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| <p>All Apache Druid services that can serve queries can also log the query requests they process. |
| Request logs contain information on query metrics, including execution time and memory usage. |
| You can use information in the request logs to monitor query performance, determine bottlenecks, and analyze and improve slow queries.</p> |
| <p>Request logging is disabled by default. |
| This topic describes how to configure Druid to generate request logs to track query metrics.</p> |
| <h2><a class="anchor" aria-hidden="true" id="configure-request-logging"></a><a href="#configure-request-logging" 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>Configure request logging</h2> |
| <p>To enable request logging, determine the type of request logger to use, then set the configurations specific to the request logger type.</p> |
| <p>The following request logger types are available:</p> |
| <ul> |
| <li><code>noop</code>: Disables request logging, the default behavior.</li> |
| <li><a href="/docs/0.23.0/configuration/index.html#file-request-logging"><code>file</code></a>: Stores logs to disk.</li> |
| <li><a href="/docs/0.23.0/configuration/index.html#emitter-request-logging"><code>emitter</code></a>: Logs request to an external location, which is configured through an emitter.</li> |
| <li><a href="/docs/0.23.0/configuration/index.html#slf4j-request-logging"><code>slf4j</code></a>: Logs queries via the SLF4J Java logging API.</li> |
| <li><a href="/docs/0.23.0/configuration/index.html#filtered-request-logging"><code>filtered</code></a>: Filters requests by query type or execution time before logging the filtered queries by the delegated request logger.</li> |
| <li><a href="/docs/0.23.0/configuration/index.html#composing-request-logging"><code>composing</code></a>: Logs all requests to multiple request loggers.</li> |
| <li><a href="/docs/0.23.0/configuration/index.html#switching-request-logging"><code>switching</code></a>: Logs native queries and SQL queries to separate request loggers.</li> |
| </ul> |
| <p>Define the type of request logger in <code>druid.request.logging.type</code>. |
| See the <a href="/docs/0.23.0/configuration/index.html#request-logging">Request logging configuration</a> for properties to set for each type of request logger. |
| Specify these properties in the <code>common.runtime.properties</code> file. |
| You must restart Druid for the changes to take effect.</p> |
| <p>Druid stores the results in the Broker logs, unless the request logging type is <code>emitter</code>. |
| If you use emitter request logging, you must also configure metrics emission.</p> |
| <h2><a class="anchor" aria-hidden="true" id="configure-metrics-emission"></a><a href="#configure-metrics-emission" 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>Configure metrics emission</h2> |
| <p>Druid includes various emitters to send metrics and alerts. |
| To emit query metrics, set <code>druid.request.logging.feed=emitter</code>, and define the emitter type in the <code>druid.emitter</code> property.</p> |
| <p>You can use any of the following emitters in Druid:</p> |
| <ul> |
| <li><code>noop</code>: Disables metric emission, the default behavior.</li> |
| <li><a href="/docs/0.23.0/configuration/index.html#logging-emitter-module"><code>logging</code></a>: Emits metrics to Log4j 2. See <a href="/docs/0.23.0/configuration/logging.html">Logging</a> to configure Log4j 2 for use with Druid.</li> |
| <li><a href="/docs/0.23.0/configuration/index.html#http-emitter-module"><code>http</code></a>: Sends HTTP <code>POST</code> requests containing the metrics in JSON format to a user-defined endpoint.</li> |
| <li><a href="/docs/0.23.0/configuration/index.html#parametrized-http-emitter-module"><code>parametrized</code></a>: Operates like the <code>http</code> emitter but fine-tunes the recipient URL based on the event feed.</li> |
| <li><a href="/docs/0.23.0/configuration/index.html#composing-emitter-module"><code>composing</code></a>: Emits metrics to multiple emitter types.</li> |
| <li><a href="/docs/0.23.0/configuration/index.html#graphite-emitter"><code>graphite</code></a>: Emits metrics to a <a href="https://graphiteapp.org/">Graphite</a> Carbon service.</li> |
| </ul> |
| <p>Specify these properties in the <code>common.runtime.properties</code> file. |
| See the <a href="/docs/0.23.0/configuration/index.html#metrics-emitters">Metrics emitters configuration</a> for properties to set for each type of metrics emitter. |
| You must restart Druid for the changes to take effect.</p> |
| <h2><a class="anchor" aria-hidden="true" id="example"></a><a href="#example" 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>Example</h2> |
| <p>The following configuration shows how to enable request logging and post query metrics to the endpoint <code>http://example.com:8080/path</code>.</p> |
| <pre><code class="hljs"><span class="hljs-comment"># Enable request logging and configure the emitter request logger</span> |
| <span class="hljs-attr">druid.request.logging.type</span>=emitter |
| <span class="hljs-attr">druid.request.logging.feed</span>=myRequestLogFeed |
| |
| <span class="hljs-comment"># Enable metrics emission and tell Druid where to emit messages</span> |
| <span class="hljs-attr">druid.emitter</span>=http |
| <span class="hljs-attr">druid.emitter.http.recipientBaseUrl</span>=http://example.com:<span class="hljs-number">8080</span>/path |
| |
| <span class="hljs-comment"># Authenticate to the base URL, if needed</span> |
| <span class="hljs-attr">druid.emitter.http.basicAuthentication</span>=username:password |
| </code></pre> |
| <p>The following shows an example log emitter output:</p> |
| <pre><code class="hljs">[ |
| { |
| <span class="hljs-attr">"feed"</span>: <span class="hljs-string">"metrics"</span>, |
| <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2022-01-06T20:32:06.628Z"</span>, |
| <span class="hljs-attr">"service"</span>: <span class="hljs-string">"druid/broker"</span>, |
| <span class="hljs-attr">"host"</span>: <span class="hljs-string">"localhost:8082"</span>, |
| <span class="hljs-attr">"version"</span>: <span class="hljs-string">"2022.01.0-iap-SNAPSHOT"</span>, |
| <span class="hljs-attr">"metric"</span>: <span class="hljs-string">"sqlQuery/bytes"</span>, |
| <span class="hljs-attr">"value"</span>: <span class="hljs-number">9351</span>, |
| <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"[wikipedia]"</span>, |
| <span class="hljs-attr">"id"</span>: <span class="hljs-string">"56e8317b-31cc-443d-b109-47f51b21d4c3"</span>, |
| <span class="hljs-attr">"nativeQueryIds"</span>: <span class="hljs-string">"[2b9cbced-11fc-4d78-a58c-c42863dff3c8]"</span>, |
| <span class="hljs-attr">"remoteAddress"</span>: <span class="hljs-string">"127.0.0.1"</span>, |
| <span class="hljs-attr">"success"</span>: <span class="hljs-string">"true"</span> |
| }, |
| { |
| <span class="hljs-attr">"feed"</span>: <span class="hljs-string">"myRequestLogFeed"</span>, |
| <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2022-01-06T20:32:06.585Z"</span>, |
| <span class="hljs-attr">"remoteAddr"</span>: <span class="hljs-string">"127.0.0.1"</span>, |
| <span class="hljs-attr">"service"</span>: <span class="hljs-string">"druid/broker"</span>, |
| <span class="hljs-attr">"sqlQueryContext"</span>: |
| { |
| <span class="hljs-attr">"useApproximateCountDistinct"</span>: <span class="hljs-literal">false</span>, |
| <span class="hljs-attr">"sqlQueryId"</span>: <span class="hljs-string">"56e8317b-31cc-443d-b109-47f51b21d4c3"</span>, |
| <span class="hljs-attr">"useApproximateTopN"</span>: <span class="hljs-literal">false</span>, |
| <span class="hljs-attr">"useCache"</span>: <span class="hljs-literal">false</span>, |
| <span class="hljs-attr">"sqlOuterLimit"</span>: <span class="hljs-number">101</span>, |
| <span class="hljs-attr">"populateCache"</span>: <span class="hljs-literal">false</span>, |
| <span class="hljs-attr">"nativeQueryIds"</span>: <span class="hljs-string">"[2b9cbced-11fc-4d78-a58c-c42863dff3c8]"</span> |
| }, |
| <span class="hljs-attr">"queryStats"</span>: |
| { |
| <span class="hljs-attr">"sqlQuery/time"</span>: <span class="hljs-number">43</span>, |
| <span class="hljs-attr">"sqlQuery/bytes"</span>: <span class="hljs-number">9351</span>, |
| <span class="hljs-attr">"success"</span>: <span class="hljs-literal">true</span>, |
| <span class="hljs-attr">"context"</span>: |
| { |
| <span class="hljs-attr">"useApproximateCountDistinct"</span>: <span class="hljs-literal">false</span>, |
| <span class="hljs-attr">"sqlQueryId"</span>: <span class="hljs-string">"56e8317b-31cc-443d-b109-47f51b21d4c3"</span>, |
| <span class="hljs-attr">"useApproximateTopN"</span>: <span class="hljs-literal">false</span>, |
| <span class="hljs-attr">"useCache"</span>: <span class="hljs-literal">false</span>, |
| <span class="hljs-attr">"sqlOuterLimit"</span>: <span class="hljs-number">101</span>, |
| <span class="hljs-attr">"populateCache"</span>: <span class="hljs-literal">false</span>, |
| <span class="hljs-attr">"nativeQueryIds"</span>: <span class="hljs-string">"[2b9cbced-11fc-4d78-a58c-c42863dff3c8]"</span> |
| }, |
| <span class="hljs-attr">"identity"</span>: <span class="hljs-string">"allowAll"</span> |
| }, |
| <span class="hljs-attr">"query"</span>: <span class="hljs-literal">null</span>, |
| <span class="hljs-attr">"host"</span>: <span class="hljs-string">"localhost:8082"</span>, |
| <span class="hljs-attr">"sql"</span>: <span class="hljs-string">"SELECT * FROM wikipedia WHERE cityName = 'Buenos Aires'"</span> |
| }, |
| { |
| <span class="hljs-attr">"feed"</span>: <span class="hljs-string">"myRequestLogFeed"</span>, |
| <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2022-01-06T20:32:07.652Z"</span>, |
| <span class="hljs-attr">"remoteAddr"</span>: <span class="hljs-string">""</span>, |
| <span class="hljs-attr">"service"</span>: <span class="hljs-string">"druid/broker"</span>, |
| <span class="hljs-attr">"sqlQueryContext"</span>: |
| {}, |
| <span class="hljs-attr">"queryStats"</span>: |
| { |
| <span class="hljs-attr">"query/time"</span>: <span class="hljs-number">16</span>, |
| <span class="hljs-attr">"query/bytes"</span>: <span class="hljs-number">-1</span>, |
| <span class="hljs-attr">"success"</span>: <span class="hljs-literal">true</span>, |
| <span class="hljs-attr">"identity"</span>: <span class="hljs-string">"allowAll"</span> |
| }, |
| <span class="hljs-attr">"query"</span>: |
| { |
| <span class="hljs-attr">"queryType"</span>: <span class="hljs-string">"scan"</span>, |
| <span class="hljs-attr">"dataSource"</span>: |
| { |
| <span class="hljs-attr">"type"</span>: <span class="hljs-string">"table"</span>, |
| <span class="hljs-attr">"name"</span>: <span class="hljs-string">"wikipedia"</span> |
| }, |
| <span class="hljs-attr">"intervals"</span>: |
| { |
| <span class="hljs-attr">"type"</span>: <span class="hljs-string">"intervals"</span>, |
| <span class="hljs-attr">"intervals"</span>: |
| [ |
| <span class="hljs-string">"-146136543-09-08T08:23:32.096Z/146140482-04-24T15:36:27.903Z"</span> |
| ] |
| }, |
| <span class="hljs-attr">"virtualColumns"</span>: |
| [ |
| { |
| <span class="hljs-attr">"type"</span>: <span class="hljs-string">"expression"</span>, |
| <span class="hljs-attr">"name"</span>: <span class="hljs-string">"v0"</span>, |
| <span class="hljs-attr">"expression"</span>: <span class="hljs-string">"'Buenos Aires'"</span>, |
| <span class="hljs-attr">"outputType"</span>: <span class="hljs-string">"STRING"</span> |
| } |
| ], |
| <span class="hljs-attr">"resultFormat"</span>: <span class="hljs-string">"compactedList"</span>, |
| <span class="hljs-attr">"batchSize"</span>: <span class="hljs-number">20480</span>, |
| <span class="hljs-attr">"limit"</span>: <span class="hljs-number">101</span>, |
| <span class="hljs-attr">"filter"</span>: |
| { |
| <span class="hljs-attr">"type"</span>: <span class="hljs-string">"selector"</span>, |
| <span class="hljs-attr">"dimension"</span>: <span class="hljs-string">"cityName"</span>, |
| <span class="hljs-attr">"value"</span>: <span class="hljs-string">"Buenos Aires"</span>, |
| <span class="hljs-attr">"extractionFn"</span>: <span class="hljs-literal">null</span> |
| }, |
| <span class="hljs-attr">"columns"</span>: |
| [ |
| <span class="hljs-string">"__time"</span>, |
| <span class="hljs-string">"added"</span>, |
| <span class="hljs-string">"channel"</span>, |
| <span class="hljs-string">"comment"</span>, |
| <span class="hljs-string">"commentLength"</span>, |
| <span class="hljs-string">"countryIsoCode"</span>, |
| <span class="hljs-string">"countryName"</span>, |
| <span class="hljs-string">"deleted"</span>, |
| <span class="hljs-string">"delta"</span>, |
| <span class="hljs-string">"deltaBucket"</span>, |
| <span class="hljs-string">"diffUrl"</span>, |
| <span class="hljs-string">"flags"</span>, |
| <span class="hljs-string">"isAnonymous"</span>, |
| <span class="hljs-string">"isMinor"</span>, |
| <span class="hljs-string">"isNew"</span>, |
| <span class="hljs-string">"isRobot"</span>, |
| <span class="hljs-string">"isUnpatrolled"</span>, |
| <span class="hljs-string">"metroCode"</span>, |
| <span class="hljs-string">"namespace"</span>, |
| <span class="hljs-string">"page"</span>, |
| <span class="hljs-string">"regionIsoCode"</span>, |
| <span class="hljs-string">"regionName"</span>, |
| <span class="hljs-string">"user"</span>, |
| <span class="hljs-string">"v0"</span> |
| ], |
| <span class="hljs-attr">"legacy"</span>: <span class="hljs-literal">false</span>, |
| <span class="hljs-attr">"context"</span>: |
| { |
| <span class="hljs-attr">"populateCache"</span>: <span class="hljs-literal">false</span>, |
| <span class="hljs-attr">"queryId"</span>: <span class="hljs-string">"62e3d373-6e50-41b4-873b-1e56347c2950"</span>, |
| <span class="hljs-attr">"sqlOuterLimit"</span>: <span class="hljs-number">101</span>, |
| <span class="hljs-attr">"sqlQueryId"</span>: <span class="hljs-string">"cbb3d519-aee9-4566-8920-dbbeab6269f5"</span>, |
| <span class="hljs-attr">"useApproximateCountDistinct"</span>: <span class="hljs-literal">false</span>, |
| <span class="hljs-attr">"useApproximateTopN"</span>: <span class="hljs-literal">false</span>, |
| <span class="hljs-attr">"useCache"</span>: <span class="hljs-literal">false</span> |
| }, |
| <span class="hljs-attr">"descending"</span>: <span class="hljs-literal">false</span>, |
| <span class="hljs-attr">"granularity"</span>: |
| { |
| <span class="hljs-attr">"type"</span>: <span class="hljs-string">"all"</span> |
| } |
| }, |
| <span class="hljs-attr">"host"</span>: <span class="hljs-string">"localhost:8082"</span>, |
| <span class="hljs-attr">"sql"</span>: <span class="hljs-literal">null</span> |
| }, |
| ... |
| ] |
| </code></pre> |
| <h2><a class="anchor" aria-hidden="true" id="learn-more"></a><a href="#learn-more" 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>Learn more</h2> |
| <p>See the following topics for more information.</p> |
| <ul> |
| <li><a href="/docs/0.23.0/operations/metrics.html#query-metrics">Query metrics</a></li> |
| <li><a href="/docs/0.23.0/configuration/index.html#request-logging">Request logging configuration</a></li> |
| <li><a href="/docs/0.23.0/configuration/index.html#metrics-emitters">Metrics emitters configuration</a></li> |
| </ul> |
| </span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.23.0/operations/clean-metadata-store.html"><span class="arrow-prev">← </span><span>Automated metadata cleanup</span></a><a class="docs-next button" href="/docs/0.23.0/operations/metrics.html"><span>Metrics</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#configure-request-logging">Configure request logging</a></li><li><a href="#configure-metrics-emission">Configure metrics emission</a></li><li><a href="#example">Example</a></li><li><a href="#learn-more">Learn more</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.23.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>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></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script> |
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