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Posted to commits@kylin.apache.org by li...@apache.org on 2016/02/17 14:48:55 UTC
svn commit: r1730835 [3/13] - in /kylin/site: ./ development/ docs/
docs/install/ docs2/ docs2/gettingstarted/ docs2/howto/ docs2/install/
docs2/tutorial/
Added: kylin/site/docs2/howto/howto_backup_metadata.html
URL: http://svn.apache.org/viewvc/kylin/site/docs2/howto/howto_backup_metadata.html?rev=1730835&view=auto
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--- kylin/site/docs2/howto/howto_backup_metadata.html (added)
+++ kylin/site/docs2/howto/howto_backup_metadata.html Wed Feb 17 13:48:54 2016
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+
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+ </ul>
+</div>
+
+ <div class="col-md-9 col-lg-9 col-xs-14 aside2">
+ <div id="container">
+ <div id="pjax">
+ <h1 class="post-title">How to Backup Metadata</h1>
+
+ <p>version: v1.0, since: v0.7.1</p>
+
+ <article class="post-content" >
+ <p>Kylin organizes all of its metadata (including cube descriptions and instances, projects, inverted index description and instances, jobs, tables and dictionaries) as a hierarchy file system. However, Kylin uses hbase to store it, rather than normal file system. If you check your kylin configuration file(kylin.properties) you will find such a line:</p>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">## The metadata store in hbase
+kylin.metadata.url=kylin_metadata@hbase</code></pre></div>
+
+<p>This indicates that the metadata will be saved as a htable called <code class="highlighter-rouge">kylin_metadata</code>. You can scan the htable in hbase shell to check it out.</p>
+
+<h2 id="backup-metadata-store-with-binary-package">Backup Metadata Store with binary package</h2>
+
+<p>Sometimes you need to backup the Kylinâs Metadata Store from hbase to your disk file system.<br />
+In such cases, assuming youâre on the hadoop CLI(or sandbox) where you deployed Kylin, you can go to KYLIN_HOME and run :</p>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">./bin/metastore.sh backup</code></pre></div>
+
+<p>to dump your metadata to your local folder a folder under KYLIN_HOME/metadata_backps, the folder is named after current time with the syntax: KYLIN_HOME/meta_backups/meta_year_month_day_hour_minute_second</p>
+
+<h2 id="restore-metadata-store-with-binary-package">Restore Metadata Store with binary package</h2>
+
+<p>In case you find your metadata store messed up, and you want to restore to a previous backup:</p>
+
+<p>Firstly, reset the metadata store (this will clean everything of the Kylin metadata store in hbase, make sure to backup):</p>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">./bin/metastore.sh reset</code></pre></div>
+
+<p>Then upload the backup metadata to Kylinâs metadata store:</p>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">./bin/metastore.sh restore $KYLIN_HOME/meta_backups/meta_xxxx_xx_xx_xx_xx_xx</code></pre></div>
+
+<h2 id="backuprestore-metadata-in-development-env-available-since-073">Backup/restore metadata in development env (available since 0.7.3)</h2>
+
+<p>When developing/debugging Kylin, typically you have a dev machine with an IDE, and a backend sandbox. Usually youâll write code and run test cases at dev machine. It would be troublesome if you always have to put a binary package in the sandbox to check the metadata. There is a helper class called SandboxMetastoreCLI to help you download/upload metadata locally at your dev machine. Follow the Usage information and run it in your IDE.</p>
+
+<h2 id="cleanup-unused-resources-from-metadata-store-available-since-073">Cleanup unused resources from Metadata Store (available since 0.7.3)</h2>
+<p>As time goes on, some resources like dictionary, table snapshots became useless (as the cube segment be dropped or merged), but they still take space there; You can run command to find and cleanup them from metadata store:</p>
+
+<p>Firstly, run a check, this is safe as it will not change anything:</p>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">./bin/metastore.sh clean</code></pre></div>
+
+<p>The resources that will be dropped will be listed;</p>
+
+<p>Next, add the ââdelete trueâ parameter to cleanup those resources; before this, make sure you have made a backup of the metadata store;</p>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">./bin/metastore.sh clean --delete true</code></pre></div>
+
+
+ </article>
+ </div>
+ </div>
+ </div>
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+ </div>
+ <!--
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+ </div>
+</div>
+
+ <li><a href="#titleHow To" data-toggle="collapse" id="navtitle">How To</a></li>
+ <div class="collapse in">
+ <div class="list-group" id="list1">
+ <ul style="list-style-type:disc">
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+
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+ <ul>
+ </div>
+</div>
+
+
+ </ul>
+</div>
+
+ <div class="col-md-9 col-lg-9 col-xs-14 aside2">
+ <div id="container">
+ <div id="pjax">
+ <h1 class="post-title">How to Build Cube with Restful API</h1>
+
+ <p>version: v1.2, since: v0.7.1</p>
+
+ <article class="post-content" >
+ <h3 id="authentication">1. Authentication</h3>
+<ul>
+ <li>Currently, Kylin uses <a href="http://en.wikipedia.org/wiki/Basic_access_authentication">basic authentication</a>.</li>
+ <li>Add <code class="highlighter-rouge">Authorization</code> header to first request for authentication</li>
+ <li>Or you can do a specific request by <code class="highlighter-rouge">POST http://localhost:7070/kylin/api/user/authentication</code></li>
+ <li>Once authenticated, client can go subsequent requests with cookies.</li>
+</ul>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">POST http://localhost:7070/kylin/api/user/authentication
+
+Authorization:Basic xxxxJD124xxxGFxxxSDF
+Content-Type: application/json;charset=UTF-8</code></pre></div>
+
+<h3 id="get-details-of-cube">2. Get details of cube.</h3>
+<ul>
+ <li><code class="highlighter-rouge">GET http://localhost:7070/kylin/api/cubes?cubeName={cube_name}&limit=15&offset=0</code></li>
+ <li>Client can find cube segment date ranges in returned cube detail.</li>
+</ul>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">GET http://localhost:7070/kylin/api/cubes?cubeName=test_kylin_cube_with_slr&limit=15&offset=0
+
+Authorization:Basic xxxxJD124xxxGFxxxSDF
+Content-Type: application/json;charset=UTF-8</code></pre></div>
+
+<h3 id="then-submit-a-build-job-of-the-cube">3. Then submit a build job of the cube.</h3>
+<ul>
+ <li><code class="highlighter-rouge">PUT http://localhost:7070/kylin/api/cubes/{cube_name}/rebuild</code></li>
+ <li>For put request body detail please refer to <a href="howto_use_restapi.html#build-cube">Build Cube API</a>.
+ <ul>
+ <li><code class="highlighter-rouge">startTime</code> and <code class="highlighter-rouge">endTime</code> should be utc timestamp.</li>
+ <li><code class="highlighter-rouge">buildType</code> can be <code class="highlighter-rouge">BUILD</code> ,<code class="highlighter-rouge">MERGE</code> or <code class="highlighter-rouge">REFRESH</code>. <code class="highlighter-rouge">BUILD</code> is for building a new segment, <code class="highlighter-rouge">REFRESH</code> for refreshing an existing segment. <code class="highlighter-rouge">MERGE</code> is for merging multiple existing segments into one bigger segment.</li>
+ </ul>
+ </li>
+ <li>This method will return a new created job instance, whose uuid is the unique id of job to track job status.</li>
+</ul>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">PUT http://localhost:7070/kylin/api/cubes/test_kylin_cube_with_slr/rebuild
+
+Authorization:Basic xxxxJD124xxxGFxxxSDF
+Content-Type: application/json;charset=UTF-8
+
+{
+ "startTime": 0,
+ "endTime": 1388563200000,
+ "buildType": "BUILD"
+}</code></pre></div>
+
+<h3 id="track-job-status">4. Track job status.</h3>
+<ul>
+ <li><code class="highlighter-rouge">GET http://localhost:7070/kylin/api/jobs/{job_uuid}</code></li>
+ <li>Returned <code class="highlighter-rouge">job_status</code> represents current status of job.</li>
+</ul>
+
+<h3 id="if-the-job-got-errors-you-can-resume-it">5. If the job got errors, you can resume it.</h3>
+<ul>
+ <li><code class="highlighter-rouge">PUT http://localhost:7070/kylin/api/jobs/{job_uuid}/resume</code></li>
+</ul>
+
+ </article>
+ </div>
+ </div>
+ </div>
+ </div>
+ </div>
+ <!--
+* 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.
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@@ -0,0 +1,1732 @@
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+*
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+*
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+ <h1 class="post-title">How to Cleanup Storage (HDFS & HBase Tables)</h1>
+
+ <p>version: v0.7.2, since: v0.7.1</p>
+
+ <article class="post-content" >
+ <p>Kylin will generate intermediate files in HDFS during the cube building; Besides, when purge/drop/merge cubes, some HBase tables may be left in HBase and will no longer be queried; Although Kylin has started to do some <br />
+automated garbage collection, it might not cover all cases; You can do an offline storage cleanup periodically:</p>
+
+<p>Steps:<br />
+1. Check which resources can be cleanup, this will not remove anything:</p>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">hbase org.apache.hadoop.util.RunJar ${KYLIN_HOME}/lib/kylin-job-(version).jar org.apache.kylin.job.hadoop.cube.StorageCleanupJob --delete false</code></pre></div>
+
+<p>Here please replace (version) with the specific Kylin jar version in your installation;<br />
+2. You can pickup 1 or 2 resources to check whether theyâre no longer be referred; Then add the ââdelete trueâ option to start the cleanup:</p>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">hbase org.apache.hadoop.util.RunJar ${KYLIN_HOME}/lib/kylin-job-(version).jar org.apache.kylin.job.hadoop.cube.StorageCleanupJob --delete true</code></pre></div>
+
+<p>On finish, the intermediate HDFS location and HTables will be dropped;</p>
+
+ </article>
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