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padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Tutorials</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Compact segments</span><meta itemprop="position" content="2"></li></ul></nav><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>Compact segments</h1></header><p>This tutorial demonstrates how to compact existing segments into fewer but larger segments in Apache Druid.</p><p>There is some per-segment memory and processing overhead during query processing. |
| Therefore, it can be beneficial to reduce the total number of segments. |
| See <a href="/docs/latest/operations/segment-optimization">Segment size optimization</a> for details.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="prerequisites">Prerequisites<a href="#prerequisites" class="hash-link" aria-label="Direct link to Prerequisites" title="Direct link to Prerequisites"></a></h2><p>This tutorial assumes you have already downloaded Apache Druid as described in |
| the <a href="/docs/latest/tutorials/">single-machine quickstart</a> and have it running on your local machine.</p><p>If you haven't already, you should finish the following tutorials first:</p><ul><li><a href="/docs/latest/tutorials/tutorial-batch">Tutorial: Loading a file</a></li><li><a href="/docs/latest/tutorials/tutorial-query">Tutorial: Querying data</a></li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="load-the-initial-data">Load the initial data<a href="#load-the-initial-data" class="hash-link" aria-label="Direct link to Load the initial data" title="Direct link to Load the initial data"></a></h2><p>This tutorial uses the Wikipedia edits sample data included with the Druid distribution. |
| To load the initial data, you use an ingestion spec that loads batch data with segment granularity of <code>HOUR</code> and creates between one and three segments per hour.</p><p>You can review the ingestion spec at <code>quickstart/tutorial/compaction-init-index.json</code>. |
| Submit the spec as follows to create a datasource called <code>compaction-tutorial</code>:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">bin/post-index-task --file quickstart/tutorial/compaction-init-index.json --url http://localhost:8081</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><div class="theme-admonition theme-admonition-info alert alert--info admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"></path></svg></span>info</div><div class="admonitionContent_S0QG"><p> <code>maxRowsPerSegment</code> in the tutorial ingestion spec is set to 1000 to generate multiple segments per hour for demonstration purposes. Do not use this spec in production.</p></div></div><p>After the ingestion completes, navigate to <a href="http://localhost:8888/unified-console.html#datasources" target="_blank" rel="noopener noreferrer">http://localhost:8888/unified-console.html#datasources</a> in a browser to see the new datasource in the web console.</p><p><img loading="lazy" alt="compaction-tutorial datasource" src="/assets/images/tutorial-compaction-01-122ba6887d51536c0799f2b4f105f00c.png" title="compaction-tutorial datasource" width="1274" height="228" class="img_ev3q"></p><p>In the <strong>Availability</strong> column for the <code>compaction-tutorial</code> datasource, click the link for <strong>51 segments</strong> to view segments information for the datasource.</p><p>The datasource comprises 51 segments, between one and three segments per hour from the input data:</p><p><img loading="lazy" alt="Original segments" src="/assets/images/tutorial-compaction-02-3e62bb856c0c0cf0b318520c7d071bb5.png" title="Original segments" width="1275" height="772" class="img_ev3q"></p><p>Run a COUNT query on the datasource to verify there are 39,244 rows:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">dsql</span><span class="token operator" style="color:rgb(137, 221, 255)">></span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">select</span><span class="token plain"> count</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">*</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> from </span><span class="token string" style="color:rgb(195, 232, 141)">"compaction-tutorial"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">┌────────┐</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ EXPR</span><span class="token variable" style="color:rgb(191, 199, 213)">$0</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">├────────┤</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">39244</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">└────────┘</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">Retrieved </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> row </span><span class="token keyword" style="font-style:italic">in</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain">.38s.</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="compact-the-data">Compact the data<a href="#compact-the-data" class="hash-link" aria-label="Direct link to Compact the data" title="Direct link to Compact the data"></a></h2><p>Now you compact these 51 small segments and retain the segment granularity of <code>HOUR</code>. |
| The Druid distribution includes a compaction task spec for this tutorial datasource at <code>quickstart/tutorial/compaction-keep-granularity.json</code>:</p><div class="language-json codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-json codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"type"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"compact"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"dataSource"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"compaction-tutorial"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"interval"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"2015-09-12/2015-09-13"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"tuningConfig"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"type"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"index_parallel"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"partitionsSpec"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"type"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"dynamic"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"maxRowsInMemory"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">25000</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>This compacts all segments for the interval <code>2015-09-12/2015-09-13</code> in the <code>compaction-tutorial</code> datasource.</p><p>The parameters in the <code>tuningConfig</code> control the maximum number of rows present in each compacted segment and thus affect the number of segments in the compacted set.</p><p>This datasource only has 39,244 rows. 39,244 is below the default limit of 5,000,000 <code>maxRowsPerSegment</code> for <a href="/docs/latest/ingestion/native-batch#dynamic-partitioning">dynamic partitioning</a>. Therefore, Druid only creates one compacted segment per hour.</p><p>Submit the compaction task now:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">bin/post-index-task --file quickstart/tutorial/compaction-keep-granularity.json --url http://localhost:8081</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>After the task finishes, refresh the <a href="http://localhost:8888/unified-console.html#segments" target="_blank" rel="noopener noreferrer">segments view</a>.</p><p>Over time the Coordinator marks the original 51 segments as unused and subsequently removes them to leave only the new compacted segments.</p><p>By default, the Coordinator does not mark segments as unused until the Coordinator has been running for at least 15 minutes. |
| During that time, you may see 75 total segments comprised of the old segment set and the new compacted set:</p><p><img loading="lazy" alt="Compacted segments intermediate state 1" src="/assets/images/tutorial-compaction-03-7fdb3f2fed5120f81ff7fa1b0659b1da.png" title="Compacted segments intermediate state 1" width="1334" height="175" class="img_ev3q"></p><p><img loading="lazy" alt="Compacted segments intermediate state 2" src="/assets/images/tutorial-compaction-04-36f7ed804ee7538d35d6fe31da6fbfae.png" title="Compacted segments intermediate state 2" width="1334" height="792" class="img_ev3q"></p><p>The new compacted segments have a more recent version than the original segments. |
| Even though the web console displays both sets of segments, queries only read from the new compacted segments.</p><p>Run a COUNT query on <code>compaction-tutorial</code> again to verify the number of rows remains 39,244:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">dsql</span><span class="token operator" style="color:rgb(137, 221, 255)">></span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">select</span><span class="token plain"> count</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">*</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> from </span><span class="token string" style="color:rgb(195, 232, 141)">"compaction-tutorial"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">┌────────┐</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ EXPR</span><span class="token variable" style="color:rgb(191, 199, 213)">$0</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">├────────┤</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">│ </span><span class="token number" style="color:rgb(247, 140, 108)">39244</span><span class="token plain"> │</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">└────────┘</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">Retrieved </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain"> row </span><span class="token keyword" style="font-style:italic">in</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1</span><span class="token plain">.30s.</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>After the Coordinator has been running for at least 15 minutes, the segments view only shows the new 24 segments, one for each hour:</p><p><img loading="lazy" alt="Compacted segments hourly granularity 1" src="/assets/images/tutorial-compaction-05-c6b86c4a1c1aeeccad0e4567f43f7112.png" title="Compacted segments hourly granularity 1" width="1330" height="164" class="img_ev3q"></p><p><img loading="lazy" alt="Compacted segments hourly granularity 2" src="/assets/images/tutorial-compaction-06-d55426f79668b103a03066b3fb602d1b.png" title="Compacted segments hourly granularity 2" width="1330" height="896" class="img_ev3q"></p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="compact-the-data-with-new-segment-granularity">Compact the data with new segment granularity<a href="#compact-the-data-with-new-segment-granularity" class="hash-link" aria-label="Direct link to Compact the data with new segment granularity" title="Direct link to Compact the data with new segment granularity"></a></h2><p>You can also change the segment granularity in a compaction task to produce compacted segments with a different granularity from that of the input segments.</p><p>The Druid distribution includes a compaction task spec to create <code>DAY</code> granularity segments at <code>quickstart/tutorial/compaction-day-granularity.json</code>:</p><div class="language-json codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-json codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"type"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"compact"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"dataSource"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"compaction-tutorial"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"interval"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"2015-09-12/2015-09-13"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"tuningConfig"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"type"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"index_parallel"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"partitionsSpec"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"type"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"dynamic"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"maxRowsInMemory"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">25000</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"forceExtendableShardSpecs"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token boolean" style="color:rgb(255, 88, 116)">true</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"granularitySpec"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"segmentGranularity"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"DAY"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"queryGranularity"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"none"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Note that <code>segmentGranularity</code> is set to <code>DAY</code> in this compaction task spec.</p><p>Submit this task now:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">bin/post-index-task --file quickstart/tutorial/compaction-day-granularity.json --url http://localhost:8081</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>It takes some time before the Coordinator marks the old input segments as unused, so you may see an intermediate state with 25 total segments. Eventually, only one DAY granularity segment remains:</p><p><img loading="lazy" alt="Compacted segments day granularity 1" src="/assets/images/tutorial-compaction-07-e6e0a2617410595ee7ce54d48ea43e7b.png" title="Compacted segments day granularity 1" width="1331" height="181" class="img_ev3q"></p><p><img loading="lazy" alt="Compacted segments day granularity 2" src="/assets/images/tutorial-compaction-08-c185270edb96314c1d83efeb308b4bf3.png" title="Compacted segments day granularity 2" width="1334" height="171" class="img_ev3q"></p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="learn-more">Learn more<a href="#learn-more" class="hash-link" aria-label="Direct link to Learn more" title="Direct link to Learn more"></a></h2><p>This tutorial demonstrated how to use a compaction task spec to manually compact segments and how to optionally change the segment granularity for segments.</p><ul><li>For more details, see <a href="/docs/latest/data-management/compaction">Compaction</a>.</li><li>To learn about the benefits of compaction, see <a href="/docs/latest/operations/segment-optimization">Segment optimization</a>.</li></ul></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/latest/tutorials/tutorial-update-data"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Update existing data</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/latest/tutorials/tutorial-delete-data"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Deleting data</div></a></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="#prerequisites" class="table-of-contents__link toc-highlight">Prerequisites</a></li><li><a href="#load-the-initial-data" class="table-of-contents__link toc-highlight">Load the initial data</a></li><li><a href="#compact-the-data" class="table-of-contents__link toc-highlight">Compact the data</a></li><li><a href="#compact-the-data-with-new-segment-granularity" class="table-of-contents__link toc-highlight">Compact the data with new segment granularity</a></li><li><a href="#learn-more" class="table-of-contents__link toc-highlight">Learn more</a></li></ul></div></div></div></div></main></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="themedImage_ToTc themedImage--light_HNdA footer__logo"><img src="/img/favicon.png" class="themedImage_ToTc themedImage--dark_i4oU footer__logo"></div><div class="footer__copyright">Copyright © 2023 Apache Software Foundation. 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