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markdown"><header><h1>Indexing Service</h1></header><p>The Apache Druid indexing service is a highly-available, distributed service that runs indexing related tasks.</p><p>Indexing <a href="/docs/latest/ingestion/tasks">tasks</a> are responsible for creating and <a href="/docs/latest/ingestion/tasks#kill">killing</a> Druid <a href="/docs/latest/design/segments">segments</a>.</p><p>The indexing service is composed of three main components: <a href="/docs/latest/design/peons">Peons</a> that can run a single task, <a href="/docs/latest/design/middlemanager">MiddleManagers</a> that manage Peons, and an <a href="/docs/latest/design/overlord">Overlord</a> that manages task distribution to MiddleManagers. |
| Overlords and MiddleManagers may run on the same process or across multiple processes, while MiddleManagers and Peons always run on the same process.</p><p>Tasks are managed using API endpoints on the Overlord service. Please see <a href="/docs/latest/api-reference/tasks-api">Tasks API</a> for more information.</p><p><img loading="lazy" alt="Indexing Service" src="/assets/images/indexing_service-e985270b9e0e342af71c0673407e5673.png" title="Indexing Service" width="532" height="621" class="img_ev3q"></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>See <a href="/docs/latest/design/overlord">Overlord</a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="middle-managers">Middle Managers<a href="#middle-managers" class="hash-link" aria-label="Direct link to Middle Managers" title="Direct link to Middle Managers"></a></h2><p>See <a href="/docs/latest/design/middlemanager">Middle Manager</a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="peons">Peons<a href="#peons" class="hash-link" aria-label="Direct link to Peons" title="Direct link to Peons"></a></h2><p>See <a href="/docs/latest/design/peons">Peon</a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="tasks">Tasks<a href="#tasks" class="hash-link" aria-label="Direct link to Tasks" title="Direct link to Tasks"></a></h2><p>See <a href="/docs/latest/ingestion/tasks">Tasks</a>.</p></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"></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="#overlord" class="table-of-contents__link toc-highlight">Overlord</a></li><li><a href="#middle-managers" class="table-of-contents__link toc-highlight">Middle Managers</a></li><li><a href="#peons" class="table-of-contents__link toc-highlight">Peons</a></li><li><a href="#tasks" class="table-of-contents__link toc-highlight">Tasks</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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