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<p>In addition to out-of-the-box scheduler for
<a href="../aurora">Aurora</a>, Heron can also be deployed in a HPC cluster with the Slurm Scheduler.
This allows a researcher to deploy Heron and execute streaming scientific work-flows.</p>
<h2><a class="anchor" aria-hidden="true" id="how-slurm-deployment-works"></a><a href="#how-slurm-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 Slurm Deployment Works</h2>
<p>Using the Slurm scheduler is similar to deploying Heron on other systems. <a href="user-manuals-heron-cli">The Heron CLI</a>  is used to deploy and manage topologies similar to other
schedulers. The main difference is in the configuration.</p>
<p>A set of default configuration files are provided with Heron in the <a href="https://github.com/apache/incubator-heron/tree/master/heron/config/src/yaml/conf/slurm">conf/slurm</a> directory.
The default configuration uses the local file system based state manager. It is
possible that the local file system is mounted using NFS.</p>
<p>When a Heron topology is submitted, the Slurm scheduler allocates the nodes required to
run the job and starts the Heron processes in those nodes. It uses a <code>slurm.sh</code> script found in
<a href="https://github.com/apache/incubator-heron/tree/master/heron/config/src/yaml/conf/slurm">conf/slum</a>
directory to submit the topoloy as a batch job to the slurm scheduler.</p>
<h2><a class="anchor" aria-hidden="true" id="slurm-scheduler-configuration"></a><a href="#slurm-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>Slurm Scheduler Configuration</h2>
<p>To configure Heron to use slurm 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 slurm scheduler.
Set this to <code>org.apache.heron.scheduler.slurm.SlurmScheduler</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.slurm.SlurmLauncher</code></p></li>
<li><p><code>heron.scheduler.local.working.directory</code> --- The shared directory to be used as
Heron sandbox directory.</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> --- This is used to specify 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>
<li><p><code>heron.scheduler.is.service</code> --- Indicate whether the scheduler
is a service. In the case of Slurm, it should be set to <code>False</code>.</p></li>
</ul>
<h3><a class="anchor" aria-hidden="true" id="example-slurm-scheduler-configuration"></a><a href="#example-slurm-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 Slurm 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.slurm.SlurmScheduler</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.slurm.SlurmLauncher</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 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>

<span class="hljs-comment"># Invoke the IScheduler as a library directly</span>
<span class="hljs-attr">heron.scheduler.is.service:</span> <span class="hljs-literal">False</span>
</code></pre>
<h2><a class="anchor" aria-hidden="true" id="slurm-script-slurmsh"></a><a href="#slurm-script-slurmsh" 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>Slurm Script <code>slurm.sh</code></h2>
<p>The script <code>slurm.sh</code> is used by the scheduler to submit the Heron job to the Slurm scheduler.
Edit this file to set specific slurm settings like time, account. The script and <code>scheduler.yaml</code>
must be included with other cluster configuration files.</p>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.20.4-incubating/schedulers-mesos-local-mac"><span class="arrow-prev">← </span><span>Mesos Cluster Locally</span></a><a class="docs-next button" href="/docs/0.20.4-incubating/schedulers-yarn"><span>YARN Cluster</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#how-slurm-deployment-works">How Slurm Deployment Works</a></li><li><a href="#slurm-scheduler-configuration">Slurm Scheduler Configuration</a><ul class="toc-headings"><li><a href="#example-slurm-scheduler-configuration">Example Slurm Scheduler Configuration</a></li></ul></li><li><a href="#slurm-script-slurmsh">Slurm Script <code>slurm.sh</code></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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