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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">Design</span><meta itemprop="position" content="1"></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Services</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">Historical</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>Historical service</h1></header><p>The Historical service is responsible for storing and querying historical data. |
| Historical services cache data segments on local disk and serve queries from that cache as well as from an in-memory cache.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="configuration">Configuration<a href="#configuration" class="hash-link" aria-label="Direct link to Configuration" title="Direct link to Configuration"></a></h2><p>For Apache Druid Historical service configuration, see <a href="/docs/latest/configuration/#historical">Historical configuration</a>.</p><p>For basic tuning guidance for the Historical service, see <a href="/docs/latest/operations/basic-cluster-tuning#historical">Basic cluster tuning</a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="http-endpoints">HTTP endpoints<a href="#http-endpoints" class="hash-link" aria-label="Direct link to HTTP endpoints" title="Direct link to HTTP endpoints"></a></h2><p>For a list of API endpoints supported by the Historical, please see the <a href="/docs/latest/api-reference/service-status-api#historical">Service status API reference</a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="running">Running<a href="#running" class="hash-link" aria-label="Direct link to Running" title="Direct link to Running"></a></h2><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">org.apache.druid.cli.Main server historical</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="loading-and-serving-segments">Loading and serving segments<a href="#loading-and-serving-segments" class="hash-link" aria-label="Direct link to Loading and serving segments" title="Direct link to Loading and serving segments"></a></h2><p>Each Historical service copies or pulls segment files from deep storage to local disk in an area called the segment cache. To configure the size and location of the segment cache on each Historical service, set the <code>druid.segmentCache.locations</code>. |
| For more information, see <a href="/docs/latest/operations/basic-cluster-tuning#segment-cache-size">Segment cache size</a>.</p><p>The <a href="/docs/latest/design/coordinator">Coordinator</a> controls the assignment of segments to Historicals and the balance of segments between Historicals. Historical services do not communicate directly with each other, nor do they communicate directly with the Coordinator. Instead, the Coordinator creates ephemeral entries in ZooKeeper in a <a href="/docs/latest/configuration/#path-configuration">load queue path</a>. Each Historical service maintains a connection to ZooKeeper, watching those paths for segment information.</p><p>When a Historical service detects a new entry in the ZooKeeper load queue, it checks its own segment cache. If no information about the segment exists there, the Historical service first retrieves metadata from ZooKeeper about the segment, including where the segment is located in deep storage and how it needs to decompress and process it.</p><p>For more information about segment metadata and Druid segments in general, see <a href="/docs/latest/design/segments">Segments</a>.</p><p>After a Historical service pulls down and processes a segment from deep storage, Druid advertises the segment as being available for queries from the Broker. This announcement by the Historical is made via ZooKeeper, in a <a href="/docs/latest/configuration/#path-configuration">served segments path</a>.</p><p>For more information about how the Broker determines what data is available for queries, see <a href="/docs/latest/design/broker">Broker</a>.</p><p>To make data from the segment cache available for querying as soon as possible, Historical services search the local segment cache upon startup and advertise the segments found there.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="loading-and-serving-segments-from-cache">Loading and serving segments from cache<a href="#loading-and-serving-segments-from-cache" class="hash-link" aria-label="Direct link to Loading and serving segments from cache" title="Direct link to Loading and serving segments from cache"></a></h2><p>The segment cache uses <a href="https://en.wikipedia.org/wiki/Mmap" target="_blank" rel="noopener noreferrer">memory mapping</a>. The cache consumes memory from the underlying operating system so Historicals can hold parts of segment files in memory to increase query performance at the data level. The in-memory segment cache is affected by the size of the Historical JVM, heap / direct memory buffers, and other services on the operating system itself.</p><p>At query time, if the required part of a segment file is available in the memory mapped cache or "page cache", the Historical re-uses it and reads it directly from memory. If it is not in the memory-mapped cache, the Historical reads that part of the segment from disk. In this case, there is potential for new data to flush other segment data from memory. This means that if free operating system memory is close to <code>druid.server.maxSize</code>, the more likely that segment data will be available in memory and reduce query times. Conversely, the lower the free operating system memory, the more likely a Historical is to read segments from disk.</p><p>Note that this memory-mapped segment cache is in addition to other <a href="/docs/latest/querying/caching">query-level caches</a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="querying-segments">Querying segments<a href="#querying-segments" class="hash-link" aria-label="Direct link to Querying segments" title="Direct link to Querying segments"></a></h2><p>You can configure a Historical service to log and report metrics for every query it services. |
| For information on querying Historical services, see <a href="/docs/latest/querying/">Querying</a>.</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/latest/design/router"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Router</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/latest/design/middlemanager"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">MiddleManager</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="#configuration" class="table-of-contents__link toc-highlight">Configuration</a></li><li><a href="#http-endpoints" class="table-of-contents__link toc-highlight">HTTP endpoints</a></li><li><a href="#running" class="table-of-contents__link toc-highlight">Running</a></li><li><a href="#loading-and-serving-segments" class="table-of-contents__link toc-highlight">Loading and serving segments</a></li><li><a href="#loading-and-serving-segments-from-cache" class="table-of-contents__link toc-highlight">Loading and serving segments from cache</a></li><li><a href="#querying-segments" class="table-of-contents__link toc-highlight">Querying segments</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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