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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">High availability</span><meta itemprop="position" content="2"></li></ul></nav><div class="theme-doc-markdown markdown"><header><h1>High availability</h1></header><p>Apache ZooKeeper, metadata store, the coordinator, the overlord, and brokers are recommended to set up a high availability environment.</p><ul><li>For highly-available ZooKeeper, you will need a cluster of 3 or 5 ZooKeeper nodes. |
| We recommend either installing ZooKeeper on its own hardware, or running 3 or 5 Master servers (where overlords or coordinators are running) |
| and configuring ZooKeeper on them appropriately. See the <a href="https://zookeeper.apache.org/doc/current/zookeeperAdmin" target="_blank" rel="noopener noreferrer">ZooKeeper admin guide</a> for more details.</li><li>For highly-available metadata storage, we recommend MySQL or PostgreSQL with replication and failover enabled. |
| See <a href="https://www.mysql.com/products/enterprise/high_availability.html" target="_blank" rel="noopener noreferrer">MySQL Enterprise High Availability</a> and <a href="https://www.postgresql.org/docs/current/high-availability.html" target="_blank" rel="noopener noreferrer">PostgreSQL's High Availability, Load Balancing, and Replication</a> for more information.</li><li>For highly-available Apache Druid Coordinators and Overlords, we recommend to run multiple servers. |
| If they are all configured to use the same ZooKeeper cluster and metadata storage, |
| then they will automatically failover between each other as necessary. |
| Only one will be active at a time, but inactive servers will redirect to the currently active server.</li><li>Druid Brokers can be scaled out and all running servers will be active and queryable. |
| We recommend placing them behind a load balancer.</li></ul></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/alerts"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Alerts</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/latest/operations/rolling-updates"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Rolling updates</div></a></nav></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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