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<p>This tutorial demonstrates how to configure retention rules on a datasource to set the time intervals of data that will be retained or dropped.</p>
<p>For this tutorial, we'll assume you've already downloaded Apache Druid (incubating) as described in
the <a href="index.html">single-machine quickstart</a> and have it running on your local machine.</p>
<p>It will also be helpful to have finished <a href="/docs/latest/tutorials/tutorial-batch.html">Tutorial: Loading a file</a> and <a href="/docs/latest/tutorials/tutorial-query.html">Tutorial: Querying data</a>.</p>
<h2><a class="anchor" aria-hidden="true" id="load-the-example-data"></a><a href="#load-the-example-data" 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>Load the example data</h2>
<p>For this tutorial, we'll be using the Wikipedia edits sample data, with an ingestion task spec that will create a separate segment for each hour in the input data.</p>
<p>The ingestion spec can be found at <code>quickstart/tutorial/retention-index.json</code>. Let's submit that spec, which will create a datasource called <code>retention-tutorial</code>:</p>
<pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/retention-index.json --url http://localhost:8081
</code></pre>
<p>After the ingestion completes, go to <a href="http://localhost:8888/unified-console.html#datasources">http://localhost:8888/unified-console.html#datasources</a> in a browser to access the Druid Console's datasource view.</p>
<p>This view shows the available datasources and a summary of the retention rules for each datasource:</p>
<p><img src="../assets/tutorial-retention-01.png" alt="Summary" title="Summary"></p>
<p>Currently there are no rules set for the <code>retention-tutorial</code> datasource. Note that there are default rules for the cluster: load forever with 2 replicas in <code>_default_tier</code>.</p>
<p>This means that all data will be loaded regardless of timestamp, and each segment will be replicated to two Historical processes in the default tier.</p>
<p>In this tutorial, we will ignore the tiering and redundancy concepts for now.</p>
<p>Let's view the segments for the <code>retention-tutorial</code> datasource by clicking the &quot;24 Segments&quot; link next to &quot;Fully Available&quot;.</p>
<p>The segments view (<a href="http://localhost:8888/unified-console.html#segments">http://localhost:8888/unified-console.html#segments</a>) provides information about what segments a datasource contains. The page shows that there are 24 segments, each one containing data for a specific hour of 2015-09-12:</p>
<p><img src="../assets/tutorial-retention-02.png" alt="Original segments" title="Original segments"></p>
<h2><a class="anchor" aria-hidden="true" id="set-retention-rules"></a><a href="#set-retention-rules" 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>Set retention rules</h2>
<p>Suppose we want to drop data for the first 12 hours of 2015-09-12 and keep data for the later 12 hours of 2015-09-12.</p>
<p>Go to the <a href="http://localhost:8888/unified-console.html#datasources">datasources view</a> and click the blue pencil icon next to <code>Cluster default: loadForever</code> for the <code>retention-tutorial</code> datasource.</p>
<p>A rule configuration window will appear:</p>
<p><img src="../assets/tutorial-retention-03.png" alt="Rule configuration" title="Rule configuration"></p>
<p>Now click the <code>+ New rule</code> button twice.</p>
<p>In the upper rule box, select <code>Load</code> and <code>by interval</code>, and then enter <code>2015-09-12T12:00:00.000Z/2015-09-13T00:00:00.000Z</code> in field next to <code>by interval</code>. Replicas can remain at 2 in the <code>_default_tier</code>.</p>
<p>In the lower rule box, select <code>Drop</code> and <code>forever</code>.</p>
<p>The rules should look like this:</p>
<p><img src="../assets/tutorial-retention-04.png" alt="Set rules" title="Set rules"></p>
<p>Now click <code>Next</code>. The rule configuration process will ask for a user name and comment, for change logging purposes. You can enter <code>tutorial</code> for both.</p>
<p>Now click <code>Save</code>. You can see the new rules in the datasources view:</p>
<p><img src="../assets/tutorial-retention-05.png" alt="New rules" title="New rules"></p>
<p>Give the cluster a few minutes to apply the rule change, and go to the <a href="http://localhost:8888/unified-console.html#segments">segments view</a> in the Druid Console.
The segments for the first 12 hours of 2015-09-12 are now gone:</p>
<p><img src="../assets/tutorial-retention-06.png" alt="New segments" title="New segments"></p>
<p>The resulting retention rule chain is the following:</p>
<ol>
<li><p>loadByInterval 2015-09-12T12/2015-09-13 (12 hours)</p></li>
<li><p>dropForever</p></li>
<li><p>loadForever (default rule)</p></li>
</ol>
<p>The rule chain is evaluated from top to bottom, with the default rule chain always added at the bottom.</p>
<p>The tutorial rule chain we just created loads data if it is within the specified 12 hour interval.</p>
<p>If data is not within the 12 hour interval, the rule chain evaluates <code>dropForever</code> next, which will drop any data.</p>
<p>The <code>dropForever</code> terminates the rule chain, effectively overriding the default <code>loadForever</code> rule, which will never be reached in this rule chain.</p>
<p>Note that in this tutorial we defined a load rule on a specific interval.</p>
<p>If instead you want to retain data based on how old it is (e.g., retain data that ranges from 3 months in the past to the present time), you would define a Period load rule instead.</p>
<h2><a class="anchor" aria-hidden="true" id="further-reading"></a><a href="#further-reading" 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>Further reading</h2>
<ul>
<li><a href="/docs/latest/operations/rule-configuration.html">Load rules</a></li>
</ul>
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