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<div role="region" aria-label="Skip to main content"><a class="skipToContent_fXgn" href="#__docusaurus_skipToContent_fallback">Skip to main content</a></div><div class="announcementBar_mb4j" style="background-color:transparent;color:#ffffff" role="banner"><div class="content_knG7 announcementBarContent_xLdY"><div class="shimmer-banner"><p><strong>CONTEXT:</strong> The Future of Agentic AI is On Demand</p><a href="https://datahub.com/resources/context/?utm_source=event&utm_medium=&utm_campaign=16839686-FY25-Q4-EVENT-CONTEXT-MAIS&utm_term=docs" target="_blank" class="button"><div>Watch Now<span> →</span></div></a></div></div></div><nav aria-label="Main" class="navbar navbar--fixed-top"><div class="navbar__inner"><div class="navbar__items"><button aria-label="Toggle navigation bar" aria-expanded="false" class="navbar__toggle clean-btn" type="button"><svg width="30" height="30" viewBox="0 0 30 30" aria-hidden="true"><path stroke="currentColor" stroke-linecap="round" stroke-miterlimit="10" stroke-width="2" d="M4 7h22M4 15h22M4 23h22"></path></svg></button><a href="https://datahub.com" target="_blank" rel="noopener noreferrer" class="navbar__brand"><div class="navbar__logo"><img src="/img/datahub-logo-color-light-horizontal.svg" alt="DataHub Logo" class="themedImage_ToTc themedImage--light_HNdA"><img src="/img/datahub-logo-color-dark-horizontal.svg" alt="DataHub Logo" class="themedImage_ToTc themedImage--dark_i4oU"></div></a><div class="navbar__item dropdown dropdown--hoverable"><a href="#" aria-haspopup="true" aria-expanded="false" role="button" class="navbar__link versionNavItem_cbn8">Next</a><ul class="dropdown__menu"><li><a aria-current="page" class="dropdown__link dropdown__link--active" href="/docs/advanced/mcp-mcl">Next</a></li><li><a class="dropdown__link" href="/docs/1.1.0/advanced/mcp-mcl">1.1.0</a></li><li><hr class="dropdown-separator" style="margin: 0.4rem;"></li><li><div class="dropdown__link"><b>Archived versions</b></div></li><li>
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if the conditions are not met.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="if-version-match">If-Version-Match<a href="#if-version-match" class="hash-link" aria-label="Direct link to If-Version-Match" title="Direct link to If-Version-Match"></a></h4><p>Each time an aspect is updated a <code>version</code> is incremented to represent the change to the aspect. This <code>version</code> is stored and returned
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in <code>SystemMetadata</code>.</p><p>A writer can provide a header with the expected <code>version</code> when initiating the request. If the expected <code>version</code> does not
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match the actual <code>version</code> stored in the database, the write will fail. This prevents overwriting an aspect that has
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been modified by another process.</p><p>Note: If the aspect doesn't exist yet, then the <code>version</code> is <code>-1</code>. A writer can use this <code>version</code> to only create
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an aspect if it doesn't. Also see <em>Change Types: <!-- -->[<code>CREATE</code>, <code>CREATE_ENTITY</code>]</em> section below.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="if-modified-since--if-unmodified-since">If-Modified-Since / If-Unmodified-Since<a href="#if-modified-since--if-unmodified-since" class="hash-link" aria-label="Direct link to If-Modified-Since / If-Unmodified-Since" title="Direct link to If-Modified-Since / If-Unmodified-Since"></a></h4><p>A writer may also specify time-based conditions using http header semantics. Similar to version based conditional writes
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this method can be used to prevent the write if the target aspect was modified after a reading the aspect. Per the
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http specification dates must comply with ISO-8601 standard.</p><p><code>If-Unmodified-Since</code>:
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A writer can specify that the aspect must NOT have been modified after a specific time, following <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-Unmodified-Since" target="_blank" rel="noopener noreferrer">If-Unmodified-Since</a> http headers.</p><p><code>If-Modified-Since</code>
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A writer can specify that the aspect must have been modified after a specific time, following <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-Modified-Since" target="_blank" rel="noopener noreferrer">If-Modified-Since</a> http headers.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="change-types-create-create_entity">Change Types: <!-- -->[<code>CREATE</code>, <code>CREATE_ENTITY</code>]<a href="#change-types-create-create_entity" class="hash-link" aria-label="Direct link to change-types-create-create_entity" title="Direct link to change-types-create-create_entity"></a></h4><p>Another form of conditional writes which considers the existence of an aspect or entity uses the following Change Types.</p><p><code>CREATE</code> - Create the aspect if it doesn't already exist.</p><p><code>CREATE_ENTITY</code> - Create the aspect if no aspects exist for the entity.</p><p>By default, a validation exception is thrown if the <code>CREATE</code>/<code>CREATE_ENTITY</code> constraint is violated. If the write operation
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should be dropped without considering it an exception, then add the following header: <code>If-None-Match: *</code> to the MCP.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="synchronous-elasticsearch-updates">Synchronous ElasticSearch Updates<a href="#synchronous-elasticsearch-updates" class="hash-link" aria-label="Direct link to Synchronous ElasticSearch Updates" title="Direct link to Synchronous ElasticSearch Updates"></a></h3><p>The writes to the elasticsearch are asynchronous by default. A writer can add a custom header
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<code>X-DataHub-Sync-Index-Update</code> to the MCP <code>headers</code> with value set to <code>true</code> to enable a synchronous update of
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elasticsearch for specific MCPs that may benefit from it.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="change-data-capture-cdc-mode-for-generating-mcls">Change Data Capture (CDC) Mode for Generating MCLs<a href="#change-data-capture-cdc-mode-for-generating-mcls" class="hash-link" aria-label="Direct link to Change Data Capture (CDC) Mode for Generating MCLs" title="Direct link to Change Data Capture (CDC) Mode for Generating MCLs"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="overview">Overview<a href="#overview" class="hash-link" aria-label="Direct link to Overview" title="Direct link to Overview"></a></h3><p>DataHub supports an optional CDC (Change Data Capture) mode for generating MetadataChangeLogs. In CDC mode, MCLs are generated from database change events captured directly from the metadata storage layer, rather than being produced by GMS after processing MCPs. This mechanism <strong>guarantees that MCLs are generated in the same order as database writes</strong>, providing stronger ordering guarantees for metadata changes.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="cdc-vs-traditional-mcl-generation">CDC vs Traditional MCL Generation<a href="#cdc-vs-traditional-mcl-generation" class="hash-link" aria-label="Direct link to CDC vs Traditional MCL Generation" title="Direct link to CDC vs Traditional MCL Generation"></a></h3><p><strong>Traditional Mode (Default)</strong>:</p><ul><li>GMS processes MCPs and writes to the database</li><li>GMS immediately produces MCLs to Kafka after successful database writes</li><li>MCL order matches MCP processing order</li></ul><p><strong>CDC Mode</strong>:</p><ul><li>GMS processes MCPs and writes to the database (MCL emission disabled)</li><li>CDC system (Debezium) captures database changes as they occur</li><li>MCE Consumer reads CDC events and generates MCLs via EntityService</li><li>MCL order matches database transaction commit order</li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="architecture">Architecture<a href="#architecture" class="hash-link" aria-label="Direct link to Architecture" title="Direct link to Architecture"></a></h3><p>In CDC mode, the flow is:</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">MCP → GMS (write to DB, no MCL) → CDC Source → CDC Topic → MCE Consumer → MCL generation via EntityService → MCL Topics</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>For detailed configuration instructions, see:</p><ul><li><a href="/docs/how/configure-cdc">CDC Configuration Guide</a></li><li><a href="/docs/deploy/environment-vars#change-data-capture-cdc-configuration">Environment Variables Reference</a></li></ul></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="slackUtm_uoBr"><div class="slackUtm_uoBr"><hr>Need more help? Join the conversation in <a href="https://datahub.com/slack?utm_source=docs&utm_medium=footer&utm_campaign=docs_footer&utm_content=docs/advanced/mcp-mcl">Slack!</a></div></div><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/datahub-project/datahub/blob/master/docs/advanced/mcp-mcl.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="cur
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