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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.
However, the granularity of update is always limited to each field in a PDL model.
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, were proposing the following entity-specific metadata delta model that allows atomic partial updates at any desired granularity.
Note that:</p><ol><li>Just like metadata <a href="/docs/what/aspect">aspects</a>, were not imposing any limit on the partial update model, as long as its a valid PDL record.
This is because the rest.li endpoint will have the logic that performs the corresponding partial update based on the information in the model.
That said, its common to have fields that denote the list of items to be added or removed (e.g. <code>membersToAdd</code> &amp; <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
(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="col
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