<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Tutorial: Deleting data · Apache Druid</title><meta name="viewport" content="width=device-width"/><link rel="canonical" href="https://druid.apache.org/docs/0.18.0/tutorials/tutorial-delete-data.html"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:language" content="en"/><meta name="docsearch:version" content="0.18.0" /><meta property="og:title" content="Tutorial: Deleting data · 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/docsearch.js/1/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>This tutorial demonstrates how to delete existing data.</p>
<p>For this tutorial, we'll assume you've already downloaded Apache Druid as described in
the <a href="index.html">single-machine quickstart</a> and have it running on your local machine.</p>
<h2><a class="anchor" aria-hidden="true" id="load-initial-data"></a><a href="#load-initial-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 initial data</h2>
<p>In this tutorial, we will use the Wikipedia edits data, with an indexing spec that creates hourly segments. This spec is located at <code>quickstart/tutorial/deletion-index.json</code>, and it creates a datasource called <code>deletion-tutorial</code>.</p>
<p>Let's load this initial data:</p>
<pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/deletion-index.json --url http://localhost:8081
</code></pre>
<p>When the load finishes, open <a href="http://localhost:8888/unified-console.html#datasources">http://localhost:8888/unified-console.html#datasources</a> in a browser.</p>
<h2><a class="anchor" aria-hidden="true" id="how-to-permanently-delete-data"></a><a href="#how-to-permanently-delete-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>How to permanently delete data</h2>
<p>Permanent deletion of a Druid segment has two steps:</p>
<ol>
<li>The segment must first be marked as &quot;unused&quot;. This occurs when a user manually disables a segment through the Coordinator API.</li>
<li>After segments have been marked as &quot;unused&quot;, a Kill Task will delete any &quot;unused&quot; segments from Druid's metadata store as well as deep storage.</li>
</ol>
<p>Let's drop some segments now, by using the coordinator API to drop data by interval and segmentIds.</p>
<h2><a class="anchor" aria-hidden="true" id="disable-segments-by-interval"></a><a href="#disable-segments-by-interval" 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>Disable segments by interval</h2>
<p>Let's disable segments in a specified interval. This will mark all segments in the interval as &quot;unused&quot;, but not remove them from deep storage.
Let's disable segments in interval <code>2015-09-12T18:00:00.000Z/2015-09-12T20:00:00.000Z</code> i.e. between hour 18 and 20.</p>
<pre><code class="hljs css language-bash">curl -X <span class="hljs-string">'POST'</span> -H <span class="hljs-string">'Content-Type:application/json'</span> -d <span class="hljs-string">'{ "interval" : "2015-09-12T18:00:00.000Z/2015-09-12T20:00:00.000Z" }'</span> http://localhost:8081/druid/coordinator/v1/datasources/deletion-tutorial/markUnused
</code></pre>
<p>After that command completes, you should see that the segment for hour 18 and 19 have been disabled:</p>
<p><img src="../assets/tutorial-deletion-02.png" alt="Segments 2" title="Segments 2"></p>
<p>Note that the hour 18 and 19 segments are still present in deep storage:</p>
<pre><code class="hljs css language-bash">$ ls -l1 var/druid/segments/deletion-tutorial/
2015-09-12T00:00:00.000Z_2015-09-12T01:00:00.000Z
2015-09-12T01:00:00.000Z_2015-09-12T02:00:00.000Z
2015-09-12T02:00:00.000Z_2015-09-12T03:00:00.000Z
2015-09-12T03:00:00.000Z_2015-09-12T04:00:00.000Z
2015-09-12T04:00:00.000Z_2015-09-12T05:00:00.000Z
2015-09-12T05:00:00.000Z_2015-09-12T06:00:00.000Z
2015-09-12T06:00:00.000Z_2015-09-12T07:00:00.000Z
2015-09-12T07:00:00.000Z_2015-09-12T08:00:00.000Z
2015-09-12T08:00:00.000Z_2015-09-12T09:00:00.000Z
2015-09-12T09:00:00.000Z_2015-09-12T10:00:00.000Z
2015-09-12T10:00:00.000Z_2015-09-12T11:00:00.000Z
2015-09-12T11:00:00.000Z_2015-09-12T12:00:00.000Z
2015-09-12T12:00:00.000Z_2015-09-12T13:00:00.000Z
2015-09-12T13:00:00.000Z_2015-09-12T14:00:00.000Z
2015-09-12T14:00:00.000Z_2015-09-12T15:00:00.000Z
2015-09-12T15:00:00.000Z_2015-09-12T16:00:00.000Z
2015-09-12T16:00:00.000Z_2015-09-12T17:00:00.000Z
2015-09-12T17:00:00.000Z_2015-09-12T18:00:00.000Z
2015-09-12T18:00:00.000Z_2015-09-12T19:00:00.000Z
2015-09-12T19:00:00.000Z_2015-09-12T20:00:00.000Z
2015-09-12T20:00:00.000Z_2015-09-12T21:00:00.000Z
2015-09-12T21:00:00.000Z_2015-09-12T22:00:00.000Z
2015-09-12T22:00:00.000Z_2015-09-12T23:00:00.000Z
2015-09-12T23:00:00.000Z_2015-09-13T00:00:00.000Z
</code></pre>
<h2><a class="anchor" aria-hidden="true" id="disable-segments-by-segment-ids"></a><a href="#disable-segments-by-segment-ids" 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>Disable segments by segment IDs</h2>
<p>Let's disable some segments by their segmentID. This will again mark the segments as &quot;unused&quot;, but not remove them from deep storage. You can see the full segmentID for a segment from UI as explained below.</p>
<p>In the <a href="http://localhost:8888/unified-console.html#segments">segments view</a>, click the arrow on the left side of one of the remaining segments to expand the segment entry:</p>
<p><img src="../assets/tutorial-deletion-01.png" alt="Segments" title="Segments"></p>
<p>The top of the info box shows the full segment ID, e.g. <code>deletion-tutorial_2015-09-12T14:00:00.000Z_2015-09-12T15:00:00.000Z_2019-02-28T01:11:51.606Z</code> for the segment of hour 14.</p>
<p>Let's disable the hour 13 and 14 segments by sending a POST request to the Coordinator with this payload</p>
<pre><code class="hljs css language-json">{
  <span class="hljs-attr">"segmentIds"</span>:
  [
    <span class="hljs-string">"deletion-tutorial_2015-09-12T13:00:00.000Z_2015-09-12T14:00:00.000Z_2019-05-01T17:38:46.961Z"</span>,
    <span class="hljs-string">"deletion-tutorial_2015-09-12T14:00:00.000Z_2015-09-12T15:00:00.000Z_2019-05-01T17:38:46.961Z"</span>
  ]
}
</code></pre>
<p>This payload json has been provided at <code>quickstart/tutorial/deletion-disable-segments.json</code>. Submit the POST request to Coordinator like this:</p>
<pre><code class="hljs css language-bash">curl -X <span class="hljs-string">'POST'</span> -H <span class="hljs-string">'Content-Type:application/json'</span> -d @quickstart/tutorial/deletion-disable-segments.json http://localhost:8081/druid/coordinator/v1/datasources/deletion-tutorial/markUnused
</code></pre>
<p>After that command completes, you should see that the segments for hour 13 and 14 have been disabled:</p>
<p><img src="../assets/tutorial-deletion-03.png" alt="Segments 3" title="Segments 3"></p>
<p>Note that the hour 13 and 14 segments are still in deep storage:</p>
<pre><code class="hljs css language-bash">$ ls -l1 var/druid/segments/deletion-tutorial/
2015-09-12T00:00:00.000Z_2015-09-12T01:00:00.000Z
2015-09-12T01:00:00.000Z_2015-09-12T02:00:00.000Z
2015-09-12T02:00:00.000Z_2015-09-12T03:00:00.000Z
2015-09-12T03:00:00.000Z_2015-09-12T04:00:00.000Z
2015-09-12T04:00:00.000Z_2015-09-12T05:00:00.000Z
2015-09-12T05:00:00.000Z_2015-09-12T06:00:00.000Z
2015-09-12T06:00:00.000Z_2015-09-12T07:00:00.000Z
2015-09-12T07:00:00.000Z_2015-09-12T08:00:00.000Z
2015-09-12T08:00:00.000Z_2015-09-12T09:00:00.000Z
2015-09-12T09:00:00.000Z_2015-09-12T10:00:00.000Z
2015-09-12T10:00:00.000Z_2015-09-12T11:00:00.000Z
2015-09-12T11:00:00.000Z_2015-09-12T12:00:00.000Z
2015-09-12T12:00:00.000Z_2015-09-12T13:00:00.000Z
2015-09-12T13:00:00.000Z_2015-09-12T14:00:00.000Z
2015-09-12T14:00:00.000Z_2015-09-12T15:00:00.000Z
2015-09-12T15:00:00.000Z_2015-09-12T16:00:00.000Z
2015-09-12T16:00:00.000Z_2015-09-12T17:00:00.000Z
2015-09-12T17:00:00.000Z_2015-09-12T18:00:00.000Z
2015-09-12T18:00:00.000Z_2015-09-12T19:00:00.000Z
2015-09-12T19:00:00.000Z_2015-09-12T20:00:00.000Z
2015-09-12T20:00:00.000Z_2015-09-12T21:00:00.000Z
2015-09-12T21:00:00.000Z_2015-09-12T22:00:00.000Z
2015-09-12T22:00:00.000Z_2015-09-12T23:00:00.000Z
2015-09-12T23:00:00.000Z_2015-09-13T00:00:00.000Z
</code></pre>
<h2><a class="anchor" aria-hidden="true" id="run-a-kill-task"></a><a href="#run-a-kill-task" 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>Run a kill task</h2>
<p>Now that we have disabled some segments, we can submit a Kill Task, which will delete the disabled segments from metadata and deep storage.</p>
<p>A Kill Task spec has been provided at <code>quickstart/tutorial/deletion-kill.json</code>. Submit this task to the Overlord with the following command:</p>
<pre><code class="hljs css language-bash">curl -X <span class="hljs-string">'POST'</span> -H <span class="hljs-string">'Content-Type:application/json'</span> -d @quickstart/tutorial/deletion-kill.json http://localhost:8081/druid/indexer/v1/task
</code></pre>
<p>After this task completes, you can see that the disabled segments have now been removed from deep storage:</p>
<pre><code class="hljs css language-bash">$ ls -l1 var/druid/segments/deletion-tutorial/
2015-09-12T12:00:00.000Z_2015-09-12T13:00:00.000Z
2015-09-12T15:00:00.000Z_2015-09-12T16:00:00.000Z
2015-09-12T16:00:00.000Z_2015-09-12T17:00:00.000Z
2015-09-12T17:00:00.000Z_2015-09-12T18:00:00.000Z
2015-09-12T20:00:00.000Z_2015-09-12T21:00:00.000Z
2015-09-12T21:00:00.000Z_2015-09-12T22:00:00.000Z
2015-09-12T22:00:00.000Z_2015-09-12T23:00:00.000Z
2015-09-12T23:00:00.000Z_2015-09-13T00:00:00.000Z
</code></pre>
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