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Posted to commits@kylin.apache.org by lu...@apache.org on 2015/10/08 13:18:13 UTC
svn commit: r1707496 - in /incubator/kylin/site: blog/2015/09/25/
blog/2015/09/25/hybrid-model/ blog/2015/09/25/hybrid-model/index.html
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Author: lukehan
Date: Thu Oct 8 11:18:13 2015
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+ <title>Apache Kylin | Hybrid Model in Apache Kylin 1.0</title>
+ <meta name="description" content="Apache Kylin v1.0 introduces a new realization âhybrid modelâ (also called âdynamic modelâ); This post introduces the concept and how to create a hybrid inst...">
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+
+ <header class="post-header">
+ <h1 class="post-title">Hybrid Model in Apache Kylin 1.0</h1>
+ <p class="post-meta" >Sep 25, 2015 ⢠Shaofeng Shi</p>
+ </header>
+
+ <article class="post-content" >
+ <p><strong>Apache Kylin v1.0 introduces a new realization âhybrid modelâ (also called âdynamic modelâ); This post introduces the concept and how to create a hybrid instance.</strong></p>
+
+<h1 id="problem">Problem</h1>
+
+<p>For incoming SQL queries, Kylin picks one (and only one) realization to serve the query; Before the âhybridâ, there is only one type of realization open for user: Cube. That to say, only 1 Cube would be selected to answer a query;</p>
+
+<p>Now letâs start with a sample case; Assume user has a Cube called âCube_V1â, it has been built for a couple of months; Now the user wants to add new dimension or metrics to fulfill their business need; So he created a new Cube named âCube_V2â;</p>
+
+<p>Due to some reason user wants to keep âCube_V1â, and expects to build âCube_V2â from the end date of âCube_V1â; Possible reasons include:</p>
+
+<ul>
+ <li>History source data has been dropped from Hadoop, not possible to build âCube_V2â from the very beginning;</li>
+ <li>The cube is large, rebuilding takes very long time;</li>
+ <li>New dimension/metrics is only available or applied since some day;</li>
+ <li>User feels okay that the result is empty for old days when the query uses new dimensions/metrics.</li>
+</ul>
+
+<p>For the queries against the common dimensions/metrics, user expects both âCube_V1â and âCube_V2â be scanned to get a full result set; Under such a background, the âhybrid modelâ is introduced to solve this problem.</p>
+
+<h2 id="hybrid-model">Hybrid Model</h2>
+
+<p>Hybrid model is a new realization which is a composite of one or multiple other realizations (cubes); See the figure below.</p>
+
+<p><img src="/images/blog/hybrid-model.png" alt="" /></p>
+
+<p>Hybrid doesnât have its real storage; It is like a virtual database view over the tables; A hybrid instance acts as a delegator who forward the requests to its children realizations and then union the results when gets back from them.</p>
+
+<h2 id="how-to-add-a-hybrid-instance">How to add a hybrid instance</h2>
+
+<p>So far there is no UI for creating/editing hybrid; if have the need, you need manually edit Kylin metadata;</p>
+
+<h3 id="step-1-take-a-backup-of-kylin-metadata-store">Step 1: Take a backup of kylin metadata store</h3>
+
+<div class="highlighter-rouge"><pre class="highlight"><code>export KYLIN_HOME="/path/to/kylin"
+
+$KYLIN_HOME/bin/metastore.sh backup
+
+</code></pre>
+</div>
+
+<p>A backup folder will be created, assume it is $KYLIN_HOME/metadata_backup/2015-09-25/</p>
+
+<h3 id="step-2-create-sub-folder-hybrid">Step 2: Create sub-folder âhybridâ</h3>
+
+<div class="highlighter-rouge"><pre class="highlight"><code>mkdir -p $KYLIN_HOME/metadata_backup/2015-09-25/hybrid
+</code></pre>
+</div>
+
+<h3 id="step-3-create-a-hybrid-instance-json-file">Step 3: Create a hybrid instance json file:</h3>
+
+<div class="highlighter-rouge"><pre class="highlight"><code>vi $KYLIN_HOME/metadata_backup/2015-09-25/hybrid/my_hybrid.json
+
+</code></pre>
+</div>
+
+<p>Input content like below, the ânameâ and âuuidâ need be unique:</p>
+
+<div class="highlighter-rouge"><pre class="highlight"><code><span class="p">{</span><span class="w">
+ </span><span class="nt">"uuid"</span><span class="p">:</span><span class="w"> </span><span class="s2">"9iiu8590-64b6-4367-8fb5-7500eb95fd9c"</span><span class="p">,</span><span class="w">
+ </span><span class="nt">"name"</span><span class="p">:</span><span class="w"> </span><span class="s2">"my_hybrid"</span><span class="p">,</span><span class="w">
+ </span><span class="nt">"realizations"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w">
+ </span><span class="p">{</span><span class="w">
+ </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"CUBE"</span><span class="p">,</span><span class="w">
+ </span><span class="nt">"realization"</span><span class="p">:</span><span class="w"> </span><span class="s2">"Cube_V1"</span><span class="w">
+ </span><span class="p">},</span><span class="w">
+ </span><span class="p">{</span><span class="w">
+ </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"CUBE"</span><span class="p">,</span><span class="w">
+ </span><span class="nt">"realization"</span><span class="p">:</span><span class="w"> </span><span class="s2">"Cube_V2"</span><span class="w">
+ </span><span class="p">}</span><span class="w">
+ </span><span class="p">]</span><span class="w">
+</span><span class="p">}</span><span class="w">
+
+</span></code></pre>
+</div>
+<p>Here âCube_V1â and âCube_V2â are the cubes that you want to combine.</p>
+
+<h3 id="step-4-add-hybrid-instance-to-project">Step 4: Add hybrid instance to project</h3>
+
+<p>Open project json file (for example project âdefaultâ) with text editor:</p>
+
+<div class="highlighter-rouge"><pre class="highlight"><code>vi $KYLIN_HOME/metadata_backup/2015-09-25/project/default.json
+
+</code></pre>
+</div>
+
+<p>In the ârealizationsâ array, add one entry like below, the type need be âHYBRIDâ, ârealizationâ is the name of the hybrid instance:</p>
+
+<div class="highlighter-rouge"><pre class="highlight"><code><span class="w"> </span><span class="p">{</span><span class="w">
+ </span><span class="nt">"name"</span><span class="p">:</span><span class="w"> </span><span class="s2">"my_hybrid"</span><span class="p">,</span><span class="w">
+ </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"HYBRID"</span><span class="p">,</span><span class="w">
+ </span><span class="nt">"realization"</span><span class="p">:</span><span class="w"> </span><span class="s2">"my_hybrid"</span><span class="w">
+ </span><span class="p">}</span><span class="w">
+</span></code></pre>
+</div>
+
+<h3 id="step-5-upload-the-metadata">Step 5: Upload the metadata:</h3>
+
+<div class="highlighter-rouge"><pre class="highlight"><code> $KYLIN_HOME/bin/metastore.sh restore $KYLIN_HOME/metadata_backup/2015-09-25/
+
+</code></pre>
+</div>
+<p>Please note, the ârestoreâ action will upload the metadata from local to remote hbase store, which may overwrite the changes in remote; So please do this when there is no metadata change from Kylin server during this period (no building job, no cube creation/update, etc), or only pickup the changed files to an empty local folder before run ârestoreâ;</p>
+
+<h3 id="step-6-reload-metadata">Step 6: Reload metadata</h3>
+
+<p>Restart Kylin server, or click âReload metadataâ in the âAdminâ tab on Kylin web UI to load the changes; Ideally the hybrid will start to work; You can do some verifications by writing some SQLs.</p>
+
+<h2 id="faq">FAQï¼</h2>
+
+<p><strong>Question 1</strong>: When will hybrid be selected to answer a SQL query?<br />
+If one of its underlying cube can answer the query, the hybrid will be selected;</p>
+
+<p><strong>Question 2</strong>: How hybrid to answer the query?<br />
+Hybrid will delegate the query to each of its children realizations; If a child cube is capable for this query (match all dimensions/metrics), it will return the results to the hybrid, otherwise it will be skipped; Finally query engine will aggregate the data from hybrid before return to user;</p>
+
+<p><strong>Question 3</strong>: Will hybrid check the date/time duplication?<br />
+No; it depends on user to ensure the cubes in a hybrid donât have date/time range duplication; For example, the âCube_V1â is ended at 2015-9-20 (excluding), the âCube_V2â should start from 2015-9-20 (including);</p>
+
+<p><strong>Question 4</strong>: Will hybrid restrict the children cubes having the same data model?<br />
+No; To provide as much as flexibility, hybrid doesnât check whether the children cubesâ fact/lookup tables and join conditions are the same; But user should understand what theyâre doing to avoid unexpected behavior.</p>
+
+<p><strong>Question 5</strong>: Can hybrid have another hybrid as child?<br />
+No; we donât see the need; so far it assumes all children are Cubes;</p>
+
+<p><strong>Question 6</strong>: Can I use hybrid to join multiple cubes?<br />
+No; the purpose of hybrid is to consolidate history cube and new cube, something like a âunionâ, not âjoinâ;</p>
+
+<p><strong>Question 7</strong>: If a child cube is disabled, will it be scanned via the hybrid?<br />
+No; hybrid instance will check the child realizationâs status before sending query to it; so if the cube is disabled, it will not be scanned.</p>
+
+ </article>
+
+</div>
+
+
+
+
+
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Added: incubator/kylin/site/community/poweredby.html
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--- incubator/kylin/site/community/poweredby.html (added)
+++ incubator/kylin/site/community/poweredby.html Thu Oct 8 11:18:13 2015
@@ -0,0 +1,240 @@
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+ <div id="logo" class="text-center"> <img class="img-circle" id="circlelogo" src="/assets/images/kylin_logo.jpg"> <span class="title" >Apache Kylin</span> <span class="tagline">Extreme OLAP Engine for Big Data</span>
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+
+ <div class="page-content">
+ <div class="wrapper">
+ <h2 id="powered-by-apache-kylin">Powered By Apache Kylin</h2>
+
+<p><strong>How to be listed here?</strong><br />
+<em>Send a quick description of your organization and usage to the <a href="mailto:user@kylin.incubator.apache.org">mailing list</a> or to <a href="https://twitter.com/apachekylin">@apachekylin</a> or <a href="https://twitter.com/lukehq">@lukehq</a> on twitter and weâll add you.</em></p>
+
+<p><strong>Companies</strong></p>
+
+<ul>
+ <li><a href="http://www.ebay.com">eBay</a>, Apache Kylin is used at eBay for Big Data Analytics on Hadoop. This powers various data products including Behavior Analytics, Traffic Reporting, Account Manager Application and Streaming Dashboard.</li>
+ <li><a href="http://www.jcloud.com">JCloud</a>, Apache Kylin is used as Data Analytics Engine to analyse JOS <a href="http://jos.jd.com/">http://jos.jd.com/</a> API access behavior and report.</li>
+ <li><a href="http://www.mininglamp.com/">MiningLAMP</a>, Kylin is part of MiningLAMPâs Big Data Analytics product offering OLAP capability</li>
+ <li><a href="http://www.meituan.com">Meituan</a></li>
+ <li></li>
+</ul>
+
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+
+ <!--
+* 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
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+ Apache Kylin is an effort undergoing incubation at The Apache Software Foundation (ASF), sponsored by the Apache Incubator. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF.
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