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font-weight: 600;
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color: transparent;
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background: linear-gradient(40deg, var(--ifm-menu-color-active), #ff1493);
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background-clip: text;
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animation: gradientShift 3s ease infinite;
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@keyframes gradientShift {
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0%, 100% { background-position: 0% 50%; }
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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></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="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_VsjB"></div></div></footer><div class="feedbackWrapper_mUHF"><div class="feedbackWidget_PX4d"><div class="feedbackButtons_wn3V"><strong>Is this page helpful?</strong><div><button class="feedbackButton_UgQs"><span role="img" aria-label="like" class="anticon anticon-like"><svg viewBox="64 64 896 896" focusable="false" data-icon="like" width="1em" height="1em" fill="currentColor" aria-hidden="true"><path d="M885.9 533.7c16.8-22.2 26.1-49.4 26.1-77.7 0-44.9-25.1-87.4-65.5-111.1a67.67 67.67 0 00-34.3-9.3H572.4l6-122.9c1.4-29.7-9.1-57.9-29.5-79.4A106.62 106.62 0 00471 99.9c-52 0-98 35-111.8 85.1l-85.9 311H144c-17.7 0-32 14.3-32 32v364c0 17.7 14.3 32 32 32h601.3c9.2 0 18.2-1.8 26.5-5.4 47.6-20.3 78.3-66.8 78.3-118.4 0-12.6-1.8-25-5.4-37 16.8-22.2 26.1-49.4 26.1-77.7 0-12.6-1.8-25-5.4-37 16.8-22.2 26.1-49.4 26.1-77.7-.2-12.6-2-25.1-5.6-37.1zM184 852V568h81v284h-81zm636.4-353l-21.9 19 13.9 25.4a56.2 56.2 0 016.9 27.3c0 16.5-7.2 32.2-19.6 43l-21.9 19 13.9 25.4a56.2 56.2 0 016.9 27.3c0 16.5-7.2 32.2-19.6 43l-21.9 19 13.9 25.4a56.2 56.2 0 016.9 27.3c0 22.4-13.2 42.6-33.6 51.8H329V564.8l99.5-360.5a44.1 44.1 0 0142.2-32.3c7.6 0 15.1 2.2 21.1 6.7 9.9 7.4 15.2 18.6 14.6 30.5l-9.6 198.4h314.4C829 418.5 840 436.9 840 456c0 16.5-7.2 32.1-19.6 43z"></path></svg></span></button><button class="feedbackButton_UgQs"><span role="img" aria-label="dislike" class="anticon anticon-dislike"><svg viewBox="64 64 896 896" focusable="false" data-icon="dislike" width="1em" height="1em" fill="currentColor" aria-hidden="true"><path d="M885.9 490.3c3.6-12 5.4-24.4 5.4-37 0-28.3-9.3-55.5-26.1-77.7 3.6-12 5.4-24.4 5.4-37 0-28.3-9.3-55.5-26.1-77.7 3.6-12 5.4-24.4 5.4-37 0-51.6-30.7-98.1-78.3-118.4a66.1 66.1 0 00-26.5-5.4H144c-17.7 0-32 14.3-32 32v364c0 17.7 14.3 32 32 32h129.3l85.8 310.8C372.9 889 418.9 924 470.9 924c29.7 0 57.4-11.8 77.9-33.4 20.5-21.5 31-49.7 29.5-79.4l-6-122.9h239.9c12.1 0 23.9-3.2 34.3-9.3 40.4-23.5 65.5-66.1 65.5-111 0-28.3-9.3-55.5-26.1-77.7zM184 456V172h81v284h-81zm627.2 160.4H496.8l9.6 198.4c.6 11.9-4.7 23.1-14.6 30.5-6.1 4.5-13.6 6.8-21.1 6.7a44.28 44.28 0 01-42.2-32.3L329 459.2V172h415.4a56.85 56.85 0 0133.6 51.8c0 9.7-2.3 18.9-6.9 27.3l-13.9 25.4 21.9 19a56.76 56.76 0 0119.6 43c0 9.7-2.3 18.9-6.9 27.3l-13.9 25.4 21.9 19a56.76 56.76 0 0119.6 43c0 9.7-2.3 18.9-6.9 27.3l-14 25.5 21.9 19a56.76 56.76 0 0119.6 43c0 19.1-11 37.5-28.8 48.4z"></path></svg></span></button></div></div></div></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/troubleshooting/general"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">General Debugging Guide</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/advanced/writing-mcps"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Saving MCPs to a File</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="#overview--vision" class="table-of-contents__link to
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