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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">Design</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">ZooKeeper</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>ZooKeeper</h1></header><p>Apache Druid uses <a href="http://zookeeper.apache.org/" target="_blank" rel="noopener noreferrer">Apache ZooKeeper</a> (ZK) for management of current cluster state.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="minimum-zookeeper-versions">Minimum ZooKeeper versions<a href="#minimum-zookeeper-versions" class="hash-link" aria-label="Direct link to Minimum ZooKeeper versions" title="Direct link to Minimum ZooKeeper versions"></a></h2><p>Apache Druid supports ZooKeeper versions 3.5.x and above.</p><div class="theme-admonition theme-admonition-info alert alert--info admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"></path></svg></span>info</div><div class="admonitionContent_S0QG"><p> Note: Starting with Apache Druid 0.22.0, support for ZooKeeper 3.4.x has been removed</p></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="zookeeper-operations">ZooKeeper Operations<a href="#zookeeper-operations" class="hash-link" aria-label="Direct link to ZooKeeper Operations" title="Direct link to ZooKeeper Operations"></a></h2><p>The operations that happen over ZK are</p><ol><li><a href="/docs/latest/design/coordinator">Coordinator</a> leader election</li><li>Segment "publishing" protocol from <a href="/docs/latest/design/historical">Historical</a></li><li>Segment load/drop protocol between <a href="/docs/latest/design/coordinator">Coordinator</a> and <a href="/docs/latest/design/historical">Historical</a></li><li><a href="/docs/latest/design/overlord">Overlord</a> leader election</li><li><a href="/docs/latest/design/overlord">Overlord</a> and <a href="/docs/latest/design/middlemanager">MiddleManager</a> task management</li></ol><h2 class="anchor anchorWithStickyNavbar_LWe7" id="coordinator-leader-election">Coordinator Leader Election<a href="#coordinator-leader-election" class="hash-link" aria-label="Direct link to Coordinator Leader Election" title="Direct link to Coordinator Leader Election"></a></h2><p>We use the Curator <a href="https://curator.apache.org/curator-recipes/leader-latch.html" target="_blank" rel="noopener noreferrer">LeaderLatch</a> recipe to perform leader election at path</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">${druid.zk.paths.coordinatorPath}/_COORDINATOR</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="segment-publishing-protocol-from-historical-and-realtime">Segment "publishing" protocol from Historical and Realtime<a href="#segment-publishing-protocol-from-historical-and-realtime" class="hash-link" aria-label="Direct link to Segment "publishing" protocol from Historical and Realtime" title="Direct link to Segment "publishing" protocol from Historical and Realtime"></a></h2><p>The <code>announcementsPath</code> and <code>servedSegmentsPath</code> are used for this.</p><p>All <a href="/docs/latest/design/historical">Historical</a> processes publish themselves on the <code>announcementsPath</code>, specifically, they will create an ephemeral znode at</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">${druid.zk.paths.announcementsPath}/${druid.host}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Which signifies that they exist. They will also subsequently create a permanent znode at</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">${druid.zk.paths.servedSegmentsPath}/${druid.host}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>And as they load up segments, they will attach ephemeral znodes that look like</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">${druid.zk.paths.servedSegmentsPath}/${druid.host}/_segment_identifier_</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Processes like the <a href="/docs/latest/design/coordinator">Coordinator</a> and <a href="/docs/latest/design/broker">Broker</a> can then watch these paths to see which processes are currently serving which segments.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="segment-loaddrop-protocol-between-coordinator-and-historical">Segment load/drop protocol between Coordinator and Historical<a href="#segment-loaddrop-protocol-between-coordinator-and-historical" class="hash-link" aria-label="Direct link to Segment load/drop protocol between Coordinator and Historical" title="Direct link to Segment load/drop protocol between Coordinator and Historical"></a></h2><p>The <code>loadQueuePath</code> is used for this.</p><p>When the <a href="/docs/latest/design/coordinator">Coordinator</a> decides that a <a href="/docs/latest/design/historical">Historical</a> process should load or drop a segment, it writes an ephemeral znode to</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">${druid.zk.paths.loadQueuePath}/_host_of_historical_process/_segment_identifier</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>This znode will contain a payload that indicates to the Historical process what it should do with the given segment. When the Historical process is done with the work, it will delete the znode in order to signify to the Coordinator that it is complete.</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/design/metadata-storage"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Metadata storage</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/latest/ingestion/"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Overview</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="#minimum-zookeeper-versions" class="table-of-contents__link toc-highlight">Minimum ZooKeeper versions</a></li><li><a href="#zookeeper-operations" class="table-of-contents__link toc-highlight">ZooKeeper Operations</a></li><li><a href="#coordinator-leader-election" class="table-of-contents__link toc-highlight">Coordinator Leader Election</a></li><li><a href="#segment-publishing-protocol-from-historical-and-realtime" class="table-of-contents__link toc-highlight">Segment "publishing" protocol from Historical and Realtime</a></li><li><a href="#segment-loaddrop-protocol-between-coordinator-and-historical" class="table-of-contents__link toc-highlight">Segment load/drop protocol between Coordinator and Historical</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. 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