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aria-label="Scroll back to top" class="clean-btn theme-back-to-top-button backToTopButton_sjWU" type="button"></button><div class="docRoot_UBD9"><main class="docMainContainer_TBSr docMainContainerEnhanced_lQrH"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>InfluxDB Emitter</h1></header><p>To use this Apache Druid extension, <a href="/docs/34.0.0/configuration/extensions#loading-extensions">include</a> <code>druid-influxdb-emitter</code> in the extensions load list.</p> |
| <h2 class="anchor anchorWithStickyNavbar_LWe7" id="introduction">Introduction<a href="#introduction" class="hash-link" aria-label="Direct link to Introduction" title="Direct link to Introduction"></a></h2> |
| <p>This extension emits druid metrics to <a href="https://www.influxdata.com/time-series-platform/influxdb/" target="_blank" rel="noopener noreferrer">InfluxDB</a> over HTTP. Currently this emitter only emits service metric events to InfluxDB (See <a href="/docs/34.0.0/operations/metrics">Druid metrics</a> for a list of metrics). |
| When a metric event is fired it is added to a queue of events. After a configurable amount of time, the events on the queue are transformed to InfluxDB's line protocol |
| and POSTed to the InfluxDB HTTP API. The entire queue is flushed at this point. The queue is also flushed as the emitter is shutdown.</p> |
| <p>Note that authentication and authorization must be <a href="https://docs.influxdata.com/influxdb/v1.7/administration/authentication_and_authorization/" target="_blank" rel="noopener noreferrer">enabled</a> on the InfluxDB server.</p> |
| <h2 class="anchor anchorWithStickyNavbar_LWe7" id="configuration">Configuration<a href="#configuration" class="hash-link" aria-label="Direct link to Configuration" title="Direct link to Configuration"></a></h2> |
| <p>All the configuration parameters for the influxdb emitter are under <code>druid.emitter.influxdb</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.influxdb.hostname</code></td><td>The hostname of the InfluxDB server.</td><td>Yes</td><td>N/A</td></tr><tr><td><code>druid.emitter.influxdb.port</code></td><td>The port of the InfluxDB server.</td><td>No</td><td>8086</td></tr><tr><td><code>druid.emitter.influxdb.protocol</code></td><td>The protocol used to send metrics to InfluxDB. One of http/https</td><td>No</td><td>http</td></tr><tr><td><code>druid.emitter.influxdb.trustStorePath</code></td><td>The path to the trustStore to be used for https</td><td>No</td><td>none</td></tr><tr><td><code>druid.emitter.influxdb.trustStoreType</code></td><td>The trustStore type to be used for https</td><td>No</td><td><code>jks</code></td></tr><tr><td><code>druid.emitter.influxdb.trustStorePassword</code></td><td>The trustStore password to be used for https</td><td>No</td><td>none</td></tr><tr><td><code>druid.emitter.influxdb.databaseName</code></td><td>The name of the database in InfluxDB.</td><td>Yes</td><td>N/A</td></tr><tr><td><code>druid.emitter.influxdb.maxQueueSize</code></td><td>The size of the queue that holds events.</td><td>No</td><td>Integer.MAX_VALUE(=2^31-1)</td></tr><tr><td><code>druid.emitter.influxdb.flushPeriod</code></td><td>How often (in milliseconds) the events queue is parsed into Line Protocol and POSTed to InfluxDB.</td><td>No</td><td>60000</td></tr><tr><td><code>druid.emitter.influxdb.flushDelay</code></td><td>How long (in milliseconds) the scheduled method will wait until it first runs.</td><td>No</td><td>60000</td></tr><tr><td><code>druid.emitter.influxdb.influxdbUserName</code></td><td>The username for authenticating with the InfluxDB database.</td><td>Yes</td><td>N/A</td></tr><tr><td><code>druid.emitter.influxdb.influxdbPassword</code></td><td>The password of the database authorized user</td><td>Yes</td><td>N/A</td></tr><tr><td><code>druid.emitter.influxdb.dimensionWhitelist</code></td><td>A whitelist of metric dimensions to include as tags</td><td>No</td><td><code>["dataSource","type","numMetrics","numDimensions","threshold","dimension","taskType","taskStatus","tier"]</code></td></tr></tbody></table> |
| <h2 class="anchor anchorWithStickyNavbar_LWe7" id="influxdb-line-protocol">InfluxDB Line Protocol<a href="#influxdb-line-protocol" class="hash-link" aria-label="Direct link to InfluxDB Line Protocol" title="Direct link to InfluxDB Line Protocol"></a></h2> |
| <p>An example of how this emitter parses a Druid metric event into InfluxDB's <a href="https://docs.influxdata.com/influxdb/v1.7/write_protocols/line_protocol_reference/" target="_blank" rel="noopener noreferrer">line protocol</a> is given here:</p> |
| <p>The syntax of the line protocol is :</p> |
| <p><code><measurement>[,<tag_key>=<tag_value>[,<tag_key>=<tag_value>]] <field_key>=<field_value>[,<field_key>=<field_value>] [<timestamp>]</code></p> |
| <p>where timestamp is in nanoseconds since epoch.</p> |
| <p>A typical service metric event as recorded by Druid's logging emitter is: <code>Event [{"feed":"metrics","timestamp":"2017-10-31T09:09:06.857Z","service":"druid/historical","host":"historical001:8083","version":"0.11.0-SNAPSHOT","metric":"query/cache/total/hits","value":34787256}]</code>.</p> |
| <p>This event is parsed into line protocol according to these rules:</p> |
| <ul> |
| <li>The measurement becomes druid_query since query is the first part of the metric.</li> |
| <li>The tags are service=druid/historical, hostname=historical001, metric=druid_cache_total. (The metric tag is the middle part of the druid metric separated with _ and preceded by druid_. Another example would be if an event has metric=query/time then there is no middle part and hence no metric tag)</li> |
| <li>The field is druid_hits since this is the last part of the metric.</li> |
| </ul> |
| <p>This gives the following String which can be POSTed to InfluxDB: <code>"druid_query,service=druid/historical,hostname=historical001,metric=druid_cache_total druid_hits=34787256 1509440946857000000"</code></p> |
| <p>The InfluxDB emitter has a white list of dimensions |
| which will be added as a tag to the line protocol string if the metric has a dimension from the white list. |
| The value of the dimension is sanitized such that every occurrence of a dot or whitespace is replaced with a <code>_</code> .</p></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#introduction" class="table-of-contents__link toc-highlight">Introduction</a></li><li><a href="#configuration" class="table-of-contents__link toc-highlight">Configuration</a></li><li><a href="#influxdb-line-protocol" class="table-of-contents__link toc-highlight">InfluxDB Line Protocol</a></li></ul></div></div></div></div></main></div></div></div><footer class="footer"><div class="container container-fluid"><div class="footer__bottom text--center"><div class="margin-bottom--sm"><img src="/img/favicon.png" class="footer__logo themedComponent_mlkZ themedComponent--light_NVdE"><img src="/img/favicon.png" class="footer__logo themedComponent_mlkZ themedComponent--dark_xIcU"></div><div class="footer__copyright">Copyright © 2025 Apache Software Foundation. Except where otherwise noted, licensed under CC BY-SA 4.0. Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></div></footer></div> |
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