druid-metadata-store-user-authentication"></a><a href="#properties-for-druid-metadata-store-user-authentication" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22- [...]
 <table>
 <thead>
 <tr><th>Property</th><th>Description</th><th>Default</th><th>required</th></tr>
 </thead>
 <tbody>
-<tr><td><code>druid.auth.authenticator.MyBasicMetadataAuthenticator.initialAdminPassword</code></td><td>Initial <a href="/docs/latest/operations/password-provider.html">Password Provider</a> for the automatically created default admin user. If no password is specified, the default admin user will not be created. If the default admin user already exists, setting this property will not affect its password.</td><td>null</td><td>No</td></tr>
-<tr><td><code>druid.auth.authenticator.MyBasicMetadataAuthenticator.initialInternalClientPassword</code></td><td>Initial <a href="/docs/latest/operations/password-provider.html">Password Provider</a> for the default internal system user, used for internal process communication. If no password is specified, the default internal system user will not be created. If the default internal system user already exists, setting this property will not affect its password.</td><td>null</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicMetadataAuthenticator.initialAdminPassword</code></td><td>Initial <a href="/docs/0.21.0/operations/password-provider.html">Password Provider</a> for the automatically created default admin user. If no password is specified, the default admin user will not be created. If the default admin user already exists, setting this property will not affect its password.</td><td>null</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicMetadataAuthenticator.initialInternalClientPassword</code></td><td>Initial <a href="/docs/0.21.0/operations/password-provider.html">Password Provider</a> for the default internal system user, used for internal process communication. If no password is specified, the default internal system user will not be created. If the default internal system user already exists, setting this property will not affect its password.</td><td>null</td><td>No</td></tr>
 <tr><td><code>druid.auth.authenticator.MyBasicMetadataAuthenticator.enableCacheNotifications</code></td><td>If true, the Coordinator will notify Druid processes whenever a configuration change to this Authenticator occurs, allowing them to immediately update their state without waiting for polling.</td><td>true</td><td>No</td></tr>
 <tr><td><code>druid.auth.authenticator.MyBasicMetadataAuthenticator.cacheNotificationTimeout</code></td><td>The timeout in milliseconds for the cache notifications.</td><td>5000</td><td>No</td></tr>
-<tr><td><code>druid.auth.authenticator.MyBasicMetadataAuthenticator.credentialIterations</code></td><td>Number of iterations to use for password hashing.</td><td>10000</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicMetadataAuthenticator.credentialIterations</code></td><td>Number of iterations to use for password hashing. See <a href="#credential-iterations-and-api-performance">Credential iterations and API performance</a></td><td>10000</td><td>No</td></tr>
 <tr><td><code>druid.auth.authenticator.MyBasicMetadataAuthenticator.credentialsValidator.type</code></td><td>The type of credentials store (metadata) to validate requests credentials.</td><td>metadata</td><td>No</td></tr>
 <tr><td><code>druid.auth.authenticator.MyBasicMetadataAuthenticator.skipOnFailure</code></td><td>If true and the request credential doesn't exists or isn't fully configured in the credentials store, the request will proceed to next Authenticator in the chain.</td><td>false</td><td>No</td></tr>
 <tr><td><code>druid.auth.authenticator.MyBasicMetadataAuthenticator.authorizerName</code></td><td>Authorizer that requests should be directed to</td><td>N/A</td><td>Yes</td></tr>
 </tbody>
 </table>
+<h5><a class="anchor" aria-hidden="true" id="credential-iterations-and-api-performance"></a><a href="#credential-iterations-and-api-performance" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1  [...]
+<p>The credential iterations setting affects API performance, including query times. The default setting of 10000 is intentionally high to prevent attackers from using brute force to guess passwords, but it adds latency.</p>
+<p>You can decrease the number of iterations to speed up API response times, but it potentially exposes your system to dictionary attacks. Therefore, only reduce the number of iterations if your environment fits one of the following conditions:</p>
+<ul>
+<li><strong>All</strong> passwords are long and random which make them as safe as a randomly-generated token.</li>
+<li>You have secured network access to Druid so that no attacker can execute a dictionary attack against it.</li>
+</ul>
 <h4><a class="anchor" aria-hidden="true" id="properties-for-ldap-user-authentication"></a><a href="#properties-for-ldap-user-authentication" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2  [...]
 <table>
 <thead>
 <tr><th>Property</th><th>Description</th><th>Default</th><th>required</th></tr>
 </thead>
 <tbody>
-<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.initialAdminPassword</code></td><td>Initial <a href="/docs/latest/operations/password-provider.html">Password Provider</a> for the automatically created default admin user. If no password is specified, the default admin user will not be created. If the default admin user already exists, setting this property will not affect its password.</td><td>null</td><td>No</td></tr>
-<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.initialInternalClientPassword</code></td><td>Initial <a href="/docs/latest/operations/password-provider.html">Password Provider</a> for the default internal system user, used for internal process communication. If no password is specified, the default internal system user will not be created. If the default internal system user already exists, setting this property will not affect its password.</td><td>null</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.initialAdminPassword</code></td><td>Initial <a href="/docs/0.21.0/operations/password-provider.html">Password Provider</a> for the automatically created default admin user. If no password is specified, the default admin user will not be created. If the default admin user already exists, setting this property will not affect its password.</td><td>null</td><td>No</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.initialInternalClientPassword</code></td><td>Initial <a href="/docs/0.21.0/operations/password-provider.html">Password Provider</a> for the default internal system user, used for internal process communication. If no password is specified, the default internal system user will not be created. If the default internal system user already exists, setting this property will not affect its password.</td><td>null</td><td>No</td></tr>
 <tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.enableCacheNotifications</code></td><td>If true, the Coordinator will notify Druid processes whenever a configuration change to this Authenticator occurs, allowing them to immediately update their state without waiting for polling.</td><td>true</td><td>No</td></tr>
 <tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.cacheNotificationTimeout</code></td><td>The timeout in milliseconds for the cache notifications.</td><td>5000</td><td>No</td></tr>
 <tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.credentialIterations</code></td><td>Number of iterations to use for password hashing.</td><td>10000</td><td>No</td></tr>
 <tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.credentialsValidator.type</code></td><td>The type of credentials store (ldap) to validate requests credentials.</td><td>metadata</td><td>No</td></tr>
 <tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.credentialsValidator.url</code></td><td>URL of the LDAP server.</td><td>null</td><td>Yes</td></tr>
 <tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.credentialsValidator.bindUser</code></td><td>LDAP bind user username.</td><td>null</td><td>Yes</td></tr>
-<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.credentialsValidator.bindPassword</code></td><td><a href="/docs/latest/operations/password-provider.html">Password Provider</a> LDAP bind user password.</td><td>null</td><td>Yes</td></tr>
+<tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.credentialsValidator.bindPassword</code></td><td><a href="/docs/0.21.0/operations/password-provider.html">Password Provider</a> LDAP bind user password.</td><td>null</td><td>Yes</td></tr>
 <tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.credentialsValidator.baseDn</code></td><td>The point from where the LDAP server will search for users.</td><td>null</td><td>Yes</td></tr>
 <tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.credentialsValidator.userSearch</code></td><td>The filter/expression to use for the search. For example, (&amp;(sAMAccountName=%s)(objectClass=user))</td><td>null</td><td>Yes</td></tr>
 <tr><td><code>druid.auth.authenticator.MyBasicLDAPAuthenticator.credentialsValidator.userAttribute</code></td><td>The attribute id identifying the attribute that will be returned as part of the search. For example, sAMAccountName.</td><td>null</td><td>Yes</td></tr>
@@ -172,7 +186,7 @@ If credentialsValidator is not specified, type 'metadata' will be used as defaul
 </thead>
 <tbody>
 <tr><td><code>druid.escalator.internalClientUsername</code></td><td>The escalator will use this username for requests made as the internal system user.</td><td>n/a</td><td>Yes</td></tr>
-<tr><td><code>druid.escalator.internalClientPassword</code></td><td>The escalator will use this <a href="/docs/latest/operations/password-provider.html">Password Provider</a> for requests made as the internal system user.</td><td>n/a</td><td>Yes</td></tr>
+<tr><td><code>druid.escalator.internalClientPassword</code></td><td>The escalator will use this <a href="/docs/0.21.0/operations/password-provider.html">Password Provider</a> for requests made as the internal system user.</td><td>n/a</td><td>Yes</td></tr>
 <tr><td><code>druid.escalator.authorizerName</code></td><td>Authorizer that requests should be directed to.</td><td>n/a</td><td>Yes</td></tr>
 </tbody>
 </table>
@@ -429,98 +443,11 @@ Set the permissions of {roleName}. This replaces the previous set of permissions
 ]
 </code></pre>
 <p>The &quot;name&quot; field for resources in the permission definitions are regexes used to match resource names during authorization checks.</p>
-<p>Please see <a href="#defining-permissions">Defining permissions</a> for more details.</p>
+<p>Please see <a href="/docs/0.21.0/operations/security-user-auth.html#defining-permissions">Defining permissions</a> for more details.</p>
 <h5><a class="anchor" aria-hidden="true" id="cache-load-status-1"></a><a href="#cache-load-status-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.2 [...]
 <p><code>GET(/druid-ext/basic-security/authorization/loadStatus)</code>
 Return the current load status of the local caches of the authorization Druid metadata store.</p>
-<h2><a class="anchor" aria-hidden="true" id="default-user-accounts"></a><a href="#default-user-accounts" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2 [...]
-<h3><a class="anchor" aria-hidden="true" id="authenticator"></a><a href="#authenticator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
-<p>If <code>druid.auth.authenticator.&lt;authenticator-name&gt;.initialAdminPassword</code> is set, a default admin user named &quot;admin&quot; will be created, with the specified initial password. If this configuration is omitted, the &quot;admin&quot; user will not be created.</p>
-<p>If <code>druid.auth.authenticator.&lt;authenticator-name&gt;.initialInternalClientPassword</code> is set, a default internal system user named &quot;druid_system&quot; will be created, with the specified initial password. If this configuration is omitted, the &quot;druid_system&quot; user will not be created.</p>
-<h3><a class="anchor" aria-hidden="true" id="authorizer"></a><a href="#authorizer" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1 [...]
-<p>Each Authorizer will always have a default &quot;admin&quot; and &quot;druid_system&quot; user with full privileges.</p>
-<h2><a class="anchor" aria-hidden="true" id="defining-permissions"></a><a href="#defining-permissions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1 [...]
-<p>There are two action types in Druid: READ and WRITE</p>
-<p>There are three resource types in Druid: DATASOURCE, CONFIG, and STATE.</p>
-<h3><a class="anchor" aria-hidden="true" id="datasource"></a><a href="#datasource" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1 [...]
-<p>Resource names for this type are datasource names. Specifying a datasource permission allows the administrator to grant users access to specific datasources.</p>
-<h3><a class="anchor" aria-hidden="true" id="config"></a><a href="#config" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2. [...]
-<p>There are two possible resource names for the &quot;CONFIG&quot; resource type, &quot;CONFIG&quot; and &quot;security&quot;. Granting a user access to CONFIG resources allows them to access the following endpoints.</p>
-<p>&quot;CONFIG&quot; resource name covers the following endpoints:</p>
-<table>
-<thead>
-<tr><th>Endpoint</th><th>Process Type</th></tr>
-</thead>
-<tbody>
-<tr><td><code>/druid/coordinator/v1/config</code></td><td>coordinator</td></tr>
-<tr><td><code>/druid/indexer/v1/worker</code></td><td>overlord</td></tr>
-<tr><td><code>/druid/indexer/v1/worker/history</code></td><td>overlord</td></tr>
-<tr><td><code>/druid/worker/v1/disable</code></td><td>middleManager</td></tr>
-<tr><td><code>/druid/worker/v1/enable</code></td><td>middleManager</td></tr>
-</tbody>
-</table>
-<p>&quot;security&quot; resource name covers the following endpoint:</p>
-<table>
-<thead>
-<tr><th>Endpoint</th><th>Process Type</th></tr>
-</thead>
-<tbody>
-<tr><td><code>/druid-ext/basic-security/authentication</code></td><td>coordinator</td></tr>
-<tr><td><code>/druid-ext/basic-security/authorization</code></td><td>coordinator</td></tr>
-</tbody>
-</table>
-<h3><a class="anchor" aria-hidden="true" id="state"></a><a href="#state" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09 [...]
-<p>There is only one possible resource name for the &quot;STATE&quot; config resource type, &quot;STATE&quot;. Granting a user access to STATE resources allows them to access the following endpoints.</p>
-<p>&quot;STATE&quot; resource name covers the following endpoints:</p>
-<table>
-<thead>
-<tr><th>Endpoint</th><th>Process Type</th></tr>
-</thead>
-<tbody>
-<tr><td><code>/druid/coordinator/v1</code></td><td>coordinator</td></tr>
-<tr><td><code>/druid/coordinator/v1/rules</code></td><td>coordinator</td></tr>
-<tr><td><code>/druid/coordinator/v1/rules/history</code></td><td>coordinator</td></tr>
-<tr><td><code>/druid/coordinator/v1/servers</code></td><td>coordinator</td></tr>
-<tr><td><code>/druid/coordinator/v1/tiers</code></td><td>coordinator</td></tr>
-<tr><td><code>/druid/broker/v1</code></td><td>broker</td></tr>
-<tr><td><code>/druid/v2/candidates</code></td><td>broker</td></tr>
-<tr><td><code>/druid/indexer/v1/leader</code></td><td>overlord</td></tr>
-<tr><td><code>/druid/indexer/v1/isLeader</code></td><td>overlord</td></tr>
-<tr><td><code>/druid/indexer/v1/action</code></td><td>overlord</td></tr>
-<tr><td><code>/druid/indexer/v1/workers</code></td><td>overlord</td></tr>
-<tr><td><code>/druid/indexer/v1/scaling</code></td><td>overlord</td></tr>
-<tr><td><code>/druid/worker/v1/enabled</code></td><td>middleManager</td></tr>
-<tr><td><code>/druid/worker/v1/tasks</code></td><td>middleManager</td></tr>
-<tr><td><code>/druid/worker/v1/task/{taskid}/shutdown</code></td><td>middleManager</td></tr>
-<tr><td><code>/druid/worker/v1/task/{taskid}/log</code></td><td>middleManager</td></tr>
-<tr><td><code>/druid/historical/v1</code></td><td>historical</td></tr>
-<tr><td><code>/druid-internal/v1/segments/</code></td><td>historical</td></tr>
-<tr><td><code>/druid-internal/v1/segments/</code></td><td>peon</td></tr>
-<tr><td><code>/druid-internal/v1/segments/</code></td><td>realtime</td></tr>
-<tr><td><code>/status</code></td><td>all process types</td></tr>
-</tbody>
-</table>
-<h3><a class="anchor" aria-hidden="true" id="http-methods"></a><a href="#http-methods" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83. [...]
-<p>For information on what HTTP methods are supported on a particular request endpoint, please refer to the <a href="/docs/latest/operations/api-reference.html">API documentation</a>.</p>
-<p>GET requires READ permission, while POST and DELETE require WRITE permission.</p>
-<h3><a class="anchor" aria-hidden="true" id="sql-permissions"></a><a href="#sql-permissions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5  [...]
-<p>Queries on Druid datasources require DATASOURCE READ permissions for the specified datasource.</p>
-<p>Queries on the <a href="../../querying/sql.html#information-schema">INFORMATION_SCHEMA tables</a> will
-return information about datasources that the caller has DATASOURCE READ access to. Other
-datasources will be omitted.</p>
-<p>Queries on the <a href="../../querying/sql.html#system-schema">system schema tables</a> require the following permissions:</p>
-<ul>
-<li><code>segments</code>: Segments will be filtered based on DATASOURCE READ permissions.</li>
-<li><code>servers</code>: The user requires STATE READ permissions.</li>
-<li><code>server_segments</code>: The user requires STATE READ permissions and segments will be filtered based on DATASOURCE READ permissions.</li>
-<li><code>tasks</code>: Tasks will be filtered based on DATASOURCE READ permissions.</li>
-</ul>
-<h2><a class="anchor" aria-hidden="true" id="configuration-propagation"></a><a href="#configuration-propagation" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c [...]
-<p>To prevent excessive load on the Coordinator, the Authenticator and Authorizer user/role Druid metadata store state is cached on each Druid process.</p>
-<p>Each process will periodically poll the Coordinator for the latest Druid metadata store state, controlled by the <code>druid.auth.basic.common.pollingPeriod</code> and <code>druid.auth.basic.common.maxRandomDelay</code> properties.</p>
-<p>When a configuration update occurs, the Coordinator can optionally notify each process with the updated Druid metadata store state. This behavior is controlled by the <code>enableCacheNotifications</code> and <code>cacheNotificationTimeout</code> properties on Authenticators and Authorizers.</p>
-<p>Note that because of the caching, changes made to the user/role Druid metadata store may not be immediately reflected at each Druid process.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-core/datasketches-tuple.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">DataSketches Tuple Sketch module</span></a><a class="docs-next button" href="/docs/latest/development/extensions-core/druid-kerberos.html"><span>Kerberos</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings">< [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/datasketches-tuple.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">DataSketches Tuple Sketch module</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/druid-kerberos.html"><span>Kerberos</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings">< [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -537,6 +464,6 @@ datasources will be omitted.</p>
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/druid-kerberos.html b/docs/0.21.0/development/extensions-core/druid-kerberos.html
similarity index 63%
copy from docs/latest/development/extensions-core/druid-kerberos.html
copy to docs/0.21.0/development/extensions-core/druid-kerberos.html
index 16779ab..790705b 100644
--- a/docs/latest/development/extensions-core/druid-kerberos.html
+++ b/docs/0.21.0/development/extensions-core/druid-kerberos.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Kerberos · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/druid-kerberos.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Kerberos · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/druid-kerberos.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -79,7 +79,7 @@
   -->
 <p>Apache Druid Extension to enable Authentication for Druid Processes using Kerberos.
 This extension adds an Authenticator which is used to protect HTTP Endpoints using the simple and protected GSSAPI negotiation mechanism <a href="https://en.wikipedia.org/wiki/SPNEGO">SPNEGO</a>.
-Make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>druid-kerberos</code> as an extension.</p>
+Make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-kerberos</code> as an extension.</p>
 <h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
 <h3><a class="anchor" aria-hidden="true" id="creating-an-authenticator"></a><a href="#creating-an-authenticator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c [...]
 <pre><code class="hljs"><span class="hljs-attr">druid.auth.authenticatorChain</span>=[<span class="hljs-string">"MyKerberosAuthenticator"</span>]
@@ -107,7 +107,7 @@ Make sure to <a href="/docs/latest/development/extensions.html#loading-extension
 <p>As a note, it is required that the SPNego principal in use by the druid processes must start with HTTP (This specified by <a href="https://tools.ietf.org/html/rfc4559">RFC-4559</a>) and must be of the form &quot;HTTP/_HOST@REALM&quot;.
 The special string _HOST will be replaced automatically with the value of config <code>druid.host</code></p>
 <h3><a class="anchor" aria-hidden="true" id="druidauthauthenticatorkerberosexcludedpaths"></a><a href="#druidauthauthenticatorkerberosexcludedpaths" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h [...]
-<p>In older releases, the Kerberos authenticator had an <code>excludedPaths</code> property that allowed the user to specify a list of paths where authentication checks should be skipped. This property has been removed from the Kerberos authenticator because the path exclusion functionality is now handled across all authenticators/authorizers by setting <code>druid.auth.unsecuredPaths</code>, as described in the <a href="/docs/latest/design/auth.html">main auth documentation</a>.</p>
+<p>In older releases, the Kerberos authenticator had an <code>excludedPaths</code> property that allowed the user to specify a list of paths where authentication checks should be skipped. This property has been removed from the Kerberos authenticator because the path exclusion functionality is now handled across all authenticators/authorizers by setting <code>druid.auth.unsecuredPaths</code>, as described in the <a href="/docs/0.21.0/design/auth.html">main auth documentation</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="auth-to-local-syntax"></a><a href="#auth-to-local-syntax" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1 [...]
 <p><code>druid.auth.authenticator.kerberos.authToLocal</code> allows you to set a general rules for mapping principal names to local user names.
 The syntax for mapping rules is <code>RULE:\[n:string](regexp)s/pattern/replacement/g</code>. The integer n indicates how many components the target principal should have. If this matches, then a string will be formed from string, substituting the realm of the principal for $0 and the nth component of the principal for $n. e.g. if the principal was druid/admin then <code>\[2:$2$1suffix]</code> would result in the string <code>admindruidsuffix</code>.
@@ -166,7 +166,7 @@ In such cases, max request header size that druid can handle can be increased by
 </ol>
 <h2><a class="anchor" aria-hidden="true" id="sending-queries-programmatically"></a><a href="#sending-queries-programmatically" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13. [...]
 <p>Many HTTP client libraries, such as Apache Commons <a href="https://hc.apache.org/">HttpComponents</a>, already have support for performing SPNEGO authentication. You can use any of the available HTTP client library to communicate with druid cluster.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-core/druid-basic-security.html"><span class="arrow-prev">← </span><span>Basic Security</span></a><a class="docs-next button" href="/docs/latest/development/extensions-core/druid-lookups.html"><span>Cached Lookup Module</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#configuration">Configur [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/druid-basic-security.html"><span class="arrow-prev">← </span><span>Basic Security</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/druid-lookups.html"><span>Cached Lookup Module</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#configuration">Configur [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -183,6 +183,6 @@ In such cases, max request header size that druid can handle can be increased by
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/development/extensions-core/druid-kubernetes.html b/docs/0.21.0/development/extensions-core/druid-kubernetes.html
new file mode 100644
index 0000000..11470dc
--- /dev/null
+++ b/docs/0.21.0/development/extensions-core/druid-kubernetes.html
@@ -0,0 +1,100 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Kubernetes · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/druid-kubernetes.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" con [...]
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>Consider this an <a href="/docs/0.21.0/development/experimental.html">EXPERIMENTAL</a> feature mostly because it has not been tested yet on a wide variety of long running Druid clusters.</p>
+<p>Apache Druid Extension to enable using Kubernetes API Server for node discovery and leader election. This extension allows Druid cluster deployment on Kubernetes without Zookeeper. It allows running multiple Druid clusters within same Kubernetes Cluster, See <code>clusterIdentifier</code> config below.</p>
+<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
+<p>To use this extension please make sure to  <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-kubernetes-extensions</code> as an extension.</p>
+<p>This extension works together with HTTP based segment and task management in Druid. Consequently, following configurations must be set on all Druid nodes.</p>
+<p><code>druid.zk.service.enabled=false</code>
+<code>druid.serverview.type=http</code>
+<code>druid.coordinator.loadqueuepeon.type=http</code>
+<code>druid.indexer.runner.type=httpRemote</code>
+<code>druid.discovery.type=k8s</code></p>
+<p>For Node Discovery, Each Druid process running inside a pod &quot;announces&quot; itself by adding few &quot;labels&quot; and &quot;annotations&quot; in the pod spec. Druid process needs to be aware of pod name and namespace which it reads from environment variables <code>POD_NAME</code> and <code>POD_NAMESPACE</code>. These variable names can be changed, see configuration below. But in the end, each pod needs to have self pod name and namespace added as environment variables.</p>
+<p>Additionally, this extension has following configuration.</p>
+<h3><a class="anchor" aria-hidden="true" id="properties"></a><a href="#properties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1 [...]
+<table>
+<thead>
+<tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th><th>required</th></tr>
+</thead>
+<tbody>
+<tr><td><code>druid.discovery.k8s.clusterIdentifier</code></td><td><code>string that matches [a-z0-9][a-z0-9-]*[a-z0-9]</code></td><td>Unique identifier for this Druid cluster in Kubernetes e.g. us-west-prod-druid.</td><td>None</td><td>Yes</td></tr>
+<tr><td><code>druid.discovery.k8s.podNameEnvKey</code></td><td><code>Pod Env Variable</code></td><td>Pod Env variable whose value is that pod's name.</td><td>POD_NAME</td><td>No</td></tr>
+<tr><td><code>druid.discovery.k8s.podNamespaceEnvKey</code></td><td><code>Pod Env Variable</code></td><td>Pod Env variable whose value is that pod's kubernetes namespace.</td><td>POD_NAMESPACE</td><td>No</td></tr>
+<tr><td><code>druid.discovery.k8s.leaseDuration</code></td><td><code>Duration</code></td><td>Lease duration used by Leader Election algorithm. Candidates wait for this time before taking over previous Leader.</td><td>PT60S</td><td>No</td></tr>
+<tr><td><code>druid.discovery.k8s.renewDeadline</code></td><td><code>Duration</code></td><td>Lease renewal period used by Leader.</td><td>PT17S</td><td>No</td></tr>
+<tr><td><code>druid.discovery.k8s.retryPeriod</code></td><td><code>Duration</code></td><td>Retry wait used by Leader Election algorithm on failed operations.</td><td>PT5S</td><td>No</td></tr>
+</tbody>
+</table>
+<h3><a class="anchor" aria-hidden="true" id="gotchas"></a><a href="#gotchas" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1- [...]
+<ul>
+<li>Label/Annotation path in each pod spec MUST EXIST, which is easily satisfied if there is at least one label/annotation in the pod spec already. This limitation may be removed in future.</li>
+<li>All Druid Pods belonging to one Druid cluster must be inside same kubernetes namespace.</li>
+<li>All Druid Pods need permissions to be able to add labels to self-pod, List and Watch other Pods, create and read ConfigMap for leader election. Assuming, &quot;default&quot; service account is used by Druid pods, you might need to add following or something similar Kubernetes Role and Role Binding.</li>
+</ul>
+<pre><code class="hljs"><span class="hljs-attr">apiVersion:</span> <span class="hljs-string">rbac.authorization.k8s.io/v1</span>
+<span class="hljs-attr">kind:</span> <span class="hljs-string">Role</span>
+<span class="hljs-attr">metadata:</span>
+  <span class="hljs-attr">name:</span> <span class="hljs-string">druid-cluster</span>
+<span class="hljs-attr">rules:</span>
+<span class="hljs-bullet">-</span> <span class="hljs-attr">apiGroups:</span>
+  <span class="hljs-bullet">-</span> <span class="hljs-string">""</span>
+  <span class="hljs-attr">resources:</span>
+  <span class="hljs-bullet">-</span> <span class="hljs-string">pods</span>
+  <span class="hljs-bullet">-</span> <span class="hljs-string">configmaps</span>
+  <span class="hljs-attr">verbs:</span>
+  <span class="hljs-bullet">-</span> <span class="hljs-string">'*'</span>
+<span class="hljs-meta">---</span>
+<span class="hljs-attr">kind:</span> <span class="hljs-string">RoleBinding</span>
+<span class="hljs-attr">apiVersion:</span> <span class="hljs-string">rbac.authorization.k8s.io/v1</span>
+<span class="hljs-attr">metadata:</span>
+  <span class="hljs-attr">name:</span> <span class="hljs-string">druid-cluster</span>
+<span class="hljs-attr">subjects:</span>
+<span class="hljs-bullet">-</span> <span class="hljs-attr">kind:</span> <span class="hljs-string">ServiceAccount</span>
+  <span class="hljs-attr">name:</span> <span class="hljs-string">default</span>
+<span class="hljs-attr">roleRef:</span>
+  <span class="hljs-attr">kind:</span> <span class="hljs-string">Role</span>
+  <span class="hljs-attr">name:</span> <span class="hljs-string">druid-cluster</span>
+  <span class="hljs-attr">apiGroup:</span> <span class="hljs-string">rbac.authorization.k8s.io</span>
+</code></pre>
+</span></div></article></div><div class="docs-prevnext"></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#configuration">Configuration</a><ul class="toc-headings"><li><a href="#properties">Properties</a></li><li><a href="#gotchas">Gotchas</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href=" [...]
+                document.addEventListener('keyup', function(e) {
+                  if (e.target !== document.body) {
+                    return;
+                  }
+                  // keyCode for '/' (slash)
+                  if (e.keyCode === 191) {
+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
+                apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
+                indexName: 'apache_druid',
+                inputSelector: '#search_input_react',
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
+              });
+            </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/druid-lookups.html b/docs/0.21.0/development/extensions-core/druid-lookups.html
similarity index 65%
copy from docs/latest/development/extensions-core/druid-lookups.html
copy to docs/0.21.0/development/extensions-core/druid-lookups.html
index 3f13edc..5a3b46d 100644
--- a/docs/latest/development/extensions-core/druid-lookups.html
+++ b/docs/0.21.0/development/extensions-core/druid-lookups.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Cached Lookup Module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/druid-lookups.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:versi [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Cached Lookup Module · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/druid-lookups.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:versi [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -85,7 +85,7 @@
 The main goal of this cache is to speed up the access to a high latency lookup sources and to provide a caching isolation for every lookup source.
 Thus user can define various caching strategies or and implementation per lookup, even if the source is the same.
 This module can be used side to side with other lookup module like the global cached lookup module.</p>
-<p>To use this extension please make sure to  <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>druid-lookups-cached-single</code> as an extension.</p>
+<p>To use this extension please make sure to  <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-lookups-cached-single</code> as an extension.</p>
 <blockquote>
 <p>If using JDBC, you will need to add your database's client JAR files to the extension's directory.
 For Postgres, the connector JAR is already included.
@@ -201,14 +201,14 @@ Same for Loading cache, developer can implement a new type of loading cache by i
 <tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th><th>default</th></tr>
 </thead>
 <tbody>
-<tr><td><code>connectorConfig</code></td><td>JSON object</td><td>Specifies the database connection details. You can set <code>connectURI</code>, <code>user</code> and <code>password</code>. You can selectively allow JDBC properties in <code>connectURI</code>. See <a href="/docs/latest/configuration/index.html#jdbc-connections-to-external-databases">JDBC connections security config</a> for more details.</td><td>yes</td><td></td></tr>
+<tr><td><code>connectorConfig</code></td><td>JSON object</td><td>Specifies the database connection details. You can set <code>connectURI</code>, <code>user</code> and <code>password</code>. You can selectively allow JDBC properties in <code>connectURI</code>. See <a href="/docs/0.21.0/configuration/index.html#jdbc-connections-to-external-databases">JDBC connections security config</a> for more details.</td><td>yes</td><td></td></tr>
 <tr><td><code>table</code></td><td>string</td><td>The table name to read from.</td><td>yes</td><td></td></tr>
 <tr><td><code>keyColumn</code></td><td>string</td><td>The column name that contains the lookup key.</td><td>yes</td><td></td></tr>
 <tr><td><code>valueColumn</code></td><td>string</td><td>The column name that contains the lookup value.</td><td>yes</td><td></td></tr>
 <tr><td><code>streamingFetchSize</code></td><td>int</td><td>Fetch size used in JDBC connections.</td><td>no</td><td>1000</td></tr>
 </tbody>
 </table>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-core/druid-kerberos.html"><span class="arrow-prev">← </span><span>Kerberos</span></a><a class="docs-next button" href="/docs/latest/development/extensions-core/druid-ranger-security.html"><span>Apache Ranger Security</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#description">Description< [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/druid-kerberos.html"><span class="arrow-prev">← </span><span>Kerberos</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/druid-ranger-security.html"><span>Apache Ranger Security</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#description">Description< [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -225,6 +225,6 @@ Same for Loading cache, developer can implement a new type of loading cache by i
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/druid-pac4j.html b/docs/0.21.0/development/extensions-core/druid-pac4j.html
similarity index 50%
copy from docs/latest/development/extensions-core/druid-pac4j.html
copy to docs/0.21.0/development/extensions-core/druid-pac4j.html
index b76c19b..de0a8d5 100644
--- a/docs/latest/development/extensions-core/druid-pac4j.html
+++ b/docs/0.21.0/development/extensions-core/druid-pac4j.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Druid pac4j based Security extension · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/druid-pac4j.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="d [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Druid pac4j based Security extension · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/druid-pac4j.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="d [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -79,7 +79,7 @@
   -->
 <p>Apache Druid Extension to enable <a href="https://openid.net/connect/">OpenID Connect</a> based Authentication for Druid Processes using <a href="https://github.com/pac4j/pac4j">pac4j</a> as the underlying client library.
 This can be used  with any authentication server that supports same e.g. <a href="https://developer.okta.com/">Okta</a>.
-This extension should only be used at the router node to enable a group of users in existing authentication server to interact with Druid cluster, using the <a href="../../operations/druid-console.html">Web Console</a>. This extension does not support JDBC client authentication.</p>
+This extension should only be used at the router node to enable a group of users in existing authentication server to interact with Druid cluster, using the <a href="/docs/0.21.0/operations/druid-console.html">Web Console</a>. This extension does not support JDBC client authentication.</p>
 <h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
 <h3><a class="anchor" aria-hidden="true" id="creating-an-authenticator"></a><a href="#creating-an-authenticator" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c [...]
 <pre><code class="hljs"><span class="hljs-attr">druid.auth.authenticatorChain</span>=[<span class="hljs-string">"pac4j"</span>]
@@ -91,15 +91,15 @@ This extension should only be used at the router node to enable a group of users
 <tr><th>Property</th><th>Description</th><th>Default</th><th>required</th></tr>
 </thead>
 <tbody>
-<tr><td><code>druid.auth.pac4j.cookiePassphrase</code></td><td>passphrase for encrypting the cookies used to manage authentication session with browser. It can be provided as plaintext string or The <a href="/docs/latest/operations/password-provider.html">Password Provider</a>.</td><td>none</td><td>Yes</td></tr>
+<tr><td><code>druid.auth.pac4j.cookiePassphrase</code></td><td>passphrase for encrypting the cookies used to manage authentication session with browser. It can be provided as plaintext string or The <a href="/docs/0.21.0/operations/password-provider.html">Password Provider</a>.</td><td>none</td><td>Yes</td></tr>
 <tr><td><code>druid.auth.pac4j.readTimeout</code></td><td>Socket connect and read timeout duration used when communicating with authentication server</td><td>PT5S</td><td>No</td></tr>
-<tr><td><code>druid.auth.pac4j.enableCustomSslContext</code></td><td>Whether to use custom SSLContext setup via <a href="/docs/latest/development/extensions-core/simple-client-sslcontext.html">simple-client-sslcontext</a> extension which must be added to extensions list when this property is set to true.</td><td>false</td><td>No</td></tr>
+<tr><td><code>druid.auth.pac4j.enableCustomSslContext</code></td><td>Whether to use custom SSLContext setup via <a href="/docs/0.21.0/development/extensions-core/simple-client-sslcontext.html">simple-client-sslcontext</a> extension which must be added to extensions list when this property is set to true.</td><td>false</td><td>No</td></tr>
 <tr><td><code>druid.auth.pac4j.oidc.clientID</code></td><td>OAuth Client Application id.</td><td>none</td><td>Yes</td></tr>
-<tr><td><code>druid.auth.pac4j.oidc.clientSecret</code></td><td>OAuth Client Application secret. It can be provided as plaintext string or The <a href="/docs/latest/operations/password-provider.html">Password Provider</a>.</td><td>none</td><td>Yes</td></tr>
+<tr><td><code>druid.auth.pac4j.oidc.clientSecret</code></td><td>OAuth Client Application secret. It can be provided as plaintext string or The <a href="/docs/0.21.0/operations/password-provider.html">Password Provider</a>.</td><td>none</td><td>Yes</td></tr>
 <tr><td><code>druid.auth.pac4j.oidc.discoveryURI</code></td><td>discovery URI for fetching OP metadata <a href="http://openid.net/specs/openid-connect-discovery-1_0.html">see this</a>.</td><td>none</td><td>Yes</td></tr>
 </tbody>
 </table>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-core/orc.html"><span class="arrow-prev">← </span><span>ORC Extension</span></a><a class="docs-next button" href="/docs/latest/development/extensions-core/parquet.html"><span>Apache Parquet Extension</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#configuration">Configuration</a><ul class=" [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/orc.html"><span class="arrow-prev">← </span><span>ORC Extension</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/parquet.html"><span>Apache Parquet Extension</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#configuration">Configuration</a><ul class=" [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -116,6 +116,6 @@ This extension should only be used at the router node to enable a group of users
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/druid-ranger-security.html b/docs/0.21.0/development/extensions-core/druid-ranger-security.html
similarity index 61%
copy from docs/latest/development/extensions-core/druid-ranger-security.html
copy to docs/0.21.0/development/extensions-core/druid-ranger-security.html
index a73a270..2caefb4 100644
--- a/docs/latest/development/extensions-core/druid-ranger-security.html
+++ b/docs/0.21.0/development/extensions-core/druid-ranger-security.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Apache Ranger Security · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/druid-ranger-security.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docse [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Apache Ranger Security · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/druid-ranger-security.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docse [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,8 +77,8 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>This Apache Druid extension adds an Authorizer which implements access control for Druid, backed by <a href="https://ranger.apache.org/">Apache Ranger</a>. Please see <a href="/docs/latest/design/auth.html">Authentication and Authorization</a> for more information on the basic facilities this extension provides.</p>
-<p>Make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>druid-ranger-security</code> as an extension.</p>
+<p>This Apache Druid extension adds an Authorizer which implements access control for Druid, backed by <a href="https://ranger.apache.org/">Apache Ranger</a>. Please see <a href="/docs/0.21.0/design/auth.html">Authentication and Authorization</a> for more information on the basic facilities this extension provides.</p>
+<p>Make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-ranger-security</code> as an extension.</p>
 <blockquote>
 <p>The latest release of Apache Ranger is at the time of writing version 2.0. This version has a dependency on <code>log4j 1.2.17</code> which has a vulnerability if you configure it to use a <code>SocketServer</code> (CVE-2019-17571). Next to that, it also includes Kafka 2.0.0 which has 2 known vulnerabilities (CVE-2019-12399, CVE-2018-17196). Kafka can be used by the audit component in Ranger, but is not required.</p>
 </blockquote>
@@ -141,12 +141,12 @@
 </blockquote>
 <h2><a class="anchor" aria-hidden="true" id="usage"></a><a href="#usage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09 [...]
 <h3><a class="anchor" aria-hidden="true" id="http-methods"></a><a href="#http-methods" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83. [...]
-<p>For information on what HTTP methods are supported for a particular request endpoint, please refer to the <a href="/docs/latest/operations/api-reference.html">API documentation</a>.</p>
+<p>For information on what HTTP methods are supported for a particular request endpoint, please refer to the <a href="/docs/0.21.0/operations/api-reference.html">API documentation</a>.</p>
 <p>GET requires READ permission, while POST and DELETE require WRITE permission.</p>
 <h3><a class="anchor" aria-hidden="true" id="sql-permissions"></a><a href="#sql-permissions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5  [...]
 <p>Queries on Druid datasources require DATASOURCE READ permissions for the specified datasource.</p>
-<p>Queries on the <a href="../../querying/sql.html#information-schema">INFORMATION_SCHEMA tables</a> will return information about datasources that the caller has DATASOURCE READ access to. Other datasources will be omitted.</p>
-<p>Queries on the <a href="../../querying/sql.html#system-schema">system schema tables</a> require the following permissions:</p>
+<p>Queries on the <a href="/docs/0.21.0/querying/sql.html#information-schema">INFORMATION_SCHEMA tables</a> will return information about datasources that the caller has DATASOURCE READ access to. Other datasources will be omitted.</p>
+<p>Queries on the <a href="/docs/0.21.0/querying/sql.html#system-schema">system schema tables</a> require the following permissions:</p>
 <ul>
 <li><code>segments</code>: Segments will be filtered based on DATASOURCE READ permissions.</li>
 <li><code>servers</code>: The user requires STATE READ permissions.</li>
@@ -160,7 +160,7 @@
   <span class="hljs-tag">&lt;<span class="hljs-name">Appender-ref</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"Console"</span>/&gt;</span>
 <span class="hljs-tag">&lt;/<span class="hljs-name">Logger</span>&gt;</span>
 </code></pre>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-core/druid-lookups.html"><span class="arrow-prev">← </span><span>Cached Lookup Module</span></a><a class="docs-next button" href="/docs/latest/development/extensions-core/google.html"><span>Google Cloud Storage</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#configuration">Configuration</a [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/druid-lookups.html"><span class="arrow-prev">← </span><span>Cached Lookup Module</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/google.html"><span>Google Cloud Storage</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#configuration">Configuration</a [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -177,6 +177,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/examples.html b/docs/0.21.0/development/extensions-core/examples.html
similarity index 95%
copy from docs/latest/development/extensions-core/examples.html
copy to docs/0.21.0/development/extensions-core/examples.html
index 9361b32..84c1572 100644
--- a/docs/latest/development/extensions-core/examples.html
+++ b/docs/0.21.0/development/extensions-core/examples.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Extension Examples · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/examples.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" con [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Extension Examples · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/examples.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" con [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
   ~ Licensed to the Apache Software Foundation (ASF) under one
   ~ or more contributor license agreements.  See the NOTICE file
   ~ distributed with this work for additional information
@@ -22,7 +22,7 @@
   ~ under the License.
   -->
 <p>This extension was removed in Apache Druid 0.16.0. In prior versions, the extension provided obsolete facilities to ingest data from the Twitter 'Spritzer' data stream as well as the Wikipedia changes IRC channel.</p>
-</span></div></article></div><div class="docs-prevnext"></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div [...]
+</span></div></article></div><div class="docs-prevnext"></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.21.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -39,6 +39,6 @@
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/google.html b/docs/0.21.0/development/extensions-core/google.html
similarity index 52%
copy from docs/latest/development/extensions-core/google.html
copy to docs/0.21.0/development/extensions-core/google.html
index 70c4b57..0bcba1a 100644
--- a/docs/latest/development/extensions-core/google.html
+++ b/docs/0.21.0/development/extensions-core/google.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Google Cloud Storage · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/google.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" con [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Google Cloud Storage · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/google.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" con [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -83,16 +83,16 @@
 <li><a href="#reading-data-from-google-cloud-storage">Ingest data</a> from files stored in Google Cloud Storage.</li>
 <li>Write segments to <a href="#deep-storage">deep storage</a> in GCS.</li>
 </ul>
-<p>To use this Apache Druid extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>druid-google-extensions</code> extension.</p>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-google-extensions</code> extension.</p>
 <h3><a class="anchor" aria-hidden="true" id="required-configuration"></a><a href="#required-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0 [...]
 <p>To configure connectivity to google cloud, run druid processes with <code>GOOGLE_APPLICATION_CREDENTIALS=/path/to/service_account_keyfile</code> in the environment.</p>
 <h3><a class="anchor" aria-hidden="true" id="reading-data-from-google-cloud-storage"></a><a href="#reading-data-from-google-cloud-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1. [...]
-<p>The <a href="/docs/latest/ingestion/native-batch.html#google-cloud-storage-input-source">Google Cloud Storage input source</a> is supported by the <a href="/docs/latest/ingestion/native-batch.html#parallel-task">Parallel task</a>
-to read objects directly from Google Cloud Storage. If you use the <a href="/docs/latest/ingestion/hadoop.html">Hadoop task</a>,
-you can read data from Google Cloud Storage by specifying the paths in your <a href="/docs/latest/ingestion/hadoop.html#inputspec"><code>inputSpec</code></a>.</p>
-<p>Objects can also be read directly from Google Cloud Storage via the <a href="/docs/latest/ingestion/native-batch.html#staticgoogleblobstorefirehose">StaticGoogleBlobStoreFirehose</a></p>
+<p>The <a href="/docs/0.21.0/ingestion/native-batch.html#google-cloud-storage-input-source">Google Cloud Storage input source</a> is supported by the <a href="/docs/0.21.0/ingestion/native-batch.html#parallel-task">Parallel task</a>
+to read objects directly from Google Cloud Storage. If you use the <a href="/docs/0.21.0/ingestion/hadoop.html">Hadoop task</a>,
+you can read data from Google Cloud Storage by specifying the paths in your <a href="/docs/0.21.0/ingestion/hadoop.html#inputspec"><code>inputSpec</code></a>.</p>
+<p>Objects can also be read directly from Google Cloud Storage via the <a href="/docs/0.21.0/ingestion/native-batch.html#staticgoogleblobstorefirehose">StaticGoogleBlobStoreFirehose</a></p>
 <h3><a class="anchor" aria-hidden="true" id="deep-storage"></a><a href="#deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83. [...]
-<p>Deep storage can be written to Google Cloud Storage either via this extension or the <a href="/docs/latest/development/extensions-core/hdfs.html">druid-hdfs-storage extension</a>.</p>
+<p>Deep storage can be written to Google Cloud Storage either via this extension or the <a href="/docs/0.21.0/development/extensions-core/hdfs.html">druid-hdfs-storage extension</a>.</p>
 <h4><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
 <p>To configure connectivity to google cloud, run druid processes with <code>GOOGLE_APPLICATION_CREDENTIALS=/path/to/service_account_keyfile</code> in the environment.</p>
 <table>
@@ -106,7 +106,7 @@ you can read data from Google Cloud Storage by specifying the paths in your <a h
 <tr><td><code>druid.google.maxListingLength</code></td><td>maximum number of input files matching a given prefix to retrieve at a time</td><td></td><td>1024</td></tr>
 </tbody>
 </table>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-core/druid-ranger-security.html"><span class="arrow-prev">← </span><span>Apache Ranger Security</span></a><a class="docs-next button" href="/docs/latest/development/extensions-core/hdfs.html"><span>HDFS</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#google-cloud-storage-extension">Google  [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/druid-ranger-security.html"><span class="arrow-prev">← </span><span>Apache Ranger Security</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/hdfs.html"><span>HDFS</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#google-cloud-storage-extension">Google  [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -123,6 +123,6 @@ you can read data from Google Cloud Storage by specifying the paths in your <a h
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/hdfs.html b/docs/0.21.0/development/extensions-core/hdfs.html
similarity index 62%
copy from docs/latest/development/extensions-core/hdfs.html
copy to docs/0.21.0/development/extensions-core/hdfs.html
index 45881c2..cf800a0 100644
--- a/docs/latest/development/extensions-core/hdfs.html
+++ b/docs/0.21.0/development/extensions-core/hdfs.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>HDFS · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/hdfs.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20.2" /><m [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>HDFS · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/hdfs.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21.0" /><m [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,7 +77,7 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>To use this Apache Druid extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>druid-hdfs-storage</code> as an extension and run druid processes with <code>GOOGLE_APPLICATION_CREDENTIALS=/path/to/service_account_keyfile</code> in the environment.</p>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-hdfs-storage</code> as an extension and run druid processes with <code>GOOGLE_APPLICATION_CREDENTIALS=/path/to/service_account_keyfile</code> in the environment.</p>
 <h2><a class="anchor" aria-hidden="true" id="deep-storage"></a><a href="#deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83. [...]
 <h3><a class="anchor" aria-hidden="true" id="configuration-for-hdfs"></a><a href="#configuration-for-hdfs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0 [...]
 <table>
@@ -108,13 +108,13 @@ If you want to eagerly authenticate against a secured hadoop/hdfs cluster you mu
 <tr><td><code>druid.storage.storageDirectory</code></td><td><a href="s3a://bucket/example/directory">s3a://bucket/example/directory</a> or <a href="s3n://bucket/example/directory">s3n://bucket/example/directory</a></td><td>Path to the deep storage</td><td>Must be set.</td></tr>
 </tbody>
 </table>
-<p>You also need to include the <a href="https://hadoop.apache.org/docs/current/hadoop-aws/tools/hadoop-aws/index.html">Hadoop AWS module</a>, especially the <code>hadoop-aws.jar</code> in the Druid classpath.
+<p>You also need to include the <a href="https://hadoop.apache.org/docs/current/hadoop-aws/tools/hadoop-aws/">Hadoop AWS module</a>, especially the <code>hadoop-aws.jar</code> in the Druid classpath.
 Run the below command to install the <code>hadoop-aws.jar</code> file under <code>${DRUID_HOME}/extensions/druid-hdfs-storage</code> in all nodes.</p>
 <pre><code class="hljs css language-bash">java -classpath <span class="hljs-string">"<span class="hljs-variable">${DRUID_HOME}</span>lib/*"</span> org.apache.druid.cli.Main tools pull-deps -h <span class="hljs-string">"org.apache.hadoop:hadoop-aws:<span class="hljs-variable">${HADOOP_VERSION}</span>"</span>;
 cp <span class="hljs-variable">${DRUID_HOME}</span>/hadoop-dependencies/hadoop-aws/<span class="hljs-variable">${HADOOP_VERSION}</span>/hadoop-aws-<span class="hljs-variable">${HADOOP_VERSION}</span>.jar <span class="hljs-variable">${DRUID_HOME}</span>/extensions/druid-hdfs-storage/
 </code></pre>
 <p>Finally, you need to add the below properties in the <code>core-site.xml</code>.
-For more configurations, see the <a href="https://hadoop.apache.org/docs/current/hadoop-aws/tools/hadoop-aws/index.html">Hadoop AWS module</a>.</p>
+For more configurations, see the <a href="https://hadoop.apache.org/docs/current/hadoop-aws/tools/hadoop-aws/">Hadoop AWS module</a>.</p>
 <pre><code class="hljs css language-xml"><span class="hljs-tag">&lt;<span class="hljs-name">property</span>&gt;</span>
   <span class="hljs-tag">&lt;<span class="hljs-name">name</span>&gt;</span>fs.s3a.impl<span class="hljs-tag">&lt;/<span class="hljs-name">name</span>&gt;</span>
   <span class="hljs-tag">&lt;<span class="hljs-name">value</span>&gt;</span>org.apache.hadoop.fs.s3a.S3AFileSystem<span class="hljs-tag">&lt;/<span class="hljs-name">value</span>&gt;</span>
@@ -159,7 +159,7 @@ and authentication properties needed for GCS. You may want to copy the below
 example properties. Please follow the instructions at
 <a href="https://github.com/GoogleCloudPlatform/bigdata-interop/blob/master/gcs/INSTALL.md">https://github.com/GoogleCloudPlatform/bigdata-interop/blob/master/gcs/INSTALL.md</a>
 for more details.
-For more configurations, <a href="https://github.com/GoogleCloudPlatform/bigdata-interop/blob/master/gcs/conf/gcs-core-default.xml">GCS core default</a>
+For more configurations, <a href="https://github.com/GoogleCloudDataproc/hadoop-connectors/blob/v2.0.0/gcs/conf/gcs-core-default.xml">GCS core default</a>
 and <a href="https://github.com/GoogleCloudPlatform/bdutil/blob/master/conf/hadoop2/gcs-core-template.xml">GCS core template</a>.</p>
 <pre><code class="hljs css language-xml"><span class="hljs-tag">&lt;<span class="hljs-name">property</span>&gt;</span>
   <span class="hljs-tag">&lt;<span class="hljs-name">name</span>&gt;</span>fs.gs.impl<span class="hljs-tag">&lt;/<span class="hljs-name">name</span>&gt;</span>
@@ -195,19 +195,19 @@ and <a href="https://github.com/GoogleCloudPlatform/bdutil/blob/master/conf/hado
 <p>Tested with Druid 0.17.0, Hadoop 2.8.5 and gcs-connector jar 2.0.0-hadoop2.</p>
 <h2><a class="anchor" aria-hidden="true" id="reading-data-from-hdfs-or-cloud-storage"></a><a href="#reading-data-from-hdfs-or-cloud-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2  [...]
 <h3><a class="anchor" aria-hidden="true" id="native-batch-ingestion"></a><a href="#native-batch-ingestion" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0 [...]
-<p>The <a href="/docs/latest/ingestion/native-batch.html#hdfs-input-source">HDFS input source</a> is supported by the <a href="/docs/latest/ingestion/native-batch.html#parallel-task">Parallel task</a>
+<p>The <a href="/docs/0.21.0/ingestion/native-batch.html#hdfs-input-source">HDFS input source</a> is supported by the <a href="/docs/0.21.0/ingestion/native-batch.html#parallel-task">Parallel task</a>
 to read files directly from the HDFS Storage. You may be able to read objects from cloud storage
 with the HDFS input source, but we highly recommend to use a proper
-<a href="/docs/latest/ingestion/native-batch.html#input-sources">Input Source</a> instead if possible because
-it is simple to set up. For now, only the <a href="/docs/latest/ingestion/native-batch.html#s3-input-source">S3 input source</a>
-and the <a href="/docs/latest/ingestion/native-batch.html#google-cloud-storage-input-source">Google Cloud Storage input source</a>
+<a href="/docs/0.21.0/ingestion/native-batch.html#input-sources">Input Source</a> instead if possible because
+it is simple to set up. For now, only the <a href="/docs/0.21.0/ingestion/native-batch.html#s3-input-source">S3 input source</a>
+and the <a href="/docs/0.21.0/ingestion/native-batch.html#google-cloud-storage-input-source">Google Cloud Storage input source</a>
 are supported for cloud storage types, and so you may still want to use the HDFS input source
 to read from cloud storage other than those two.</p>
 <h3><a class="anchor" aria-hidden="true" id="hadoop-based-ingestion"></a><a href="#hadoop-based-ingestion" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0 [...]
-<p>If you use the <a href="/docs/latest/ingestion/hadoop.html">Hadoop ingestion</a>, you can read data from HDFS
-by specifying the paths in your <a href="/docs/latest/ingestion/hadoop.html#inputspec"><code>inputSpec</code></a>.
-See the <a href="/docs/latest/ingestion/hadoop.html#static">Static</a> inputSpec for details.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-core/google.html"><span class="arrow-prev">← </span><span>Google Cloud Storage</span></a><a class="docs-next button" href="/docs/latest/development/extensions-core/kafka-extraction-namespace.html"><span>Apache Kafka Lookups</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#deep-storage">Deep [...]
+<p>If you use the <a href="/docs/0.21.0/ingestion/hadoop.html">Hadoop ingestion</a>, you can read data from HDFS
+by specifying the paths in your <a href="/docs/0.21.0/ingestion/hadoop.html#inputspec"><code>inputSpec</code></a>.
+See the <a href="/docs/0.21.0/ingestion/hadoop.html#static">Static</a> inputSpec for details.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/google.html"><span class="arrow-prev">← </span><span>Google Cloud Storage</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/kafka-extraction-namespace.html"><span>Apache Kafka Lookups</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#deep-storage">Deep [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -224,6 +224,6 @@ See the <a href="/docs/latest/ingestion/hadoop.html#static">Static</a> inputSpec
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/development/extensions-core/kafka-eight-firehose.html b/docs/0.21.0/development/extensions-core/kafka-eight-firehose.html
new file mode 100644
index 0000000..4d4bfd2
--- /dev/null
+++ b/docs/0.21.0/development/extensions-core/kafka-eight-firehose.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="../../ingestion/standalone-realtime.html">
+<meta http-equiv="refresh" content="0; url=../../ingestion/standalone-realtime.html">
+<h1>Redirecting...</h1>
+<a href="../../ingestion/standalone-realtime.html">Click here if you are not redirected.</a>
+<script>location="../../ingestion/standalone-realtime.html"</script>
diff --git a/docs/latest/development/extensions-core/kafka-extraction-namespace.html b/docs/0.21.0/development/extensions-core/kafka-extraction-namespace.html
similarity index 51%
copy from docs/latest/development/extensions-core/kafka-extraction-namespace.html
copy to docs/0.21.0/development/extensions-core/kafka-extraction-namespace.html
index ca0483c..ab7ff1c 100644
--- a/docs/latest/development/extensions-core/kafka-extraction-namespace.html
+++ b/docs/0.21.0/development/extensions-core/kafka-extraction-namespace.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Apache Kafka Lookups · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/kafka-extraction-namespace.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="do [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Apache Kafka Lookups · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/kafka-extraction-namespace.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="do [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -78,9 +78,9 @@
   ~ under the License.
   -->
 <blockquote>
-<p>Lookups are an <a href="/docs/latest/development/experimental.html">experimental</a> feature.</p>
+<p>Lookups are an <a href="/docs/0.21.0/development/experimental.html">experimental</a> feature.</p>
 </blockquote>
-<p>To use this Apache Druid extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>druid-lookups-cached-global</code> and <code>druid-kafka-extraction-namespace</code> as an extension.</p>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-lookups-cached-global</code> and <code>druid-kafka-extraction-namespace</code> as an extension.</p>
 <p>If you need updates to populate as promptly as possible, it is possible to plug into a Kafka topic whose key is the old value and message is the desired new value (both in UTF-8) as a LookupExtractorFactory.</p>
 <pre><code class="hljs css language-json">{
   <span class="hljs-attr">"type"</span>:<span class="hljs-string">"kafka"</span>,
@@ -96,12 +96,12 @@
 <tr><td><code>kafkaTopic</code></td><td>The Kafka topic to read the data from</td><td>Yes</td><td></td></tr>
 <tr><td><code>kafkaProperties</code></td><td>Kafka consumer properties. At least&quot;zookeeper.connect&quot; must be specified. Only the zookeeper connector is supported</td><td>Yes</td><td></td></tr>
 <tr><td><code>connectTimeout</code></td><td>How long to wait for an initial connection</td><td>No</td><td><code>0</code> (do not wait)</td></tr>
-<tr><td><code>isOneToOne</code></td><td>The map is a one-to-one (see <a href="/docs/latest/querying/dimensionspecs.html">Lookup DimensionSpecs</a>)</td><td>No</td><td><code>false</code></td></tr>
+<tr><td><code>isOneToOne</code></td><td>The map is a one-to-one (see <a href="/docs/0.21.0/querying/dimensionspecs.html">Lookup DimensionSpecs</a>)</td><td>No</td><td><code>false</code></td></tr>
 </tbody>
 </table>
 <p>The extension <code>kafka-extraction-namespace</code> enables reading from a Kafka feed which has name/key pairs to allow renaming of dimension values. An example use case would be to rename an ID to a human readable format.</p>
 <p>The consumer properties <code>group.id</code> and <code>auto.offset.reset</code> CANNOT be set in <code>kafkaProperties</code> as they are set by the extension as <code>UUID.randomUUID().toString()</code> and <code>smallest</code> respectively.</p>
-<p>See <a href="/docs/latest/querying/lookups.html">lookups</a> for how to configure and use lookups.</p>
+<p>See <a href="/docs/0.21.0/querying/lookups.html">lookups</a> for how to configure and use lookups.</p>
 <h2><a class="anchor" aria-hidden="true" id="limitations"></a><a href="#limitations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42 [...]
 <p>Currently the Kafka lookup extractor feeds the entire Kafka stream into a local cache. If you are using on-heap caching, this can easily clobber your java heap if the Kafka stream spews a lot of unique keys.
 off-heap caching should alleviate these concerns, but there is still a limit to the quantity of data that can be stored.
@@ -111,7 +111,7 @@ There is currently no eviction policy.</p>
 <pre><code class="hljs">./bin/kafka-console-producer.sh --<span class="hljs-keyword">property</span><span class="hljs-title"> </span>parse.<span class="hljs-attr">key=</span><span class="hljs-literal">true</span> --<span class="hljs-keyword">property</span><span class="hljs-title"> </span>key.<span class="hljs-attr">separator=</span><span class="hljs-string">"-&gt;"</span> --broker-list localhost:<span class="hljs-number">9092</span> --topic testTopic
 </code></pre>
 <p>Renames can then be published as <code>OLD_VAL-&gt;NEW_VAL</code> followed by newline (enter or return)</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-core/hdfs.html"><span class="arrow-prev">← </span><span>HDFS</span></a><a class="docs-next button" href="/docs/latest/development/extensions-core/lookups-cached-global.html"><span>Globally Cached Lookups</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#limitations">Limitations</a></li><li>< [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/hdfs.html"><span class="arrow-prev">← </span><span>HDFS</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/lookups-cached-global.html"><span>Globally Cached Lookups</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#limitations">Limitations</a></li><li>< [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -128,6 +128,6 @@ There is currently no eviction policy.</p>
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/kafka-ingestion.html b/docs/0.21.0/development/extensions-core/kafka-ingestion.html
similarity index 74%
copy from docs/latest/development/extensions-core/kafka-ingestion.html
copy to docs/0.21.0/development/extensions-core/kafka-ingestion.html
index cc488ac..d871ccd 100644
--- a/docs/latest/development/extensions-core/kafka-ingestion.html
+++ b/docs/0.21.0/development/extensions-core/kafka-ingestion.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Apache Kafka ingestion · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/kafka-ingestion.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:v [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Apache Kafka ingestion · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/kafka-ingestion.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:v [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -83,16 +83,18 @@ partition and offset mechanism and are therefore able to provide guarantees of e
 The supervisor oversees the state of the indexing tasks to coordinate handoffs,
 manage failures, and ensure that the scalability and replication requirements are maintained.</p>
 <p>This service is provided in the <code>druid-kafka-indexing-service</code> core Apache Druid extension (see
-<a href="/docs/latest/development/extensions.html#loading-extensions">Including Extensions</a>).</p>
+<a href="/docs/0.21.0/development/extensions.html#loading-extensions">Including Extensions</a>).</p>
 <blockquote>
-<p>The Kafka indexing service supports transactional topics which were introduced in Kafka 0.11.x. These changes make the
+<p>The Kafka indexing service supports transactional topics which were introduced in Kafka 0.11.x. It is the default behavior of Druid and make the
 Kafka consumer that Druid uses incompatible with older brokers. Ensure that your Kafka brokers are version 0.11.x or
 better before using this functionality. Refer <a href="https://kafka.apache.org/documentation/#upgrade">Kafka upgrade guide</a>
-if you are using older version of Kafka brokers.</p>
+if you are using older version of Kafka brokers.
+In addition, users could set <code>isolation.level</code> <code>read_uncommitted</code> in <code>consumerProperties</code>, if don't need Druid to consume transactional topics or need Druid to consume older versions of Kafka.
+Make sure offsets are sequential, since there is no offset gap check in Druid anymore.</p>
 </blockquote>
 <h2><a class="anchor" aria-hidden="true" id="tutorial"></a><a href="#tutorial" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64  [...]
 <p>This page contains reference documentation for Apache Kafka-based ingestion.
-For a walk-through instead, check out the <a href="/docs/latest/tutorials/tutorial-kafka.html">Loading from Apache Kafka</a> tutorial.</p>
+For a walk-through instead, check out the <a href="/docs/0.21.0/tutorials/tutorial-kafka.html">Loading from Apache Kafka</a> tutorial.</p>
 <h2><a class="anchor" aria-hidden="true" id="submitting-a-supervisor-spec"></a><a href="#submitting-a-supervisor-spec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 [...]
 <p>The Kafka indexing service requires that the <code>druid-kafka-indexing-service</code> extension be loaded on both the Overlord and the
 MiddleManagers. A supervisor for a dataSource is started by submitting a supervisor spec via HTTP POST to
@@ -167,7 +169,7 @@ MiddleManagers. A supervisor for a dataSource is started by submitting a supervi
 </thead>
 <tbody>
 <tr><td><code>type</code></td><td>The supervisor type, this should always be <code>kafka</code>.</td><td>yes</td></tr>
-<tr><td><code>dataSchema</code></td><td>The schema that will be used by the Kafka indexing task during ingestion. See <a href="/docs/latest/ingestion/index.html#dataschema"><code>dataSchema</code></a> for details.</td><td>yes</td></tr>
+<tr><td><code>dataSchema</code></td><td>The schema that will be used by the Kafka indexing task during ingestion. See <a href="/docs/0.21.0/ingestion/index.html#dataschema"><code>dataSchema</code></a> for details.</td><td>yes</td></tr>
 <tr><td><code>ioConfig</code></td><td>A KafkaSupervisorIOConfig object for configuring Kafka connection and I/O-related settings for the supervisor and indexing task. See <a href="#kafkasupervisorioconfig">KafkaSupervisorIOConfig</a> below.</td><td>yes</td></tr>
 <tr><td><code>tuningConfig</code></td><td>A KafkaSupervisorTuningConfig object for configuring performance-related settings for the supervisor and indexing tasks. See <a href="#kafkasupervisortuningconfig">KafkaSupervisorTuningConfig</a> below.</td><td>no</td></tr>
 </tbody>
@@ -179,8 +181,8 @@ MiddleManagers. A supervisor for a dataSource is started by submitting a supervi
 </thead>
 <tbody>
 <tr><td><code>topic</code></td><td>String</td><td>The Kafka topic to read from. This must be a specific topic as topic patterns are not supported.</td><td>yes</td></tr>
-<tr><td><code>inputFormat</code></td><td>Object</td><td><a href="/docs/latest/ingestion/data-formats.html#input-format"><code>inputFormat</code></a> to specify how to parse input data. See <a href="#specifying-data-format">the below section</a> for details about specifying the input format.</td><td>yes</td></tr>
-<tr><td><code>consumerProperties</code></td><td>Map&lt;String, Object&gt;</td><td>A map of properties to be passed to the Kafka consumer. This must contain a property <code>bootstrap.servers</code> with a list of Kafka brokers in the form: <code>&lt;BROKER_1&gt;:&lt;PORT_1&gt;,&lt;BROKER_2&gt;:&lt;PORT_2&gt;,...</code>. For SSL connections, the <code>keystore</code>, <code>truststore</code> and <code>key</code> passwords can be provided as a <a href="/docs/latest/operations/password-prov [...]
+<tr><td><code>inputFormat</code></td><td>Object</td><td><a href="/docs/0.21.0/ingestion/data-formats.html#input-format"><code>inputFormat</code></a> to specify how to parse input data. See <a href="#specifying-data-format">the below section</a> for details about specifying the input format.</td><td>yes</td></tr>
+<tr><td><code>consumerProperties</code></td><td>Map&lt;String, Object&gt;</td><td>A map of properties to be passed to the Kafka consumer. See <a href="#more-on-consumerproperties">next section</a> for more information.</td><td>yes</td></tr>
 <tr><td><code>pollTimeout</code></td><td>Long</td><td>The length of time to wait for the Kafka consumer to poll records, in milliseconds</td><td>no (default == 100)</td></tr>
 <tr><td><code>replicas</code></td><td>Integer</td><td>The number of replica sets, where 1 means a single set of tasks (no replication). Replica tasks will always be assigned to different workers to provide resiliency against process failure.</td><td>no (default == 1)</td></tr>
 <tr><td><code>taskCount</code></td><td>Integer</td><td>The maximum number of <em>reading</em> tasks in a <em>replica set</em>. This means that the maximum number of reading tasks will be <code>taskCount * replicas</code> and the total number of tasks (<em>reading</em> + <em>publishing</em>) will be higher than this. See <a href="#capacity-planning">Capacity Planning</a> below for more details. The number of reading tasks will be less than <code>taskCount</code> if <code>taskCount &gt; {n [...]
@@ -194,16 +196,24 @@ MiddleManagers. A supervisor for a dataSource is started by submitting a supervi
 <tr><td><code>earlyMessageRejectionPeriod</code></td><td>ISO8601 Period</td><td>Configure tasks to reject messages with timestamps later than this period after the task reached its taskDuration; for example if this is set to <code>PT1H</code>, the taskDuration is set to <code>PT1H</code> and the supervisor creates a task at <em>2016-01-01T12:00Z</em>, messages with timestamps later than <em>2016-01-01T14:00Z</em> will be dropped. <strong>Note:</strong> Tasks sometimes run past their task [...]
 </tbody>
 </table>
+<h4><a class="anchor" aria-hidden="true" id="more-on-consumerproperties"></a><a href="#more-on-consumerproperties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H [...]
+<p>This must contain a property <code>bootstrap.servers</code> with a list of Kafka brokers in the form: <code>&lt;BROKER_1&gt;:&lt;PORT_1&gt;,&lt;BROKER_2&gt;:&lt;PORT_2&gt;,...</code>.
+By default, <code>isolation.level</code> is set to <code>read_committed</code>. It should be set to <code>read_uncommitted</code> if you don't want Druid to consume only committed transactions or working with older versions of Kafka servers with no Transactions support.</p>
+<p>There are few cases that require fetching few/all of consumer properties at runtime e.g. when <code>bootstrap.servers</code> is not known upfront or not static, to enable SSL connections users might have to provide passwords for <code>keystore</code>, <code>truststore</code> and <code>key</code> secretly.
+For such consumer properties, user can implement a <a href="/docs/0.21.0/operations/dynamic-config-provider.html">DynamicConfigProvider</a> to supply them at runtime, by adding
+<code>druid.dynamic.config.provider</code>=<code>{&quot;type&quot;: &quot;&lt;registered_dynamic_config_provider_name&gt;&quot;, ...}</code>
+in consumerProperties map.</p>
+<p>Note: In 0.20.0 or older Druid versions, for SSL connections, the <code>keystore</code>, <code>truststore</code> and <code>key</code> passwords can also be provided as a <a href="/docs/0.21.0/operations/password-provider.html">Password Provider</a>. This is deprecated.</p>
 <h4><a class="anchor" aria-hidden="true" id="specifying-data-format"></a><a href="#specifying-data-format" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0 [...]
-<p>Kafka indexing service supports both <a href="/docs/latest/ingestion/data-formats.html#input-format"><code>inputFormat</code></a> and <a href="/docs/latest/ingestion/data-formats.html#parser"><code>parser</code></a> to specify the data format.
+<p>Kafka indexing service supports both <a href="/docs/0.21.0/ingestion/data-formats.html#input-format"><code>inputFormat</code></a> and <a href="/docs/0.21.0/ingestion/data-formats.html#parser"><code>parser</code></a> to specify the data format.
 The <code>inputFormat</code> is a new and recommended way to specify the data format for Kafka indexing service,
 but unfortunately, it doesn't support all data formats supported by the legacy <code>parser</code>.
 (They will be supported in the future.)</p>
-<p>The supported <code>inputFormat</code>s include <a href="/docs/latest/ingestion/data-formats.html#csv"><code>csv</code></a>,
-<a href="/docs/latest/ingestion/data-formats.html#tsv-delimited"><code>delimited</code></a>, and <a href="/docs/latest/ingestion/data-formats.html#json"><code>json</code></a>.
-You can also read <a href="/docs/latest/ingestion/data-formats.html#avro-stream-parser"><code>avro_stream</code></a>,
-<a href="/docs/latest/ingestion/data-formats.html#protobuf-parser"><code>protobuf</code></a>,
-and <a href="/docs/latest/development/extensions-contrib/thrift.html"><code>thrift</code></a> formats using <code>parser</code>.</p>
+<p>The supported <code>inputFormat</code>s include <a href="/docs/0.21.0/ingestion/data-formats.html#csv"><code>csv</code></a>,
+<a href="/docs/0.21.0/ingestion/data-formats.html#tsv-delimited"><code>delimited</code></a>, and <a href="/docs/0.21.0/ingestion/data-formats.html#json"><code>json</code></a>.
+You can also read <a href="/docs/0.21.0/ingestion/data-formats.html#avro-stream-parser"><code>avro_stream</code></a>,
+<a href="/docs/0.21.0/ingestion/data-formats.html#protobuf-parser"><code>protobuf</code></a>,
+and <a href="/docs/0.21.0/development/extensions-contrib/thrift.html"><code>thrift</code></a> formats using <code>parser</code>.</p>
 <p><a name="tuningconfig"></a></p>
 <h3><a class="anchor" aria-hidden="true" id="kafkasupervisortuningconfig"></a><a href="#kafkasupervisortuningconfig" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 1 [...]
 <p>The tuningConfig is optional and default parameters will be used if no tuningConfig is specified.</p>
@@ -223,7 +233,7 @@ and <a href="/docs/latest/development/extensions-contrib/thrift.html"><code>thri
 <tr><td><code>indexSpecForIntermediatePersists</code></td><td></td><td>Defines segment storage format options to be used at indexing time for intermediate persisted temporary segments. This can be used to disable dimension/metric compression on intermediate segments to reduce memory required for final merging. However, disabling compression on intermediate segments might increase page cache use while they are used before getting merged into final segment published, see <a href="#indexspe [...]
 <tr><td><code>reportParseExceptions</code></td><td>Boolean</td><td><em>DEPRECATED</em>. If true, exceptions encountered during parsing will be thrown and will halt ingestion; if false, unparseable rows and fields will be skipped. Setting <code>reportParseExceptions</code> to true will override existing configurations for <code>maxParseExceptions</code> and <code>maxSavedParseExceptions</code>, setting <code>maxParseExceptions</code> to 0 and limiting <code>maxSavedParseExceptions</code>  [...]
 <tr><td><code>handoffConditionTimeout</code></td><td>Long</td><td>Milliseconds to wait for segment handoff. It must be &gt;= 0, where 0 means to wait forever.</td><td>no (default == 0)</td></tr>
-<tr><td><code>resetOffsetAutomatically</code></td><td>Boolean</td><td>Controls behavior when Druid needs to read Kafka messages that are no longer available (i.e. when OffsetOutOfRangeException is encountered).<br/><br/>If false, the exception will bubble up, which will cause your tasks to fail and ingestion to halt. If this occurs, manual intervention is required to correct the situation; potentially using the <a href="../../operations/api-reference.html#supervisors">Reset Supervisor AP [...]
+<tr><td><code>resetOffsetAutomatically</code></td><td>Boolean</td><td>Controls behavior when Druid needs to read Kafka messages that are no longer available (i.e. when OffsetOutOfRangeException is encountered).<br/><br/>If false, the exception will bubble up, which will cause your tasks to fail and ingestion to halt. If this occurs, manual intervention is required to correct the situation; potentially using the <a href="/docs/0.21.0/operations/api-reference.html#supervisors">Reset Superv [...]
 <tr><td><code>workerThreads</code></td><td>Integer</td><td>The number of threads that the supervisor uses to handle requests/responses for worker tasks, along with any other internal asynchronous operation.</td><td>no (default == min(10, taskCount))</td></tr>
 <tr><td><code>chatThreads</code></td><td>Integer</td><td>The number of threads that will be used for communicating with indexing tasks.</td><td>no (default == min(10, taskCount * replicas))</td></tr>
 <tr><td><code>chatRetries</code></td><td>Integer</td><td>The number of times HTTP requests to indexing tasks will be retried before considering tasks unresponsive.</td><td>no (default == 8)</td></tr>
@@ -234,7 +244,7 @@ and <a href="/docs/latest/development/extensions-contrib/thrift.html"><code>thri
 <tr><td><code>intermediateHandoffPeriod</code></td><td>ISO8601 Period</td><td>How often the tasks should hand off segments. Handoff will happen either if <code>maxRowsPerSegment</code> or <code>maxTotalRows</code> is hit or every <code>intermediateHandoffPeriod</code>, whichever happens earlier.</td><td>no (default == P2147483647D)</td></tr>
 <tr><td><code>logParseExceptions</code></td><td>Boolean</td><td>If true, log an error message when a parsing exception occurs, containing information about the row where the error occurred.</td><td>no, default == false</td></tr>
 <tr><td><code>maxParseExceptions</code></td><td>Integer</td><td>The maximum number of parse exceptions that can occur before the task halts ingestion and fails. Overridden if <code>reportParseExceptions</code> is set.</td><td>no, unlimited default</td></tr>
-<tr><td><code>maxSavedParseExceptions</code></td><td>Integer</td><td>When a parse exception occurs, Druid can keep track of the most recent parse exceptions. &quot;maxSavedParseExceptions&quot; limits how many exception instances will be saved. These saved exceptions will be made available after the task finishes in the <a href="/docs/latest/ingestion/tasks.html#reports">task completion report</a>. Overridden if <code>reportParseExceptions</code> is set.</td><td>no, default == 0</td></tr>
+<tr><td><code>maxSavedParseExceptions</code></td><td>Integer</td><td>When a parse exception occurs, Druid can keep track of the most recent parse exceptions. &quot;maxSavedParseExceptions&quot; limits how many exception instances will be saved. These saved exceptions will be made available after the task finishes in the <a href="/docs/0.21.0/ingestion/tasks.html#reports">task completion report</a>. Overridden if <code>reportParseExceptions</code> is set.</td><td>no, default == 0</td></tr>
 </tbody>
 </table>
 <h4><a class="anchor" aria-hidden="true" id="indexspec"></a><a href="#indexspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.6 [...]
@@ -275,12 +285,12 @@ and <a href="/docs/latest/development/extensions-contrib/thrift.html"><code>thri
 <tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
 </thead>
 <tbody>
-<tr><td><code>type</code></td><td>String</td><td>See <a href="../../configuration/index.html#segmentwriteoutmediumfactory">Additional Peon Configuration: SegmentWriteOutMediumFactory</a> for explanation and available options.</td><td>yes</td></tr>
+<tr><td><code>type</code></td><td>String</td><td>See <a href="/docs/0.21.0/configuration/index.html#segmentwriteoutmediumfactory">Additional Peon Configuration: SegmentWriteOutMediumFactory</a> for explanation and available options.</td><td>yes</td></tr>
 </tbody>
 </table>
 <h2><a class="anchor" aria-hidden="true" id="operations"></a><a href="#operations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1 [...]
 <p>This section gives descriptions of how some supervisor APIs work specifically in Kafka Indexing Service.
-For all supervisor APIs, please check <a href="../../operations/api-reference.html#supervisors">Supervisor APIs</a>.</p>
+For all supervisor APIs, please check <a href="/docs/0.21.0/operations/api-reference.html#supervisors">Supervisor APIs</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="getting-supervisor-status-report"></a><a href="#getting-supervisor-status-report" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13. [...]
 <p><code>GET /druid/indexer/v1/supervisor/&lt;supervisorId&gt;/status</code> returns a snapshot report of the current state of the tasks managed by the given supervisor. This includes the latest
 offsets as reported by Kafka, the consumer lag per partition, as well as the aggregate lag of all partitions. The
@@ -332,7 +342,7 @@ that is, once it has completed a full execution without encountering any issues
 state until it is stopped, suspended, or hits a failure threshold and transitions to an unhealthy state.</p>
 <h3><a class="anchor" aria-hidden="true" id="getting-supervisor-ingestion-stats-report"></a><a href="#getting-supervisor-ingestion-stats-report" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1  [...]
 <p><code>GET /druid/indexer/v1/supervisor/&lt;supervisorId&gt;/stats</code> returns a snapshot of the current ingestion row counters for each task being managed by the supervisor, along with moving averages for the row counters.</p>
-<p>See <a href="/docs/latest/ingestion/tasks.html#row-stats">Task Reports: Row Stats</a> for more information.</p>
+<p>See <a href="/docs/0.21.0/ingestion/tasks.html#row-stats">Task Reports: Row Stats</a> for more information.</p>
 <h3><a class="anchor" aria-hidden="true" id="supervisor-health-check"></a><a href="#supervisor-health-check" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 [...]
 <p><code>GET /druid/indexer/v1/supervisor/&lt;supervisorId&gt;/health</code> returns <code>200 OK</code> if the supervisor is healthy and
 <code>503 Service Unavailable</code> if it is unhealthy. Healthiness is determined by the supervisor's <code>state</code> (as returned by the
@@ -434,10 +444,10 @@ without accumulating old segments locally on Middle Manager processes and it is
 is set to an HOUR and Supervisor was started at 9:10 then after 4 hours at 13:10, new set of tasks will be started and
 events for the interval 13:00 - 14:00 may be split across previous and new set of tasks. If you see it becoming a problem then
 one can schedule re-indexing tasks be run to merge segments together into new segments of an ideal size (in the range of ~500-700 MB per segment).
-Details on how to optimize the segment size can be found on <a href="/docs/latest/operations/segment-optimization.html">Segment size optimization</a>.
+Details on how to optimize the segment size can be found on <a href="/docs/0.21.0/operations/segment-optimization.html">Segment size optimization</a>.
 There is also ongoing work to support automatic segment compaction of sharded segments as well as compaction not requiring
 Hadoop (see <a href="https://github.com/apache/druid/pull/5102">here</a>).</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/ingestion/data-management.html"><span class="arrow-prev">← </span><span>Data management</span></a><a class="docs-next button" href="/docs/latest/development/extensions-core/kinesis-ingestion.html"><span>Amazon Kinesis</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#tutorial">Tutorial</a></li><li><a href="#submit [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/ingestion/data-management.html"><span class="arrow-prev">← </span><span>Data management</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/kinesis-ingestion.html"><span>Amazon Kinesis</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#tutorial">Tutorial</a></li><li><a href="#submit [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -454,6 +464,6 @@ Hadoop (see <a href="https://github.com/apache/druid/pull/5102">here</a>).</p>
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/kinesis-ingestion.html b/docs/0.21.0/development/extensions-core/kinesis-ingestion.html
similarity index 77%
copy from docs/latest/development/extensions-core/kinesis-ingestion.html
copy to docs/0.21.0/development/extensions-core/kinesis-ingestion.html
index 8fca34d..70b6dde 100644
--- a/docs/latest/development/extensions-core/kinesis-ingestion.html
+++ b/docs/0.21.0/development/extensions-core/kinesis-ingestion.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Amazon Kinesis ingestion · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/kinesis-ingestion.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsear [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Amazon Kinesis ingestion · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/kinesis-ingestion.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsear [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,15 +77,15 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>Similar to the <a href="/docs/latest/development/extensions-core/kafka-ingestion.html">Kafka indexing service</a>, the Kinesis indexing service enables the configuration of <em>supervisors</em> on the Overlord, which facilitate ingestion from
+<p>Similar to the <a href="/docs/0.21.0/development/extensions-core/kafka-ingestion.html">Kafka indexing service</a>, the Kinesis indexing service enables the configuration of <em>supervisors</em> on the Overlord, which facilitate ingestion from
 Kinesis by managing the creation and lifetime of Kinesis indexing tasks. These indexing tasks read events using Kinesis's own
 Shards and Sequence Number mechanism and are therefore able to provide guarantees of exactly-once ingestion.
 The supervisor oversees the state of the indexing tasks to coordinate handoffs, manage failures,
 and ensure that the scalability and replication requirements are maintained.</p>
 <p>The Kinesis indexing service is provided as the <code>druid-kinesis-indexing-service</code> core Apache Druid extension (see
-<a href="/docs/latest/development/extensions.html#loading-extensions">Including Extensions</a>). Please note that this is
+<a href="/docs/0.21.0/development/extensions.html#loading-extensions">Including Extensions</a>). Please note that this is
 currently designated as an <em>experimental feature</em> and is subject to the usual
-<a href="/docs/latest/development/experimental.html">experimental caveats</a>.</p>
+<a href="/docs/0.21.0/development/experimental.html">experimental caveats</a>.</p>
 <h2><a class="anchor" aria-hidden="true" id="submitting-a-supervisor-spec"></a><a href="#submitting-a-supervisor-spec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 [...]
 <p>The Kinesis indexing service requires that the <code>druid-kinesis-indexing-service</code> extension be loaded on both the Overlord
 and the MiddleManagers. A supervisor for a dataSource is started by submitting a supervisor spec via HTTP POST to
@@ -160,7 +160,7 @@ and the MiddleManagers. A supervisor for a dataSource is started by submitting a
 </thead>
 <tbody>
 <tr><td><code>type</code></td><td>The supervisor type, this should always be <code>kinesis</code>.</td><td>yes</td></tr>
-<tr><td><code>dataSchema</code></td><td>The schema that will be used by the Kinesis indexing task during ingestion. See <a href="/docs/latest/ingestion/index.html#dataschema"><code>dataSchema</code></a>.</td><td>yes</td></tr>
+<tr><td><code>dataSchema</code></td><td>The schema that will be used by the Kinesis indexing task during ingestion. See <a href="/docs/0.21.0/ingestion/index.html#dataschema"><code>dataSchema</code></a>.</td><td>yes</td></tr>
 <tr><td><code>ioConfig</code></td><td>A KinesisSupervisorIOConfig object for configuring Kafka connection and I/O-related settings for the supervisor and indexing task. See <a href="#kinesissupervisorioconfig">KinesisSupervisorIOConfig</a> below.</td><td>yes</td></tr>
 <tr><td><code>tuningConfig</code></td><td>A KinesisSupervisorTuningConfig object for configuring performance-related settings for the supervisor and indexing tasks. See <a href="#kinesissupervisortuningconfig">KinesisSupervisorTuningConfig</a> below.</td><td>no</td></tr>
 </tbody>
@@ -172,7 +172,7 @@ and the MiddleManagers. A supervisor for a dataSource is started by submitting a
 </thead>
 <tbody>
 <tr><td><code>stream</code></td><td>String</td><td>The Kinesis stream to read.</td><td>yes</td></tr>
-<tr><td><code>inputFormat</code></td><td>Object</td><td><a href="/docs/latest/ingestion/data-formats.html#input-format"><code>inputFormat</code></a> to specify how to parse input data. See <a href="#specifying-data-format">the below section</a> for details about specifying the input format.</td><td>yes</td></tr>
+<tr><td><code>inputFormat</code></td><td>Object</td><td><a href="/docs/0.21.0/ingestion/data-formats.html#input-format"><code>inputFormat</code></a> to specify how to parse input data. See <a href="#specifying-data-format">the below section</a> for details about specifying the input format.</td><td>yes</td></tr>
 <tr><td><code>endpoint</code></td><td>String</td><td>The AWS Kinesis stream endpoint for a region. You can find a list of endpoints <a href="http://docs.aws.amazon.com/general/latest/gr/rande.html#ak_region">here</a>.</td><td>no (default == kinesis.us-east-1.amazonaws.com)</td></tr>
 <tr><td><code>replicas</code></td><td>Integer</td><td>The number of replica sets, where 1 means a single set of tasks (no replication). Replica tasks will always be assigned to different workers to provide resiliency against process failure.</td><td>no (default == 1)</td></tr>
 <tr><td><code>taskCount</code></td><td>Integer</td><td>The maximum number of <em>reading</em> tasks in a <em>replica set</em>. This means that the maximum number of reading tasks will be <code>taskCount * replicas</code> and the total number of tasks (<em>reading</em> + <em>publishing</em>) will be higher than this. See <a href="#capacity-planning">Capacity Planning</a> below for more details. The number of reading tasks will be less than <code>taskCount</code> if <code>taskCount &gt; {n [...]
@@ -191,15 +191,15 @@ and the MiddleManagers. A supervisor for a dataSource is started by submitting a
 </tbody>
 </table>
 <h4><a class="anchor" aria-hidden="true" id="specifying-data-format"></a><a href="#specifying-data-format" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0 [...]
-<p>Kinesis indexing service supports both <a href="/docs/latest/ingestion/data-formats.html#input-format"><code>inputFormat</code></a> and <a href="/docs/latest/ingestion/data-formats.html#parser"><code>parser</code></a> to specify the data format.
+<p>Kinesis indexing service supports both <a href="/docs/0.21.0/ingestion/data-formats.html#input-format"><code>inputFormat</code></a> and <a href="/docs/0.21.0/ingestion/data-formats.html#parser"><code>parser</code></a> to specify the data format.
 The <code>inputFormat</code> is a new and recommended way to specify the data format for Kinesis indexing service,
 but unfortunately, it doesn't support all data formats supported by the legacy <code>parser</code>.
 (They will be supported in the future.)</p>
-<p>The supported <code>inputFormat</code>s include <a href="/docs/latest/ingestion/data-formats.html#csv"><code>csv</code></a>,
-<a href="/docs/latest/ingestion/data-formats.html#tsv-delimited"><code>delimited</code></a>, and <a href="/docs/latest/ingestion/data-formats.html#json"><code>json</code></a>.
-You can also read <a href="/docs/latest/ingestion/data-formats.html#avro-stream-parser"><code>avro_stream</code></a>,
-<a href="/docs/latest/ingestion/data-formats.html#protobuf-parser"><code>protobuf</code></a>,
-and <a href="/docs/latest/development/extensions-contrib/thrift.html"><code>thrift</code></a> formats using <code>parser</code>.</p>
+<p>The supported <code>inputFormat</code>s include <a href="/docs/0.21.0/ingestion/data-formats.html#csv"><code>csv</code></a>,
+<a href="/docs/0.21.0/ingestion/data-formats.html#tsv-delimited"><code>delimited</code></a>, and <a href="/docs/0.21.0/ingestion/data-formats.html#json"><code>json</code></a>.
+You can also read <a href="/docs/0.21.0/ingestion/data-formats.html#avro-stream-parser"><code>avro_stream</code></a>,
+<a href="/docs/0.21.0/ingestion/data-formats.html#protobuf-parser"><code>protobuf</code></a>,
+and <a href="/docs/0.21.0/development/extensions-contrib/thrift.html"><code>thrift</code></a> formats using <code>parser</code>.</p>
 <p><a name="tuningconfig"></a></p>
 <h3><a class="anchor" aria-hidden="true" id="kinesissupervisortuningconfig"></a><a href="#kinesissupervisortuningconfig" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12  [...]
 <p>The tuningConfig is optional and default parameters will be used if no tuningConfig is specified.</p>
@@ -219,7 +219,7 @@ and <a href="/docs/latest/development/extensions-contrib/thrift.html"><code>thri
 <tr><td><code>indexSpecForIntermediatePersists</code></td><td></td><td>Defines segment storage format options to be used at indexing time for intermediate persisted temporary segments. This can be used to disable dimension/metric compression on intermediate segments to reduce memory required for final merging. However, disabling compression on intermediate segments might increase page cache use while they are used before getting merged into final segment published, see <a href="#indexspe [...]
 <tr><td><code>reportParseExceptions</code></td><td>Boolean</td><td>If true, exceptions encountered during parsing will be thrown and will halt ingestion; if false, unparseable rows and fields will be skipped.</td><td>no (default == false)</td></tr>
 <tr><td><code>handoffConditionTimeout</code></td><td>Long</td><td>Milliseconds to wait for segment handoff. It must be &gt;= 0, where 0 means to wait forever.</td><td>no (default == 0)</td></tr>
-<tr><td><code>resetOffsetAutomatically</code></td><td>Boolean</td><td>Controls behavior when Druid needs to read Kinesis messages that are no longer available.<br/><br/>If false, the exception will bubble up, which will cause your tasks to fail and ingestion to halt. If this occurs, manual intervention is required to correct the situation; potentially using the <a href="../../operations/api-reference.html#supervisors">Reset Supervisor API</a>. This mode is useful for production, since it [...]
+<tr><td><code>resetOffsetAutomatically</code></td><td>Boolean</td><td>Controls behavior when Druid needs to read Kinesis messages that are no longer available.<br/><br/>If false, the exception will bubble up, which will cause your tasks to fail and ingestion to halt. If this occurs, manual intervention is required to correct the situation; potentially using the <a href="/docs/0.21.0/operations/api-reference.html#supervisors">Reset Supervisor API</a>. This mode is useful for production, s [...]
 <tr><td><code>skipSequenceNumberAvailabilityCheck</code></td><td>Boolean</td><td>Whether to enable checking if the current sequence number is still available in a particular Kinesis shard. If set to false, the indexing task will attempt to reset the current sequence number (or not), depending on the value of <code>resetOffsetAutomatically</code>.</td><td>no (default == false)</td></tr>
 <tr><td><code>workerThreads</code></td><td>Integer</td><td>The number of threads that the supervisor uses to handle requests/responses for worker tasks, along with any other internal asynchronous operation.</td><td>no (default == min(10, taskCount))</td></tr>
 <tr><td><code>chatThreads</code></td><td>Integer</td><td>The number of threads that will be used for communicating with indexing tasks.</td><td>no (default == min(10, taskCount * replicas))</td></tr>
@@ -235,9 +235,10 @@ and <a href="/docs/latest/development/extensions-contrib/thrift.html"><code>thri
 <tr><td><code>intermediateHandoffPeriod</code></td><td>ISO8601 Period</td><td>How often the tasks should hand off segments. Handoff will happen either if <code>maxRowsPerSegment</code> or <code>maxTotalRows</code> is hit or every <code>intermediateHandoffPeriod</code>, whichever happens earlier.</td><td>no (default == P2147483647D)</td></tr>
 <tr><td><code>logParseExceptions</code></td><td>Boolean</td><td>If true, log an error message when a parsing exception occurs, containing information about the row where the error occurred.</td><td>no, default == false</td></tr>
 <tr><td><code>maxParseExceptions</code></td><td>Integer</td><td>The maximum number of parse exceptions that can occur before the task halts ingestion and fails. Overridden if <code>reportParseExceptions</code> is set.</td><td>no, unlimited default</td></tr>
-<tr><td><code>maxSavedParseExceptions</code></td><td>Integer</td><td>When a parse exception occurs, Druid can keep track of the most recent parse exceptions. &quot;maxSavedParseExceptions&quot; limits how many exception instances will be saved. These saved exceptions will be made available after the task finishes in the <a href="/docs/latest/ingestion/tasks.html#reports">task completion report</a>. Overridden if <code>reportParseExceptions</code> is set.</td><td>no, default == 0</td></tr>
+<tr><td><code>maxSavedParseExceptions</code></td><td>Integer</td><td>When a parse exception occurs, Druid can keep track of the most recent parse exceptions. &quot;maxSavedParseExceptions&quot; limits how many exception instances will be saved. These saved exceptions will be made available after the task finishes in the <a href="/docs/0.21.0/ingestion/tasks.html#reports">task completion report</a>. Overridden if <code>reportParseExceptions</code> is set.</td><td>no, default == 0</td></tr>
 <tr><td><code>maxRecordsPerPoll</code></td><td>Integer</td><td>The maximum number of records/events to be fetched from buffer per poll. The actual maximum will be <code>Max(maxRecordsPerPoll, Max(bufferSize, 1))</code></td><td>no, default == 100</td></tr>
 <tr><td><code>repartitionTransitionDuration</code></td><td>ISO8601 Period</td><td>When shards are split or merged, the supervisor will recompute shard -&gt; task group mappings, and signal any running tasks created under the old mappings to stop early at (current time + <code>repartitionTransitionDuration</code>). Stopping the tasks early allows Druid to begin reading from the new shards more quickly. The repartition transition wait time controlled by this property gives the stream addit [...]
+<tr><td><code>offsetFetchPeriod</code></td><td>ISO8601 Period</td><td>How often the supervisor queries Kinesis and the indexing tasks to fetch current offsets and calculate lag.</td><td>no (default == PT30S, min == PT5S)</td></tr>
 </tbody>
 </table>
 <h4><a class="anchor" aria-hidden="true" id="indexspec"></a><a href="#indexspec" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.6 [...]
@@ -278,12 +279,12 @@ and <a href="/docs/latest/development/extensions-contrib/thrift.html"><code>thri
 <tr><th>Field</th><th>Type</th><th>Description</th><th>Required</th></tr>
 </thead>
 <tbody>
-<tr><td><code>type</code></td><td>String</td><td>See <a href="../../configuration/index.html#segmentwriteoutmediumfactory">Additional Peon Configuration: SegmentWriteOutMediumFactory</a> for explanation and available options.</td><td>yes</td></tr>
+<tr><td><code>type</code></td><td>String</td><td>See <a href="/docs/0.21.0/configuration/index.html#segmentwriteoutmediumfactory">Additional Peon Configuration: SegmentWriteOutMediumFactory</a> for explanation and available options.</td><td>yes</td></tr>
 </tbody>
 </table>
 <h2><a class="anchor" aria-hidden="true" id="operations"></a><a href="#operations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1 [...]
 <p>This section gives descriptions of how some supervisor APIs work specifically in Kinesis Indexing Service.
-For all supervisor APIs, please check <a href="../../operations/api-reference.html#supervisors">Supervisor APIs</a>.</p>
+For all supervisor APIs, please check <a href="/docs/0.21.0/operations/api-reference.html#supervisors">Supervisor APIs</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="aws-authentication"></a><a href="#aws-authentication" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22- [...]
 <p>To authenticate with AWS, you must provide your AWS access key and AWS secret key via runtime.properties, for example:</p>
 <pre><code class="hljs">-<span class="hljs-module-access"><span class="hljs-module"><span class="hljs-identifier">Ddruid</span>.</span></span>kinesis.accessKey=<span class="hljs-number">123</span> -<span class="hljs-module-access"><span class="hljs-module"><span class="hljs-identifier">Ddruid</span>.</span></span>kinesis.secretKey=<span class="hljs-number">456</span>
@@ -437,7 +438,7 @@ without accumulating old segments locally on Middle Manager processes and it is
 is set to an HOUR and Supervisor was started at 9:10 then after 4 hours at 13:10, new set of tasks will be started and
 events for the interval 13:00 - 14:00 may be split across previous and new set of tasks. If you see it becoming a problem then
 one can schedule re-indexing tasks be run to merge segments together into new segments of an ideal size (in the range of ~500-700 MB per segment).
-Details on how to optimize the segment size can be found on <a href="/docs/latest/operations/segment-optimization.html">Segment size optimization</a>.
+Details on how to optimize the segment size can be found on <a href="/docs/0.21.0/operations/segment-optimization.html">Segment size optimization</a>.
 There is also ongoing work to support automatic segment compaction of sharded segments as well as compaction not requiring
 Hadoop (see <a href="https://github.com/apache/druid/pull/5102">here</a>).</p>
 <h3><a class="anchor" aria-hidden="true" id="determining-fetch-settings"></a><a href="#determining-fetch-settings" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H [...]
@@ -483,7 +484,7 @@ with an assignment of closed shards that have been fully read and to ensure a ba
 <li>All closed shards have been fully read and the Kinesis ingestion tasks have published the data from those shards, committing the &quot;closed&quot; state to metadata storage</li>
 <li>Any remaining tasks that had inactive shards in the assignment have been shutdown (these tasks would have been created before the closed shards were completely drained)</li>
 </ul>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-core/kafka-ingestion.html"><span class="arrow-prev">← </span><span>Apache Kafka</span></a><a class="docs-next button" href="/docs/latest/ingestion/tranquility.html"><span>Tranquility</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#submitting-a-supervisor-spec">Submitting a Supervisor Spec< [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/kafka-ingestion.html"><span class="arrow-prev">← </span><span>Apache Kafka</span></a><a class="docs-next button" href="/docs/0.21.0/ingestion/tranquility.html"><span>Tranquility</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#submitting-a-supervisor-spec">Submitting a Supervisor Spec< [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -500,6 +501,6 @@ with an assignment of closed shards that have been fully read and to ensure a ba
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/lookups-cached-global.html b/docs/0.21.0/development/extensions-core/lookups-cached-global.html
similarity index 69%
copy from docs/latest/development/extensions-core/lookups-cached-global.html
copy to docs/0.21.0/development/extensions-core/lookups-cached-global.html
index d03d537..c1cb1bf 100644
--- a/docs/latest/development/extensions-core/lookups-cached-global.html
+++ b/docs/0.21.0/development/extensions-core/lookups-cached-global.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Globally Cached Lookups · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/lookups-cached-global.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docs [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Globally Cached Lookups · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/lookups-cached-global.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docs [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -78,19 +78,19 @@
   ~ under the License.
   -->
 <blockquote>
-<p>Lookups are an <a href="/docs/latest/development/experimental.html">experimental</a> feature.</p>
+<p>Lookups are an <a href="/docs/0.21.0/development/experimental.html">experimental</a> feature.</p>
 </blockquote>
-<p>To use this Apache Druid extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>druid-lookups-cached-global</code> as an extension.</p>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-lookups-cached-global</code> as an extension.</p>
 <h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
 <blockquote>
 <p>Static configuration is no longer supported. Lookups can be configured through
-<a href="/docs/latest/querying/lookups.html#configuration">dynamic configuration</a>.</p>
+<a href="/docs/0.21.0/querying/lookups.html#configuration">dynamic configuration</a>.</p>
 </blockquote>
 <p>Globally cached lookups are appropriate for lookups which are not possible to pass at query time due to their size,
 or are not desired to be passed at query time because the data is to reside in and be handled by the Druid servers,
 and are small enough to reasonably populate in-memory. This usually means tens to tens of thousands of entries per lookup.</p>
 <p>Globally cached lookups all draw from the same cache pool, allowing each process to have a fixed cache pool that can be used by cached lookups.</p>
-<p>Globally cached lookups can be specified as part of the <a href="/docs/latest/querying/lookups.html">cluster wide config for lookups</a> as a type of <code>cachedNamespace</code></p>
+<p>Globally cached lookups can be specified as part of the <a href="/docs/0.21.0/querying/lookups.html">cluster wide config for lookups</a> as a type of <code>cachedNamespace</code></p>
 <pre><code class="hljs css language-json">{
    <span class="hljs-attr">"type"</span>: <span class="hljs-string">"cachedNamespace"</span>,
    <span class="hljs-attr">"extractionNamespace"</span>: {
@@ -99,9 +99,9 @@ and are small enough to reasonably populate in-memory. This usually means tens t
       <span class="hljs-attr">"namespaceParseSpec"</span>: {
         <span class="hljs-attr">"format"</span>: <span class="hljs-string">"csv"</span>,
         <span class="hljs-attr">"columns"</span>: [
-          <span class="hljs-string">"key"</span>,
-          <span class="hljs-string">"value"</span>
-        ]
+            <span class="hljs-string">"[\"key\""</span>,
+            <span class="hljs-string">"\"value\"]"</span>
+     ]
       },
       <span class="hljs-attr">"pollPeriod"</span>: <span class="hljs-string">"PT5M"</span>
     },
@@ -135,14 +135,14 @@ and are small enough to reasonably populate in-memory. This usually means tens t
 <tbody>
 <tr><td><code>extractionNamespace</code></td><td>Specifies how to populate the local cache. See below</td><td>Yes</td><td>-</td></tr>
 <tr><td><code>firstCacheTimeout</code></td><td>How long to wait (in ms) for the first run of the cache to populate. 0 indicates to not wait</td><td>No</td><td><code>0</code> (do not wait)</td></tr>
-<tr><td><code>injective</code></td><td>If the underlying map is <a href="../../querying/lookups.html#query-execution">injective</a> (keys and values are unique) then optimizations can occur internally by setting this to <code>true</code></td><td>No</td><td><code>false</code></td></tr>
+<tr><td><code>injective</code></td><td>If the underlying map is <a href="/docs/0.21.0/querying/lookups.html#query-execution">injective</a> (keys and values are unique) then optimizations can occur internally by setting this to <code>true</code></td><td>No</td><td><code>false</code></td></tr>
 </tbody>
 </table>
 <p>If <code>firstCacheTimeout</code> is set to a non-zero value, it should be less than <code>druid.manager.lookups.hostUpdateTimeout</code>. If <code>firstCacheTimeout</code> is NOT set, then management is essentially asynchronous and does not know if a lookup succeeded or failed in starting. In such a case logs from the processes using lookups should be monitored for repeated failures.</p>
 <p>Proper functionality of globally cached lookups requires the following extension to be loaded on the Broker, Peon, and Historical processes:
 <code>druid-lookups-cached-global</code></p>
 <h2><a class="anchor" aria-hidden="true" id="example-configuration"></a><a href="#example-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2 [...]
-<p>In a simple case where only one <a href="../../querying/lookups.html#dynamic-configuration">tier</a> exists (<code>realtime_customer2</code>) with one <code>cachedNamespace</code> lookup called <code>country_code</code>, the resulting configuration JSON looks similar to the following:</p>
+<p>In a simple case where only one <a href="/docs/0.21.0/querying/lookups.html#dynamic-configuration">tier</a> exists (<code>realtime_customer2</code>) with one <code>cachedNamespace</code> lookup called <code>country_code</code>, the resulting configuration JSON looks similar to the following:</p>
 <pre><code class="hljs css language-json">{
   <span class="hljs-attr">"realtime_customer2"</span>: {
     <span class="hljs-attr">"country_code"</span>: {
@@ -212,7 +212,7 @@ a <code>pollPeriod</code> at the end of which time they poll the remote resource
 So if total number of entries in the <code>cachedNamespace</code> is in excess of the buffer's configured capacity, the extra will be kept in memory as page cache, and paged in and out by general OS tunings.
 It's highly recommended that <code>druid.lookup.namespace.numBufferedEntries</code> is set when using <code>offHeap</code>, the value should be chosen from the range between 10% and 50% of the number of entries in the lookup.</p>
 <h2><a class="anchor" aria-hidden="true" id="supported-lookups"></a><a href="#supported-lookups" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2- [...]
-<p>For additional lookups, please see our <a href="/docs/latest/development/extensions.html">extensions list</a>.</p>
+<p>For additional lookups, please see our <a href="/docs/0.21.0/development/extensions.html">extensions list</a>.</p>
 <h3><a class="anchor" aria-hidden="true" id="uri-lookup"></a><a href="#uri-lookup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1 [...]
 <p>The remapping values for each globally cached lookup can be specified by a JSON object as per the following examples:</p>
 <pre><code class="hljs css language-json">{
@@ -220,7 +220,10 @@ It's highly recommended that <code>druid.lookup.namespace.numBufferedEntries</co
   <span class="hljs-attr">"uri"</span>: <span class="hljs-string">"s3://bucket/some/key/prefix/renames-0003.gz"</span>,
   <span class="hljs-attr">"namespaceParseSpec"</span>:{
     <span class="hljs-attr">"format"</span>:<span class="hljs-string">"csv"</span>,
-    <span class="hljs-attr">"columns"</span>:[<span class="hljs-string">"key"</span>,<span class="hljs-string">"value"</span>]
+    <span class="hljs-attr">"columns"</span>:[
+        <span class="hljs-string">"[\"key\""</span>,
+        <span class="hljs-string">"\"value\"]"</span>
+      ]
   },
   <span class="hljs-attr">"pollPeriod"</span>:<span class="hljs-string">"PT5M"</span>
 }
@@ -231,7 +234,10 @@ It's highly recommended that <code>druid.lookup.namespace.numBufferedEntries</co
   <span class="hljs-attr">"fileRegex"</span>:<span class="hljs-string">"renames-[0-9]*\\.gz"</span>,
   <span class="hljs-attr">"namespaceParseSpec"</span>:{
     <span class="hljs-attr">"format"</span>:<span class="hljs-string">"csv"</span>,
-    <span class="hljs-attr">"columns"</span>:[<span class="hljs-string">"key"</span>,<span class="hljs-string">"value"</span>]
+    <span class="hljs-attr">"columns"</span>:[
+        <span class="hljs-string">"[\"key\""</span>,
+        <span class="hljs-string">"\"value\"]"</span>
+      ]
   },
   <span class="hljs-attr">"pollPeriod"</span>:<span class="hljs-string">"PT5M"</span>
 }
@@ -356,8 +362,7 @@ will not be included in the lookup.</p>
 <tr><th>Parameter</th><th>Description</th><th>Required</th><th>Default</th></tr>
 </thead>
 <tbody>
-<tr><td><code>namespace</code></td><td>The namespace to define</td><td>Yes</td><td></td></tr>
-<tr><td><code>connectorConfig</code></td><td>The connector config to use. You can set <code>connectURI</code>, <code>user</code> and <code>password</code>. You can selectively allow JDBC properties in <code>connectURI</code>. See <a href="/docs/latest/configuration/index.html#jdbc-connections-to-external-databases">JDBC connections security config</a> for more details.</td><td>Yes</td><td></td></tr>
+<tr><td><code>connectorConfig</code></td><td>The connector config to use. You can set <code>connectURI</code>, <code>user</code> and <code>password</code>. You can selectively allow JDBC properties in <code>connectURI</code>. See <a href="/docs/0.21.0/configuration/index.html#jdbc-connections-to-external-databases">JDBC connections security config</a> for more details.</td><td>Yes</td><td></td></tr>
 <tr><td><code>table</code></td><td>The table which contains the key value pairs</td><td>Yes</td><td></td></tr>
 <tr><td><code>keyColumn</code></td><td>The column in <code>table</code> which contains the keys</td><td>Yes</td><td></td></tr>
 <tr><td><code>valueColumn</code></td><td>The column in <code>table</code> which contains the values</td><td>Yes</td><td></td></tr>
@@ -389,7 +394,7 @@ Copy or symlink the downloaded file to <code>extensions/druid-lookups-cached-glo
 </blockquote>
 <h2><a class="anchor" aria-hidden="true" id="introspection"></a><a href="#introspection" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
 <p>Globally cached lookups have introspection points at <code>/keys</code> and <code>/values</code> which return a complete set of the keys and values (respectively) in the lookup. Introspection to <code>/</code> returns the entire map. Introspection to <code>/version</code> returns the version indicator for the lookup.</p>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-core/kafka-extraction-namespace.html"><span class="arrow-prev">← </span><span>Apache Kafka Lookups</span></a><a class="docs-next button" href="/docs/latest/development/extensions-core/mysql.html"><span class="function-name-prevnext">MySQL Metadata Store</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><l [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/kafka-extraction-namespace.html"><span class="arrow-prev">← </span><span>Apache Kafka Lookups</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/mysql.html"><span class="function-name-prevnext">MySQL Metadata Store</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><l [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -406,6 +411,6 @@ Copy or symlink the downloaded file to <code>extensions/druid-lookups-cached-glo
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/mysql.html b/docs/0.21.0/development/extensions-core/mysql.html
similarity index 60%
copy from docs/latest/development/extensions-core/mysql.html
copy to docs/0.21.0/development/extensions-core/mysql.html
index 9e8341b..2075dbb 100644
--- a/docs/latest/development/extensions-core/mysql.html
+++ b/docs/0.21.0/development/extensions-core/mysql.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>MySQL Metadata Store · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/mysql.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" cont [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>MySQL Metadata Store · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/mysql.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" cont [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,7 +77,7 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>To use this Apache Druid extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>mysql-metadata-storage</code> as an extension.</p>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>mysql-metadata-storage</code> as an extension.</p>
 <blockquote>
 <p>The MySQL extension requires the MySQL Connector/J library which is not included in the Druid distribution.
 Refer to the following section for instructions on how to install this library.</p>
@@ -142,17 +142,17 @@ with the location (host name and port) of the database.</p>
 <tr><td><code>druid.metadata.mysql.ssl.useSSL</code></td><td>Enable SSL</td><td><code>false</code></td><td>no</td></tr>
 <tr><td><code>druid.metadata.mysql.ssl.clientCertificateKeyStoreUrl</code></td><td>The file path URL to the client certificate key store.</td><td>none</td><td>no</td></tr>
 <tr><td><code>druid.metadata.mysql.ssl.clientCertificateKeyStoreType</code></td><td>The type of the key store where the client certificate is stored.</td><td>none</td><td>no</td></tr>
-<tr><td><code>druid.metadata.mysql.ssl.clientCertificateKeyStorePassword</code></td><td>The <a href="/docs/latest/operations/password-provider.html">Password Provider</a> or String password for the client key store.</td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.metadata.mysql.ssl.clientCertificateKeyStorePassword</code></td><td>The <a href="/docs/0.21.0/operations/password-provider.html">Password Provider</a> or String password for the client key store.</td><td>none</td><td>no</td></tr>
 <tr><td><code>druid.metadata.mysql.ssl.verifyServerCertificate</code></td><td>Enables server certificate verification.</td><td>false</td><td>no</td></tr>
 <tr><td><code>druid.metadata.mysql.ssl.trustCertificateKeyStoreUrl</code></td><td>The file path to the trusted root certificate key store.</td><td>Default trust store provided by MySQL</td><td>yes if <code>verifyServerCertificate</code> is set to true and a custom trust store is used</td></tr>
 <tr><td><code>druid.metadata.mysql.ssl.trustCertificateKeyStoreType</code></td><td>The type of the key store where trusted root certificates are stored.</td><td>JKS</td><td>yes if <code>verifyServerCertificate</code> is set to true and keystore type is not JKS</td></tr>
-<tr><td><code>druid.metadata.mysql.ssl.trustCertificateKeyStorePassword</code></td><td>The <a href="/docs/latest/operations/password-provider.html">Password Provider</a> or String password for the trust store.</td><td>none</td><td>yes if <code>verifyServerCertificate</code> is set to true and password is not null</td></tr>
+<tr><td><code>druid.metadata.mysql.ssl.trustCertificateKeyStorePassword</code></td><td>The <a href="/docs/0.21.0/operations/password-provider.html">Password Provider</a> or String password for the trust store.</td><td>none</td><td>yes if <code>verifyServerCertificate</code> is set to true and password is not null</td></tr>
 <tr><td><code>druid.metadata.mysql.ssl.enabledSSLCipherSuites</code></td><td>Overrides the existing cipher suites with these cipher suites.</td><td>none</td><td>no</td></tr>
 <tr><td><code>druid.metadata.mysql.ssl.enabledTLSProtocols</code></td><td>Overrides the TLS protocols with these protocols.</td><td>none</td><td>no</td></tr>
 </tbody>
 </table>
 <h3><a class="anchor" aria-hidden="true" id="mysql-firehose"></a><a href="#mysql-firehose" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0- [...]
-<p>The MySQL extension provides an implementation of an <a href="/docs/latest/ingestion/native-batch.html#firehoses-deprecated">SqlFirehose</a> which can be used to ingest data into Druid from a MySQL database.</p>
+<p>The MySQL extension provides an implementation of an <a href="/docs/0.21.0/ingestion/native-batch.html#firehoses-deprecated">SqlFirehose</a> which can be used to ingest data into Druid from a MySQL database.</p>
 <pre><code class="hljs css language-json">{
   <span class="hljs-attr">"type"</span>: <span class="hljs-string">"index_parallel"</span>,
   <span class="hljs-attr">"spec"</span>: {
@@ -207,13 +207,13 @@ with the location (host name and port) of the database.</p>
         ]
       }
     },
-    <span class="hljs-attr">"tuningconfig"</span>: {
+    <span class="hljs-attr">"tuningConfig"</span>: {
       <span class="hljs-attr">"type"</span>: <span class="hljs-string">"index_parallel"</span>
     }
   }
 }
 </code></pre>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-core/lookups-cached-global.html"><span class="arrow-prev">← </span><span>Globally Cached Lookups</span></a><a class="docs-next button" href="/docs/latest/development/extensions-core/orc.html"><span>ORC Extension</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#installing-the-mysql-connector [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/lookups-cached-global.html"><span class="arrow-prev">← </span><span>Globally Cached Lookups</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/orc.html"><span>ORC Extension</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#installing-the-mysql-connector [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -230,6 +230,6 @@ with the location (host name and port) of the database.</p>
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/development/extensions-core/namespaced-lookup.html b/docs/0.21.0/development/extensions-core/namespaced-lookup.html
new file mode 100644
index 0000000..7986bfe
--- /dev/null
+++ b/docs/0.21.0/development/extensions-core/namespaced-lookup.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Redirecting...</title>
+<link rel="canonical" href="lookups-cached-global.html">
+<meta http-equiv="refresh" content="0; url=lookups-cached-global.html">
+<h1>Redirecting...</h1>
+<a href="lookups-cached-global.html">Click here if you are not redirected.</a>
+<script>location="lookups-cached-global.html"</script>
diff --git a/docs/latest/development/extensions-core/orc.html b/docs/0.21.0/development/extensions-core/orc.html
similarity index 50%
copy from docs/latest/development/extensions-core/orc.html
copy to docs/0.21.0/development/extensions-core/orc.html
index 7e1ba17..881d456 100644
--- a/docs/latest/development/extensions-core/orc.html
+++ b/docs/0.21.0/development/extensions-core/orc.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>ORC Extension · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/orc.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20 [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>ORC Extension · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/orc.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21 [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -79,10 +79,10 @@
   -->
 <h2><a class="anchor" aria-hidden="true" id="orc-extension"></a><a href="#orc-extension" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.8 [...]
 <p>This Apache Druid extension enables Druid to ingest and understand the Apache ORC data format.</p>
-<p>The extension provides the <a href="/docs/latest/ingestion/data-formats.html#orc">ORC input format</a> and the <a href="/docs/latest/ingestion/data-formats.html#orc-hadoop-parser">ORC Hadoop parser</a>
-for <a href="/docs/latest/ingestion/native-batch.html">native batch ingestion</a> and <a href="/docs/latest/ingestion/hadoop.html">Hadoop batch ingestion</a>, respectively.
+<p>The extension provides the <a href="/docs/0.21.0/ingestion/data-formats.html#orc">ORC input format</a> and the <a href="/docs/0.21.0/ingestion/data-formats.html#orc-hadoop-parser">ORC Hadoop parser</a>
+for <a href="/docs/0.21.0/ingestion/native-batch.html">native batch ingestion</a> and <a href="/docs/0.21.0/ingestion/hadoop.html">Hadoop batch ingestion</a>, respectively.
 Please see corresponding docs for details.</p>
-<p>To use this extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>druid-orc-extensions</code>.</p>
+<p>To use this extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-orc-extensions</code>.</p>
 <h3><a class="anchor" aria-hidden="true" id="migration-from-contrib-extension"></a><a href="#migration-from-contrib-extension" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13. [...]
 <p>This extension, first available in version 0.15.0, replaces the previous 'contrib' extension which was available until
 0.14.0-incubating. While this extension can index any data the 'contrib' extension could, the JSON spec for the
@@ -94,7 +94,7 @@ ingestion task is <em>incompatible</em>, and will need modified to work with the
 <li>The 'contrib' extension supported a <code>typeString</code> property, which provided the schema of the
 ORC file, of which was essentially required to have the types correct, but notably <em>not</em> the column names, which
 facilitated column renaming. In the 'core' extension, column renaming can be achieved with
-<a href="/docs/latest/ingestion/index.html#flattenspec"><code>flattenSpec</code></a>. For example, <code>&quot;typeString&quot;:&quot;struct&lt;time:string,name:string&gt;&quot;</code>
+<a href="/docs/0.21.0/ingestion/index.html#flattenspec"><code>flattenSpec</code></a>. For example, <code>&quot;typeString&quot;:&quot;struct&lt;time:string,name:string&gt;&quot;</code>
 with the actual schema <code>struct&lt;_col0:string,_col1:string&gt;</code>, to preserve Druid schema would need replaced with:</li>
 </ul>
 <pre><code class="hljs css language-json">"flattenSpec": {
@@ -116,7 +116,7 @@ with the actual schema <code>struct&lt;_col0:string,_col1:string&gt;</code>, to
 <ul>
 <li>The 'contrib' extension supported a <code>mapFieldNameFormat</code> property, which provided a way to specify a dimension to
 flatten <code>OrcMap</code> columns with primitive types. This functionality has also been replaced with
-<a href="/docs/latest/ingestion/index.html#flattenspec"><code>flattenSpec</code></a>. For example: <code>&quot;mapFieldNameFormat&quot;: &quot;&lt;PARENT&gt;_&lt;CHILD&gt;&quot;</code>
+<a href="/docs/0.21.0/ingestion/index.html#flattenspec"><code>flattenSpec</code></a>. For example: <code>&quot;mapFieldNameFormat&quot;: &quot;&lt;PARENT&gt;_&lt;CHILD&gt;&quot;</code>
 for a dimension <code>nestedData_dim1</code>, to preserve Druid schema could be replaced with</li>
 </ul>
 <pre><code class="hljs css language-json">"flattenSpec": {
@@ -130,7 +130,7 @@ for a dimension <code>nestedData_dim1</code>, to preserve Druid schema could be
  ...
 }
 </code></pre>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-core/mysql.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">MySQL Metadata Store</span></a><a class="docs-next button" href="/docs/latest/development/extensions-core/druid-pac4j.html"><span>Druid pac4j based Security extension</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings">< [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/mysql.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">MySQL Metadata Store</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/druid-pac4j.html"><span>Druid pac4j based Security extension</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings">< [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -147,6 +147,6 @@ for a dimension <code>nestedData_dim1</code>, to preserve Druid schema could be
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/0.21.0/development/extensions-core/parquet.html b/docs/0.21.0/development/extensions-core/parquet.html
new file mode 100644
index 0000000..37974f3
--- /dev/null
+++ b/docs/0.21.0/development/extensions-core/parquet.html
@@ -0,0 +1,108 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Apache Parquet Extension · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/parquet.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version [...]
+              window.dataLayer = window.dataLayer || [];
+              function gtag(){dataLayer.push(arguments); }
+              gtag('js', new Date());
+              gtag('config', 'UA-131010415-1');
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            var coll = document.getElementsByClassName('collapsible');
+            var checkActiveCategory = true;
+            for (var i = 0; i < coll.length; i++) {
+              var links = coll[i].nextElementSibling.getElementsByTagName('*');
+              if (checkActiveCategory){
+                for (var j = 0; j < links.length; j++) {
+                  if (links[j].classList.contains('navListItemActive')){
+                    coll[i].nextElementSibling.classList.toggle('hide');
+                    coll[i].childNodes[1].classList.toggle('rotate');
+                    checkActiveCategory = false;
+                    break;
+                  }
+                }
+              }
+
+              coll[i].addEventListener('click', function() {
+                var arrow = this.childNodes[1];
+                arrow.classList.toggle('rotate');
+                var content = this.nextElementSibling;
+                content.classList.toggle('hide');
+              });
+            }
+
+            document.addEventListener('DOMContentLoaded', function() {
+              createToggler('#navToggler', '#docsNav', 'docsSliderActive');
+              createToggler('#tocToggler', 'body', 'tocActive');
+
+              var headings = document.querySelector('.toc-headings');
+              headings && headings.addEventListener('click', function(event) {
+                var el = event.target;
+                while(el !== headings){
+                  if (el.tagName === 'A') {
+                    document.body.classList.remove('tocActive');
+                    break;
+                  } else{
+                    el = el.parentNode;
+                  }
+                }
+              }, false);
+
+              function createToggler(togglerSelector, targetSelector, className) {
+                var toggler = document.querySelector(togglerSelector);
+                var target = document.querySelector(targetSelector);
+
+                if (!toggler) {
+                  return;
+                }
+
+                toggler.onclick = function(event) {
+                  event.preventDefault();
+
+                  target.classList.toggle(className);
+                };
+              }
+            });
+        </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/development/extensions-core/parquet.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Apache Parquet Extension</h1></header><article><div><span><!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<p>This Apache Druid module extends <a href="/docs/0.21.0/ingestion/hadoop.html">Druid Hadoop based indexing</a> to ingest data directly from offline
+Apache Parquet files.</p>
+<p>Note: If using the <code>parquet-avro</code> parser for Apache Hadoop based indexing, <code>druid-parquet-extensions</code> depends on the <code>druid-avro-extensions</code> module, so be sure to
+<a href="/docs/0.21.0/development/extensions.html#loading-extensions">include  both</a>.</p>
+<p>The <code>druid-parquet-extensions</code> provides the <a href="/docs/0.21.0/ingestion/data-formats.html#parquet">Parquet input format</a>, the <a href="/docs/0.21.0/ingestion/data-formats.html#parquet-hadoop-parser">Parquet Hadoop parser</a>,
+and the <a href="/docs/0.21.0/ingestion/data-formats.html#parquet-avro-hadoop-parser">Parquet Avro Hadoop Parser</a> with <code>druid-avro-extensions</code>.
+The Parquet input format is available for <a href="/docs/0.21.0/ingestion/native-batch.html">native batch ingestion</a>
+and the other 2 parsers are for <a href="/docs/0.21.0/ingestion/hadoop.html">Hadoop batch ingestion</a>.
+Please see corresponding docs for details.</p>
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/druid-pac4j.html"><span class="arrow-prev">← </span><span>Druid pac4j based Security extension</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/postgresql.html"><span class="function-name-prevnext">PostgreSQL Metadata Store</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><foo [...]
+                document.addEventListener('keyup', function(e) {
+                  if (e.target !== document.body) {
+                    return;
+                  }
+                  // keyCode for '/' (slash)
+                  if (e.keyCode === 191) {
+                    const search = document.getElementById('search_input_react');
+                    search && search.focus();
+                  }
+                });
+              </script><script>
+              var search = docsearch({
+                
+                apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
+                indexName: 'apache_druid',
+                inputSelector: '#search_input_react',
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
+              });
+            </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/postgresql.html b/docs/0.21.0/development/extensions-core/postgresql.html
similarity index 56%
copy from docs/latest/development/extensions-core/postgresql.html
copy to docs/0.21.0/development/extensions-core/postgresql.html
index 3cd04fc..9887a20 100644
--- a/docs/latest/development/extensions-core/postgresql.html
+++ b/docs/0.21.0/development/extensions-core/postgresql.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>PostgreSQL Metadata Store · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/postgresql.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:ver [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>PostgreSQL Metadata Store · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/postgresql.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:ver [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,7 +77,7 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>To use this Apache Druid extension, make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>postgresql-metadata-storage</code> as an extension.</p>
+<p>To use this Apache Druid extension, make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>postgresql-metadata-storage</code> as an extension.</p>
 <h2><a class="anchor" aria-hidden="true" id="setting-up-postgresql"></a><a href="#setting-up-postgresql" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2 [...]
 <ol>
 <li>Install PostgreSQL</li>
@@ -120,7 +120,7 @@ with the location (host name and port) of the database.</p>
 </thead>
 <tbody>
 <tr><td><code>druid.metadata.postgres.ssl.useSSL</code></td><td>Enables SSL</td><td><code>false</code></td><td>no</td></tr>
-<tr><td><code>druid.metadata.postgres.ssl.sslPassword</code></td><td>The <a href="/docs/latest/operations/password-provider.html">Password Provider</a> or String password for the client's key.</td><td>none</td><td>no</td></tr>
+<tr><td><code>druid.metadata.postgres.ssl.sslPassword</code></td><td>The <a href="/docs/0.21.0/operations/password-provider.html">Password Provider</a> or String password for the client's key.</td><td>none</td><td>no</td></tr>
 <tr><td><code>druid.metadata.postgres.ssl.sslFactory</code></td><td>The class name to use as the <code>SSLSocketFactory</code></td><td>none</td><td>no</td></tr>
 <tr><td><code>druid.metadata.postgres.ssl.sslFactoryArg</code></td><td>An optional argument passed to the sslFactory's constructor</td><td>none</td><td>no</td></tr>
 <tr><td><code>druid.metadata.postgres.ssl.sslMode</code></td><td>The sslMode. Possible values are &quot;disable&quot;, &quot;require&quot;, &quot;verify-ca&quot;, &quot;verify-full&quot;, &quot;allow&quot; and &quot;prefer&quot;</td><td>none</td><td>no</td></tr>
@@ -133,7 +133,7 @@ with the location (host name and port) of the database.</p>
 </tbody>
 </table>
 <h3><a class="anchor" aria-hidden="true" id="postgresql-firehose"></a><a href="#postgresql-firehose" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.2 [...]
-<p>The PostgreSQL extension provides an implementation of an <a href="/docs/latest/ingestion/native-batch.html#firehoses-deprecated">SqlFirehose</a> which can be used to ingest data into Druid from a PostgreSQL database.</p>
+<p>The PostgreSQL extension provides an implementation of an <a href="/docs/0.21.0/ingestion/native-batch.html#firehoses-deprecated">SqlFirehose</a> which can be used to ingest data into Druid from a PostgreSQL database.</p>
 <pre><code class="hljs css language-json">{
   <span class="hljs-attr">"type"</span>: <span class="hljs-string">"index_parallel"</span>,
   <span class="hljs-attr">"spec"</span>: {
@@ -188,13 +188,13 @@ with the location (host name and port) of the database.</p>
         ]
       }
     },
-    <span class="hljs-attr">"tuningconfig"</span>: {
+    <span class="hljs-attr">"tuningConfig"</span>: {
       <span class="hljs-attr">"type"</span>: <span class="hljs-string">"index_parallel"</span>
     }
   }
 }
 </code></pre>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-core/parquet.html"><span class="arrow-prev">← </span><span>Apache Parquet Extension</span></a><a class="docs-next button" href="/docs/latest/development/extensions-core/protobuf.html"><span>Protobuf</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#setting-up-postgresql">Setting up PostgreSQ [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/parquet.html"><span class="arrow-prev">← </span><span>Apache Parquet Extension</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/protobuf.html"><span>Protobuf</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#setting-up-postgresql">Setting up PostgreSQ [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -211,6 +211,6 @@ with the location (host name and port) of the database.</p>
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/protobuf.html b/docs/0.21.0/development/extensions-core/protobuf.html
similarity index 63%
copy from docs/latest/development/extensions-core/protobuf.html
copy to docs/0.21.0/development/extensions-core/protobuf.html
index a492ad3..8cee3b5 100644
--- a/docs/latest/development/extensions-core/protobuf.html
+++ b/docs/0.21.0/development/extensions-core/protobuf.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Protobuf · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/protobuf.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20 [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Protobuf · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/protobuf.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21 [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
@@ -77,11 +77,11 @@
   ~ specific language governing permissions and limitations
   ~ under the License.
   -->
-<p>This Apache Druid extension enables Druid to ingest and understand the Protobuf data format. Make sure to <a href="/docs/latest/development/extensions.html#loading-extensions">include</a> <code>druid-protobuf-extensions</code> as an extension.</p>
-<p>The <code>druid-protobuf-extensions</code> provides the <a href="/docs/latest/ingestion/data-formats.html#protobuf-parser">Protobuf Parser</a>
-for <a href="/docs/latest/ingestion/index.html#streaming">stream ingestion</a>. See corresponding docs for details.</p>
+<p>This Apache Druid extension enables Druid to ingest and understand the Protobuf data format. Make sure to <a href="/docs/0.21.0/development/extensions.html#loading-extensions">include</a> <code>druid-protobuf-extensions</code> as an extension.</p>
+<p>The <code>druid-protobuf-extensions</code> provides the <a href="/docs/0.21.0/ingestion/data-formats.html#protobuf-parser">Protobuf Parser</a>
+for <a href="/docs/0.21.0/ingestion/index.html#streaming">stream ingestion</a>. See corresponding docs for details.</p>
 <h2><a class="anchor" aria-hidden="true" id="example-load-protobuf-messages-from-kafka"></a><a href="#example-load-protobuf-messages-from-kafka" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1  [...]
-<p>This example demonstrates how to load Protobuf messages from Kafka.  Please read the <a href="/docs/latest/tutorials/tutorial-kafka.html">Load from Kafka tutorial</a> first, and see <a href="/docs/latest/development/extensions-core/kafka-ingestion.html">Kafka Indexing Service</a> documentation for more details.</p>
+<p>This example demonstrates how to load Protobuf messages from Kafka.  Please read the <a href="/docs/0.21.0/tutorials/tutorial-kafka.html">Load from Kafka tutorial</a> first, and see <a href="/docs/0.21.0/development/extensions-core/kafka-ingestion.html">Kafka Indexing Service</a> documentation for more details.</p>
 <p>The files used in this example are found at <a href="https://github.com/apache/druid/tree/master/examples/quickstart/protobuf"><code>./examples/quickstart/protobuf</code> in your Druid directory</a>.</p>
 <p>For this example:</p>
 <ul>
@@ -248,7 +248,7 @@ topic = <span class="hljs-string">'metrics_pb'</span>
 
 producer.flush()
 </code></pre>
-</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/development/extensions-core/postgresql.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">PostgreSQL Metadata Store</span></a><a class="docs-next button" href="/docs/latest/development/extensions-core/s3.html"><span>S3-compatible</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#example-l [...]
+</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.21.0/development/extensions-core/postgresql.html"><span class="arrow-prev">← </span><span class="function-name-prevnext">PostgreSQL Metadata Store</span></a><a class="docs-next button" href="/docs/0.21.0/development/extensions-core/s3.html"><span>S3-compatible</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#example-l [...]
                 document.addEventListener('keyup', function(e) {
                   if (e.target !== document.body) {
                     return;
@@ -265,6 +265,6 @@ producer.flush()
                 apiKey: '2de99082a9f38e49dfaa059bbe4c901d',
                 indexName: 'apache_druid',
                 inputSelector: '#search_input_react',
-                algoliaOptions: {"facetFilters":["language:en","version:0.20.2"]}
+                algoliaOptions: {"facetFilters":["language:en","version:0.21.0"]}
               });
             </script></body></html>
\ No newline at end of file
diff --git a/docs/latest/development/extensions-core/s3.html b/docs/0.21.0/development/extensions-core/s3.html
similarity index 62%
copy from docs/latest/development/extensions-core/s3.html
copy to docs/0.21.0/development/extensions-core/s3.html
index 4ae0b92..0009700 100644
--- a/docs/latest/development/extensions-core/s3.html
+++ b/docs/0.21.0/development/extensions-core/s3.html
@@ -1,9 +1,9 @@
-<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>S3-compatible · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/latest/development/extensions-core/s3.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.20. [...]
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>S3-compatible · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.21.0/development/extensions-core/s3.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.21. [...]
               window.dataLayer = window.dataLayer || [];
               function gtag(){dataLayer.push(arguments); }
               gtag('js', new Date());
               gtag('config', 'UA-131010415-1');
-            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
+            </script><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"/><link rel="stylesheet" href="/css/code-block-buttons.css"/><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js"></script><script type="text/javascript" src="/js/code-block-buttons.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head>< [...]
             var coll = document.getElementsByClassName('collapsible');
             var checkActiveCategory = true;
             for (var i = 0; i < coll.length; i++) {
... 20009 lines suppressed ...

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