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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">Operations</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">Durable storage</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>Durable storage for the multi-stage query engine</h1></header><p>You can use durable storage to improve querying from deep storage and SQL-based ingestion.</p><blockquote><p>Note that only S3 is supported as a durable storage location.</p></blockquote><p>Durable storage for queries from deep storage provides a location where you can write the results of deep storage queries to. Durable storage for SQL-based ingestion is used to temporarily house intermediate files, which can improve reliability.</p><p>Enabling durable storage also enables the use of local disk to store temporary files, such as the intermediate files produced |
| while sorting the data. Tasks will use whatever has been configured for their temporary usage as described in <a href="/docs/27.0.0/ingestion/tasks#configuring-task-storage-sizes">Configuring task storage sizes</a>. |
| If the configured limit is too low, Druid may throw the error, <code>NotEnoughTemporaryStorageFault</code>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="enable-durable-storage">Enable durable storage<a href="#enable-durable-storage" class="hash-link" aria-label="Direct link to Enable durable storage" title="Direct link to Enable durable storage"></a></h2><p>To enable durable storage, you need to set the following common service properties:</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">druid.msq.intermediate.storage.enable=true</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">druid.msq.intermediate.storage.type=s3</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">druid.msq.intermediate.storage.bucket=YOUR_BUCKET</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">druid.msq.intermediate.storage.prefix=YOUR_PREFIX</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">druid.msq.intermediate.storage.tempDir=/path/to/your/temp/dir</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>For detailed information about the settings related to durable storage, see <a href="/docs/27.0.0/multi-stage-query/reference#durable-storage-configurations">Durable storage configurations</a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="use-durable-storage-for-sql-based-ingestion-queries">Use durable storage for SQL-based ingestion queries<a href="#use-durable-storage-for-sql-based-ingestion-queries" class="hash-link" aria-label="Direct link to Use durable storage for SQL-based ingestion queries" title="Direct link to Use durable storage for SQL-based ingestion queries"></a></h2><p>When you run a query, include the context parameter <code>durableShuffleStorage</code> and set it to <code>true</code>.</p><p>For queries where you want to use fault tolerance for workers, set <code>faultTolerance</code> to <code>true</code>, which automatically sets <code>durableShuffleStorage</code> to <code>true</code>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="use-durable-storage-for-queries-from-deep-storage">Use durable storage for queries from deep storage<a href="#use-durable-storage-for-queries-from-deep-storage" class="hash-link" aria-label="Direct link to Use durable storage for queries from deep storage" title="Direct link to Use durable storage for queries from deep storage"></a></h2><p>Depending on the size of the results you're expecting, saving the final results for queries from deep storage to durable storage might be needed.</p><p>By default, Druid saves the final results for queries from deep storage to task reports. Generally, this is acceptable for smaller result sets but may lead to timeouts for larger result sets. </p><p>When you run a query, include the context parameter <code>selectDestination</code> and set it to <code>DURABLESTORAGE</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 plain"> </span><span class="token property">"context"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</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"> </span><span class="token property">"selectDestination"</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)">"DURABLESTORAGE"</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>You can also write intermediate results to durable storage (<code>durableShuffleStorage</code>) for better reliability. The location where workers write intermediate results is different than the location where final results get stored. This means that durable storage for results can be enabled even if you don't write intermediate results to durable storage. </p><p>If you write the results for queries from deep storage to durable storage, the results are cleaned up when the task is removed from the metadata store. </p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="durable-storage-clean-up">Durable storage clean up<a href="#durable-storage-clean-up" class="hash-link" aria-label="Direct link to Durable storage clean up" title="Direct link to Durable storage clean up"></a></h2><p>To prevent durable storage from getting filled up with temporary files in case the tasks fail to clean them up, a periodic |
| cleaner can be scheduled to clean the directories corresponding to which there isn't a controller task running. It utilizes |
| the storage connector to work upon the durable storage. The durable storage location should only be utilized to store the output |
| for the cluster's MSQ tasks. If the location contains other files or directories, then they will get cleaned up as well.</p><p>Use <code>druid.msq.intermediate.storage.cleaner.enabled</code> and <code>druid.msq.intermediate.storage.cleaner.delaySEconds</code> to configure the cleaner. For more information, see <a href="/docs/27.0.0/multi-stage-query/reference#durable-storage-configurations">Durable storage configurations</a>.</p><p>Note that if you choose to write query results to durable storage,the results are cleaned up when the task is removed from the metadata store.</p></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/27.0.0/operations/java"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Java runtime</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/27.0.0/operations/security-overview"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Security overview</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="#enable-durable-storage" class="table-of-contents__link toc-highlight">Enable durable storage</a></li><li><a href="#use-durable-storage-for-sql-based-ingestion-queries" class="table-of-contents__link toc-highlight">Use durable storage for SQL-based ingestion queries</a></li><li><a href="#use-durable-storage-for-queries-from-deep-storage" class="table-of-contents__link toc-highlight">Use durable storage for queries from deep storage</a></li><li><a href="#durable-storage-clean-up" class="table-of-contents__link toc-highlight">Durable storage clean up</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. Except where otherwise noted, licensed under CC BY-SA 4.0. 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></div></footer></div> |
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