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7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Operations</span><meta itemprop="position" content="1"></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Misc</span><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Metadata Migration</span><meta itemprop="position" content="3"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Metadata Migration</h1></header><p>If you have been running an evaluation Druid cluster using the built-in Derby metadata storage and wish to migrate to a | |
| more production-capable metadata store such as MySQL or PostgreSQL, this document describes the necessary steps.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="shut-down-cluster-services">Shut down cluster services<a href="#shut-down-cluster-services" class="hash-link" aria-label="Direct link to Shut down cluster services" title="Direct link to Shut down cluster services"></a></h2><p>To ensure a clean migration, shut down the non-coordinator services to ensure that metadata state will not | |
| change as you do the migration.</p><p>When migrating from Derby, the coordinator processes will still need to be up initially, as they host the Derby database.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="exporting-metadata">Exporting metadata<a href="#exporting-metadata" class="hash-link" aria-label="Direct link to Exporting metadata" title="Direct link to Exporting metadata"></a></h2><p>Druid provides an <a href="/docs/latest/operations/export-metadata">Export Metadata Tool</a> for exporting metadata from Derby into CSV files | |
| which can then be imported into your new metadata store.</p><p>The tool also provides options for rewriting the deep storage locations of segments; this is useful | |
| for <a href="/docs/latest/operations/deep-storage-migration">deep storage migration</a>.</p><p>Run the <code>export-metadata</code> tool on your existing cluster, and save the CSV files it generates. After a successful export, you can shut down the coordinator.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="initializing-the-new-metadata-store">Initializing the new metadata store<a href="#initializing-the-new-metadata-store" class="hash-link" aria-label="Direct link to Initializing the new metadata store" title="Direct link to Initializing the new metadata store"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="create-database">Create database<a href="#create-database" class="hash-link" aria-label="Direct link to Create database" title="Direct link to Create database"></a></h3><p>Before importing the existing cluster metadata, you will need to set up the new metadata store.</p><p>The <a href="/docs/latest/development/extensions-core/mysql">MySQL extension</a> and <a href="/docs/latest/development/extensions-core/postgresql">PostgreSQL extension</a> docs have instructions for initial database setup.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="update-configuration">Update configuration<a href="#update-configuration" class="hash-link" aria-label="Direct link to Update configuration" title="Direct link to Update configuration"></a></h3><p>Update your Druid runtime properties with the new metadata configuration.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="create-druid-tables">Create Druid tables<a href="#create-druid-tables" class="hash-link" aria-label="Direct link to Create Druid tables" title="Direct link to Create Druid tables"></a></h3><p>Druid provides a <code>metadata-init</code> tool for creating Druid's metadata tables. After initializing the Druid database, you can run the commands shown below from the root of the Druid package to initialize the tables.</p><p>In the example commands below:</p><ul><li><code>lib</code> is the Druid lib directory</li><li><code>extensions</code> is the Druid extensions directory</li><li><code>base</code> corresponds to the value of <code>druid.metadata.storage.tables.base</code> in the configuration, <code>druid</code> by default.</li><li>The <code>--connectURI</code> parameter corresponds to the value of <code>druid.metadata.storage.connector.connectURI</code>.</li><li>The <code>--user</code> parameter corresponds to the value of <code>druid.metadata.storage.connector.user</code>.</li><li>The <code>--password</code> parameter corresponds to the value of <code>druid.metadata.storage.connector.password</code>.</li></ul><h4 class="anchor anchorWithStickyNavbar_LWe7" id="mysql">MySQL<a href="#mysql" class="hash-link" aria-label="Direct link to MySQL" title="Direct link to MySQL"></a></h4><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token builtin class-name" style="color:rgb(255, 203, 107)">cd</span><span class="token plain"> </span><span class="token variable" style="color:rgb(191, 199, 213)">${DRUID_ROOT}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">java -classpath </span><span class="token string" style="color:rgb(195, 232, 141)">"lib/*"</span><span class="token plain"> -Dlog4j.configurationFile</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">conf/druid/cluster/_common/log4j2.xml -Ddruid.extensions.directory</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token string" style="color:rgb(195, 232, 141)">"extensions"</span><span class="token plain"> -Ddruid.extensions.loadList</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token string" style="color:rgb(195, 232, 141)">"[</span><span class="token string entity" style="color:rgb(195, 232, 141)">\"</span><span class="token string" style="color:rgb(195, 232, 141)">mysql-metadata-storage</span><span class="token string entity" style="color:rgb(195, 232, 141)">\"</span><span class="token string" style="color:rgb(195, 232, 141)">]"</span><span class="token plain"> -Ddruid.metadata.storage.type</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">mysql -Ddruid.node.type</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">metadata-init org.apache.druid.cli.Main tools metadata-init --connectURI</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token string" style="color:rgb(195, 232, 141)">"<mysql-uri>"</span><span class="token plain"> --user </span><span class="token operator" style="color:rgb(137, 221, 255)"><</span><span class="token plain">user</span><span class="token operator" style="color:rgb(137, 221, 255)">></span><span class="token plain"> --password </span><span class="token operator" style="color:rgb(137, 221, 255)"><</span><span class="token plain">pass</span><span class="token operator" style="color:rgb(137, 221, 255)">></span><span class="token plain"> --base druid</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h4 class="anchor anchorWithStickyNavbar_LWe7" id="postgresql">PostgreSQL<a href="#postgresql" class="hash-link" aria-label="Direct link to PostgreSQL" title="Direct link to PostgreSQL"></a></h4><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token builtin class-name" style="color:rgb(255, 203, 107)">cd</span><span class="token plain"> </span><span class="token variable" style="color:rgb(191, 199, 213)">${DRUID_ROOT}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">java -classpath </span><span class="token string" style="color:rgb(195, 232, 141)">"lib/*"</span><span class="token plain"> -Dlog4j.configurationFile</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">conf/druid/cluster/_common/log4j2.xml -Ddruid.extensions.directory</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token string" style="color:rgb(195, 232, 141)">"extensions"</span><span class="token plain"> -Ddruid.extensions.loadList</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token string" style="color:rgb(195, 232, 141)">"[</span><span class="token string entity" style="color:rgb(195, 232, 141)">\"</span><span class="token string" style="color:rgb(195, 232, 141)">postgresql-metadata-storage</span><span class="token string entity" style="color:rgb(195, 232, 141)">\"</span><span class="token string" style="color:rgb(195, 232, 141)">]"</span><span class="token plain"> -Ddruid.metadata.storage.type</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">postgresql -Ddruid.node.type</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">metadata-init org.apache.druid.cli.Main tools metadata-init --connectURI</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token string" style="color:rgb(195, 232, 141)">"<postgresql-uri>"</span><span class="token plain"> --user </span><span class="token operator" style="color:rgb(137, 221, 255)"><</span><span class="token plain">user</span><span class="token operator" style="color:rgb(137, 221, 255)">></span><span class="token plain"> --password </span><span class="token operator" style="color:rgb(137, 221, 255)"><</span><span class="token plain">pass</span><span class="token operator" style="color:rgb(137, 221, 255)">></span><span class="token plain"> --base druid</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="import-metadata">Import metadata<a href="#import-metadata" class="hash-link" aria-label="Direct link to Import metadata" title="Direct link to Import metadata"></a></h3><p>After initializing the tables, please refer to the <a href="/docs/latest/operations/export-metadata#importing-metadata">import commands</a> for your target database.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="restart-cluster">Restart cluster<a href="#restart-cluster" class="hash-link" aria-label="Direct link to Restart cluster" title="Direct link to Restart cluster"></a></h3><p>After importing the metadata successfully, you can now restart your cluster.</p></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/latest/operations/export-metadata"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Export Metadata Tool</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/latest/operations/use_sbt_to_build_fat_jar"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Content for build.sbt</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#shut-down-cluster-services" class="table-of-contents__link toc-highlight">Shut down cluster services</a></li><li><a href="#exporting-metadata" class="table-of-contents__link toc-highlight">Exporting metadata</a></li><li><a href="#initializing-the-new-metadata-store" class="table-of-contents__link toc-highlight">Initializing the new metadata store</a><ul><li><a href="#create-database" class="table-of-contents__link toc-highlight">Create database</a></li><li><a href="#update-configuration" class="table-of-contents__link toc-highlight">Update configuration</a></li><li><a href="#create-druid-tables" class="table-of-contents__link toc-highlight">Create Druid tables</a></li><li><a href="#import-metadata" class="table-of-contents__link toc-highlight">Import metadata</a></li><li><a href="#restart-cluster" class="table-of-contents__link toc-highlight">Restart cluster</a></li></ul></li></ul></div></div></div></div></main></div></div><footer class="footer"><div class="container container-fluid"><div class="footer__bottom text--center"><div class="margin-bottom--sm"><img src="/img/favicon.png" class="themedImage_ToTc themedImage--light_HNdA footer__logo"><img src="/img/favicon.png" class="themedImage_ToTc themedImage--dark_i4oU footer__logo"></div><div class="footer__copyright">Copyright © 2023 Apache Software Foundation. Except where otherwise noted, licensed under CC BY-SA 4.0. Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></div></footer></div> | |
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