<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Ambari Metrics Emitter · Apache Druid</title><meta name="viewport" content="width=device-width, initial-scale=1.0"/><link rel="canonical" href="https://druid.apache.org/docs/25.0.0/development/extensions-contrib/ambari-metrics-emitter.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="25.0.0" /><meta property="og:title" content="Ambari Metrics Emitter · Apache Druid"/><meta property="og:type" content="website"/><meta property="og:url" content="https://druid.apache.org/index.html"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://druid.apache.org/img/druid_nav.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://druid.apache.org/img/druid_nav.png"/><link rel="shortcut icon" href="/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script async="" src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script><script>
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<p>To use this Apache Druid extension, <a href="/docs/25.0.0/development/extensions.html#loading-extensions">include</a> <code>ambari-metrics-emitter</code> in the extensions load list.</p>
<h2><a class="anchor" aria-hidden="true" id="introduction"></a><a href="#introduction" 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>Introduction</h2>
<p>This extension emits Druid metrics to an ambari-metrics carbon server. Events are sent after been pickled (i.e., batched). The size of the batch is configurable.</p>
<h2><a class="anchor" aria-hidden="true" id="configuration"></a><a href="#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>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><a class="anchor" aria-hidden="true" id="druid-to-ambari-metrics-timeline-event-converter"></a><a href="#druid-to-ambari-metrics-timeline-event-converter" 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>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><a class="anchor" aria-hidden="true" id="send-all-converter"></a><a href="#send-all-converter" 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>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'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>
<pre><code class="hljs css language-json">
druid.emitter.ambari-metrics.eventConverter={"type":"all", "namespacePrefix": "druid.test", "appName":"druid"}

</code></pre>
<h4><a class="anchor" aria-hidden="true" id="white-list-based-converter"></a><a href="#white-list-based-converter" 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>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>
<pre><code class="hljs css language-json">
druid.emitter.ambari-metrics.eventConverter={"type":"whiteList", "namespacePrefix": "druid.test", "ignoreHostname":true, "appName":"druid", "mapPath":"/pathPrefix/fileName.json"}

</code></pre>
<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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