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padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 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 class="breadcrumbs__item"><span class="breadcrumbs__link">Operations</span><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">Rolling updates</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>Rolling updates</h1></header><p>For rolling Apache Druid cluster updates with no downtime, we recommend updating Druid processes in the |
| following order:</p><ol><li>Historical</li><li>Middle Manager and Indexer (if any)</li><li>Broker</li><li>Router</li><li>Overlord (Note that you can upgrade the Overlord before any MiddleManager processes if you use <a href="#autoscaling-based-replacement">autoscaling-based replacement</a>.)</li><li>Coordinator ( or merged Coordinator+Overlord )</li></ol><p>If you need to do a rolling downgrade, reverse the order and start with the Coordinator processes.</p><p>For information about the latest release, see <a href="https://github.com/apache/druid/releases" target="_blank" rel="noopener noreferrer">Druid releases</a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="historical">Historical<a href="#historical" class="hash-link" aria-label="Direct link to Historical" title="Direct link to Historical"></a></h2><p>Historical processes can be updated one at a time. Each Historical process has a startup time to memory map |
| all the segments it was serving before the update. The startup time typically takes a few seconds to |
| a few minutes, depending on the hardware of the host. As long as each Historical process is updated |
| with a sufficient delay (greater than the time required to start a single process), you can rolling |
| update the entire Historical cluster.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="overlord">Overlord<a href="#overlord" class="hash-link" aria-label="Direct link to Overlord" title="Direct link to Overlord"></a></h2><p>Overlord processes can be updated one at a time in a rolling fashion.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="middle-managersindexers">Middle Managers/Indexers<a href="#middle-managersindexers" class="hash-link" aria-label="Direct link to Middle Managers/Indexers" title="Direct link to Middle Managers/Indexers"></a></h2><p>Middle Managers or Indexer nodes run both batch and real-time indexing tasks. Generally you want to update Middle |
| Managers in such a way that real-time indexing tasks do not fail. There are three strategies for |
| doing that.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="rolling-restart-restore-based">Rolling restart (restore-based)<a href="#rolling-restart-restore-based" class="hash-link" aria-label="Direct link to Rolling restart (restore-based)" title="Direct link to Rolling restart (restore-based)"></a></h3><p>Middle Managers can be updated one at a time in a rolling fashion when you set |
| <code>druid.indexer.task.restoreTasksOnRestart=true</code>. In this case, indexing tasks that support restoring |
| will restore their state on Middle Manager restart, and will not fail.</p><p>Currently, only realtime tasks support restoring, so non-realtime indexing tasks will fail and will |
| need to be resubmitted.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="rolling-restart-graceful-termination-based">Rolling restart (graceful-termination-based)<a href="#rolling-restart-graceful-termination-based" class="hash-link" aria-label="Direct link to Rolling restart (graceful-termination-based)" title="Direct link to Rolling restart (graceful-termination-based)"></a></h3><p>Middle Managers can be gracefully terminated using the "disable" API. This works for all task types, |
| even tasks that are not restorable.</p><p>To prepare a Middle Manager for update, send a POST request to |
| <code><MiddleManager_IP:PORT>/druid/worker/v1/disable</code>. The Overlord will now no longer send tasks to |
| this Middle Manager. Tasks that have already started will run to completion. Current state can be checked |
| using <code><MiddleManager_IP:PORT>/druid/worker/v1/enabled</code> .</p><p>To view all existing tasks, send a GET request to <code><MiddleManager_IP:PORT>/druid/worker/v1/tasks</code>. |
| When this list is empty, you can safely update the Middle Manager. After the Middle Manager starts |
| back up, it is automatically enabled again. You can also manually enable Middle Managers by POSTing |
| to <code><MiddleManager_IP:PORT>/druid/worker/v1/enable</code>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="autoscaling-based-replacement">Autoscaling-based replacement<a href="#autoscaling-based-replacement" class="hash-link" aria-label="Direct link to Autoscaling-based replacement" title="Direct link to Autoscaling-based replacement"></a></h3><p>If autoscaling is enabled on your Overlord, then Overlord processes can launch new Middle Manager processes |
| en masse and then gracefully terminate old ones as their tasks finish. This process is configured by |
| setting <code>druid.indexer.runner.minWorkerVersion=#{VERSION}</code>. Each time you update your Overlord process, |
| the <code>VERSION</code> value should be increased, which will trigger a mass launch of new Middle Managers.</p><p>The config <code>druid.indexer.autoscale.workerVersion=#{VERSION}</code> also needs to be set.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="standalone-real-time">Standalone Real-time<a href="#standalone-real-time" class="hash-link" aria-label="Direct link to Standalone Real-time" title="Direct link to Standalone Real-time"></a></h2><p>Standalone real-time processes can be updated one at a time in a rolling fashion.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="broker">Broker<a href="#broker" class="hash-link" aria-label="Direct link to Broker" title="Direct link to Broker"></a></h2><p>Broker processes can be updated one at a time in a rolling fashion. There needs to be some delay between |
| updating each process as Brokers must load the entire state of the cluster before they return valid |
| results.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="coordinator">Coordinator<a href="#coordinator" class="hash-link" aria-label="Direct link to Coordinator" title="Direct link to Coordinator"></a></h2><p>Coordinator processes can be updated one at a time in a rolling fashion.</p></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/operations/high-availability"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">High availability</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/latest/operations/rule-configuration"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Using rules to drop and retain data</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="#historical" class="table-of-contents__link toc-highlight">Historical</a></li><li><a href="#overlord" class="table-of-contents__link toc-highlight">Overlord</a></li><li><a href="#middle-managersindexers" class="table-of-contents__link toc-highlight">Middle Managers/Indexers</a><ul><li><a href="#rolling-restart-restore-based" class="table-of-contents__link toc-highlight">Rolling restart (restore-based)</a></li><li><a href="#rolling-restart-graceful-termination-based" class="table-of-contents__link toc-highlight">Rolling restart (graceful-termination-based)</a></li><li><a href="#autoscaling-based-replacement" class="table-of-contents__link toc-highlight">Autoscaling-based replacement</a></li></ul></li><li><a href="#standalone-real-time" class="table-of-contents__link toc-highlight">Standalone Real-time</a></li><li><a href="#broker" class="table-of-contents__link toc-highlight">Broker</a></li><li><a href="#coordinator" class="table-of-contents__link toc-highlight">Coordinator</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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