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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 itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/docs/latest/ingestion/"><span itemprop="name">Ingestion</span></a><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">Concurrent append and replace</span><meta itemprop="position" content="2"></li></ul></nav><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"><header><h1>Concurrent append and replace</h1></header><p>Concurrent append and replace safely replaces the existing data in an interval of a datasource while new data is being appended to that interval. One of the most common applications of this feature is appending new data (such as with streaming ingestion) to an interval while compaction of that interval is already in progress. Druid partitions the data ingested during this time using <code>dynamic</code> partitioning. The subsequent compaction run would partition the data into the granularity you specified in the compaction config.</p><p>To set up concurrent append and replace, use the context flag <code>useConcurrentLocks</code>. Druid will then determine the correct lock type for you, either append or replace. Although you can set the type of lock manually, we don't recommend it. </p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="update-compaction-config-to-use-concurrent-locks">Update compaction config to use concurrent locks<a href="#update-compaction-config-to-use-concurrent-locks" class="hash-link" aria-label="Direct link to Update compaction config to use concurrent locks" title="Direct link to Update compaction config to use concurrent locks"></a></h2><p>If you want to append data to a datasource while compaction is running, you need to enable concurrent append and replace for the datasource by updating the compaction settings.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="update-compaction-config-from-the-druid-web-console">Update compaction config from the Druid web-console<a href="#update-compaction-config-from-the-druid-web-console" class="hash-link" aria-label="Direct link to Update compaction config from the Druid web-console" title="Direct link to Update compaction config from the Druid web-console"></a></h3><p>In the <strong>Compaction config</strong> for a datasource, enable <strong>Use concurrent locks</strong>.</p><p>For details on accessing the compaction config in the UI, see <a href="/docs/latest/data-management/automatic-compaction#manage-auto-compaction-using-the-web-console">Enable automatic compaction with the web console</a>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="update-compaction-config-using-rest-api">Update compaction config using REST API<a href="#update-compaction-config-using-rest-api" class="hash-link" aria-label="Direct link to Update compaction config using REST API" title="Direct link to Update compaction config using REST API"></a></h3><p>Add the <code>taskContext</code> like you would any other automatic compaction setting through the API:</p><div class="language-shell codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-shell codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token function" style="color:rgb(130, 170, 255)">curl</span><span class="token plain"> --location --request POST </span><span class="token string" style="color:rgb(195, 232, 141)">'http://localhost:8081/druid/coordinator/v1/config/compaction'</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">--header </span><span class="token string" style="color:rgb(195, 232, 141)">'Content-Type: application/json'</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">--data-raw </span><span class="token string" style="color:rgb(195, 232, 141)">'{</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token string" style="color:rgb(195, 232, 141)"> "dataSource": "YOUR_DATASOURCE",</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token string" style="color:rgb(195, 232, 141)"> "taskContext": {</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token string" style="color:rgb(195, 232, 141)"> "useConcurrentLocks": true</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token string" style="color:rgb(195, 232, 141)"> }</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token string" style="color:rgb(195, 232, 141)">}'</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="use-concurrent-locks-in-ingestion-jobs">Use concurrent locks in ingestion jobs<a href="#use-concurrent-locks-in-ingestion-jobs" class="hash-link" aria-label="Direct link to Use concurrent locks in ingestion jobs" title="Direct link to Use concurrent locks in ingestion jobs"></a></h2><p>You also need to configure the ingestion job to allow concurrent locks.</p><p>You can provide the context parameter like any other parameter for ingestion jobs through the API or the UI.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="use-concurrent-locks-in-the-druid-web-console">Use concurrent locks in the Druid web-console<a href="#use-concurrent-locks-in-the-druid-web-console" class="hash-link" aria-label="Direct link to Use concurrent locks in the Druid web-console" title="Direct link to Use concurrent locks in the Druid web-console"></a></h3><p>As part of the <strong>Load data</strong> wizard for classic batch (JSON-based) ingestion and streaming ingestion, enable the following config on the <strong>Publish</strong> step: <strong>Use concurrent locks</strong>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="use-concurrent-locks-in-the-rest-apis">Use concurrent locks in the REST APIs<a href="#use-concurrent-locks-in-the-rest-apis" class="hash-link" aria-label="Direct link to Use concurrent locks in the REST APIs" title="Direct link to Use concurrent locks in the REST APIs"></a></h3><p>Add the following JSON snippet to your supervisor or ingestion spec if you're using the API:</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 property">"context"</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">"useConcurrentLocks"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token boolean" style="color:rgb(255, 88, 116)">true</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="update-overlord-properties-to-use-concurrent-locks-for-all-ingestion-and-compaction-jobs">Update Overlord properties to use concurrent locks for all ingestion and compaction jobs<a href="#update-overlord-properties-to-use-concurrent-locks-for-all-ingestion-and-compaction-jobs" class="hash-link" aria-label="Direct link to Update Overlord properties to use concurrent locks for all ingestion and compaction jobs" title="Direct link to Update Overlord properties to use concurrent locks for all ingestion and compaction jobs"></a></h2><p>Updating the compaction config and ingestion job for each data source can be cumbersome if you have several data sources in your cluster. You can instead set the following config in the <code>runtime.properties</code> of the Overlord service to use concurrent locks across all ingestion and compaction jobs.</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">druid.indexer.task.default.context</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token string" style="color:rgb(195, 232, 141)">"useConcurrentLocks"</span><span class="token plain">:true</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="task-lock-types">Task lock types<a href="#task-lock-types" class="hash-link" aria-label="Direct link to Task lock types" title="Direct link to Task lock types"></a></h2><p>We recommend that you use the <code>useConcurrentLocks</code> context parameter so that Druid automatically determines the task lock types for you. If, for some reason, you need to manually set the task lock types explicitly, you can read more about them in this section.</p><details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Click here to read more about the lock types.</summary><div><div class="collapsibleContent_i85q"><p>Druid uses task locks to make sure that multiple conflicting operations don't happen at once. |
| There are two task lock types: <code>APPEND</code> and <code>REPLACE</code>. The type of lock you use is determined by what you're trying to accomplish.</p><p>When setting task lock types manually, be aware of the following:</p><ul><li>The segment granularity of the append task must be equal to or finer than the segment granularity of the replace task.</li><li>Concurrent append and replace fails if the task with <code>APPEND</code> lock uses a coarser segment granularity than the task with the <code>REPLACE</code> lock. For example, if the <code>APPEND</code> task uses a segment granularity of YEAR and the <code>REPLACE</code> task uses a segment granularity of MONTH, you should not use concurrent append and replace.</li><li>Only a single task can hold a <code>REPLACE</code> lock on a given interval of a datasource.</li><li>Multiple tasks can hold <code>APPEND</code> locks on a given interval of a datasource and append data to that interval simultaneously.</li></ul><h4 class="anchor anchorWithStickyNavbar_LWe7" id="add-a-task-lock-type-to-your-ingestion-job">Add a task lock type to your ingestion job<a href="#add-a-task-lock-type-to-your-ingestion-job" class="hash-link" aria-label="Direct link to Add a task lock type to your ingestion job" title="Direct link to Add a task lock type to your ingestion job"></a></h4><p>You configure the task lock type for your ingestion job as follows:</p><ul><li>For streaming jobs, the <code>taskLockType</code> context parameter goes in your supervisor spec, and the lock type is always <code>APPEND</code>.</li><li>For classic JSON-based batch ingestion, the <code>taskLockType</code> context parameter goes in your ingestion spec, and the lock type can be either <code>APPEND</code> or <code>REPLACE</code>. </li></ul><p>You can provide the context parameter through the API like any other parameter for ingestion job or through the UI.</p><h5 class="anchor anchorWithStickyNavbar_LWe7" id="add-a-task-lock-using-the-druid-console">Add a task lock using the Druid console<a href="#add-a-task-lock-using-the-druid-console" class="hash-link" aria-label="Direct link to Add a task lock using the Druid console" title="Direct link to Add a task lock using the Druid console"></a></h5><p>As part of the <strong>Load data</strong> wizard for classic batch (JSON-based ingestion) and streaming ingestion, you can configure the task lock type for the ingestion during the <strong>Publish</strong> step:</p><ul><li>If you set <strong>Append to existing</strong> to <strong>True</strong>, you can then set <strong>Allow concurrent append tasks (experimental)</strong> to <strong>True</strong>.</li><li>If you set <strong>Append to existing</strong> to <strong>False</strong>, you can then set <strong>Allow concurrent replace tasks (experimental)</strong> to <strong>True</strong>.</li></ul><h5 class="anchor anchorWithStickyNavbar_LWe7" id="add-the-task-lock-type-through-the-api">Add the task lock type through the API<a href="#add-the-task-lock-type-through-the-api" class="hash-link" aria-label="Direct link to Add the task lock type through the API" title="Direct link to Add the task lock type through the API"></a></h5><p>Add the following JSON snippet to your supervisor or ingestion spec if you're using the API:</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 property">"context"</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">"taskLockType"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> LOCK_TYPE</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></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>The <code>LOCK_TYPE</code> depends on what you're trying to accomplish.</p><p>Set <code>taskLockType</code> to <code>APPEND</code> if either of the following are true:</p><ul><li>Dynamic partitioning with append to existing is set to <code>true</code></li><li>The ingestion job is a streaming ingestion job</li></ul><p>If you have multiple ingestion jobs that append all targeting the same datasource and want them to run simultaneously, you need to also include the following context parameter:</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 property">"useSharedLock"</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)">"true"</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>Keep in mind that <code>taskLockType</code> takes precedence over <code>useSharedLock</code>. Do not use <code>useSharedLock</code> with <code>REPLACE</code> task locks.</p><p>Set <code>taskLockType</code> to <code>REPLACE</code> if you're replacing data. For example, if you use any of the following partitioning types, use <code>REPLACE</code>:</p><ul><li>hash partitioning </li><li>range partitioning</li><li>dynamic partitioning with append to existing set to <code>false</code></li></ul></div></div></details></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/latest/ingestion/schema-design"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Schema design tips</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/latest/ingestion/faq"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Troubleshooting FAQ</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="#update-compaction-config-to-use-concurrent-locks" class="table-of-contents__link toc-highlight">Update compaction config to use concurrent locks</a><ul><li><a href="#update-compaction-config-from-the-druid-web-console" class="table-of-contents__link toc-highlight">Update compaction config from the Druid web-console</a></li><li><a href="#update-compaction-config-using-rest-api" class="table-of-contents__link toc-highlight">Update compaction config using REST API</a></li></ul></li><li><a href="#use-concurrent-locks-in-ingestion-jobs" class="table-of-contents__link toc-highlight">Use concurrent locks in ingestion jobs</a><ul><li><a href="#use-concurrent-locks-in-the-druid-web-console" class="table-of-contents__link toc-highlight">Use concurrent locks in the Druid web-console</a></li><li><a href="#use-concurrent-locks-in-the-rest-apis" class="table-of-contents__link toc-highlight">Use concurrent locks in the REST APIs</a></li></ul></li><li><a href="#update-overlord-properties-to-use-concurrent-locks-for-all-ingestion-and-compaction-jobs" class="table-of-contents__link toc-highlight">Update Overlord properties to use concurrent locks for all ingestion and compaction jobs</a></li><li><a href="#task-lock-types" class="table-of-contents__link toc-highlight">Task lock types</a></li></ul></div></div></div></div></main></div></div><footer class="footer"><div class="container container-fluid"><div class="footer__bottom text--center"><div class="margin-bottom--sm"><img src="/img/favicon.png" class="themedImage_ToTc themedImage--light_HNdA footer__logo"><img src="/img/favicon.png" class="themedImage_ToTc themedImage--dark_i4oU footer__logo"></div><div class="footer__copyright">Copyright © 2023 Apache Software Foundation. Except where otherwise noted, licensed under CC BY-SA 4.0. Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></div></footer></div> |
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