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<p>To setup a Heron cluster, you need to configure a few files. Each file configures
a component of the Heron streaming framework.</p>
<ul>
<li><p><strong>scheduler.yaml</strong> --- This file specifies the required classes for launcher,
scheduler, and for managing the topology at runtime. Any other specific parameters
for the scheduler go into this file.</p></li>
<li><p><strong>statemgr.yaml</strong> --- This file contains the classes and the configuration for state manager.
The state manager maintains the running state of the topology as logical plan, physical plan,
scheduler state, and execution state.</p></li>
<li><p><strong>uploader.yaml</strong> --- This file specifies the classes and configuration for the uploader,
which uploads the topology jars to storage. Once the containers are scheduled, they will
download these jars from the storage for running.</p></li>
<li><p><strong>heron_internals.yaml</strong> --- This file contains parameters that control
how heron behaves. Tuning these parameters requires advanced knowledge of heron architecture and its
components. For starters, the best option is just to copy the file provided with sample
configuration. Once you are familiar with the system you can tune these parameters to achieve
high throughput or low latency topologies.</p></li>
<li><p><strong>metrics_sinks.yaml</strong> --- This file specifies where the run-time system and topology metrics
will be routed. By default, the <code>file sink</code> and <code>tmanager sink</code> need to be present. In addition,
<code>scribe sink</code> and <code>graphite sink</code> are also supported.</p></li>
<li><p><strong>packing.yaml</strong> --- This file specifies the classes for <code>packing algorithm</code>, which defaults
to Round Robin, if not specified.</p></li>
<li><p><strong>client.yaml</strong> --- This file controls the behavior of the <code>heron</code> client. This is optional.</p></li>
</ul>
<h1><a class="anchor" aria-hidden="true" id="assembling-the-configuration"></a><a href="#assembling-the-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>Assembling the Configuration</h1>
<p>All configuration files are assembled together to form the cluster configuration. For example,
a cluster named <code>devcluster</code> that uses the Aurora for scheduler, ZooKeeper for state manager and
HDFS for uploader will have the following set of configurations.</p>
<h2><a class="anchor" aria-hidden="true" id="scheduleryaml-for-aurora"></a><a href="#scheduleryaml-for-aurora" 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>scheduler.yaml (for Aurora)</h2>
<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 java</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="statemgryaml-for-zookeeper"></a><a href="#statemgryaml-for-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>statemgr.yaml (for ZooKeeper)</h2>
<pre><code class="hljs css language-yaml"><span class="hljs-comment"># zookeeper state manager class for managing state in a persistent fashion</span>
<span class="hljs-attr">heron.class.state.manager:</span> <span class="hljs-string">org.apache.heron.statemgr.zookeeper.curator.CuratorStateManager</span>

<span class="hljs-comment"># zookeeper state manager connection string</span>
<span class="hljs-attr">heron.statemgr.connection.string:</span>  <span class="hljs-string">"127.0.0.1:2181"</span>

<span class="hljs-comment"># path of the root address to store the state in zookeeper  </span>
<span class="hljs-attr">heron.statemgr.root.path:</span> <span class="hljs-string">"/heron"</span>

<span class="hljs-comment"># create the zookeeper nodes, if they do not exist</span>
<span class="hljs-attr">heron.statemgr.zookeeper.is.initialize.tree:</span> <span class="hljs-literal">True</span>
</code></pre>
<h2><a class="anchor" aria-hidden="true" id="uploaderyaml-for-hdfs"></a><a href="#uploaderyaml-for-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>uploader.yaml (for HDFS)</h2>
<pre><code class="hljs css language-yaml"><span class="hljs-comment"># Directory of config files for hadoop client to read from</span>
<span class="hljs-attr">heron.uploader.hdfs.config.directory:</span>              <span class="hljs-string">"/home/hadoop/hadoop/conf/"</span>

<span class="hljs-comment"># The URI of the directory for uploading topologies in the HDFS</span>
<span class="hljs-attr">heron.uploader.hdfs.topologies.directory.uri:</span>      <span class="hljs-string">"hdfs:///heron/topology/"</span>
</code></pre>
<h2><a class="anchor" aria-hidden="true" id="packingyaml-for-round-robin"></a><a href="#packingyaml-for-round-robin" 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>packing.yaml (for Round Robin)</h2>
<pre><code class="hljs css language-yaml"><span class="hljs-comment"># packing algorithm for packing instances into containers</span>
<span class="hljs-attr">heron.class.packing.algorithm:</span>    <span class="hljs-string">org.apache.heron.packing.roundrobin.RoundRobinPacking</span>
</code></pre>
<h2><a class="anchor" aria-hidden="true" id="clientyaml-for-heron-cli"></a><a href="#clientyaml-for-heron-cli" 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>client.yaml (for heron cli)</h2>
<pre><code class="hljs css language-yaml"><span class="hljs-comment"># should the role parameter be required</span>
<span class="hljs-attr">heron.config.role.required:</span> <span class="hljs-literal">false</span>

<span class="hljs-comment"># should the environ parameter be required</span>
<span class="hljs-attr">heron.config.env.required:</span> <span class="hljs-literal">false</span>
</code></pre>
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