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padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" 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">Advanced Guides</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Configuring Database Retention</span><meta itemprop="position" content="2"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: Next</span><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"><h1>Configuring Database Retention</h1><h2 class="anchor anchorWithStickyNavbar_LWe7" id="goal">Goal<a href="#goal" class="hash-link" aria-label="Direct link to Goal" title="Direct link to Goal"></a></h2><p>DataHub stores different versions of <a href="/docs/what/aspect">metadata aspects</a> as they are ingested
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using a database (or key-value store). These multiple versions allow us to look at an aspect's historical changes and
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rollback to a previous version if incorrect metadata is ingested. However, every stored version takes additional storage
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space, while possibly bringing less value to the system. We need to be able to impose a <strong>retention</strong> policy on these
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records to keep the size of the DB in check.</p><p>Goal of the retention system is to be able to <strong>configure and enforce retention policies</strong> on documents at each of these
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various levels:</p><ul><li>global</li><li>entity-level</li><li>aspect-level</li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="what-type-of-retention-policies-are-supported">What type of retention policies are supported?<a href="#what-type-of-retention-policies-are-supported" class="hash-link" aria-label="Direct link to What type of retention policies are supported?" title="Direct link to What type of retention policies are supported?"></a></h2><p>We support 3 types of retention policies for aspects:</p><table><thead><tr><th align="center">Policy</th><th align="center">Versions Kept</th></tr></thead><tbody><tr><td align="center">Indefinite</td><td align="center">All versions</td></tr><tr><td align="center">Version-based</td><td align="center">Latest <em>N</em> versions</td></tr><tr><td align="center">Time-based</td><td align="center">Versions ingested in last <em>N</em> seconds</td></tr></tbody></table><p><strong>Note:</strong> The latest version (version 0) is never deleted. This ensures core functionality of DataHub is not impacted while applying retention.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="when-is-the-retention-policy-applied">When is the retention policy applied?<a href="#when-is-the-retention-policy-applied" class="hash-link" aria-label="Direct link to When is the retention policy applied?" title="Direct link to When is the retention policy applied?"></a></h2><p>As of now, retention policies are applied in two places:</p><ol><li><strong>GMS boot-up</strong>: A bootstrap step ingests the predefined set of retention policies. If no policy existed before or the existing policy
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was updated, an asynchronous call will be triggered. It will apply the retention policy (or policies) to <strong>all</strong> records in the database.</li><li><strong>Ingest</strong>: On every ingest, if an existing aspect got updated, it applies the retention policy to the urn-aspect pair being ingested.</li></ol><p>We are planning to support a cron-based application of retention in the near future to ensure that the time-based retention is applied correctly.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="how-to-configure">How to configure?<a href="#how-to-configure" class="hash-link" aria-label="Direct link to How to configure?" title="Direct link to How to configure?"></a></h2><p>We have enabled with feature by default. Please set <strong>ENTITY_SERVICE_ENABLE_RETENTION=false</strong> when
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creating the datahub-gms container/k8s pod to prevent the retention policies from taking effect.</p><p>On GMS start up, retention policies are initialized with:</p><ol><li>First, the default provided <strong>version-based</strong> retention to keep <strong>20 latest aspects</strong> for all entity-aspect pairs.</li><li>Second, we read YAML files from the <code>/etc/datahub/plugins/retention</code> directory and overlay them on the default set of policies we provide.</li></ol><p>For docker, we set docker-compose to mount <code>${HOME}/.datahub</code> directory to <code>/etc/datahub</code> directory
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within the containers, so you can customize the initial set of retention policies by creating
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a <code>${HOME}/.datahub/plugins/retention/retention.yaml</code> file.</p><p>We will support a standardized way to do this in Kubernetes setup in the near future.</p><p>The format for the YAML file is as follows:</p><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">entity</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"*"</span><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># denotes that policy will be applied to all entities</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">aspect</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"*"</span><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># denotes that policy will be applied to all aspects</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">config</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">retention</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">version</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">maxVersions</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">20</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">-</span><span class="token plain"> </span><span class="token key atrule">entity</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"dataset"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">aspect</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"datasetProperties"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">config</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">retention</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">version</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">maxVersions</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">20</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">time</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token key atrule">maxAgeInSeconds</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">2592000</span><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># 30 days</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><p>Note, it searches for the policies corresponding to the entity, aspect pair in the following order:</p><ol><li>entity, aspect</li><li>*<!-- -->, aspect</li><li>entity, <!-- -->*</li><li><em>, </em></li></ol><p>By restarting datahub-gms after creating the plugin yaml file, the new set of retention policies will be applied.</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="slackUtm_uoBr"><div class="slackUtm_uoBr"><hr>Need more help? 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