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href="/docs/26.0.0/development/overview">Development</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="/docs/26.0.0/misc/papers-and-talks">Misc</a></div></li></ul></nav></div></div></aside><main class="docMainContainer_gTbr"><div class="container padding-top--md 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">Design</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">Deep 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>Deep storage</h1></header><p>Deep storage is where segments are stored. It is a storage mechanism that Apache Druid does not provide. This deep storage infrastructure defines the level of durability of your data, as long as Druid processes can see this storage infrastructure and get at the segments stored on it, you will not lose data no matter how many Druid nodes you lose. If segments disappear from this storage layer, then you will lose whatever data those segments represented.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="local">Local<a href="#local" class="hash-link" aria-label="Direct link to Local" title="Direct link to Local"></a></h2><p>Local storage is intended for use in the following situations:</p><ul><li>You have just one server.</li><li>Or, you have multiple servers, and they all have access to a shared filesystem (for example: NFS).</li></ul><p>In multi-server production clusters, rather than local storage with a shared filesystem, it is instead recommended to |
| use cloud-based deep storage (<a href="#amazon-s3-or-s3-compatible">Amazon S3</a>, <a href="#google-cloud-storage">Google Cloud Storage</a>, |
| or <a href="#azure-blob-storage">Azure Blob Storage</a>), S3-compatible storage (like Minio), or <a href="#hdfs">HDFS</a>. These options are |
| generally more convenient, more scalable, and more robust than setting up a shared filesystem.</p><p>The following configurations in <code>common.runtime.properties</code> apply to local storage:</p><table><thead><tr><th>Property</th><th>Possible Values</th><th>Description</th><th>Default</th></tr></thead><tbody><tr><td><code>druid.storage.type</code></td><td><code>local</code></td><td></td><td>Must be set.</td></tr><tr><td><code>druid.storage.storageDirectory</code></td><td>any local directory</td><td>Directory for storing segments. Must be different from <code>druid.segmentCache.locations</code> and <code>druid.segmentCache.infoDir</code>.</td><td><code>/tmp/druid/localStorage</code></td></tr><tr><td><code>druid.storage.zip</code></td><td><code>true</code>, <code>false</code></td><td>Whether segments in <code>druid.storage.storageDirectory</code> are written as directories (<code>false</code>) or zip files (<code>true</code>).</td><td><code>false</code></td></tr></tbody></table><p>For example:</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.storage.type=local</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">druid.storage.storageDirectory=/tmp/druid/localStorage</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>The <code>druid.storage.storageDirectory</code> must be set to a different path than <code>druid.segmentCache.locations</code> or |
| <code>druid.segmentCache.infoDir</code>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="amazon-s3-or-s3-compatible">Amazon S3 or S3-compatible<a href="#amazon-s3-or-s3-compatible" class="hash-link" aria-label="Direct link to Amazon S3 or S3-compatible" title="Direct link to Amazon S3 or S3-compatible"></a></h2><p>See <a href="/docs/26.0.0/development/extensions-core/s3"><code>druid-s3-extensions</code></a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="google-cloud-storage">Google Cloud Storage<a href="#google-cloud-storage" class="hash-link" aria-label="Direct link to Google Cloud Storage" title="Direct link to Google Cloud Storage"></a></h2><p>See <a href="/docs/26.0.0/development/extensions-core/google"><code>druid-google-extensions</code></a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="azure-blob-storage">Azure Blob Storage<a href="#azure-blob-storage" class="hash-link" aria-label="Direct link to Azure Blob Storage" title="Direct link to Azure Blob Storage"></a></h2><p>See <a href="/docs/26.0.0/development/extensions-core/azure"><code>druid-azure-extensions</code></a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="hdfs">HDFS<a href="#hdfs" class="hash-link" aria-label="Direct link to HDFS" title="Direct link to HDFS"></a></h2><p>See <a href="/docs/26.0.0/development/extensions-core/hdfs">druid-hdfs-storage extension documentation</a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="additional-options">Additional options<a href="#additional-options" class="hash-link" aria-label="Direct link to Additional options" title="Direct link to Additional options"></a></h2><p>For additional deep storage options, please see our <a href="/docs/26.0.0/development/extensions">extensions list</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/26.0.0/design/processes"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Processes and servers</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/26.0.0/dependencies/metadata-storage"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Metadata storage</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="#local" class="table-of-contents__link toc-highlight">Local</a></li><li><a href="#amazon-s3-or-s3-compatible" class="table-of-contents__link toc-highlight">Amazon S3 or S3-compatible</a></li><li><a href="#google-cloud-storage" class="table-of-contents__link toc-highlight">Google Cloud Storage</a></li><li><a href="#azure-blob-storage" class="table-of-contents__link toc-highlight">Azure Blob Storage</a></li><li><a href="#hdfs" class="table-of-contents__link toc-highlight">HDFS</a></li><li><a href="#additional-options" class="table-of-contents__link toc-highlight">Additional options</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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