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class="search-icon" tabindex="0"></span><input type="search" id="search_input_react" placeholder="Loading..." aria-label="Search" class="navbar__search-input search-bar" disabled=""></div></div></div></div><div role="presentation" class="navbar-sidebar__backdrop"></div></nav><div id="__docusaurus_skipToContent_fallback" class="main-wrapper mainWrapper_z2l0 docsWrapper_BCFX"><button aria-label="Scroll back to top" class="clean-btn theme-back-to-top-button backToTopButton_sjWU" type="button"></button><div class="docPage__5DB"><main class="docMainContainer_gTbr docMainContainerEnhanced_Uz_u"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><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>MM-less Druid in K8s</h1></header><p>Apache Druid Extension to enable using Kubernetes for launching and managing tasks instead of the Middle Managers. This extension allows you to launch tasks as kubernetes jobs removing the need for your middle manager. </p><p>Consider this an <a href="/docs/26.0.0/development/experimental">EXPERIMENTAL</a> feature mostly because it has not been tested yet on a wide variety of long-running Druid clusters.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="how-it-works">How it works<a href="#how-it-works" class="hash-link" aria-label="Direct link to How it works" title="Direct link to How it works"></a></h2><p>The K8s extension builds a pod spec using the specified pod adapter, the default implementation takes the podSpec of your <code>Overlord</code> pod and creates a kubernetes job from this podSpec. Thus if you have sidecars such as Splunk or Istio it can optionally launch a task as a K8s job. All jobs are natively restorable, they are decoupled from the druid deployment, thus restarting pods or doing upgrades has no affect on tasks in flight. They will continue to run and when the overlord comes back up it will start tracking them again. </p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="pod-adapters">Pod Adapters<a href="#pod-adapters" class="hash-link" aria-label="Direct link to Pod Adapters" title="Direct link to Pod Adapters"></a></h2><p>The logic defining how the pod template is built for your kubernetes job depends on which pod adapter you have specified.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="overlord-single-container-pod-adapter">Overlord Single Container Pod Adapter<a href="#overlord-single-container-pod-adapter" class="hash-link" aria-label="Direct link to Overlord Single Container Pod Adapter" title="Direct link to Overlord Single Container Pod Adapter"></a></h3><p>The overlord single container pod adapter takes the podSpec of your <code>Overlord</code> pod and creates a kubernetes job from this podSpec. This is the default pod adapter implementation, to explicitly enable it you can specify the runtime property <code>druid.indexer.runner.k8s.adapter.type: overlordSingleContainer</code></p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="overlord-multi-container-pod-adapter">Overlord Multi Container Pod Adapter<a href="#overlord-multi-container-pod-adapter" class="hash-link" aria-label="Direct link to Overlord Multi Container Pod Adapter" title="Direct link to Overlord Multi Container Pod Adapter"></a></h3><p>The overlord multi container pod adapter takes the podSpec of your <code>Overlord</code> pod and creates a kubernetes job from this podSpec. It uses kubexit to manage dependency ordering between the main container that runs your druid peon and other sidecars defined in the <code>Overlord</code> pod spec. To enable this pod adapter you can specify the runtime property <code>druid.indexer.runner.k8s.adapter.type: overlordMultiContainer</code> </p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="custom-template-pod-adapter">Custom Template Pod Adapter<a href="#custom-template-pod-adapter" class="hash-link" aria-label="Direct link to Custom Template Pod Adapter" title="Direct link to Custom Template Pod Adapter"></a></h3><p>The custom template pod adapter allows you to specify a pod template file per task type. This adapter requires you to specify a <code>base</code> pod spec which will be used in the case that a task specific pod spec has not been defined. To enable this pod adapter you can specify the runtime property <code>druid.indexer.runner.k8s.adapter.type: customTemplateAdapter</code></p><p>The base pod template must be specified as the runtime property <code>druid.indexer.runner.k8s.podTemplate.base: /path/to/basePodSpec.yaml</code> |
| Task specific pod templates must be specified as the runtime property <code>druid.indexer.runner.k8s.podTemplate.{taskType}: /path/to/taskSpecificPodSpec.yaml</code> where {taskType} is the name of the task type i.e <code>index_parallel</code></p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="configuration">Configuration<a href="#configuration" class="hash-link" aria-label="Direct link to Configuration" title="Direct link to Configuration"></a></h2><p>To use this extension please make sure to <a href="/docs/26.0.0/development/extensions#loading-extensions">include</a><code>druid-kubernetes-overlord-extensions</code> in the extensions load list for your overlord process.</p><p>The extension uses the task queue to limit how many concurrent tasks (K8s jobs) are in flight so it is required you have a reasonable value for <code>druid.indexer.queue.maxSize</code>. Additionally set the variable <code>druid.indexer.runner.namespace</code> to the namespace in which you are running druid.</p><p>Other configurations required are: |
| <code>druid.indexer.runner.type: k8s</code> and <code>druid.indexer.task.encapsulatedTask: true</code></p><p>You can add optional labels to your K8s jobs / pods if you need them by using the following configuration: |
| <code>druid.indexer.runner.labels: '{"key":"value"}'</code> |
| Annotations are the same with: |
| <code>druid.indexer.runner.annotations: '{"key":"value"}'</code></p><p>All other configurations you had for the middle manager tasks must be moved under the overlord with one caveat, you must specify javaOpts as an array: |
| <code>druid.indexer.runner.javaOptsArray</code>, <code>druid.indexer.runner.javaOpts</code> is no longer supported.</p><p>If you are running without a middle manager you need to also use <code>druid.processing.intermediaryData.storage.type=deepstore</code></p><p>Additional Configuration</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="properties">Properties<a href="#properties" class="hash-link" aria-label="Direct link to Properties" title="Direct link to Properties"></a></h3><table><thead><tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th><th>required</th></tr></thead><tbody><tr><td><code>druid.indexer.runner.debugJobs</code></td><td><code>boolean</code></td><td>Clean up K8s jobs after tasks complete.</td><td>False</td><td>No</td></tr><tr><td><code>druid.indexer.runner.sidecarSupport</code></td><td><code>boolean</code></td><td>Deprecated, specify adapter type as runtime property <code>druid.indexer.runner.k8s.adapter.type: overlordMultiContainer</code> instead. If your overlord pod has sidecars, this will attempt to start the task with the same sidecars as the overlord pod.</td><td>False</td><td>No</td></tr><tr><td><code>druid.indexer.runner.primaryContainerName</code></td><td><code>String</code></td><td>If running with sidecars, the <code>primaryContainerName</code> should be that of your druid container like <code>druid-overlord</code>.</td><td>First container in <code>podSpec</code> list</td><td>No</td></tr><tr><td><code>druid.indexer.runner.kubexitImage</code></td><td><code>String</code></td><td>Used kubexit project to help shutdown sidecars when the main pod completes. Otherwise jobs with sidecars never terminate.</td><td>karlkfi/kubexit:latest</td><td>No</td></tr><tr><td><code>druid.indexer.runner.disableClientProxy</code></td><td><code>boolean</code></td><td>Use this if you have a global http(s) proxy and you wish to bypass it.</td><td>false</td><td>No</td></tr><tr><td><code>druid.indexer.runner.maxTaskDuration</code></td><td><code>Duration</code></td><td>Max time a task is allowed to run for before getting killed</td><td><code>PT4H</code></td><td>No</td></tr><tr><td><code>druid.indexer.runner.taskCleanupDelay</code></td><td><code>Duration</code></td><td>How long do jobs stay around before getting reaped from K8s</td><td><code>P2D</code></td><td>No</td></tr><tr><td><code>druid.indexer.runner.taskCleanupInterval</code></td><td><code>Duration</code></td><td>How often to check for jobs to be reaped</td><td><code>PT10M</code></td><td>No</td></tr><tr><td><code>druid.indexer.runner.K8sjobLaunchTimeout</code></td><td><code>Duration</code></td><td>How long to wait to launch a K8s task before marking it as failed, on a resource constrained cluster it may take some time.</td><td><code>PT1H</code></td><td>No</td></tr><tr><td><code>druid.indexer.runner.javaOptsArray</code></td><td><code>JsonArray</code></td><td>java opts for the task.</td><td><code>-Xmx1g</code></td><td>No</td></tr><tr><td><code>druid.indexer.runner.labels</code></td><td><code>JsonObject</code></td><td>Additional labels you want to add to peon pod</td><td><code>{}</code></td><td>No</td></tr><tr><td><code>druid.indexer.runner.annotations</code></td><td><code>JsonObject</code></td><td>Additional annotations you want to add to peon pod</td><td><code>{}</code></td><td>No</td></tr><tr><td><code>druid.indexer.runner.peonMonitors</code></td><td><code>JsonArray</code></td><td>Overrides <code>druid.monitoring.monitors</code>. Use this property if you don't want to inherit monitors from the Overlord.</td><td><code>[]</code></td><td>No</td></tr><tr><td><code>druid.indexer.runner.graceTerminationPeriodSeconds</code></td><td><code>Long</code></td><td>Number of seconds you want to wait after a sigterm for container lifecycle hooks to complete. Keep at a smaller value if you want tasks to hold locks for shorter periods.</td><td><code>PT30S</code> (K8s default)</td><td>No</td></tr></tbody></table><h3 class="anchor anchorWithStickyNavbar_LWe7" id="gotchas">Gotchas<a href="#gotchas" class="hash-link" aria-label="Direct link to Gotchas" title="Direct link to Gotchas"></a></h3><ul><li>You must have in your role the ability to launch jobs. </li><li>All Druid Pods belonging to one Druid cluster must be inside same kubernetes namespace.</li><li>For the sidecar support to work, your entry point / command in docker must be explicitly defined your spec. </li></ul><p>You can't have something like this: |
| Dockerfile: |
| <code>ENTRYPOINT: ["foo.sh"]</code></p><p>and in your sidecar specs: </p><div class="language-container: codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-container: codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain"> name: foo</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> args: </span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> - arg1</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> - arg2 </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>That will not work, because we cannot decipher what your command is, the extension needs to know it explicitly. |
| *<em>Even for sidecars like Istio which are dynamically created by the service mesh, this needs to happen.</em> </p><p>Instead do the following: |
| You can keep your Dockerfile the same but you must have a sidecar spec like so: </p><div class="language-container: codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-container: codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain"> name: foo</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> command: foo.sh</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> args: </span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> - arg1</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> - arg2 </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 following roles must also be accessible. An example spec could be: </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">apiVersion: rbac.authorization.k8s.io/v1</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">kind: Role</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">metadata:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> name: druid-cluster</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">rules:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">- apiGroups:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> - ""</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> resources:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> - pods</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> - configmaps</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> - jobs</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> verbs:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> - '*'</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">---</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">kind: RoleBinding</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">apiVersion: rbac.authorization.k8s.io/v1</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">metadata:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> name: druid-cluster</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">subjects:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">- kind: ServiceAccount</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> name: default</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">roleRef:</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> kind: Role</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> name: druid-cluster</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> apiGroup: rbac.authorization.k8s.io</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></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="#how-it-works" class="table-of-contents__link toc-highlight">How it works</a></li><li><a href="#pod-adapters" class="table-of-contents__link toc-highlight">Pod Adapters</a><ul><li><a href="#overlord-single-container-pod-adapter" class="table-of-contents__link toc-highlight">Overlord Single Container Pod Adapter</a></li><li><a href="#overlord-multi-container-pod-adapter" class="table-of-contents__link toc-highlight">Overlord Multi Container Pod Adapter</a></li><li><a href="#custom-template-pod-adapter" class="table-of-contents__link toc-highlight">Custom Template Pod Adapter</a></li></ul></li><li><a href="#configuration" class="table-of-contents__link toc-highlight">Configuration</a><ul><li><a href="#properties" class="table-of-contents__link toc-highlight">Properties</a></li><li><a href="#gotchas" class="table-of-contents__link toc-highlight">Gotchas</a></li></ul></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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