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<h1 id="deep-storage-migration">Deep Storage Migration</h1>
<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:
- Copying segments from local deep storage to the new deep storage
- Exporting Druid&#39;s segments table from metadata
- Rewriting the load specs in the exported segment data to reflect the new deep storage location
- Reimporting the edited segments into metadata</p>
<h2 id="shut-down-cluster-services">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 id="copy-segments-from-old-deep-storage-to-new-deep-storage">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="../operations/export-metadata.html#deep-storage-migration">deep storage migration options</a>.</p>
<h2 id="export-segments-with-rewritten-load-specs">Export segments with rewritten load specs</h2>
<p>Druid provides an <a href="../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="../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 id="import-metadata">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="../operations/export-metadata.html#importing-metadata">import commands</a> for examples. Only the <code>druid_segments</code> table needs to be imported.</p>
<h3 id="restart-cluster">Restart cluster</h3>
<p>After importing the segment table successfully, you can now restart your cluster.</p>
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