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class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/latest/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/latest/tutorials/index.html">Quickstart (local)</a></li><li class="navListItem"><a class="navItem" href="/docs/latest/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/latest/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Tutorials<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 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href="/docs/latest/querying/sorting-orders.html">String comparators</a></li><li class="navListItem"><a class="navItem" href="/docs/latest/querying/virtual-columns.html">Virtual columns</a></li><li class="navListItem"><a class="navItem" href="/docs/latest/development/geo.html">Spatial filters</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Configuration<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/latest/configuration/index.html">Configuration reference</a></li><li class="navListItem"><a class="navItem" href="/docs/latest/development/extensions.html">Extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/latest/configuration/logging.html">Logging</a></li></ul></div><div 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| <h2><a class="anchor" aria-hidden="true" id="by-time-range-manually"></a><a href="#by-time-range-manually" 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>By time range, manually</h2> |
| <p>Apache Druid stores data <a href="/docs/latest/design/architecture.html#datasources-and-segments">partitioned by time chunk</a> and supports |
| deleting data for time chunks by dropping segments. This is a fast, metadata-only operation.</p> |
| <p>Deletion by time range happens in two steps:</p> |
| <ol> |
| <li>Segments to be deleted must first be marked as <a href="/docs/latest/design/architecture.html#segment-lifecycle">"unused"</a>. This can |
| happen when a segment is dropped by a <a href="/docs/latest/operations/rule-configuration.html">drop rule</a> or when you manually mark a |
| segment unused through the Coordinator API or web console. This is a soft delete: the data is not available for |
| querying, but the segment files remains in deep storage, and the segment records remains in the metadata store.</li> |
| <li>Once a segment is marked "unused", you can use a <a href="#kill-task"><code>kill</code> task</a> to permanently delete the segment file from |
| deep storage and remove its record from the metadata store. This is a hard delete: the data is unrecoverable unless |
| you have a backup.</li> |
| </ol> |
| <p>For documentation on disabling segments using the Coordinator API, see the |
| <a href="/docs/latest/operations/api-reference.html#coordinator-datasources">Coordinator API reference</a>.</p> |
| <p>A data deletion tutorial is available at <a href="/docs/latest/tutorials/tutorial-delete-data.html">Tutorial: Deleting data</a>.</p> |
| <h2><a class="anchor" aria-hidden="true" id="by-time-range-automatically"></a><a href="#by-time-range-automatically" 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>By time range, automatically</h2> |
| <p>Druid supports <a href="/docs/latest/operations/rule-configuration.html">load and drop rules</a>, which are used to define intervals of time |
| where data should be preserved, and intervals where data should be discarded. Data that falls under a drop rule is |
| marked unused, in the same manner as if you <a href="#by-time-range-manually">manually mark that time range unused</a>. This is a |
| fast, metadata-only operation.</p> |
| <p>Data that is dropped in this way is marked unused, but remains in deep storage. To permanently delete it, use a |
| <a href="#kill-task"><code>kill</code> task</a>.</p> |
| <h2><a class="anchor" aria-hidden="true" id="specific-records"></a><a href="#specific-records" 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>Specific records</h2> |
| <p>Druid supports deleting specific records using <a href="/docs/latest/data-management/update.html#reindex">reindexing</a> with a filter. The filter specifies which |
| data remains after reindexing, so it must be the inverse of the data you want to delete. Because segments must be |
| rewritten to delete data in this way, it can be a time-consuming operation.</p> |
| <p>For example, to delete records where <code>userName</code> is <code>'bob'</code> with native batch indexing, use a |
| <a href="/docs/latest/ingestion/ingestion-spec.html#transformspec"><code>transformSpec</code></a> with filter <code>{"type": "not", "field": {"type": "selector", "dimension": "userName", "value": "bob"}}</code>.</p> |
| <p>To delete the same records using SQL, use <a href="/docs/latest/multi-stage-query/concepts.html#replace">REPLACE</a> with <code>WHERE userName <> 'bob'</code>.</p> |
| <p>To reindex using <a href="/docs/latest/ingestion/native-batch.html">native batch</a>, use the <a href="/docs/latest/ingestion/native-batch-input-sources.html#druid-input-source"><code>druid</code> input |
| source</a>. If needed, |
| <a href="/docs/latest/ingestion/ingestion-spec.html#transformspec"><code>transformSpec</code></a> can be used to filter or modify data during the |
| reindexing job. To reindex with SQL, use <a href="/docs/latest/multi-stage-query/reference.html#replace"><code>REPLACE <table> OVERWRITE</code></a> |
| with <code>SELECT ... FROM <table></code>. (Druid does not have <code>UPDATE</code> or <code>ALTER TABLE</code> statements.) Any SQL SELECT query can be |
| used to filter, modify, or enrich the data during the reindexing job.</p> |
| <p>Data that is deleted in this way is marked unused, but remains in deep storage. To permanently delete it, use a <a href="#kill-task"><code>kill</code> |
| task</a>.</p> |
| <h2><a class="anchor" aria-hidden="true" id="entire-table"></a><a href="#entire-table" 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>Entire table</h2> |
| <p>Deleting an entire table works the same way as <a href="#by-time-range-manually">deleting part of a table by time range</a>. First, |
| mark all segments unused using the Coordinator API or web console. Then, optionally, delete it permanently using a |
| <a href="#kill-task"><code>kill</code> task</a>.</p> |
| <p><a name="kill-task"></a></p> |
| <h2><a class="anchor" aria-hidden="true" id="permanently-kill-task"></a><a href="#permanently-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>Permanently (<code>kill</code> task)</h2> |
| <p>Data that has been overwritten or soft-deleted still remains as segments that have been marked unused. You can use a |
| <code>kill</code> task to permanently delete this data.</p> |
| <p>The available grammar is:</p> |
| <pre><code class="hljs css language-json">{ |
| <span class="hljs-attr">"type"</span>: <span class="hljs-string">"kill"</span>, |
| <span class="hljs-attr">"id"</span>: <task_id>, |
| <span class="hljs-attr">"dataSource"</span>: <task_datasource>, |
| <span class="hljs-attr">"interval"</span> : <all_unused_segments_in_this_interval_will_die!>, |
| <span class="hljs-attr">"context"</span>: <task context> |
| } |
| </code></pre> |
| <p><strong>WARNING:</strong> The <code>kill</code> task permanently removes all information about the affected segments from the metadata store and |
| deep storage. This operation cannot be undone.</p> |
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