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<title data-rh="true">Emitting Patch Updates to DataHub | DataHub</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://docs.datahub.com/docs/advanced/patch"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-default-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-current"><meta data-rh="true" property="og:title" content="Emitting Patch Updates to DataHub | DataHub"><meta data-rh="true" name="description" content="Why Would You Use Patch"><meta data-rh="true" property="og:description" content="Why Would You Use Patch"><link data-rh="true" rel="icon" href="/img/favicon.ico"><link data-rh="true" rel="canonical" href="https://docs.datahub.com/docs/advanced/patch"><link data-rh="true" rel="alternate" href="https://docs.datahub.com/docs/advanced/patch" hreflang="en"><link data-rh="true" rel="alternate" href="https://docs.datahub.com/docs/advanced/patch" hreflang="x-default"><link data-rh="true" rel="preconnect" href="https://RK0UG797F3-dsn.algolia.net" crossorigin="anonymous"><link rel="alternate" type="application/rss+xml" href="/learn/rss.xml" title="DataHub RSS Feed">
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<div role="region" aria-label="Skip to main content"><a class="skipToContent_fXgn" href="#__docusaurus_skipToContent_fallback">Skip to main content</a></div><div class="announcementBar_mb4j" style="background-color:transparent;color:#ffffff" role="banner"><div class="content_knG7 announcementBarContent_xLdY"><div class="shimmer-banner"><p>DataHub Secures $35 Million Series B</p><a href="https://datahub.com/news/series-b-announcement/" target="_blank" class="button"><div>Read the announcement<span> →</span></div></a></div></div></div><nav aria-label="Main" class="navbar navbar--fixed-top"><div class="navbar__inner"><div class="navbar__items"><button aria-label="Toggle navigation bar" aria-expanded="false" class="navbar__toggle clean-btn" type="button"><svg width="30" height="30" viewBox="0 0 30 30" aria-hidden="true"><path stroke="currentColor" stroke-linecap="round" stroke-miterlimit="10" stroke-width="2" d="M4 7h22M4 15h22M4 23h22"></path></svg></button><a href="https://datahub.com" target="_blank" rel="noopener noreferrer" class="navbar__brand"><div class="navbar__logo"><img src="/img/datahub-logo-color-light-horizontal.svg" alt="DataHub Logo" class="themedImage_ToTc themedImage--light_HNdA"><img src="/img/datahub-logo-color-dark-horizontal.svg" alt="DataHub Logo" class="themedImage_ToTc themedImage--dark_i4oU"></div></a><div class="navbar__item dropdown dropdown--hoverable"><a href="#" aria-haspopup="true" aria-expanded="false" role="button" class="navbar__link versionNavItem_cbn8">Next</a><ul class="dropdown__menu"><li><a aria-current="page" class="dropdown__link dropdown__link--active" href="/docs/advanced/patch">Next</a></li><li><a class="dropdown__link" href="/docs/1.1.0/advanced/patch">1.1.0</a></li><li><hr class="dropdown-separator" style="margin: 0.4rem;"></li><li><div class="dropdown__link"><b>Archived versions</b></div></li><li>
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<a class="dropdown__link" href="https://docs-website-t9sv4w3gr-acryldata.vercel.app/docs/0.15.0/features">0.15.0
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<a class="dropdown__link" href="https://docs-website-8jkm4uler-acryldata.vercel.app/docs/0.14.1/features">0.14.1
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<svg width="12" height="12" aria-hidden="true" viewBox="0 0 24 24"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg>
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<a class="dropdown__link" href="https://docs-website-1gv2yzn9d-acryldata.vercel.app/docs/features">0.10.5
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<svg width="12" height="12" aria-hidden="true" viewBox="0 0 24 24"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg>
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</li></ul></div></div><div class="navbar__items navbar__items--right"><a aria-current="page" class="navbar__item navbar__link navbar__link--active" href="/docs">Docs</a><a class="navbar__item navbar__link" href="/integrations">Integrations</a><div class="navbar__item dropdown dropdown--hoverable"><a href="#" aria-haspopup="true" aria-expanded="false" role="button" class="navbar__link">Learn</a><ul class="dropdown__menu dropdown__menu_Z8FC"><div class="wrapper_kp81"><div><a href="https://datahub.com/weekly-demo" target="_blank" rel="noopener noreferrer" class="card_BUD7"><div class="icon_BgHd"><img src="/img/icon-join-slack.png" alt="Weekly Demo"></div><div class="title_c7DP">Weekly Demo</div></a></div><div><a href="https://datahub.com/use-cases" target="_blank" rel="noopener noreferrer" class="card_BUD7"><div class="icon_BgHd"><img src="/img/icon-forum.png" alt="Use Cases"></div><div class="title_c7DP">Use Cases</div></a></div><div><a href="httpps://datahub.com/adoption-stories" target="_blank" rel="noopener noreferrer" class="card_BUD7"><div class="icon_BgHd"><img src="/img/icon-events.png" alt="Adoption Stories"></div><div class="title_c7DP">Adoption Stories</div></a></div><div><a href="https://medium.com/datahub-project" target="_blank" rel="noopener noreferrer" class="card_BUD7"><div class="icon_BgHd"><img src="/img/icon-champions.png" alt="Blog"></div><div class="title_c7DP">Blog</div></a></div><div><a href="https://www.youtube.com/channel/UC3qFQC5IiwR5fvWEqi_tJ5w" target="_blank" rel="noopener noreferrer" class="card_BUD7"><div class="icon_BgHd"><img src="/img/icon-share-your-journey.png" alt="Youtube"></div><div class="title_c7DP">Youtube</div></a></div></div></ul></div><div class="navbar__item dropdown dropdown--hoverable"><a href="#" aria-haspopup="true" aria-expanded="false" role="button" class="navbar__link">Community</a><ul class="dropdown__menu dropdown__menu_Z8FC"><div class="wrapper_kp81"><div><a href="https://datahub.com/slack/" target="_blank" rel="noopener noreferrer" class="card_BUD7"><div class="icon_BgHd"><img src="/img/icon-join-slack.png" alt="Join Slack"></div><div class="title_c7DP">Join Slack</div></a></div><div><a href="https://datahub.com/events" target="_blank" rel="noopener noreferrer" class="card_BUD7"><div class="icon_BgHd"><img src="/img/icon-events.png" alt="Events"></div><div class="title_c7DP">Events</div></a></div><div><a href="https://datahub.com/champions/" target="_blank" rel="noopener noreferrer" class="card_BUD7"><div class="icon_BgHd"><img src="/img/icon-champions.png" alt="Champions"></div><div class="title_c7DP">Champions</div></a></div><div><a href="https://datahub.com/share-your-journey/" target="_blank" rel="noopener noreferrer" class="card_BUD7"><div class="icon_BgHd"><img src="/img/icon-share-your-journey.png" alt="Share Your Journey"></div><div class="title_c7DP">Share Your Journey</div></a></div></div></ul></div><a href="https://datahub.com/products/why-datahub-cloud/" target="_blank" rel="noopener noreferrer" class="navbar__item navbar__link">
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<style>
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.cloud-cta {
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color: var(--ifm-menu-color-active);
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font-weight: 600;
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background: linear-gradient(40deg, var(--ifm-menu-color-active), var(--ifm-menu-color-active));
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background-size: 200% 100%;
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-webkit-background-clip: text;
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background-clip: text;
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transition: background-image 0.3s ease;
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}
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.cloud-cta:hover {
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color: transparent;
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background: linear-gradient(40deg, var(--ifm-menu-color-active), #ff1493);
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background-size: 200% 100%;
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-webkit-background-clip: text;
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background-clip: text;
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animation: gradientShift 3s ease infinite;
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}
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@keyframes gradientShift {
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0%, 100% { background-position: 0% 50%; }
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50% { background-position: 100% 50%; }
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}
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</style>
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<div class="cloud-cta">Get Cloud</div>
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</a><a href="https://datahub.com/slack?utm_source=docs&utm_medium=header&utm_campaign=docs_header" target="_blank" rel="noopener noreferrer" class="navbar__item navbar__link">
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<style>
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.slack-logo:hover {
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opacity: 0.8;
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}
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</style>
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<img class="slack-logo" src="https://upload.wikimedia.org/wikipedia/commons/d/d5/Slack_icon_2019.svg" , alt="slack" , height="20px" style="margin: 10px 0 0 0;">
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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"><aside class="theme-doc-sidebar-container docSidebarContainer_b6E3"><div class="sidebarViewport_Xe31"><div class="sidebar_njMd"><nav aria-label="Docs sidebar" class="menu thin-scrollbar menu_SIkG menuWithAnnouncementBar_GW3s"><ul class="theme-doc-sidebar-menu menu__list"><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menuHtmlItem_M9Kj menu__list-item"><div>Getting Started</div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" href="/docs/features">What Is DataHub?</a><button aria-label="Toggle the collapsible sidebar category 'What Is DataHub?'" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" href="/docs/category/features">Features</a><button aria-label="Toggle the collapsible sidebar category 'Features'" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menuHtmlItem_M9Kj menu__list-item"><div>DataHub Cloud</div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/docs/managed-datahub/managed-datahub-overview">DataHub Cloud Overview</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/docs/managed-datahub/welcome-acryl">Getting Started with DataHub Cloud</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="/docs/authentication/guides/sso/initialize-oidc">Configure Single Sign-On</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="/docs/managed-datahub/remote-executor/about">Remote Executor</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="/docs/managed-datahub/datahub-api/entity-events-api">DataHub API</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--subli
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This means that when you want to change even a single field within an aspect without modifying others, you need to do a read-modify-write to avoid overwriting existing fields.
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To support these scenarios, DataHub supports <code>PATCH</code> operations to perform targeted changes for individual fields or values within arrays of fields are possible without impacting other existing metadata.</p><div class="theme-admonition theme-admonition-note alert alert--secondary admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M6.3 5.69a.942.942 0 0 1-.28-.7c0-.28.09-.52.28-.7.19-.18.42-.28.7-.28.28 0 .52.09.7.28.18.19.28.42.28.7 0 .28-.09.52-.28.7a1 1 0 0 1-.7.3c-.28 0-.52-.11-.7-.3zM8 7.99c-.02-.25-.11-.48-.31-.69-.2-.19-.42-.3-.69-.31H6c-.27.02-.48.13-.69.31-.2.2-.3.44-.31.69h1v3c.02.27.11.5.31.69.2.2.42.31.69.31h1c.27 0 .48-.11.69-.31.2-.19.3-.42.31-.69H8V7.98v.01zM7 2.3c-3.14 0-5.7 2.54-5.7 5.68 0 3.14 2.56 5.7 5.7 5.7s5.7-2.55 5.7-5.7c0-3.15-2.56-5.69-5.7-5.69v.01zM7 .98c3.86 0 7 3.14 7 7s-3.14 7-7 7-7-3.12-7-7 3.14-7 7-7z"></path></svg></span>note</div><div class="admonitionContent_S0QG"><p>Currently, PATCH support is only available for a selected set of aspects, so before pinning your hopes on using PATCH as a way to make modifications to aspect values, confirm whether your aspect supports PATCH semantics. The complete list of Aspects that are supported are maintained <a href="https://github.com/datahub-project/datahub/blob/9588440549f3d99965085e97b214a7dabc181ed2/entity-registry/src/main/java/com/linkedin/metadata/models/registry/template/AspectTemplateEngine.java#L24" target="_blank" rel="noopener noreferrer">here</a>.</p></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="how-to-use-patches">How To Use Patches<a href="#how-to-use-patches" class="hash-link" aria-label="Direct link to How To Use Patches" title="Direct link to How To Use Patches"></a></h2><p>Here's how to find the appropriate classes for the language for your choice.</p><div class="tabs-container tabList__CuJ"><ul role="tablist" aria-orientation="horizontal" class="tabs"><li role="tab" tabindex="0" aria-selected="true" class="tabs__item tabItem_LNqP tabs__item--active">Python SDK</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">Java SDK</li></ul><div class="margin-top--md"><div role="tabpanel" class="tabItem_Ymn6"><p>The Python Patch builders are entity-oriented and located in the <a href="https://github.com/datahub-project/datahub/tree/9588440549f3d99965085e97b214a7dabc181ed2/metadata-ingestion/src/datahub/specific" target="_blank" rel="noopener noreferrer">metadata-ingestion</a> module and located in the <code>datahub.specific</code> module.
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Patch builder helper classes exist for</p><ul><li><a href="https://github.com/datahub-project/datahub/blob/master/metadata-ingestion/src/datahub/specific/dataset.py" target="_blank" rel="noopener noreferrer">Datasets</a></li><li><a href="https://github.com/datahub-project/datahub/blob/master/metadata-ingestion/src/datahub/specific/chart.py" target="_blank" rel="noopener noreferrer">Charts</a></li><li><a href="https://github.com/datahub-project/datahub/blob/master/metadata-ingestion/src/datahub/specific/dashboard.py" target="_blank" rel="noopener noreferrer">Dashboards</a></li><li><a href="https://github.com/datahub-project/datahub/blob/master/metadata-ingestion/src/datahub/specific/datajob.py" target="_blank" rel="noopener noreferrer">Data Jobs (Tasks)</a></li><li><a href="https://github.com/datahub-project/datahub/blob/master/metadata-ingestion/src/datahub/specific/dataproduct.py" target="_blank" rel="noopener noreferrer">Data Products</a></li></ul><p>And we are gladly accepting contributions for Containers, Data Flows (Pipelines), Tags, Glossary Terms, Domains, and ML Models.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="add--remove-owners-for-dataset">Add & Remove Owners for Dataset<a href="#add--remove-owners-for-dataset" class="hash-link" aria-label="Direct link to Add & Remove Owners for Dataset" title="Direct link to Add & Remove Owners for Dataset"></a></h3><p>To add & remove specific owners for a dataset:</p><div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Inlined from /metadata-ingestion/examples/library/dataset_add_owner_patch.py</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> datahub</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">emitter</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">mce_builder </span><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> make_dataset_urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> make_group_urn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> make_user_urn</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> datahub</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">ingestion</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">graph</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">client </span><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> DataHubGraph</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> DataHubGraphConfig</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token keyword" style="font-style:italic">from</span><span class="token plain"> datahub</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">metadata</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">schema_classes </span><span class="token keyword" style="font-style:italic">import</span><span class="token plain"> OwnerClass</
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which can be reasoned about as JSON representations of the object models. To be able to patch these we utilize <a href="https://jsonpatch.com/" target="_blank" rel="noopener noreferrer">JsonPatch</a>. The components of a JSON Patch are the path, operation, and value.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="path">Path<a href="#path" class="hash-link" aria-label="Direct link to Path" title="Direct link to Path"></a></h3><p>The JSON path refers to a value within the schema. This can be a single field or can be an entire object reference depending on what the path is.
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For our patches we are primarily targeting single fields or even single array elements within a field. To be able to target array elements by id, we go through a translation process
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of the schema to transform arrays into maps. This allows a path to reference a particular array element by key rather than by index, for example a specific tag urn being added to a dataset.</p><h4 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></h4><p>A patch path for targeting an upstream dataset:</p><p><code>/upstreams/urn:li:dataset:(urn:li:dataPlatform:hive,fct_users_created_upstream,PROD)</code></p><p>Breakdown:</p><ul><li><code>/upstreams</code> -> References the upstreams field of the UpstreamLineage aspect, this is an array of Upstream objects where the key is the Urn</li><li><code>/urn:...</code> -> The dataset to be targeted by the operation</li></ul><p>A patch path for targeting a fine-grained lineage upstream:</p><p><code>/fineGrainedLineages/TRANSFORM/urn:li:schemaField:(urn:li:dataset:(urn:li:dataPlatform:hive,fct_users_created,PROD),foo)/urn:li:query:queryId/urn:li:schemaField:(urn:li:dataset:(urn:li:dataPlatform:hive,fct_users_created_upstream,PROD),bar)</code></p><p>Breakdown:</p><ul><li><code>/fineGrainedLineages</code> -> References the fineGrainedLineages field on an UpstreamLineage, this is an array of FineGrainedLineage objects keyed on transformOperation, downstream urn, and query urn</li><li><code>/TRANSFORM</code> -> transformOperation, one of the fields determining the key for a fineGrainedLineage</li><li><code>/urn:li:schemaField:...</code> -> The downstream schemaField referenced in this schema, part of the key for a fineGrainedLineage</li><li><code>/urn:li:query:...</code> -> The query urn this relationship was derived from, part of the key for a fineGrainedLineage</li><li><code>/urn:li:schemaField:</code> -> The upstream urn that is being targeted by this patch operation</li></ul><p>This showcases that in some cases the key for objects is simple, in others in can be complex to determine, but for our fully supported use cases we have
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SDK support on both the Java and Python side that will generate these patches for you as long as you supply the required method parameters.
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Path is generally the most complicated portion of a patch to reason about as it requires intimate knowledge of the schema and models.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="operation">Operation<a href="#operation" class="hash-link" aria-label="Direct link to Operation" title="Direct link to Operation"></a></h3><p>Operation is a limited enum of a few supported types pulled directly from the JSON Patch spec. DataHub only supports <code>ADD</code> and <code>REMOVE</code> of these options
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as the other patch operations do not currently have a use case within our system.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="add">Add<a href="#add" class="hash-link" aria-label="Direct link to Add" title="Direct link to Add"></a></h4><p>Add is a bit of a misnomer for the JSON Patch spec, it is not an explicit add but an upsert/replace. If the path specified does not exist, it will be created,
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but if the path already exists the value will be replaced. Patch operations apply at a path level so it is possible to do full replaces of arrays or objects in the schema
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using adds, but generally the most useful use case for patch is to add elements to arrays without affecting the other elements as full upserts are supported by standard ingestion.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="remove">Remove<a href="#remove" class="hash-link" aria-label="Direct link to Remove" title="Direct link to Remove"></a></h4><p>Remove operations require the path specified to be present, or an error will be thrown, otherwise they operate as one would expect. The specified path will be removed from the aspect.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="value">Value<a href="#value" class="hash-link" aria-label="Direct link to Value" title="Direct link to Value"></a></h3><p>Value is the actual information that will be stored at a path. If the path references an object then this will include the JSON key value pairs for that object.</p><h4 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></h4><p>An example UpstreamLineage object value:</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">"auditStamp"</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)">0</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:unknown"</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">"dataset"</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:s3,my-bucket/my-folder/my-file.txt,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">"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)">"TRANSFORMED"</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="b
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This specifies the required fields to properly represent that object. Note: by modifying this path, you could reference a single field within the UpstreamLineage object itself, like so:</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">"path"</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)">"/upstreams/urn:li:dataset:(urn:li:dataPlatform:hive,fct_users_created_upstream,PROD)/type"</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">"op"</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)">"ADD"</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)">"VIEW"</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><h3 class="anchor anchorWithStickyNavbar_LWe7" id="implementation-details">Implementation details<a href="#implementation-details" class="hash-link" aria-label="Direct link to Implementation details" title="Direct link to Implementation details"></a></h3><h4 class="anchor anchorWithStickyNavbar_LWe7" id="template-classes">Template Classes<a href="#template-classes" class="hash-link" aria-label="Direct link to Template Classes" title="Direct link to Template Classes"></a></h4><p>Template classes are the mechanism that maps fields to their corresponding JSON paths. Since DataMaps are not true JSON, first we convert a RecordTemplate to a JSON String,
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perform any additional process to map array fields to their keys, apply the patch, and then convert the JSON object back to a RecordTemplate to work with the rest of the application.</p><p>The template classes we currently support can be found in the <code>entity-registry</code> module. They are split up by aspect, with the GenericTemplate applying to any non-directly supported aspects.
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The GenericTemplate allows for use cases that we have not gotten around to directly support yet, but puts more burden on the user to generate patches correctly.</p><p>The template classes are utilized in <code>EntityServiceImpl</code> where a MCP is determined to be either a patch or standard upsert which then routes through to the stored templates registered on the EntityRegistry.
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The core logical flow each Template runs through is set up in the <code>Template</code> interface, with some more specific logic in the lower level interfaces for constructing/deconstructing array field keys.
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Most of the complexity around these classes is knowledge of schema and JSON path traversals.</p><h5 class="anchor anchorWithStickyNavbar_LWe7" id="arraymergingtemplate--compoundkeytemplate">ArrayMergingTemplate & CompoundKeyTemplate<a href="#arraymergingtemplate--compoundkeytemplate" class="hash-link" aria-label="Direct link to ArrayMergingTemplate & CompoundKeyTemplate" title="Direct link to ArrayMergingTemplate & CompoundKeyTemplate"></a></h5><p><code>ArrayMergingTemplate</code> is utilized for any aspect which has array fields and may either be used directly or use <code>CompoundKeyTemplate</code>. <code>ArrayMergingTemplate</code> is the simpler one that can only be used directly for
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single value keys. <code>CompoundKeyTemplate</code> allows for support of multi-field keys. For more complex examples like FineGrainedLineage, further logic is needed to construct a key as it is not generalizable to other aspects, see <code>UpstreamLineageTemplate</code> for full special case implementation.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="patchbuilders">PatchBuilders<a href="#patchbuilders" class="hash-link" aria-label="Direct link to PatchBuilders" title="Direct link to PatchBuilders"></a></h4><p>There are patch builder SDK classes for constructing patches in both Java and Python. The Java patch builders all extend <code>AbstractMultiFieldPatchBuilder</code> which sets up the
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base functionality for patch builder subtypes. Each implementation of this abstract class is targeted at a particular aspect and contains specific field based update methods
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for the most common use cases. On the Python side patch builders live in the <code>src/specific/</code> directory and are organized by entity type.</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="slackUtm_uoBr"><div class="slackUtm_uoBr"><hr>Need more help? Join the conversation in <a href="https://datahub.com/slack?utm_source=docs&utm_medium=footer&utm_campaign=docs_footer&utm_content=docs/advanced/patch">Slack!</a></div></div><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/datahub-project/datahub/blob/master/docs/advanced/patch.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_VsjB"></div></div></footer><div class="feedbackWrapper_mUHF"><div class="feedbackWidget_PX4d"><div class="feedbackButtons_wn3V"><strong>Is this page helpful?</strong><div><button class="feedbackButton_UgQs"><span role="img" aria-label="like" class="anticon anticon-like"><svg viewBox="64 64 896 896" focusable="false" data-icon="like" width="1em" height="1em" fill="currentColor" aria-hidden="true"><path d="M885.9 533.7c16.8-22.2 26.1-49.4 26.1-77.7 0-44.9-25.1-87.4-65.5-111.1a67.67 67.67 0 00-34.3-9.3H572.4l6-122.9c1.4-29.7-9.1-57.9-29.5-79.4A106.62 106.62 0 00471 99.9c-52 0-98 35-111.8 85.1l-85.9 311H144c-17.7 0-32 14.3-32 32v364c0 17.7 14.3 32 32 32h601.3c9.2 0 18.2-1.8 26.5-5.4 47.6-20.3 78.3-66.8 78.3-118.4 0-12.6-1.8-25-5.4-37 16.8-22.2 26.1-49.4 26.1-77.7 0-12.6-1.8-25-5.4-37 16.8-22.2 26.1-49.4 26.1-77.7-.2-12.6-2-25.1-5.6-37.1zM184 852V568h81v284h-81zm636.4-353l-21.9 19 13.9 25.4a56.2 56.2 0 016.9 27.3c0 16.5-7.2 32.2-19.6 43l-21.9 19 13.9 25.4a56.2 56.2 0 016.9 27.3c0 16.5-7.2 32.2-19.6 43l-21.9 19 13.9 25.4a56.2 56.2 0 016.9 27.3c0 22.4-13.2 42.6-33.6 51.8H329V564.8l99.5-360.5a44.1 44.1 0 0142.2-32.3c7.6 0 15.1 2.2 21.1 6.7 9.9 7.4 15.2 18.6 14.6 30.5l-9.6 198.4h314.4C829 418.5 840 436.9 840 456c0 16.5-7.2 32.1-19.6 43z"></path></svg></span></button><button class="feedbackButton_UgQs"><span role="img" aria-label="dislike" class="anticon anticon-dislike"><svg viewBox="64 64 896 896" focusable="false" data-icon="dislike" width="1em" height="1em" fill="currentColor" aria-hidden="true"><path d="M885.9 490.3c3.6-12 5.4-24.4 5.4-37 0-28.3-9.3-55.5-26.1-77.7 3.6-12 5.4-24.4 5.4-37 0-28.3-9.3-55.5-26.1-77.7 3.6-12 5.4-24.4 5.4-37 0-51.6-30.7-98.1-78.3-118.4a66.1 66.1 0 00-26.5-5.4H144c-17.7 0-32 14.3-32 32v364c0 17.7 14.3 32 32 32h129.3l85.8 310.8C372.9 889 418.9 924 470.9 924c29.7 0 57.4-11.8 77.9-33.4 20.5-21.5 31-49.7 29.5-79.4l-6-122.9h239.9c12.1 0 23.9-3.2 34.3-9.3 40.4-23.5 65.5-66.1 65.5-111 0-28.3-9.3-55.5-26.1-77.7zM184 456V172h81v284h-81zm627.2 160.4H496.8l9.6 198.4c.6 11.9-4.7 23.1-14.6 30.5-6.1 4.5-13.6 6.8-21.1 6.7a44.28 44.28 0 01-42.2-32.3L329 459.2V172h415.4a56.85 56.85 0 0133.6 51.8c0 9.7-2.3 18.9-6.9 27.3l-13.9 25.4 21.9 19a56.76 56.76 0 0119.6 43c0 9.7-2.3 18.9-6.9 27.3l-13.9 25.4 21.9 19a56.76 56.76 0 0119.6 43c0 9.7-2.3 18.9-6.9 27.3l-14 25.5 21.9 19a56.76 56.76 0 0119.6 43c0 19.1-11 37.5-28.8 48.4z"></path></svg></span></button></div></div></div></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/api/tutorials/terms"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Terms</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/api/tutorials/sdk/search_client"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Search</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
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