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| </script></nav></div><div class="container mainContainer"><div class="wrapper"><div class="post"><header class="postHeader"><h1 class="postHeaderTitle">Local Cluster</h1></header><article><div><span><!-- |
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| <p>In addition to out-of-the-box schedulers for |
| <a href="schedulers-aurora-cluster">Aurora</a>, Heron can also be deployed in a local environment, which |
| stands up a mock Heron cluster on a single machine. This can be useful for |
| experimenting with Heron's features, testing a wide variety of possible cluster |
| events, and so on.</p> |
| <p>One of two state managers can be used for coordination when deploying locally:</p> |
| <ul> |
| <li><a href="state-managers-zookeeper">ZooKeeper</a></li> |
| <li><a href="state-managers-local-fs">Local File System</a></li> |
| </ul> |
| <p><strong>Note</strong>: Deploying a Heron cluster locally is not to be confused with Heron's |
| <a href="guides-simulator-mode">simulator mode</a>. Simulator mode enables |
| you to run topologies in a cluster-agnostic JVM process for the purpose of |
| development and debugging, while the local scheduler stands up a Heron cluster |
| on a single machine.</p> |
| <h2><a class="anchor" aria-hidden="true" id="how-local-deployment-works"></a><a href="#how-local-deployment-works" 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>How Local Deployment Works</h2> |
| <p>Using the local scheduler is similar to deploying Heron on other schedulers. |
| The <a href="user-manuals-heron-cli">Heron</a> cli is used to deploy and manage topologies |
| as would be done using a distributed scheduler. The main difference is in |
| the configuration.</p> |
| <h2><a class="anchor" aria-hidden="true" id="local-scheduler-configuration"></a><a href="#local-scheduler-configuration" 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>Local Scheduler Configuration</h2> |
| <p>To configure Heron to use local scheduler, specify the following in <code>scheduler.yaml</code> |
| config file.</p> |
| <ul> |
| <li><p><code>heron.class.scheduler</code> --- Indicates the class to be loaded for local scheduler. |
| Set this to <code>org.apache.heron.scheduler.local.LocalScheduler</code></p></li> |
| <li><p><code>heron.class.launcher</code> --- Specifies the class to be loaded for launching |
| topologies. Set this to <code>org.apache.heron.scheduler.local.LocalLauncher</code></p></li> |
| <li><p><code>heron.scheduler.local.working.directory</code> --- Provides the working |
| directory for topology. The working directory is essentially a scratch pad where |
| topology jars, heron core release binaries, topology logs, etc are generated and kept.</p></li> |
| <li><p><code>heron.package.core.uri</code> --- Indicates the location of the heron core binary package. |
| The local scheduler uses this URI to download the core package to the working directory.</p></li> |
| <li><p><code>heron.directory.sandbox.java.home</code> --- Specifies the java home to |
| be used when running topologies in the containers. Set to <code>${JAVA_HOME}</code> to |
| use the value set in the bash environment variable $JAVA_HOME.</p></li> |
| </ul> |
| <h3><a class="anchor" aria-hidden="true" id="example-local-scheduler-configuration"></a><a href="#example-local-scheduler-configuration" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example Local Scheduler Configuration</h3> |
| <pre><code class="hljs css language-yaml"><span class="hljs-comment"># scheduler class for distributing the topology for execution</span> |
| <span class="hljs-attr">heron.class.scheduler:</span> <span class="hljs-string">org.apache.heron.scheduler.local.LocalScheduler</span> |
| |
| <span class="hljs-comment"># launcher class for submitting and launching the topology</span> |
| <span class="hljs-attr">heron.class.launcher:</span> <span class="hljs-string">org.apache.heron.scheduler.local.LocalLauncher</span> |
| |
| <span class="hljs-comment"># working directory for the topologies</span> |
| <span class="hljs-attr">heron.scheduler.local.working.directory:</span> <span class="hljs-string">${HOME}/.herondata/topologies/${CLUSTER}/${TOPOLOGY}</span> |
| |
| <span class="hljs-comment"># location of the core package</span> |
| <span class="hljs-attr">heron.package.core.uri:</span> <span class="hljs-string">file://${HERON_DIST}/heron-core.tar.gz</span> |
| |
| <span class="hljs-comment"># location of java - pick it up from shell environment</span> |
| <span class="hljs-attr">heron.directory.sandbox.java.home:</span> <span class="hljs-string">${JAVA_HOME}</span> |
| </code></pre> |
| </span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.2-incubating/schedulers-aurora-local"><span class="arrow-prev">← </span><span>Aurora Locally</span></a><a class="docs-next button" href="/docs/0.20.2-incubating/schedulers-standalone"><span>Next</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#how-local-deployment-works">How Local Deployment Works</a></li><li><a href="#local-scheduler-configuration">Local Scheduler Configuration</a><ul class="toc-headings"><li><a href="#example-local-scheduler-configuration">Example Local Scheduler Configuration</a></li></ul></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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