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itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 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">Deep storage 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>Deep storage migration</h1></header><p>If you have been running an evaluation Druid cluster using local deep storage and wish to migrate to a |
| more production-capable deep storage system such as S3 or HDFS, this document describes the necessary steps.</p><p>Migration of deep storage involves the following steps at a high level:</p><ul><li>Copying segments from local deep storage to the new deep storage</li><li>Exporting Druid's segments table from metadata</li><li>Rewriting the load specs in the exported segment data to reflect the new deep storage location</li><li>Reimporting the edited segments into metadata</li></ul><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="copy-segments-from-old-deep-storage-to-new-deep-storage">Copy segments from old deep storage to new deep storage.<a href="#copy-segments-from-old-deep-storage-to-new-deep-storage" class="hash-link" aria-label="Direct link to Copy segments from old deep storage to new deep storage." title="Direct link to Copy segments from old deep storage to new deep storage."></a></h2><p>Before migrating, you will need to copy your old segments to the new deep storage.</p><p>For information on what path structure to use in the new deep storage, please see <a href="/docs/29.0.1/operations/export-metadata#deep-storage-migration">deep storage migration options</a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="export-segments-with-rewritten-load-specs">Export segments with rewritten load specs<a href="#export-segments-with-rewritten-load-specs" class="hash-link" aria-label="Direct link to Export segments with rewritten load specs" title="Direct link to Export segments with rewritten load specs"></a></h2><p>Druid provides an <a href="/docs/29.0.1/operations/export-metadata">Export Metadata Tool</a> for exporting metadata from Derby into CSV files |
| which can then be reimported.</p><p>By setting <a href="/docs/29.0.1/operations/export-metadata#deep-storage-migration">deep storage migration options</a>, the <code>export-metadata</code> tool will export CSV files where the segment load specs have been rewritten to load from your new deep storage location.</p><p>Run the <code>export-metadata</code> tool on your existing cluster, using the migration options appropriate for your new deep storage location, and save the CSV files it generates. After a successful export, you can shut down the coordinator.</p><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 generating the CSV exports with the modified segment data, you can reimport the contents of the Druid segments table from the generated CSVs.</p><p>Please refer to <a href="/docs/29.0.1/operations/export-metadata#importing-metadata">import commands</a> for examples. Only the <code>druid_segments</code> table needs to be imported.</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 segment table 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/29.0.1/operations/pull-deps"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">pull-deps tool</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/29.0.1/operations/export-metadata"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Export Metadata Tool</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="#copy-segments-from-old-deep-storage-to-new-deep-storage" class="table-of-contents__link toc-highlight">Copy segments from old deep storage to new deep storage.</a></li><li><a href="#export-segments-with-rewritten-load-specs" class="table-of-contents__link toc-highlight">Export segments with rewritten load specs</a><ul><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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