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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">Ingestion</span><meta itemprop="position" content="1"></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">SQL-based batch</span><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">SQL-based ingestion</span><meta itemprop="position" content="3"></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>SQL-based ingestion</h1></header><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> This page describes SQL-based batch ingestion using the <a href="/docs/latest/multi-stage-query/"><code>druid-multi-stage-query</code></a> |
| extension, new in Druid 24.0. Refer to the <a href="/docs/latest/ingestion/#batch">ingestion methods</a> table to determine which |
| ingestion method is right for you.</p></div></div><p>Apache Druid supports SQL-based ingestion using the bundled <a href="#load-the-extension"><code>druid-multi-stage-query</code> extension</a>. |
| This extension adds a <a href="/docs/latest/multi-stage-query/concepts#multi-stage-query-task-engine">multi-stage query task engine for SQL</a> that allows running SQL |
| <a href="/docs/latest/multi-stage-query/concepts#insert">INSERT</a> and <a href="/docs/latest/multi-stage-query/concepts#replace">REPLACE</a> statements as batch tasks. As an experimental feature, |
| the task engine also supports running <code>SELECT</code> queries as batch tasks.</p><p>Nearly all <code>SELECT</code> capabilities are available in the multi-stage query (MSQ) task engine, with certain exceptions listed on the <a href="/docs/latest/multi-stage-query/known-issues#select-statement">Known |
| issues</a> page. This allows great flexibility to apply transformations, filters, JOINs, |
| aggregations, and so on as part of <code>INSERT ... SELECT</code> and <code>REPLACE ... SELECT</code> statements. This also allows in-database |
| transformation: creating new tables based on queries of other tables.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="vocabulary">Vocabulary<a href="#vocabulary" class="hash-link" aria-label="Direct link to Vocabulary" title="Direct link to Vocabulary"></a></h2><ul><li><p><strong>Controller</strong>: An indexing service task of type <code>query_controller</code> that manages |
| the execution of a query. There is one controller task per query.</p></li><li><p><strong>Worker</strong>: Indexing service tasks of type <code>query_worker</code> that execute a |
| query. There can be multiple worker tasks per query. Internally, |
| the tasks process items in parallel using their processing pools (up to <code>druid.processing.numThreads</code> of execution parallelism |
| within a worker task).</p></li><li><p><strong>Stage</strong>: A stage of query execution that is parallelized across |
| worker tasks. Workers exchange data with each other between stages.</p></li><li><p><strong>Partition</strong>: A slice of data output by worker tasks. In INSERT or REPLACE |
| queries, the partitions of the final stage become Druid segments.</p></li><li><p><strong>Shuffle</strong>: Workers exchange data between themselves on a per-partition basis in a process called |
| shuffling. During a shuffle, each output partition is sorted by a clustering key.</p></li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="load-the-extension">Load the extension<a href="#load-the-extension" class="hash-link" aria-label="Direct link to Load the extension" title="Direct link to Load the extension"></a></h2><p>To add the extension to an existing cluster, add <code>druid-multi-stage-query</code> to <code>druid.extensions.loadlist</code> in your |
| <code>common.runtime.properties</code> file.</p><p>For more information about how to load an extension, see <a href="/docs/latest/configuration/extensions#loading-extensions">Loading extensions</a>.</p><p>To use <a href="/docs/latest/multi-stage-query/reference#extern-function">EXTERN</a>, you need READ permission on the resource named "EXTERNAL" of the resource type |
| "EXTERNAL". If you encounter a 403 error when trying to use <code>EXTERN</code>, verify that you have the correct permissions. |
| The same is true of any of the input-source specific table function such as <code>S3</code> or <code>LOCALFILES</code>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="next-steps">Next steps<a href="#next-steps" class="hash-link" aria-label="Direct link to Next steps" title="Direct link to Next steps"></a></h2><ul><li><a href="/docs/latest/multi-stage-query/concepts">Read about key concepts</a> to learn more about how SQL-based ingestion and multi-stage queries work.</li><li><a href="/docs/latest/multi-stage-query/examples">Check out the examples</a> to see SQL-based ingestion in action.</li><li><a href="/docs/latest/operations/web-console">Explore the Query view</a> to get started in the web console.</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/ingestion/tasks"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Task reference</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/latest/multi-stage-query/concepts"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Key concepts</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="#vocabulary" class="table-of-contents__link toc-highlight">Vocabulary</a></li><li><a href="#load-the-extension" class="table-of-contents__link toc-highlight">Load the extension</a></li><li><a href="#next-steps" class="table-of-contents__link toc-highlight">Next steps</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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