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<p>Heron supports deployment on <a href="http://aurora.apache.org/">Apache Aurora</a> out of
the box. A step by step guide on how to setup Heron with Apache Aurora locally
can be found in <a href="schedulers-aurora-local">Setting up Heron with Aurora Cluster Locally on Linux</a>. You can also run Heron on
a <a href="schedulers-local">local scheduler</a>.</p>
<h2><a class="anchor" aria-hidden="true" id="how-heron-on-aurora-works"></a><a href="#how-heron-on-aurora-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 Heron on Aurora Works</h2>
<p>Aurora doesn't have a Heron scheduler <em>per se</em>. Instead, when a topology is
submitted to Heron, <code>heron</code> cli interacts with Aurora to automatically deploy
all the <a href="heron-architecture">components</a> necessary to <a href="user-manuals-heron-cli">manage
topologies</a>.</p>
<h2><a class="anchor" aria-hidden="true" id="zookeeper"></a><a href="#zookeeper" 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>ZooKeeper</h2>
<p>To run Heron on Aurora, you'll need to set up a ZooKeeper cluster and configure
Heron to communicate with it. Instructions can be found in <a href="state-managers-zookeeper">Setting up
ZooKeeper</a>.</p>
<h2><a class="anchor" aria-hidden="true" id="hosting-binaries"></a><a href="#hosting-binaries" 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>Hosting Binaries</h2>
<p>To deploy Heron, the Aurora cluster needs access to the
Heron core binary, which can be hosted wherever you'd like, so long as
it's accessible to Aurora (for example in <a href="https://aws.amazon.com/s3/">Amazon
S3</a> or using a local blob storage solution). You
can download the core binary from github or build it using the instructions
in <a href="compiling-overview#building-all-components">Creating a New Heron Release</a>.</p>
<p>Command for fetching the binary is in the <code>heron.aurora</code> config file. By default it is
using a <code>curl</code> command to fetch the binary. For example, if the binary is hosted in
HDFS, you need to change the fetch user package command in <code>heron.aurora</code> to use the
<code>hdfs</code> command instead of <code>curl</code>.</p>
<h3><a class="anchor" aria-hidden="true" id="heronaurora-example-binary-fetch-using-hdfs"></a><a href="#heronaurora-example-binary-fetch-using-hdfs" 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><code>heron.aurora</code> example binary fetch using HDFS</h3>
<pre><code class="hljs css language-bash">fetch_heron_system = Process(
  name = <span class="hljs-string">'fetch_heron_system'</span>,
  cmdline = <span class="hljs-string">'hdfs dfs -get %s %s &amp;&amp; tar zxf %s'</span> % (heron_core_release_uri, 
        core_release_file, core_release_file)
)
</code></pre>
<p>Once your Heron binaries are hosted somewhere that is accessible to Aurora, you
should run tests to ensure that Aurora can successfully fetch them.</p>
<h2><a class="anchor" aria-hidden="true" id="uploading-the-topologies"></a><a href="#uploading-the-topologies" 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>Uploading the Topologies</h2>
<p>Heron uses an uploader to upload the topology to a shared location so that a worker can fetch
the topology to its sandbox. The configuration for an uploader is in the <code>uploader.yaml</code>
config file. For distributed Aurora deployments, Heron can use <code>HdfsUploader</code> or <code>S3Uploader</code>.
Details on configuring the uploaders can be found in the documentation for the
<a href="uploaders-hdfs">HDFS</a> and <a href="uploaders-amazon-s3">S3</a> uploaders.</p>
<p>After configuring an uploader, the <code>heron.aurora</code> config file needs to be modified accordingly to
fetch the topology.</p>
<h3><a class="anchor" aria-hidden="true" id="heronaurora-example-topology-fetch-using-hdfs"></a><a href="#heronaurora-example-topology-fetch-using-hdfs" 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><code>heron.aurora</code> example topology fetch using HDFS</h3>
<pre><code class="hljs css language-bash">fetch_user_package = Process(
  name = <span class="hljs-string">'fetch_user_package'</span>,
  cmdline = <span class="hljs-string">'hdfs dfs -get %s %s &amp;&amp; tar zxf %s'</span> % (heron_topology_jar_uri, 
          topology_package_file, topology_package_file)
)
</code></pre>
<h2><a class="anchor" aria-hidden="true" id="aurora-scheduler-configuration"></a><a href="#aurora-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>Aurora Scheduler Configuration</h2>
<p>To configure Heron to use Aurora scheduler, modify the <code>scheduler.yaml</code>
config file specific for the Heron cluster. The following must be specified
for each cluster:</p>
<ul>
<li><p><code>heron.class.scheduler</code> --- Indicates the class to be loaded for Aurora scheduler.
You should set this to <code>org.apache.heron.scheduler.aurora.AuroraScheduler</code></p></li>
<li><p><code>heron.class.launcher</code> --- Specifies the class to be loaded for launching and
submitting topologies. To configure the Aurora launcher, set this to
<code>org.apache.heron.scheduler.aurora.AuroraLauncher</code></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.</p></li>
<li><p><code>heron.scheduler.is.service</code> --- This config indicates whether the scheduler
is a service. In the case of Aurora, it should be set to <code>False</code>.</p></li>
</ul>
<h3><a class="anchor" aria-hidden="true" id="example-aurora-scheduler-configuration"></a><a href="#example-aurora-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 Aurora 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.aurora.AuroraScheduler</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.aurora.AuroraLauncher</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:///vagrant/.herondata/dist/heron-core-release.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">/usr/lib/jvm/java-1.8.0-openjdk-amd64/</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="working-with-topologies"></a><a href="#working-with-topologies" 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>Working with Topologies</h2>
<p>After setting up ZooKeeper and generating an Aurora-accessible Heron core binary
release, any machine that has the <code>heron</code> cli tool can be used to manage Heron
topologies (i.e. can submit topologies, activate and deactivate them, etc.).</p>
<p>The most important thing at this stage is to ensure that <code>heron</code> cli is available
across all machines. Once the cli is available, Aurora as a scheduler
can be enabled by specifying the proper configuration when managing topologies.</p>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/next/schedulers-k8s-execution-environment"><span class="arrow-prev">← </span><span>Kubernetes Environment Customization</span></a><a class="docs-next button" href="/docs/next/schedulers-aurora-local"><span>Aurora Locally</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#how-heron-on-aurora-works">How Heron on Aurora Works</a></li><li><a href="#zookeeper">ZooKeeper</a></li><li><a href="#hosting-binaries">Hosting Binaries</a><ul class="toc-headings"><li><a href="#heronaurora-example-binary-fetch-using-hdfs"><code>heron.aurora</code> example binary fetch using HDFS</a></li></ul></li><li><a href="#uploading-the-topologies">Uploading the Topologies</a><ul class="toc-headings"><li><a href="#heronaurora-example-topology-fetch-using-hdfs"><code>heron.aurora</code> example topology fetch using HDFS</a></li></ul></li><li><a href="#aurora-scheduler-configuration">Aurora Scheduler Configuration</a><ul class="toc-headings"><li><a href="#example-aurora-scheduler-configuration">Example Aurora Scheduler Configuration</a></li></ul></li><li><a href="#working-with-topologies">Working with Topologies</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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