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<h1 id="ambari-metrics-emitter">Ambari Metrics Emitter</h1>
<p>To use this Apache Druid (incubating) extension, make sure to <a href="../../operations/including-extensions.html">include</a> <code>ambari-metrics-emitter</code> extension.</p>
<h2 id="introduction">Introduction</h2>
<p>This extension emits Druid metrics to a ambari-metrics carbon server.
Events are sent after been <a href="http://ambari-metrics.readthedocs.org/en/latest/feeding-carbon.html#the-pickle-protocol">pickled</a>; the size of the batch is configurable. </p>
<h2 id="configuration">Configuration</h2>
<p>All the configuration parameters for ambari-metrics emitter are under <code>druid.emitter.ambari-metrics</code>.</p>
<table><thead>
<tr>
<th>property</th>
<th>description</th>
<th>required?</th>
<th>default</th>
</tr>
</thead><tbody>
<tr>
<td><code>druid.emitter.ambari-metrics.hostname</code></td>
<td>The hostname of the ambari-metrics server.</td>
<td>yes</td>
<td>none</td>
</tr>
<tr>
<td><code>druid.emitter.ambari-metrics.port</code></td>
<td>The port of the ambari-metrics server.</td>
<td>yes</td>
<td>none</td>
</tr>
<tr>
<td><code>druid.emitter.ambari-metrics.protocol</code></td>
<td>The protocol used to send metrics to ambari metrics collector. One of http/https</td>
<td>no</td>
<td>http</td>
</tr>
<tr>
<td><code>druid.emitter.ambari-metrics.trustStorePath</code></td>
<td>Path to trustStore to be used for https</td>
<td>no</td>
<td>none</td>
</tr>
<tr>
<td><code>druid.emitter.ambari-metrics.trustStoreType</code></td>
<td>trustStore type to be used for https</td>
<td>no</td>
<td>none</td>
</tr>
<tr>
<td><code>druid.emitter.ambari-metrics.trustStoreType</code></td>
<td>trustStore password to be used for https</td>
<td>no</td>
<td>none</td>
</tr>
<tr>
<td><code>druid.emitter.ambari-metrics.batchSize</code></td>
<td>Number of events to send as one batch.</td>
<td>no</td>
<td>100</td>
</tr>
<tr>
<td><code>druid.emitter.ambari-metrics.eventConverter</code></td>
<td>Filter and converter of druid events to ambari-metrics timeline event(please see next section).</td>
<td>yes</td>
<td>none</td>
</tr>
<tr>
<td><code>druid.emitter.ambari-metrics.flushPeriod</code></td>
<td>Queue flushing period in milliseconds.</td>
<td>no</td>
<td>1 minute</td>
</tr>
<tr>
<td><code>druid.emitter.ambari-metrics.maxQueueSize</code></td>
<td>Maximum size of the queue used to buffer events.</td>
<td>no</td>
<td><code>MAX_INT</code></td>
</tr>
<tr>
<td><code>druid.emitter.ambari-metrics.alertEmitters</code></td>
<td>List of emitters where alerts will be forwarded to.</td>
<td>no</td>
<td>empty list (no forwarding)</td>
</tr>
<tr>
<td><code>druid.emitter.ambari-metrics.emitWaitTime</code></td>
<td>wait time in milliseconds to try to send the event otherwise emitter will throwing event.</td>
<td>no</td>
<td>0</td>
</tr>
<tr>
<td><code>druid.emitter.ambari-metrics.waitForEventTime</code></td>
<td>waiting time in milliseconds if necessary for an event to become available.</td>
<td>no</td>
<td>1000 (1 sec)</td>
</tr>
</tbody></table>
<h3 id="druid-to-ambari-metrics-timeline-event-converter">Druid to Ambari Metrics Timeline Event Converter</h3>
<p>Ambari Metrics Timeline Event Converter defines a mapping between druid metrics name plus dimensions to a timeline event metricName.
ambari-metrics metric path is organized using the following schema:
<code>&lt;namespacePrefix&gt;.[&lt;druid service name&gt;].[&lt;druid hostname&gt;].&lt;druid metrics dimensions&gt;.&lt;druid metrics name&gt;</code>
Properly naming the metrics is critical to avoid conflicts, confusing data and potentially wrong interpretation later on.</p>
<p>Example <code>druid.historical.hist-host1:8080.MyDataSourceName.GroupBy.query/time</code>:</p>
<ul>
<li><code>druid</code> -&gt; namespace prefix </li>
<li><code>historical</code> -&gt; service name </li>
<li><code>hist-host1:8080</code> -&gt; druid hostname</li>
<li><code>MyDataSourceName</code> -&gt; dimension value </li>
<li><code>GroupBy</code> -&gt; dimension value</li>
<li><code>query/time</code> -&gt; metric name</li>
</ul>
<p>We have two different implementation of event converter:</p>
<h4 id="send-all-converter">Send-All converter</h4>
<p>The first implementation called <code>all</code>, will send all the druid service metrics events.
The path will be in the form <code>&lt;namespacePrefix&gt;.[&lt;druid service name&gt;].[&lt;druid hostname&gt;].&lt;dimensions values ordered by dimension&#39;s name&gt;.&lt;metric&gt;</code>
User has control of <code>&lt;namespacePrefix&gt;.[&lt;druid service name&gt;].[&lt;druid hostname&gt;].</code></p>
<div class="highlight"><pre><code class="language-json" data-lang="json"><span></span><span class="err">druid.emitter.ambari-metrics.eventConverter=</span><span class="p">{</span><span class="nt">&quot;type&quot;</span><span class="p">:</span><span class="s2">&quot;all&quot;</span><span class="p">,</span> <span class="nt">&quot;namespacePrefix&quot;</span><span class="p">:</span> <span class="s2">&quot;druid.test&quot;</span><span class="p">,</span> <span class="nt">&quot;appName&quot;</span><span class="p">:</span><span class="s2">&quot;druid&quot;</span><span class="p">}</span>
</code></pre></div>
<h4 id="white-list-based-converter">White-list based converter</h4>
<p>The second implementation called <code>whiteList</code>, will send only the white listed metrics and dimensions.
Same as for the <code>all</code> converter user has control of <code>&lt;namespacePrefix&gt;.[&lt;druid service name&gt;].[&lt;druid hostname&gt;].</code>
White-list based converter comes with the following default white list map located under resources in <code>./src/main/resources/defaultWhiteListMap.json</code></p>
<p>Although user can override the default white list map by supplying a property called <code>mapPath</code>.
This property is a String containing the path for the file containing <strong>white list map Json object</strong>.
For example the following converter will read the map from the file <code>/pathPrefix/fileName.json</code>. </p>
<div class="highlight"><pre><code class="language-json" data-lang="json"><span></span><span class="err">druid.emitter.ambari-metrics.eventConverter=</span><span class="p">{</span><span class="nt">&quot;type&quot;</span><span class="p">:</span><span class="s2">&quot;whiteList&quot;</span><span class="p">,</span> <span class="nt">&quot;namespacePrefix&quot;</span><span class="p">:</span> <span class="s2">&quot;druid.test&quot;</span><span class="p">,</span> <span class="nt">&quot;ignoreHostname&quot;</span><span class="p">:</span><span class="kc">true</span><span class="p">,</span> <span class="nt">&quot;appName&quot;</span><span class="p">:</span><span class="s2">&quot;druid&quot;</span><span class="p">,</span> <span class="nt">&quot;mapPath&quot;</span><span class="p">:</span><span class="s2">&quot;/pathPrefix/fileName.json&quot;</span><span class="p">}</span>
</code></pre></div>
<p><strong>Druid emits a huge number of metrics we highly recommend to use the <code>whiteList</code> converter</strong></p>
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