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</a><div class="searchBox_ZlJk"><button type="button" class="DocSearch DocSearch-Button" aria-label="Search"><span class="DocSearch-Button-Container"><svg width="20" height="20" class="DocSearch-Search-Icon" viewBox="0 0 20 20" aria-hidden="true"><path d="M14.386 14.386l4.0877 4.0877-4.0877-4.0877c-2.9418 2.9419-7.7115 2.9419-10.6533 0-2.9419-2.9418-2.9419-7.7115 0-10.6533 2.9418-2.9419 7.7115-2.9419 10.6533 0 2.9419 2.9418 2.9419 7.7115 0 10.6533z" stroke="currentColor" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round"></path></svg><span class="DocSearch-Button-Placeholder">Search</span></span><span class="DocSearch-Button-Keys"></span></button></div></div></div><div role="presentation" class="navbar-sidebar__backdrop"></div></nav><div id="__docusaurus_skipToContent_fallback" class="main-wrapper mainWrapper_z2l0 docsWrapper_BCFX"><button aria-label="Scroll back to top" class="clean-btn theme-back-to-top-button backToTopButton_sjWU" type="button"></button><div class="docPage__5DB"><main class="docMainContainer_gTbr docMainContainerEnhanced_Uz_u"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><span class="theme-doc-version-badge badge badge--secondary">Version: Next</span><div class="theme-doc-markdown markdown"><h1>What is a metadata delta?</h1><p>Rest.li supports <a href="https://linkedin.github.io/rest.li/user_guide/restli_server#partial_update" target="_blank" rel="noopener noreferrer">partial update</a> natively without needing explicitly defined models.
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However, the granularity of update is always limited to each field in a PDL model.
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There are cases where the update need to happen at an even finer grain, e.g. adding or removing items from an array.</p><p>To this end, we’re proposing the following entity-specific metadata delta model that allows atomic partial updates at any desired granularity.
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Note that:</p><ol><li>Just like metadata <a href="/docs/what/aspect">aspects</a>, we’re not imposing any limit on the partial update model, as long as it’s a valid PDL record.
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This is because the rest.li endpoint will have the logic that performs the corresponding partial update based on the information in the model.
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That said, it’s common to have fields that denote the list of items to be added or removed (e.g. <code>membersToAdd</code> & <code>membersToRemove</code> from below)</li><li>Similar to metadata <a href="/docs/what/snapshot">snapshots</a>, entity that supports metadata delta will add an entity-specific metadata delta
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(e.g. <code>GroupDelta</code> from below) that unions all supported partial update models.</li><li>The entity-specific metadata delta is then added to the global <code>Delta</code> typeref, which is added as part of <a href="/docs/what/mxe#metadata-change-event-mce">Metadata Change Event</a> and used during <a href="/docs/architecture/metadata-ingestion">Metadata Ingestion</a>.</li></ol><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.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"> * A metadata delta for a specific group entity</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 MembershipPartialUpdate {</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"> /** List of members to be added to the group */</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> membersToAdd: array[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"> /** List of members to be removed from the group */</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> membersToRemove: 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 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.metadata.delta</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.CorpGroupUrn</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">import com.linkedin.group.MembershipPartialUpdate</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"> * A metadata delta for a specific group entity</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 GroupDelta {</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"> /** URN for the entity the metadata delta is associated with */</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> urn: CorpGroupUrn</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"> /** The specific type of metadata delta to apply */</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> delta: union[MembershipPartialUpdate]</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 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.metadata.delta</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"> * A union of all supported metadata delta types.</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">typeref Delta = union[GroupDelta]</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" 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