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<p><strong>Heron Tracker</strong> is a web service that continuously gathers a wide
variety of information about Heron topologies and exposes
that information through a <a href="user-manuals-tracker-rest">JSON REST API</a>.
More on the role of the Tracker can be found
<a href="heron-architecture#heron-tracker">here</a>.</p>
<h2><a class="anchor" aria-hidden="true" id="building-heron-tracker"></a><a href="#building-heron-tracker" 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>Building Heron Tracker</h2>
<p>Heron uses <a href="http://bazel.io/">bazel</a> for compiling.
<a href="compiling-overview">Compiling</a> describes how to setup bazel
for heron.</p>
<pre><code class="hljs css language-bash"><span class="hljs-comment"># Build heron-tracker</span>
$ bazel build heron/tools/tracker/src/python:heron-tracker

<span class="hljs-comment"># The location of heron-tracker pex executable is</span>
<span class="hljs-comment"># bazel-bin/heron/tools/tracker/src/python/heron-tracker</span>
<span class="hljs-comment"># To run using default options:</span>
$ ./bazel-bin/heron/tools/tracker/src/python/heron-tracker
</code></pre>
<p><code>heron-tracker</code> is a self executable
<a href="https://pex.readthedocs.io/en/latest/whatispex.html">pex</a> archive.</p>
<h3><a class="anchor" aria-hidden="true" id="heron-tracker-config-file"></a><a href="#heron-tracker-config-file" 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>Heron Tracker Config File</h3>
<p>The config file is a <code>yaml</code> file that should contain the following information.</p>
<h4><a class="anchor" aria-hidden="true" id="1-state-manager-locations"></a><a href="#1-state-manager-locations" 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>1. State Manager locations</h4>
<p>This is a list of locations where topology writes its states. An example of
<a href="state-managers-zookeeper">zookeeper state manager</a> and
<a href="state-managers-local-fs">local file state manager</a> look like this:</p>
<pre><code class="hljs css language-yaml"><span class="hljs-comment">## Contains the sources where the states are stored.</span>
<span class="hljs-comment"># Each source has these attributes:</span>
<span class="hljs-comment"># 1. type - type of state manager (zookeeper or file, etc.)</span>
<span class="hljs-comment"># 2. name - name to be used for this source</span>
<span class="hljs-comment"># 3. hostport - only used to connect to zk, must be of the form 'host:port'</span>
<span class="hljs-comment"># 4. rootpath - where all the states are stored</span>
<span class="hljs-comment"># 5. tunnelhost - if ssh tunneling needs to be established to connect to it</span>
<span class="hljs-attr">statemgrs:</span>
  <span class="hljs-bullet">-</span>
    <span class="hljs-attr">type:</span> <span class="hljs-string">"file"</span>
    <span class="hljs-attr">name:</span> <span class="hljs-string">"local"</span>
    <span class="hljs-attr">rootpath:</span> <span class="hljs-string">"~/.herondata/repository/state/local"</span>
    <span class="hljs-attr">tunnelhost:</span> <span class="hljs-string">"localhost"</span>
<span class="hljs-comment">#</span>
<span class="hljs-comment"># To use 'localzk', launch a zookeeper server locally</span>
<span class="hljs-comment"># and create the following path:</span>
<span class="hljs-comment">#  *. /heron/topologies</span>
<span class="hljs-comment">#</span>
<span class="hljs-comment">#  -</span>
<span class="hljs-comment">#    type: "zookeeper"</span>
<span class="hljs-comment">#    name: "localzk"</span>
<span class="hljs-comment">#    hostport: "localhost:2181"</span>
<span class="hljs-comment">#    rootpath: "/heron"</span>
<span class="hljs-comment">#    tunnelhost: "localhost" -</span>
</code></pre>
<p>Topologies from all the state managers would be read and can be queried from
Tracker.</p>
<p>Note that Tracker does not create any zookeeper nodes itself. It is a readonly
service. If you launch the Tracker without creating <code>/topologies</code> node under the
rootpath, Tracker will fail with a <code>NoNodeError</code>.</p>
<h4><a class="anchor" aria-hidden="true" id="2-viz-url-format"></a><a href="#2-viz-url-format" 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>2. Viz URL Format</h4>
<p>This is an optional config. If it is present, then it will show up for each
topology as the viz link as shown below. For each topology, these parameters
will be filled appropriately. This parameter can be used to link metrics
dashboards with topology UI page.</p>
<p><img src="/docs/assets/viz-link.png" alt="Viz Link"></p>
<pre><code class="hljs css language-yaml"><span class="hljs-comment"># The URL that points to a topology's metrics dashboard.</span>
<span class="hljs-comment"># This value can use following parameters to create a valid</span>
<span class="hljs-comment"># URL based on the topology. All parameters are self-explanatory.</span>
<span class="hljs-comment"># These are found in the execution state of the topology.</span>
<span class="hljs-comment">#</span>
<span class="hljs-comment">#   ${CLUSTER}</span>
<span class="hljs-comment">#   ${ENVIRON}</span>
<span class="hljs-comment">#   ${TOPOLOGY}</span>
<span class="hljs-comment">#   ${ROLE}</span>
<span class="hljs-comment">#   ${USER}</span>
<span class="hljs-comment">#</span>
<span class="hljs-comment"># This is a sample, and should be changed to point to corresponding dashboard.</span>
<span class="hljs-comment">#</span>
<span class="hljs-comment"># viz.url.format: "http://localhost/${CLUSTER}/${ENVIRON}/${TOPOLOGY}/${ROLE}/${USER}"</span>
</code></pre>
<h3><a class="anchor" aria-hidden="true" id="heron-tracker-args"></a><a href="#heron-tracker-args" 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>Heron Tracker Args</h3>
<ul>
<li><code>--port</code> - Port to run the heron-tracker on. Default port is <code>8888</code>.</li>
<li><code>--config-file</code> - The location of the config file for tracker. Default config
file is <code>~/.herontools/conf/heron_tracker.yaml</code>.</li>
</ul>
<pre><code class="hljs css language-bash">$ heron-tracker
<span class="hljs-comment"># is equivalent to</span>
$ heron-ui --port=8888 --config-file=~/.herontools/conf/heron_tracker.yaml
</code></pre>
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