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<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><a class="anchor" aria-hidden="true" id="shut-down-cluster-services"></a><a href="#shut-down-cluster-services" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Shut down cluster services</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><a class="anchor" aria-hidden="true" id="copy-segments-from-old-deep-storage-to-new-deep-storage"></a><a href="#copy-segments-from-old-deep-storage-to-new-deep-storage" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Copy segments from old deep storage to new deep storage.</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/latest/operations/export-metadata.html#deep-storage-migration">deep storage migration options</a>.</p>
<h2><a class="anchor" aria-hidden="true" id="export-segments-with-rewritten-load-specs"></a><a href="#export-segments-with-rewritten-load-specs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Export segments with rewritten load specs</h2>
<p>Druid provides an <a href="/docs/latest/operations/export-metadata.html">Export Metadata Tool</a> for exporting metadata from Derby into CSV files
which can then be reimported.</p>
<p>By setting <a href="/docs/latest/operations/export-metadata.html#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><a class="anchor" aria-hidden="true" id="import-metadata"></a><a href="#import-metadata" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Import metadata</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/latest/operations/export-metadata.html#importing-metadata">import commands</a> for examples. Only the <code>druid_segments</code> table needs to be imported.</p>
<h3><a class="anchor" aria-hidden="true" id="restart-cluster"></a><a href="#restart-cluster" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Restart cluster</h3>
<p>After importing the segment table successfully, you can now restart your cluster.</p>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/operations/pull-deps.html"><span class="arrow-prev">← </span><span>pull-deps tool</span></a><a class="docs-next button" href="/docs/latest/operations/export-metadata.html"><span>Export Metadata Tool</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#shut-down-cluster-services">Shut down cluster services</a></li><li><a href="#copy-segments-from-old-deep-storage-to-new-deep-storage">Copy segments from old deep storage to new deep storage.</a></li><li><a href="#export-segments-with-rewritten-load-specs">Export segments with rewritten load specs</a><ul class="toc-headings"><li><a href="#import-metadata">Import metadata</a></li><li><a href="#restart-cluster">Restart cluster</a></li></ul></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>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></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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