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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">DataHub's Open Metadata Standard</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">Metadata Events</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>Metadata Events</h1><p>DataHub makes use a few important Kafka events for operation. The most notable of these include</p><ol><li>Metadata Change Proposal</li><li>Metadata Change Log (Versioned + Timeseries)</li><li>Platform Event</li></ol><p>Each event is originally authored using <a href="https://linkedin.github.io/rest.li/pdl_schema" target="_blank" rel="noopener noreferrer">PDL</a>, a modeling language developed by LinkedIn, and
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then converted into their Avro equivalents, which are used when writing and reading the events to Kafka.</p><p>In the document, we'll describe each of these events in detail - including notes about their structure & semantics.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="metadata-change-proposal-mcp">Metadata Change Proposal (MCP)<a href="#metadata-change-proposal-mcp" class="hash-link" aria-label="Direct link to Metadata Change Proposal (MCP)" title="Direct link to Metadata Change Proposal (MCP)"></a></h2><p>A Metadata Change Proposal represents a request to change to a specific <a href="/docs/what/aspect">aspect</a> on an enterprise's Metadata
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Graph. Each MCP provides a new value for a given aspect. For example, a single MCP can
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be emitted to change ownership or documentation or domains or deprecation status for a data asset.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="emission">Emission<a href="#emission" class="hash-link" aria-label="Direct link to Emission" title="Direct link to Emission"></a></h3><p>MCPs may be emitted by clients of DataHub's low-level ingestion APIs (e.g. ingestion sources)
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during the process of metadata ingestion. The DataHub Python API exposes an interface for
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easily sending MCPs into DataHub.</p><p>The default Kafka topic name for MCPs is <code>MetadataChangeProposal_v1</code>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="consumption">Consumption<a href="#consumption" class="hash-link" aria-label="Direct link to Consumption" title="Direct link to Consumption"></a></h3><p>DataHub's storage layer actively listens for new Metadata Change Proposals, attempts
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to apply the requested change to the Metadata Graph.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="schema">Schema<a href="#schema" class="hash-link" aria-label="Direct link to Schema" title="Direct link to Schema"></a></h3><table><thead><tr><th>Name</th><th>Type</th><th>Description</th><th>Optional</th></tr></thead><tbody><tr><td>entityUrn</td><td>String</td><td>The unique identifier for the Entity being changed. For example, a Dataset's urn.</td><td>False</td></tr><tr><td>entityType</td><td>String</td><td>The type of the entity the new aspect is associated with. This corresponds to the entity name in the DataHub Entity Registry, for example 'dataset'.</td><td>False</td></tr><tr><td>entityKeyAspect</td><td>Object</td><td>The key struct of the entity that was changed. Only present if the Metadata Change Proposal contained the raw key struct.</td><td>True</td></tr><tr><td>changeType</td><td>String</td><td>The change type. CREATE, UPSERT and DELETE are currently supported. PATCH has limited support for specific aspects</td><td>False</td></tr><tr><td>aspectName</td><td>String</td><td>The entity aspect which was changed.</td><td>False</td></tr><tr><td>aspect</td><td>Object</td><td>The new aspect value. Null if the aspect was deleted.</td><td>True</td></tr><tr><td>aspect.contentType</td><td>String</td><td>The serialization type of the aspect itself. The only supported value is <code>application/json</code>.</td><td>False</td></tr><tr><td>aspect.value</td><td>String</td><td>The serialized aspect. This is a JSON-serialized representing the aspect document originally defined in PDL. See <a href="https://github.com/datahub-project/datahub/tree/master/metadata-models/src/main/pegasus/com/linkedin" target="_blank" rel="noopener noreferrer">https://github.com/datahub-project/datahub/tree/master/metadata-models/src/main/pegasus/com/linkedin</a> for more.</td><td>False</td></tr><tr><td>systemMetadata</td><td>Object</td><td>The new system metadata. This includes the the ingestion run-id, model registry and more. For the full structure, see <a href="https://github.com/datahub-project/datahub/blob/master/metadata-models/src/main/pegasus/com/linkedin/mxe/SystemMetadata.pdl" target="_blank" rel="noopener noreferrer">https://github.com/datahub-project/datahub/blob/master/metadata-models/src/main/pegasus/com/linkedin/mxe/SystemMetadata.pdl</a></td><td>True</td></tr></tbody></table><p>The PDL schema can be found <a href="https://github.com/datahub-project/datahub/blob/master/metadata-models/src/main/pegasus/com/linkedin/mxe/MetadataChangeProposal.pdl" target="_blank" rel="noopener noreferrer">here</a>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="examples">Examples<a href="#examples" class="hash-link" aria-label="Direct link to Examples" title="Direct link to Examples"></a></h3><p>An MCP representing a request to update the 'ownership' aspect for a particular Dataset:</p><div class="language-json codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-json 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><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"entityType"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"dataset"</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 property">"entityUrn"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"urn:li:dataset:(urn:li:dataPlatform:hdfs,SampleHdfsDataset,PROD)"</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 property">"changeType"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"UPSERT"</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 property">"aspectName"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"ownership"</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 property">"aspect"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"value"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"{\"owners\":[{\"type\":\"DATAOWNER\",\"owner\":\"urn:li:corpuser:datahub\"}],\"lastModified\":{\"actor\":\"urn:li:corpuser:datahub\",\"time\":1651516640488}}"</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 property">"contentType"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"application/json"</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 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 property">"systemMetadata"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"lastObserved"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1651516640493</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 property">"runId"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"no-run-id-provided"</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 property">"registryName"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"unknownRegistry"</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 property">"registryVersion"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"0.0.0.0-dev"</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 property">"properties"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token null keyword" style="font-style:italic">null</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><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><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 how the aspect payload is serialized as JSON inside the "value" field. The exact structure
|
||
of the aspect is determined by its PDL schema. (For example, the <a href="https://github.com/datahub-project/datahub/blob/master/metadata-models/src/main/pegasus/com/linkedin/common/Ownership.pdl" target="_blank" rel="noopener noreferrer">ownership</a> schema)</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="metadata-change-log-mcl">Metadata Change Log (MCL)<a href="#metadata-change-log-mcl" class="hash-link" aria-label="Direct link to Metadata Change Log (MCL)" title="Direct link to Metadata Change Log (MCL)"></a></h2><p>A Metadata Change Log represents <em>any</em> change which has been made to the Metadata Graph.
|
||
Metadata Change Log events are emitted to Kafka immediately after writing the change
|
||
the durable storage.</p><p>There are 2 flavors of Metadata Change Log: <em>versioned</em> and <em>timeseries</em>. These correspond to the type
|
||
of aspects which were updated for a given change. <strong>Versioned</strong> aspects are those
|
||
which represent the "latest" state of some attributes, for example the most recent owners of an asset
|
||
or its documentation. <strong>Timeseries</strong> aspects are those which represent events related to an asset
|
||
that occurred at a particular time, for example profiling of a Dataset.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="emission-1">Emission<a href="#emission-1" class="hash-link" aria-label="Direct link to Emission" title="Direct link to Emission"></a></h3><p>MCLs are emitted when <em>any</em> change is made to an entity on the DataHub Metadata Graph, this includes
|
||
writing to any aspect of an entity.</p><p>Two distinct topics are maintained for Metadata Change Log. The default Kafka topic name for <strong>versioned</strong> aspects is <code>MetadataChangeLog_Versioned_v1</code> and for
|
||
<strong>timeseries</strong> aspects is <code>MetadataChangeLog_Timeseries_v1</code>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="consumption-1">Consumption<a href="#consumption-1" class="hash-link" aria-label="Direct link to Consumption" title="Direct link to Consumption"></a></h3><p>DataHub ships with a Kafka Consumer Job (mae-consumer-job) which listens for MCLs and uses them to update DataHub's search and graph indices,
|
||
as well as to generate derived Platform Events (described below).</p><p>In addition, the <a href="/docs/actions">Actions Framework</a> consumes Metadata Change Logs to power its <a href="/docs/actions/events/metadata-change-log-event">Metadata Change Log</a> event API.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="schema-1">Schema<a href="#schema-1" class="hash-link" aria-label="Direct link to Schema" title="Direct link to Schema"></a></h3><table><thead><tr><th>Name</th><th>Type</th><th>Description</th><th>Optional</th></tr></thead><tbody><tr><td>entityUrn</td><td>String</td><td>The unique identifier for the Entity being changed. For example, a Dataset's urn.</td><td>False</td></tr><tr><td>entityType</td><td>String</td><td>The type of the entity the new aspect is associated with. This corresponds to the entity name in the DataHub Entity Registry, for example 'dataset'.</td><td>False</td></tr><tr><td>entityKeyAspect</td><td>Object</td><td>The key struct of the entity that was changed. Only present if the Metadata Change Proposal contained the raw key struct.</td><td>True</td></tr><tr><td>changeType</td><td>String</td><td>The change type. CREATE, UPSERT and DELETE are currently supported.</td><td>False</td></tr><tr><td>aspectName</td><td>String</td><td>The entity aspect which was changed.</td><td>False</td></tr><tr><td>aspect</td><td>Object</td><td>The new aspect value. Null if the aspect was deleted.</td><td>True</td></tr><tr><td>aspect.contentType</td><td>String</td><td>The serialization type of the aspect itself. The only supported value is <code>application/json</code>.</td><td>False</td></tr><tr><td>aspect.value</td><td>String</td><td>The serialized aspect. This is a JSON-serialized representing the aspect document originally defined in PDL. See <a href="https://github.com/datahub-project/datahub/tree/master/metadata-models/src/main/pegasus/com/linkedin" target="_blank" rel="noopener noreferrer">https://github.com/datahub-project/datahub/tree/master/metadata-models/src/main/pegasus/com/linkedin</a> for more.</td><td>False</td></tr><tr><td>previousAspectValue</td><td>Object</td><td>The previous aspect value. Null if the aspect did not exist previously.</td><td>True</td></tr><tr><td>previousAspectValue.contentType</td><td>String</td><td>The serialization type of the aspect itself. The only supported value is <code>application/json</code></td><td>False</td></tr><tr><td>previousAspectValue.value</td><td>String</td><td>The serialized aspect. This is a JSON-serialized representing the aspect document originally defined in PDL. See <a href="https://github.com/datahub-project/datahub/tree/master/metadata-models/src/main/pegasus/com/linkedin" target="_blank" rel="noopener noreferrer">https://github.com/datahub-project/datahub/tree/master/metadata-models/src/main/pegasus/com/linkedin</a> for more.</td><td>False</td></tr><tr><td>systemMetadata</td><td>Object</td><td>The new system metadata. This includes the the ingestion run-id, model registry and more. For the full structure, see <a href="https://github.com/datahub-project/datahub/blob/master/metadata-models/src/main/pegasus/com/linkedin/mxe/SystemMetadata.pdl" target="_blank" rel="noopener noreferrer">https://github.com/datahub-project/datahub/blob/master/metadata-models/src/main/pegasus/com/linkedin/mxe/SystemMetadata.pdl</a></td><td>True</td></tr><tr><td>previousSystemMetadata</td><td>Object</td><td>The previous system metadata. This includes the the ingestion run-id, model registry and more. For the full structure, see <a href="https://github.com/datahub-project/datahub/blob/master/metadata-models/src/main/pegasus/com/linkedin/mxe/SystemMetadata.pdl" target="_blank" rel="noopener noreferrer">https://github.com/datahub-project/datahub/blob/master/metadata-models/src/main/pegasus/com/linkedin/mxe/SystemMetadata.pdl</a></td><td>True</td></tr><tr><td>created</td><td>Object</td><td>Audit stamp about who triggered the Metadata Change and when.</td><td>False</td></tr><tr><td>created.time</td><td>Number</td><td>The timestamp in milliseconds when the aspect change occurred.</td><td>False</td></tr><tr><td>created.actor</td><td>String</td><td>The URN of the actor (e.g. corpuser) that triggered the change.</td><td></td></tr></tbody></table><p>The PDL schema for can be found <a href="https://github.com/datahub-project/datahub/blob/master/metadata-models/src/main/pegasus/com/linkedin/mxe/MetadataChangeLog.pdl" target="_blank" rel="noopener noreferrer">here</a>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="examples-1">Examples<a href="#examples-1" class="hash-link" aria-label="Direct link to Examples" title="Direct link to Examples"></a></h3><p>An MCL corresponding to a change in the 'ownership' aspect for a particular Dataset:</p><div class="language-json codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-json 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><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"entityType"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"dataset"</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 property">"entityUrn"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"urn:li:dataset:(urn:li:dataPlatform:hdfs,SampleHdfsDataset,PROD)"</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 property">"changeType"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"UPSERT"</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 property">"aspectName"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"ownership"</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 property">"aspect"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"value"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"{\"owners\":[{\"type\":\"DATAOWNER\",\"owner\":\"urn:li:corpuser:datahub\"}],\"lastModified\":{\"actor\":\"urn:li:corpuser:datahub\",\"time\":1651516640488}}"</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 property">"contentType"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"application/json"</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 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 property">"previousAspectValue"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"value"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"{\"owners\":[{\"owner\":\"urn:li:corpuser:jdoe\",\"type\":\"DATAOWNER\"},{\"owner\":\"urn:li:corpuser:datahub\",\"type\":\"DATAOWNER\"}],\"lastModified\":{\"actor\":\"urn:li:corpuser:jdoe\",\"time\":1581407189000}}"</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 property">"contentType"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"application/json"</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 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 property">"systemMetadata"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"lastObserved"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1651516640493</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 property">"runId"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"no-run-id-provided"</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 property">"registryName"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"unknownRegistry"</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 property">"registryVersion"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"0.0.0.0-dev"</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 property">"properties"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token null keyword" style="font-style:italic">null</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 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 property">"previousSystemMetadata"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"lastObserved"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1651516415088</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 property">"runId"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"file-2022_05_02-11_33_35"</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 property">"registryName"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token null keyword" style="font-style:italic">null</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 property">"registryVersion"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token null keyword" style="font-style:italic">null</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 property">"properties"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token null keyword" style="font-style:italic">null</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 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 property">"created"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"time"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1651516640490</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 property">"actor"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"urn:li:corpuser:datahub"</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 property">"impersonator"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token null keyword" style="font-style:italic">null</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><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><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 how the aspect payload is serialized as JSON inside the "value" field. The exact structure
|
||
of the aspect is determined by its PDL schema. (For example, the <a href="https://github.com/datahub-project/datahub/blob/master/metadata-models/src/main/pegasus/com/linkedin/common/Ownership.pdl" target="_blank" rel="noopener noreferrer">ownership</a> schema)</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="platform-event-pe">Platform Event (PE)<a href="#platform-event-pe" class="hash-link" aria-label="Direct link to Platform Event (PE)" title="Direct link to Platform Event (PE)"></a></h2><p>A Platform Event represents an arbitrary business-logic event emitted by DataHub. Each
|
||
Platform Event has a <code>name</code> which determines its contents.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="types">Types<a href="#types" class="hash-link" aria-label="Direct link to Types" title="Direct link to Types"></a></h3><ul><li><strong>Entity Change Event</strong> (entityChangeEvent): The most important Platform Event is named <strong>Entity Change Event</strong>, and represents a log of semantic changes
|
||
(tag addition, removal, deprecation change, etc) that have occurred on DataHub. It is used an important
|
||
component of the DataHub Actions Framework.</li></ul><p>All registered Platform Event types are declared inside the DataHub Entity Registry (<code>entity-registry.yml</code>).</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="emission-2">Emission<a href="#emission-2" class="hash-link" aria-label="Direct link to Emission" title="Direct link to Emission"></a></h3><p>All Platform Events are generated by DataHub itself during normal operation.</p><p>PEs are extremely dynamic - they can contain arbitrary payloads depending on the <code>name</code>. Thus,
|
||
can be emitted in a variety of circumstances.</p><p>The default Kafka topic name for all Platform Events is <code>PlatformEvent_v1</code>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="consumption-2">Consumption<a href="#consumption-2" class="hash-link" aria-label="Direct link to Consumption" title="Direct link to Consumption"></a></h3><p>The <a href="/docs/actions">Actions Framework</a> consumes Platform Events to power its <a href="/docs/actions/events/entity-change-event">Entity Change Event</a> API.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="schema-2">Schema<a href="#schema-2" class="hash-link" aria-label="Direct link to Schema" title="Direct link to Schema"></a></h3><table><thead><tr><th>Name</th><th>Type</th><th>Description</th><th>Optional</th></tr></thead><tbody><tr><td>header</td><td>Object</td><td>Header fields</td><td>False</td></tr><tr><td>header.timestampMillis</td><td>Long</td><td>The time at which the event was generated.</td><td>False</td></tr><tr><td>name</td><td>String</td><td>The name / type of the event.</td><td>False</td></tr><tr><td>payload</td><td>Object</td><td>The event itself.</td><td>False</td></tr><tr><td>payload.contentType</td><td>String</td><td>The serialization type of the event payload. The only supported value is <code>application/json</code>.</td><td>False</td></tr><tr><td>payload.value</td><td>String</td><td>The serialized payload. This is a JSON-serialized representing the payload document originally defined in PDL. See <a href="https://github.com/datahub-project/datahub/tree/master/metadata-models/src/main/pegasus/com/linkedin" target="_blank" rel="noopener noreferrer">https://github.com/datahub-project/datahub/tree/master/metadata-models/src/main/pegasus/com/linkedin</a> for more.</td><td>False</td></tr></tbody></table><p>The full PDL schema can be found <a href="https://github.com/datahub-project/datahub/blob/master/metadata-models/src/main/pegasus/com/linkedin/mxe/PlatformEvent.pdl" target="_blank" rel="noopener noreferrer">here</a>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="examples-2">Examples<a href="#examples-2" class="hash-link" aria-label="Direct link to Examples" title="Direct link to Examples"></a></h3><p>An example of an 'Entity Change Event' Platform Event that is emitted when a new owner is added to a Dataset:</p><div class="language-json codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-json 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><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"header"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"timestampMillis"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1655390732551</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 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 property">"name"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"entityChangeEvent"</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 property">"payload"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"value"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"{\"entityUrn\":\"urn:li:dataset:abc\",\"entityType\":\"dataset\",\"category\":\"OWNER\",\"operation\":\"ADD\",\"modifier\":\"urn:li:corpuser:jdoe\",\"parameters\":{\"ownerUrn\":\"urn:li:corpuser:jdoe\",\"ownerType\":\"BUSINESS_OWNER\"},\"auditStamp\":{\"actor\":\"urn:li:corpuser:jdoe\",\"time\":1649953100653}}"</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 property">"contentType"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"application/json"</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><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 how the actual payload for the event is serialized as JSON inside the 'payload' field. The exact
|
||
structure of the Platform Event is determined by its PDL schema. (For example, the <a href="https://github.com/datahub-project/datahub/blob/master/metadata-models/src/main/pegasus/com/linkedin/platform/event/v1/EntityChangeEvent.pdl" target="_blank" rel="noopener noreferrer">Entity Change Event</a> schema)</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="failed-metadata-change-proposal-fmcp">Failed Metadata Change Proposal (FMCP)<a href="#failed-metadata-change-proposal-fmcp" class="hash-link" aria-label="Direct link to Failed Metadata Change Proposal (FMCP)" title="Direct link to Failed Metadata Change Proposal (FMCP)"></a></h2><p>When a Metadata Change Proposal cannot be processed successfully, the event is written to a <a href="https://en.wikipedia.org/wiki/Dead_letter_queue" target="_blank" rel="noopener noreferrer">dead letter queue</a>
|
||
in an event called Failed Metadata Change Proposal (FMCP).</p><p>The event simply wraps the original Metadata Change Proposal and an error message, which contains the reason for rejection.
|
||
This event can be used for debugging any potential ingestion issues, as well as for re-playing any previous rejected proposal if necessary.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="emission-3">Emission<a href="#emission-3" class="hash-link" aria-label="Direct link to Emission" title="Direct link to Emission"></a></h3><p>FMCEs are emitted when MCEs cannot be successfully committed to DataHub's storage layer.</p><p>The default Kafka topic name for FMCPs is <code>FailedMetadataChangeProposal_v1</code>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="consumption-3">Consumption<a href="#consumption-3" class="hash-link" aria-label="Direct link to Consumption" title="Direct link to Consumption"></a></h3><p>No active consumers.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="schema-3">Schema<a href="#schema-3" class="hash-link" aria-label="Direct link to Schema" title="Direct link to Schema"></a></h3><p>The PDL schema can be found <a href="https://github.com/datahub-project/datahub/blob/master/metadata-models/src/main/pegasus/com/linkedin/mxe/FailedMetadataChangeProposal.pdl" target="_blank" rel="noopener noreferrer">here</a>.</p><h1>Deprecated Events</h1><p>DataHub ships with a set of deprecated events, which were historically used for proposing and logging
|
||
changes to the Metadata Graph.</p><p>Each event in this category was deprecated due to its inflexibility - namely the fact that
|
||
the schemas had to be updated when a new aspect was introduced. These events have since been replaced
|
||
by the more flexible events described above (Metadata Change Proposal, Metadata Change Log).</p><p>It is not recommended to build dependencies on deprecated events.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="metadata-change-event-mce">Metadata Change Event (MCE)<a href="#metadata-change-event-mce" class="hash-link" aria-label="Direct link to Metadata Change Event (MCE)" title="Direct link to Metadata Change Event (MCE)"></a></h2><p>A Metadata Change Event represents a request to change multiple aspects for the same entity.
|
||
It leverages a deprecated concept of <code>Snapshot</code>, which is a strongly-typed list of aspects for the same
|
||
entity.</p><p>A MCE is a "proposal" for a set of metadata changes, as opposed to <a href="#metadata-audit-event-mae">MAE</a>, which is conveying a committed change.
|
||
Consequently, only successfully accepted and processed MCEs will lead to the emission of a corresponding MAE / MCLs.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="emission-4">Emission<a href="#emission-4" class="hash-link" aria-label="Direct link to Emission" title="Direct link to Emission"></a></h3><p>MCEs may be emitted by clients of DataHub's low-level ingestion APIs (e.g. ingestion sources)
|
||
during the process of metadata ingestion.</p><p>The default Kafka topic name for MCEs is <code>MetadataChangeEvent_v4</code>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="consumption-4">Consumption<a href="#consumption-4" class="hash-link" aria-label="Direct link to Consumption" title="Direct link to Consumption"></a></h3><p>DataHub's storage layer actively listens for new Metadata Change Events, attempts
|
||
to apply the requested changes to the Metadata Graph.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="schema-4">Schema<a href="#schema-4" class="hash-link" aria-label="Direct link to Schema" title="Direct link to Schema"></a></h3><p>The PDL schema can be found <a href="https://github.com/datahub-project/datahub/blob/master/metadata-models/src/main/pegasus/com/linkedin/mxe/MetadataChangeEvent.pdl" target="_blank" rel="noopener noreferrer">here</a>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="examples-3">Examples<a href="#examples-3" class="hash-link" aria-label="Direct link to Examples" title="Direct link to Examples"></a></h3><p>An example of an MCE emitted to change the 'ownership' aspect for an Entity:</p><div class="language-json codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-json 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><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"proposedSnapshot"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"com.linkedin.pegasus2avro.metadata.snapshot.DatasetSnapshot"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"urn"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"urn:li:dataset:(urn:li:dataPlatform:hive,SampleHiveDataset,PROD)"</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 property">"aspects"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 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 property">"com.linkedin.pegasus2avro.common.Ownership"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"owners"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 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 property">"owner"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"urn:li:corpuser:jdoe"</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 property">"type"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"DATAOWNER"</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 property">"source"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token null keyword" style="font-style:italic">null</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 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 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 property">"owner"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"urn:li:corpuser:datahub"</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 property">"type"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"DATAOWNER"</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 property">"source"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token null keyword" style="font-style:italic">null</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><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 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 property">"lastModified"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"time"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1581407189000</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 property">"actor"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"urn:li:corpuser:jdoe"</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 property">"impersonator"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token null keyword" style="font-style:italic">null</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><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><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><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><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><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><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><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><h2 class="anchor anchorWithStickyNavbar_LWe7" id="metadata-audit-event-mae">Metadata Audit Event (MAE)<a href="#metadata-audit-event-mae" class="hash-link" aria-label="Direct link to Metadata Audit Event (MAE)" title="Direct link to Metadata Audit Event (MAE)"></a></h2><p>A Metadata Audit Event captures changes made to one or multiple metadata <a href="/docs/what/aspect">aspects</a> associated with a particular <a href="/docs/what/entity">entity</a>, in the form of a metadata <a href="/docs/what/snapshot">snapshot</a> (deprecated) before the change, and a metadata snapshot after the change.</p><p>Every source-of-truth for a particular metadata aspect is expected to emit a MAE whenever a change is committed to that aspect. By ensuring that, any listener of MAE will be able to construct a complete view of the latest state for all aspects.
|
||
Furthermore, because each MAE contains the "after image", any mistake made in emitting the MAE can be easily mitigated by emitting a follow-up MAE with the correction. By the same token, the initial bootstrap problem for any newly added entity can also be solved by emitting a MAE containing all the latest metadata aspects associated with that entity.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="emission-5">Emission<a href="#emission-5" class="hash-link" aria-label="Direct link to Emission" title="Direct link to Emission"></a></h3><blockquote><p>Note: In recent versions of DataHub (mid 2022), MAEs are no longer actively emitted, and will soon be completely removed from DataHub.
|
||
Use Metadata Change Log instead.</p></blockquote><p>MAEs are emitted once any metadata change has been successfully committed into DataHub's storage
|
||
layer.</p><p>The default Kafka topic name for MAEs is <code>MetadataAuditEvent_v4</code>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="consumption-5">Consumption<a href="#consumption-5" class="hash-link" aria-label="Direct link to Consumption" title="Direct link to Consumption"></a></h3><p>No active consumers.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="schema-5">Schema<a href="#schema-5" class="hash-link" aria-label="Direct link to Schema" title="Direct link to Schema"></a></h3><p>The PDL schema can be found <a href="https://github.com/datahub-project/datahub/blob/master/metadata-models/src/main/pegasus/com/linkedin/mxe/MetadataAuditEvent.pdl" target="_blank" rel="noopener noreferrer">here</a>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="examples-4">Examples<a href="#examples-4" class="hash-link" aria-label="Direct link to Examples" title="Direct link to Examples"></a></h3><p>An example of an MAE emitted representing a change made to the 'ownership' aspect for an Entity (owner removed):</p><div class="language-json codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-json 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><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"oldSnapshot"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"com.linkedin.pegasus2avro.metadata.snapshot.DatasetSnapshot"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"urn"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"urn:li:dataset:(urn:li:dataPlatform:hive,SampleHiveDataset,PROD)"</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 property">"aspects"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 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 property">"com.linkedin.pegasus2avro.common.Ownership"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"owners"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 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 property">"owner"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"urn:li:corpuser:jdoe"</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 property">"type"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"DATAOWNER"</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 property">"source"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token null keyword" style="font-style:italic">null</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 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 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 property">"owner"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"urn:li:corpuser:datahub"</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 property">"type"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"DATAOWNER"</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 property">"source"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token null keyword" style="font-style:italic">null</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><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 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 property">"lastModified"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"time"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1581407189000</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 property">"actor"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"urn:li:corpuser:jdoe"</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 property">"impersonator"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token null keyword" style="font-style:italic">null</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><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><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><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><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><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 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 property">"newSnapshot"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"com.linkedin.pegasus2avro.metadata.snapshot.DatasetSnapshot"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"urn"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"urn:li:dataset:(urn:li:dataPlatform:hive,SampleHiveDataset,PROD)"</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 property">"aspects"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 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 property">"com.linkedin.pegasus2avro.common.Ownership"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"owners"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 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 property">"owner"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"urn:li:corpuser:datahub"</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 property">"type"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"DATAOWNER"</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 property">"source"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token null keyword" style="font-style:italic">null</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><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 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 property">"lastModified"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </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 property">"time"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1581407189000</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 property">"actor"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"urn:li:corpuser:jdoe"</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 property">"impersonator"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token null keyword" style="font-style:italic">null</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><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><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><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><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><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><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><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><h2 class="anchor anchorWithStickyNavbar_LWe7" id="failed-metadata-change-event-fmce">Failed Metadata Change Event (FMCE)<a href="#failed-metadata-change-event-fmce" class="hash-link" aria-label="Direct link to Failed Metadata Change Event (FMCE)" title="Direct link to Failed Metadata Change Event (FMCE)"></a></h2><p>When a Metadata Change Event cannot be processed successfully, the event is written to a <a href="https://en.wikipedia.org/wiki/Dead_letter_queue" target="_blank" rel="noopener noreferrer">dead letter queue</a> in an event called Failed Metadata Change Event (FMCE).</p><p>The event simply wraps the original Metadata Change Event and an error message, which contains the reason for rejection.
|
||
This event can be used for debugging any potential ingestion issues, as well as for re-playing any previous rejected proposal if necessary.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="emission-6">Emission<a href="#emission-6" class="hash-link" aria-label="Direct link to Emission" title="Direct link to Emission"></a></h3><p>FMCEs are emitted when MCEs cannot be successfully committed to DataHub's storage layer.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="consumption-6">Consumption<a href="#consumption-6" class="hash-link" aria-label="Direct link to Consumption" title="Direct link to Consumption"></a></h3><p>No active consumers.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="schema-6">Schema<a href="#schema-6" class="hash-link" aria-label="Direct link to Schema" title="Direct link to Schema"></a></h3><p>The PDL schema can be found <a href="https://github.com/datahub-project/datahub/blob/master/metadata-models/src/main/pegasus/com/linkedin/mxe/FailedMetadataChangeEvent.pdl" target="_blank" rel="noopener noreferrer">here</a>.</p><p>The default Kafka topic name for FMCEs is <code>FailedMetadataChangeEvent_v4</code>.</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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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/metadata-modeling/metadata-model"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">The Metadata Model</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/generated/metamodel/entities/dataplatform"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Data Platform</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="#metadata-change-proposal-mcp" class="table-of-contents__link toc-highlight">Metadata Change Proposal (MCP)</a><ul><li><a href="#emission" class="table-of-contents__link toc-highlight">Emission</a></li><li><a href="#consumption" class="table-of-contents__link toc-highlight">Consumption</a></li><li><a href="#schema" class="table-of-contents__link toc-highlight">Schema</a></li><li><a href="#examples" class="table-of-contents__link toc-highlight">Examples</a></li></ul></li><li><a href="#metadata-change-log-mcl" class="table-of-contents__link toc-highlight">Metadata Change Log (MCL)</a><ul><li><a href="#emission-1" class="table-of-contents__link toc-highlight">Emission</a></li><li><a href="#consumption-1" class="table-of-contents__link toc-highlight">Consumption</a></li><li><a href="#schema-1" class="table-of-contents__link toc-highlight">Schema</a></li><li><a href="#examples-1" class="table-of-contents__link toc-highlight">Examples</a></li></ul></li><li><a href="#platform-event-pe" class="table-of-contents__link toc-highlight">Platform Event (PE)</a><ul><li><a href="#types" class="table-of-contents__link 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