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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 itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Overview</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>Ingestion overview</h1></header><p>Loading data in Druid is called <em>ingestion</em> or <em>indexing</em>. When you ingest data into Druid, Druid reads the data from |
| your source system and stores it in data files called <a href="/docs/27.0.0/design/architecture#datasources-and-segments"><em>segments</em></a>. |
| In general, segment files contain a few million rows each.</p><p>For most ingestion methods, the Druid <a href="/docs/27.0.0/design/middlemanager">MiddleManager</a> processes or the |
| <a href="/docs/27.0.0/design/indexer">Indexer</a> processes load your source data. The sole exception is Hadoop-based ingestion, which |
| uses a Hadoop MapReduce job on YARN.</p><p>During ingestion, Druid creates segments and stores them in <a href="/docs/27.0.0/design/deep-storage">deep storage</a>. Historical nodes load the segments into memory to respond to queries. For streaming ingestion, the Middle Managers and indexers can respond to queries in real-time with arriving data. See the <a href="/docs/27.0.0/design/architecture#storage-design">Storage design</a> section of the Druid design documentation for more information.</p><p>This topic introduces streaming and batch ingestion methods. The following topics describe ingestion concepts and information that apply to all <a href="#ingestion-methods">ingestion methods</a>:</p><ul><li><a href="/docs/27.0.0/ingestion/schema-model">Druid schema model</a> introduces concepts of datasources, primary timestamp, dimensions, and metrics.</li><li><a href="/docs/27.0.0/ingestion/rollup">Data rollup</a> describes rollup as a concept and provides suggestions to maximize the benefits of rollup.</li><li><a href="/docs/27.0.0/ingestion/partitioning">Partitioning</a> describes time chunk and secondary partitioning in Druid.</li><li><a href="/docs/27.0.0/ingestion/ingestion-spec">Ingestion spec reference</a> provides a reference for the configuration options in the ingestion spec.</li></ul><p>For additional information about concepts and configurations that are unique to each ingestion method, see the topic for the ingestion method.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="ingestion-methods">Ingestion methods<a href="#ingestion-methods" class="hash-link" aria-label="Direct link to Ingestion methods" title="Direct link to Ingestion methods"></a></h2><p>The tables below list Druid's most common data ingestion methods, along with comparisons to help you choose |
| the best one for your situation. Each ingestion method supports its own set of source systems to pull from. For details |
| about how each method works, as well as configuration properties specific to that method, check out its documentation |
| page.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="streaming">Streaming<a href="#streaming" class="hash-link" aria-label="Direct link to Streaming" title="Direct link to Streaming"></a></h3><p>There are two available options for streaming ingestion. Streaming ingestion is controlled by a continuously-running |
| supervisor.</p><table><thead><tr><th><strong>Method</strong></th><th><a href="/docs/27.0.0/development/extensions-core/kafka-ingestion">Kafka</a></th><th><a href="/docs/27.0.0/development/extensions-core/kinesis-ingestion">Kinesis</a></th></tr></thead><tbody><tr><td><strong>Supervisor type</strong></td><td><code>kafka</code></td><td><code>kinesis</code></td></tr><tr><td><strong>How it works</strong></td><td>Druid reads directly from Apache Kafka.</td><td>Druid reads directly from Amazon Kinesis.</td></tr><tr><td><strong>Can ingest late data?</strong></td><td>Yes.</td><td>Yes.</td></tr><tr><td><strong>Exactly-once guarantees?</strong></td><td>Yes.</td><td>Yes.</td></tr></tbody></table><h3 class="anchor anchorWithStickyNavbar_LWe7" id="batch">Batch<a href="#batch" class="hash-link" aria-label="Direct link to Batch" title="Direct link to Batch"></a></h3><p>There are three available options for batch ingestion. Batch ingestion jobs are associated with a controller task that |
| runs for the duration of the job.</p><table><thead><tr><th><strong>Method</strong></th><th><a href="/docs/27.0.0/ingestion/native-batch">Native batch</a></th><th><a href="/docs/27.0.0/multi-stage-query/">SQL</a></th><th><a href="/docs/27.0.0/ingestion/hadoop">Hadoop-based</a></th></tr></thead><tbody><tr><td><strong>Controller task type</strong></td><td><code>index_parallel</code></td><td><code>query_controller</code></td><td><code>index_hadoop</code></td></tr><tr><td><strong>How you submit it</strong></td><td>Send an <code>index_parallel</code> spec to the <a href="/docs/27.0.0/api-reference/tasks-api">Tasks API</a>.</td><td>Send an <a href="/docs/27.0.0/multi-stage-query/concepts#insert">INSERT</a> or <a href="/docs/27.0.0/multi-stage-query/concepts#replace">REPLACE</a> statement to the <a href="/docs/27.0.0/api-reference/sql-ingestion-api#submit-a-query">SQL task API</a>.</td><td>Send an <code>index_hadoop</code> spec to the <a href="/docs/27.0.0/api-reference/tasks-api">Tasks API</a>.</td></tr><tr><td><strong>Parallelism</strong></td><td>Using subtasks, if <a href="/docs/27.0.0/ingestion/native-batch#tuningconfig"><code>maxNumConcurrentSubTasks</code></a> is greater than 1.</td><td>Using <code>query_worker</code> subtasks.</td><td>Using YARN.</td></tr><tr><td><strong>Fault tolerance</strong></td><td>Workers automatically relaunched upon failure. Controller task failure leads to job failure.</td><td>Controller or worker task failure leads to job failure.</td><td>YARN containers automatically relaunched upon failure. Controller task failure leads to job failure.</td></tr><tr><td><strong>Can append?</strong></td><td>Yes.</td><td>Yes (INSERT).</td><td>No.</td></tr><tr><td><strong>Can overwrite?</strong></td><td>Yes.</td><td>Yes (REPLACE).</td><td>Yes.</td></tr><tr><td><strong>External dependencies</strong></td><td>None.</td><td>None.</td><td>Hadoop cluster.</td></tr><tr><td><strong>Input sources</strong></td><td>Any <a href="/docs/27.0.0/ingestion/input-sources"><code>inputSource</code></a>.</td><td>Any <a href="/docs/27.0.0/ingestion/input-sources"><code>inputSource</code></a> (using <a href="/docs/27.0.0/multi-stage-query/concepts#extern">EXTERN</a>) or Druid datasource (using FROM).</td><td>Any Hadoop FileSystem or Druid datasource.</td></tr><tr><td><strong>Input formats</strong></td><td>Any <a href="/docs/27.0.0/ingestion/data-formats#input-format"><code>inputFormat</code></a>.</td><td>Any <a href="/docs/27.0.0/ingestion/data-formats#input-format"><code>inputFormat</code></a>.</td><td>Any Hadoop InputFormat.</td></tr><tr><td><strong>Secondary partitioning options</strong></td><td>Dynamic, hash-based, and range-based partitioning methods are available. See <a href="/docs/27.0.0/ingestion/native-batch#partitionsspec">partitionsSpec</a> for details.</td><td>Range partitioning (<a href="/docs/27.0.0/multi-stage-query/concepts#clustering">CLUSTERED BY</a>).</td><td>Hash-based or range-based partitioning via <a href="/docs/27.0.0/ingestion/hadoop#partitionsspec"><code>partitionsSpec</code></a>.</td></tr><tr><td><strong><a href="/docs/27.0.0/ingestion/rollup#perfect-rollup-vs-best-effort-rollup">Rollup modes</a></strong></td><td>Perfect if <code>forceGuaranteedRollup</code> = true in the <a href="/docs/27.0.0/ingestion/native-batch#tuningconfig"><code>tuningConfig</code></a>.</td><td>Always perfect.</td><td>Always perfect.</td></tr></tbody></table></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/design/zookeeper"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">ZooKeeper</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/27.0.0/ingestion/data-formats"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Source input formats</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="#ingestion-methods" class="table-of-contents__link toc-highlight">Ingestion methods</a><ul><li><a href="#streaming" class="table-of-contents__link toc-highlight">Streaming</a></li><li><a href="#batch" class="table-of-contents__link toc-highlight">Batch</a></li></ul></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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