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| </script></nav></div><div class="container mainContainer"><div class="wrapper"><div class="post"><header class="postHeader"><h1 class="postHeaderTitle">Implementing a Custom Scheduler</h1></header><article><div><span><!-- |
| Licensed to the Apache Software Foundation (ASF) under one |
| or more contributor license agreements. See the NOTICE file |
| distributed with this work for additional information |
| regarding copyright ownership. The ASF licenses this file |
| to you under the Apache License, Version 2.0 (the |
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| <p>To run a Heron topology, you’ll need to set up a scheduler that is responsible |
| for topology management. Note: one scheduler is managing only one topology, |
| for the purpose of better isolation. Heron currently supports the following schedulers out of the box:</p> |
| <ul> |
| <li><a href="schedulers-aurora-cluster">Aurora</a></li> |
| <li><a href="schedulers-k8s-by-hand">Kubernetes</a></li> |
| <li><a href="schedulers-k8s-with-helm">Kubernetes-Helm</a></li> |
| <li><a href="schedulers-nomad">Nomad</a></li> |
| <li><a href="schedulers-local">Local scheduler</a></li> |
| <li><a href="schedulers-slurm">Slurm scheduler</a></li> |
| </ul> |
| <p>If you'd like to run Heron on a not-yet-supported system, such as |
| <a href="https://aws.amazon.com/ecs/">Amazon ECS</a>, you can create your own scheduler |
| using Heron's spi, as detailed in the |
| sections below.</p> |
| <p>Java is currently the only supported language for custom schedulers. This may |
| change in the future.</p> |
| <h2><a class="anchor" aria-hidden="true" id="java-setup"></a><a href="#java-setup" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Java Setup</h2> |
| <p>In order to create a custom scheduler, you need to import the <code>heron-spi</code> |
| library into your project.</p> |
| <h4><a class="anchor" aria-hidden="true" id="maven"></a><a href="#maven" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Maven</h4> |
| <pre><code class="hljs css language-xml"><span class="hljs-tag"><<span class="hljs-name">dependency</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">groupId</span>></span>org.apache.heron<span class="hljs-tag"></<span class="hljs-name">groupId</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">artifactId</span>></span>heron-spi<span class="hljs-tag"></<span class="hljs-name">artifactId</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">version</span>></span>0.20.5-incubating<span class="hljs-tag"></<span class="hljs-name">version</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">dependency</span>></span> |
| </code></pre> |
| <h4><a class="anchor" aria-hidden="true" id="gradle"></a><a href="#gradle" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Gradle</h4> |
| <pre><code class="hljs css language-groovy">dependencies { |
| compile <span class="hljs-string">group:</span> <span class="hljs-string">"org.apache.heron"</span>, <span class="hljs-string">name:</span> <span class="hljs-string">"heron-spi"</span>, <span class="hljs-string">version:</span> <span class="hljs-string">"0.20.5-incubating"</span> |
| } |
| </code></pre> |
| <h2><a class="anchor" aria-hidden="true" id="interfaces"></a><a href="#interfaces" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Interfaces</h2> |
| <p>Creating a custom scheduler involves implementing each of the following Java |
| interfaces:</p> |
| <table> |
| <thead> |
| <tr><th style="text-align:left">Interface</th><th style="text-align:left">Role</th><th style="text-align:left">Examples</th></tr> |
| </thead> |
| <tbody> |
| <tr><td style="text-align:left"><a href="/api/org/apache/heron/spi/packing/IPacking.html"><code>IPacking</code></a></td><td style="text-align:left">Defines the algorithm used to generate physical plan for a topology.</td><td style="text-align:left"><a href="/api/org/apache/heron/packing/roundrobin/RoundRobinPacking.html">RoundRobin</a></td></tr> |
| <tr><td style="text-align:left"><a href="/api/org/apache/heron/spi/scheduler/ILauncher.html"><code>ILauncher</code></a></td><td style="text-align:left">Defines how the scheduler is launched</td><td style="text-align:left"><a href="/api/org/apache/heron/scheduler/aurora/AuroraLauncher.html">Aurora</a>, <a href="/api/org/apache/heron/scheduler/local/LocalLauncher.html">local</a></td></tr> |
| <tr><td style="text-align:left"><a href="/api/org/apache/heron/spi/scheduler/IScheduler.html"><code>IScheduler</code></a></td><td style="text-align:left">Defines the scheduler object used to construct topologies</td><td style="text-align:left"><a href="/api/org/apache/heron/scheduler/local/LocalScheduler.html">local</a></td></tr> |
| <tr><td style="text-align:left"><a href="/api/org/apache/heron/spi/uploader/IUploader.html"><code>IUploader</code></a></td><td style="text-align:left">Uploads the topology to a shared location accessible to the runtime environment of the topology</td><td style="text-align:left"><a href="/api/org/apache/heron/uploader/localfs/LocalFileSystemUploader.html">local</a> <a href="/api/org/apache/heron/uploader/hdfs/HdfsUploader.html">HDFS</a> <a href="/api/org/apache/heron/uploader/s3/S3Uploader.html">S3</a></td></tr> |
| </tbody> |
| </table> |
| <p>Heron provides a number of built-in implementations out of box.</p> |
| <h2><a class="anchor" aria-hidden="true" id="running-the-scheduler"></a><a href="#running-the-scheduler" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Running the Scheduler</h2> |
| <p>To run the a custom scheduler, the implementation of the interfaces above must be specified in the <a href="deployment-configuration">config</a>. |
| By default, the heron-cli looks for configurations under <code>${HERON_HOME}/conf/</code>. The location can be overridden using option <code>--config-path</code>. |
| Below is an example showing the command for <a href="user-manuals-heron-cli#submitting-a-topology">topology |
| submission</a>:</p> |
| <pre><code class="hljs css language-bash">$ heron submit [cluster-name-storing-your-new-config]/[role]/[env] \ |
| --config-path [config-folder-path-storing-your-new-config] \ |
| /path/to/topology/my-topology.jar \ |
| biz.acme.topologies.MyTopology |
| </code></pre> |
| <p>The implementation for each of the interfaces listed above must be on Heron's |
| <a href="https://docs.oracle.com/javase/tutorial/essential/environment/paths.html">classpath</a>.</p> |
| </span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/next/compiling-code-organization"><span class="arrow-prev">← </span><span>Code Organization</span></a><a class="docs-next button" href="/docs/next/extending-heron-metric-sink"><span>Custom Metrics Sink</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#java-setup">Java Setup</a></li><li><a href="#interfaces">Interfaces</a></li><li><a href="#running-the-scheduler">Running the Scheduler</a></li></ul></nav></div><footer class="nav-footer" id="footer"><div class="apache-disclaimer">Apache Heron is an effort undergoing incubation at <a target="_blank" href="https://apache.org/">The Apache Software Foundation (ASF)</a> sponsored by the Apache Incubator PMC. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF.<br/><br/>Apache®, the names of Apache projects, and the feather logo are either <a rel="external" href="https://www.apache.org/foundation/marks/list/">registered trademarks or trademarks</a> of the Apache Software Foundation in the United States and/or other countries.<br/><br/><div class="copyright-box">Copyright © 2023 the Apache Software Foundation, Apache Heron, Heron, |
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