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+ + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_install_ranger_kylin_plugin.html" class="list-group-item-lay pjaxlink" id="navlist">The Ranger Kylin Plugin Installation Guide</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_enable_zookeeper_acl.html" class="list-group-item-lay pjaxlink" id="navlist">Enable zookeeper acl</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_setup_systemcube.html" class="list-group-item-lay pjaxlink" id="navlist">Set Up System Cube</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_use_cube_planner.html" class="list-group-item-lay pjaxlink" id="navlist">Use Cube Planner</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_use_dashboard.html" class="list-group-item-lay pjaxlink" id="navlist">Use Dashboard</a></li> + + + + + + + + + <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">Terminology</h1> + + + <article class="post-content" > + <p>Here are some domain terms we are using in Apache Kylin, please check them for your reference. <br /> +They are basic knowledge of Apache Kylin which also will help to well understand such concerpt, term, knowledge, theory and others about Data Warehouse, Business Intelligence for analycits.</p> + +<ul> + <li><strong>Data Warehouse</strong>: a data warehouse (DW or DWH), also known as an enterprise data warehouse (EDW), is a system used for reporting and data analysis, <a href="https://en.wikipedia.org/wiki/Data_warehouse";>wikipedia</a></li> + <li><strong>Business Intelligence</strong>: Business intelligence (BI) is the set of techniques and tools for the transformation of raw data into meaningful and useful information for business analysis purposes, <a href="https://en.wikipedia.org/wiki/Business_intelligence";>wikipedia</a></li> + <li><strong>OLAP</strong>: OLAP is an acronym for <a href="https://en.wikipedia.org/wiki/Online_analytical_processing";>online analytical processing</a></li> + <li><strong>OLAP Cube</strong>: an OLAP cube is an array of data understood in terms of its 0 or more dimensions, <a href="http://en.wikipedia.org/wiki/OLAP_cube";>wikipedia</a></li> + <li><strong>Star Schema</strong>: the star schema consists of one or more fact tables referencing any number of dimension tables, <a href="https://en.wikipedia.org/wiki/Star_schema";>wikipedia</a></li> + <li><strong>Fact Table</strong>: a Fact table consists of the measurements, metrics or facts of a business process, <a href="https://en.wikipedia.org/wiki/Fact_table";>wikipedia</a></li> + <li><strong>Lookup Table</strong>: a lookup table is an array that replaces runtime computation with a simpler array indexing operation, <a href="https://en.wikipedia.org/wiki/Lookup_table";>wikipedia</a></li> + <li><strong>Dimension</strong>: A dimension is a structure that categorizes facts and measures in order to enable users to answer business questions. Commonly used dimensions are people, products, place and time, <a href="https://en.wikipedia.org/wiki/Dimension_(data_warehouse)">wikipedia</a></li> + <li><strong>Measure</strong>: a measure is a property on which calculations (e.g., sum, count, average, minimum, maximum) can be made, <a href="https://en.wikipedia.org/wiki/Measure_(data_warehouse)">wikipedia</a></li> + <li><strong>Join</strong>: a SQL join clause combines records from two or more tables in a relational database, <a href="https://en.wikipedia.org/wiki/Join_(SQL)">wikipedia</a></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. +* See the License for the specific language governing permissions and +* limitations under the License. +--> + +<footer id="underfooter"> + <div class="container"> + <div class="row"> + <div class="col-md-12 widget"> + <div class="widget-body" style="text-align:center"> + <a href="http://www.apache.org";> + <img id="asf-logo" alt="Apache Software Foundation" src="/assets/images/feather-small.gif"> + </a> + + <div> + The contents of this website are © 2015 Apache Software Foundation under the terms of the <a + href="http://www.apache.org/licenses/LICENSE-2.0";> Apache License v2 </a>. Apache Kylin and + its logo are trademarks of the Apache Software Foundation. + </div> + + </div> + </div> + </div> + <!-- /row of widgets --> + + </div> + <div></div> + +</footer> + + <script src="/assets/js/jquery-1.9.1.min.js"></script> + <script src="/assets/js/bootstrap.min.js"></script> + <script src="/assets/js/main.js"></script> + </body> +</html>
Added: kylin/site/docs23/howto/howto_backup_metadata.html URL: http://svn.apache.org/viewvc/kylin/site/docs23/howto/howto_backup_metadata.html?rev=1822508&view=auto ============================================================================== --- kylin/site/docs23/howto/howto_backup_metadata.html (added) +++ kylin/site/docs23/howto/howto_backup_metadata.html Mon Jan 29 14:05:18 2018 @@ -0,0 +1,4178 @@ +<!-- +* 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. 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+ + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_install_ranger_kylin_plugin.html" class="list-group-item-lay pjaxlink" id="navlist">The Ranger Kylin Plugin Installation Guide</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_enable_zookeeper_acl.html" class="list-group-item-lay pjaxlink" id="navlist">Enable zookeeper acl</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_setup_systemcube.html" class="list-group-item-lay pjaxlink" id="navlist">Set Up System Cube</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_use_cube_planner.html" class="list-group-item-lay pjaxlink" id="navlist">Use Cube Planner</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + 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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> + </div> + </div> + <!-- +* Licensed to the Apache Software Foundation (ASF) under one +* or more contributor license agreements. 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