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that represents a specific kind of metadata (e.g. ownership, schema, statistics, upstreams).
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A metadata aspect on its own has no meaning (e.g. ownership for what?) and must be associated with a particular entity (e.g. ownership for PageViewEvent).
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We purposely not to impose any model requirement on metadata aspects, as each aspect is expected to differ significantly.</p><p>Metadata aspects are immutable by design, i.e. every change to a particular aspect results in a <a href="/docs/advanced/aspect-versioning">new version</a> created.
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An optional retention policy can be applied such that X number of most recent versions will be retained after each update.
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Setting X to 1 effectively means the metadata aspect is non-versioned.
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It is also possible to apply the retention based on time, e.g. only keeps the metadata changes from the past 30 days.</p><p>While a metadata aspect can be arbitrary complex document with multiple levels of nesting, it is sometimes desirable to break a monolithic aspect into smaller independent aspects.
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This will provide the benefits of:</p><ol><li><strong>Faster read/write</strong>: As metadata aspects are immutable, every "update" will lead to the writing the entire large aspect back to the underlying data store.
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Likewise, readers will need to retrieve the entire aspect even if it’s only interested in a small part of it.</li><li><strong>Ability to independently version different aspects</strong>: For example, one may like to get the change history of all the "ownership metadata" independent of the changes made to "schema metadata" for a dataset.</li><li><strong>Help with rest.li endpoint modeling</strong>: While it’s not required to have 1:1 mapping between rest.li endpoints and metadata aspects,
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it’d follow this pattern naturally, which means one will end up with smaller, more modular, endpoints instead of giant ones.</li></ol><p>Here’s an example metadata aspect. Note that the <code>admin</code> and <code>members</code> fields are implicitly conveying a relationship between <code>Group</code> entity & <code>User</code> entity.
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It’s very natural to save such relationships as URNs in a metadata aspect.
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The <a href="/docs/what/relationship">relationship</a> section explains how this relationship can be explicitly extracted and modelled.</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">namespace com.linkedin.group</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">import com.linkedin.common.AuditStamp</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">import com.linkedin.common.CorpuserUrn</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">/**</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> * The membership metadata for a group</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> */</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">record Membership {</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> /** Audit stamp for the last change */</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> auditStamp: AuditStamp</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> /** Admin of the group */</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> admin: CorpuserUrn</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> /** Members of the group, ordered in descending importance */</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> members: array[CorpuserUrn]</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">}</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></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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