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theme-doc-sidebar-item-link-level-2 menu__list-item"><a class=menu__link length=9 tabindex=0 href=/docs/dev/ecosystem/spark-doris-connector/>Spark Doris Connector</a><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class=menu__link length=9 tabindex=0 href=/docs/dev/ecosystem/flink-doris-connector/>Flink Doris Connector</a><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class=menu__link length=9 tabindex=0 href=/docs/dev/ecosystem/doris-kafka-connector/>Doris Kafka Connector</a><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class=menu__list-item-collapsible><a class="menu__link menu__link--sublist menu__link--sublist-caret" role=button aria-expanded=false tabindex=0 href=/docs/dev/ecosystem/doris-operator/doris-operator-overview/>Doris Operator</a></div><li class="theme-doc-sidebar-item-link 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alert--warning margin-bottom--md" role=alert><div>This documentation is for an <b>unreleased</b> version of Apache Doris.</div><div class=margin-top--md>For usage, please refer to the official documentation of <b><a href=/docs/4.x/lakehouse/data-cache/>Version 2.1</a></b> or <b><a href=/docs/3.x/gettingStarted/what-is-apache-doris/>Version 3.x</a></b>.</div></div><div class=docItemContainer_c0TR><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 /></svg></a><li class=breadcrumbs__item><span class=breadcrumbs__link>Guides</span><meta itemprop=position content=1><li class=breadcrumbs__item><span class=breadcrumbs__link>Data Lakehouse</span><meta itemprop=position content=2><li itemscope itemprop=itemListElement itemtype=https://schema.org/ListItem class="breadcrumbs__item breadcrumbs__item--active"><span class=breadcrumbs__link itemprop=name>Data Cache</span><meta itemprop=position content=3></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_bxCs"><button type=button class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Data Cache</h1></header><p>Data Cache accelerates subsequent queries of the same data by caching recently accessed data files from remote storage systems (HDFS or object storage) to local disks. In scenarios where the same data is frequently accessed, Data Cache can avoid the overhead of repeated remote data access, improving the performance and stability of query analysis on hot data.</p> |
| <h2 class="anchor anchorWithStickyNavbar_LWe7" id=applicable-scenarios>Applicable Scenarios<a href=#applicable-scenarios class=hash-link aria-label="Direct link to Applicable Scenarios" title="Direct link to Applicable Scenarios"></a></h2> |
| <p>The data cache function only works for queries on Hive, Iceberg, Hudi, and Paimon tables. It has no effect on internal table queries or non-file external table queries (such as JDBC, Elasticsearch).</p> |
| <p>Whether data caching can improve query efficiency depends on multiple factors. Below are the applicable scenarios for data caching:</p> |
| <ul> |
| <li> |
| <p>High-speed local disk</p> |
| <p>It is recommended to use high-speed local disks, such as SSD or NVME media local disks, as the data cache directory. It is not recommended to use mechanical hard drives as the data cache directory. Essentially, the local disk's IO bandwidth and IOPS must be significantly higher than the network bandwidth and the source storage system's IO bandwidth and IOPS to bring noticeable performance improvements.</p> |
| </li> |
| <li> |
| <p>Sufficient cache space size</p> |
| <p>Data caching uses the LRU strategy as the cache eviction policy. If the queried data does not have a clear distinction between hot and cold, the cached data may be frequently updated and replaced, which may reduce query performance. It is recommended to enable data caching in scenarios where the query pattern has a clear distinction between hot and cold (e.g., most queries only access today's data and rarely access historical data), and the cache space is sufficient to store hot data.</p> |
| </li> |
| <li> |
| <p>Unstable IO latency of remote storage</p> |
| <p>This situation usually occurs on HDFS storage. In most enterprises, different business departments share the same HDFS, which may lead to very unstable IO latency during peak periods. In this case, if you need to ensure stable IO latency, it is recommended to enable data caching. However, the first two conditions should still be considered.</p> |
| </li> |
| </ul> |
| <h2 class="anchor anchorWithStickyNavbar_LWe7" id=enabling-data-cache>Enabling Data Cache<a href=#enabling-data-cache class=hash-link aria-label="Direct link to Enabling Data Cache" title="Direct link to Enabling Data Cache"></a></h2> |
| <p>The data cache function is disabled by default and needs to be enabled by setting relevant parameters in FE and BE.</p> |
| <h3 class="anchor anchorWithStickyNavbar_LWe7" id=be-configuration>BE Configuration<a href=#be-configuration class=hash-link aria-label="Direct link to BE Configuration" title="Direct link to BE Configuration"></a></h3> |
| <p>First, configure the cache path information in <code>be.conf</code> and restart the BE node to make the configuration effective.</p> |
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| <table><thead><tr><th>Parameter<th>Required<th>Description<tbody><tr><td><code>enable_file_cache</code><td>Yes<td>Whether to enable Data Cache, default is false<tr><td><code>file_cache_path</code><td>Yes<td>Configuration related to the cache directory, in JSON format.<tr><td><code>clear_file_cache</code><td>No<td>Default is false. If true, the cache directory will be cleared when the BE node restarts.</table> |
| <p>Example configuration of <code>file_cache_path</code>:</p> |
| <div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#F8F8F2;--prism-background-color:#282A36><div class=codeBlockContent_biex><pre tabindex=0 class="prism-code language-sql codeBlock_bY9V thin-scrollbar" style=color:#F8F8F2;background-color:#282A36><code class=codeBlockLines_e6Vv><span class=token-line style=color:#F8F8F2><span class="token plain">file_cache_path</span><span class="token operator">=</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token plain">{</span><span class="token string" style="color:rgb(255, 121, 198)">"path"</span><span class="token plain">: </span><span class="token string" style="color:rgb(255, 121, 198)">"/path/to/file_cache1"</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">"total_size"</span><span class="token plain">:</span><span class="token number">53687091200</span><span class="token plain">}</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain">{</span><span class="token string" style="color:rgb(255, 121, 198)">"path"</span><span class="token plain">: </span><span class="token string" style="color:rgb(255, 121, 198)">"/path/to/file_cache2"</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">"total_size"</span><span class="token plain">:</span><span class="token number">53687091200</span><span class="token plain">}</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain">{</span><span class="token string" style="color:rgb(255, 121, 198)">"path"</span><span class="token plain">: </span><span class="token string" style="color:rgb(255, 121, 198)">"/path/to/file_cache3"</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">"total_size"</span><span class="token plain">:</span><span class="token number">53687091200</span><span class="token plain">}</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</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"/></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 /></svg></span></button></div></div></div> |
| <p><code>path</code> is the path where the cache is stored, and one or more paths can be configured. It is recommended to configure only one path per disk.</p> |
| <p><code>total_size</code> is the upper limit of the cache space size, in bytes. When the cache space is exceeded, the LRU strategy will be used to evict cached data.</p> |
| <h3 class="anchor anchorWithStickyNavbar_LWe7" id=fe-configuration>FE Configuration<a href=#fe-configuration class=hash-link aria-label="Direct link to FE Configuration" title="Direct link to FE Configuration"></a></h3> |
| <p>Enable Data Cache in a single session:</p> |
| <div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#F8F8F2;--prism-background-color:#282A36><div class=codeBlockContent_biex><pre tabindex=0 class="prism-code language-sql codeBlock_bY9V thin-scrollbar" style=color:#F8F8F2;background-color:#282A36><code class=codeBlockLines_e6Vv><span class=token-line style=color:#F8F8F2><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">SET</span><span class="token plain"> enable_file_cache </span><span class="token operator">=</span><span class="token plain"> </span><span class="token boolean">true</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</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"/></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 /></svg></span></button></div></div></div> |
| <p>Enable Data Cache globally:</p> |
| <div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#F8F8F2;--prism-background-color:#282A36><div class=codeBlockContent_biex><pre tabindex=0 class="prism-code language-sql codeBlock_bY9V thin-scrollbar" style=color:#F8F8F2;background-color:#282A36><code class=codeBlockLines_e6Vv><span class=token-line style=color:#F8F8F2><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">SET</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">GLOBAL</span><span class="token plain"> enable_file_cache </span><span class="token operator">=</span><span class="token plain"> </span><span class="token boolean">true</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</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"/></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 /></svg></span></button></div></div></div> |
| <p>Note that if <code>enable_file_cache</code> is not enabled, the cache will not be used even if the BE is configured with a cache directory. Similarly, if the BE is not configured with a cache directory, the cache will not be used even if <code>enable_file_cache</code> is enabled.</p> |
| <h2 class="anchor anchorWithStickyNavbar_LWe7" id=cache-observability>Cache Observability<a href=#cache-observability class=hash-link aria-label="Direct link to Cache Observability" title="Direct link to Cache Observability"></a></h2> |
| <h3 class="anchor anchorWithStickyNavbar_LWe7" id=view-cache-hit-rate>View Cache Hit Rate<a href=#view-cache-hit-rate class=hash-link aria-label="Direct link to View Cache Hit Rate" title="Direct link to View Cache Hit Rate"></a></h3> |
| <p>Execute <code>set enable_profile=true</code> to open the session variable, and you can view the job's Profile on the <code>Queries</code> tab of the FE web page. The data cache-related metrics are as follows:</p> |
| <div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#F8F8F2;--prism-background-color:#282A36><div class=codeBlockContent_biex><pre tabindex=0 class="prism-code language-sql codeBlock_bY9V thin-scrollbar" style=color:#F8F8F2;background-color:#282A36><code class=codeBlockLines_e6Vv><span class=token-line style=color:#F8F8F2><span class="token operator">-</span><span class="token plain"> FileCache: </span><span class="token number">0</span><span class="token plain">ns</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token operator">-</span><span class="token plain"> BytesScannedFromCache: </span><span class="token number">2.02</span><span class="token plain"> GB</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token operator">-</span><span class="token plain"> BytesScannedFromRemote: </span><span class="token number">0.00</span><span class="token plain"> </span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token operator">-</span><span class="token plain"> BytesWriteIntoCache: </span><span class="token number">0.00</span><span class="token plain"> </span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token operator">-</span><span class="token plain"> LocalIOUseTimer: </span><span class="token number">2</span><span class="token plain">s723ms</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token operator">-</span><span class="token plain"> NumLocalIOTotal: </span><span class="token number">444</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token operator">-</span><span class="token plain"> NumRemoteIOTotal: </span><span class="token number">0</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token operator">-</span><span class="token plain"> NumSkipCacheIOTotal: </span><span class="token number">0</span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token operator">-</span><span class="token plain"> RemoteIOUseTimer: </span><span class="token number">0</span><span class="token plain">ns</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"> </span><span class="token operator">-</span><span class="token plain"> WriteCacheIOUseTimer: </span><span class="token number">0</span><span class="token plain">ns</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"/></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 /></svg></span></button></div></div></div> |
| <ul> |
| <li> |
| <p><code>BytesScannedFromCache</code>: The amount of data read from the local cache.</p> |
| </li> |
| <li> |
| <p><code>BytesScannedFromRemote</code>: The amount of data read from the remote.</p> |
| </li> |
| <li> |
| <p><code>BytesWriteIntoCache</code>: The amount of data written into the cache.</p> |
| </li> |
| <li> |
| <p><code>LocalIOUseTimer</code>: The IO time of the local cache.</p> |
| </li> |
| <li> |
| <p><code>RemoteIOUseTimer</code>: The IO time of remote reading.</p> |
| </li> |
| <li> |
| <p><code>NumLocalIOTotal</code>: The number of IO operations on the local cache.</p> |
| </li> |
| <li> |
| <p><code>NumRemoteIOTotal</code>: The number of remote IO operations.</p> |
| </li> |
| <li> |
| <p><code>WriteCacheIOUseTimer</code>: The IO time of writing into the cache.</p> |
| </li> |
| </ul> |
| <p>If <code>BytesScannedFromRemote</code> is 0, it means the cache is fully hit.</p> |
| <h3 class="anchor anchorWithStickyNavbar_LWe7" id=monitoring-metrics>Monitoring Metrics<a href=#monitoring-metrics class=hash-link aria-label="Direct link to Monitoring Metrics" title="Direct link to Monitoring Metrics"></a></h3> |
| <p>Users can view cache statistics for each Backend node through the system table <a href=/docs/dev/lakehouse/admin-manual/system-tables/information_schema/file_cache_statistics/><code>file_cache_statistics</code></a>.</p> |
| <h2 class="anchor anchorWithStickyNavbar_LWe7" id=cache-warmup>Cache Warmup<a href=#cache-warmup class=hash-link aria-label="Direct link to Cache Warmup" title="Direct link to Cache Warmup"></a></h2> |
| <p>Data Cache provides a cache "warmup" feature that allows preloading external data into the local cache of BE nodes, thereby improving cache hit rates and query performance for subsequent first-time queries.</p> |
| <blockquote> |
| <p>This feature is supported since version 4.0.2.</p> |
| </blockquote> |
| <h3 class="anchor anchorWithStickyNavbar_LWe7" id=syntax>Syntax<a href=#syntax class=hash-link aria-label="Direct link to Syntax" title="Direct link to Syntax"></a></h3> |
| <div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#F8F8F2;--prism-background-color:#282A36><div class=codeBlockContent_biex><pre tabindex=0 class="prism-code language-sql codeBlock_bY9V thin-scrollbar" style=color:#F8F8F2;background-color:#282A36><code class=codeBlockLines_e6Vv><span class=token-line style=color:#F8F8F2><span class="token plain">WARM UP </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">SELECT</span><span class="token plain"> </span><span class="token operator"><</span><span class="token plain">select_expr_list</span><span class="token operator">></span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">FROM</span><span class="token plain"> </span><span class="token operator"><</span><span class="token plain">table_reference</span><span class="token operator">></span><span class="token plain"></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">WHERE</span><span class="token plain"> </span><span class="token operator"><</span><span class="token plain">boolean_expression</span><span class="token operator">></span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</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"/></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 /></svg></span></button></div></div></div> |
| <p>Usage restrictions:</p> |
| <ul> |
| <li> |
| <p>Supported:</p> |
| <ul> |
| <li>Single table queries (only one table_reference allowed)</li> |
| <li>Simple SELECT for specified columns</li> |
| <li>WHERE filtering (supports regular predicates)</li> |
| </ul> |
| </li> |
| <li> |
| <p>Not supported:</p> |
| <ul> |
| <li>JOIN, UNION, subqueries, CTE</li> |
| <li>GROUP BY, HAVING, ORDER BY</li> |
| <li>LIMIT</li> |
| <li>INTO OUTFILE</li> |
| <li>Multi-table / complex query plans</li> |
| <li>Other complex syntax</li> |
| </ul> |
| </li> |
| </ul> |
| <h3 class="anchor anchorWithStickyNavbar_LWe7" id=examples>Examples<a href=#examples class=hash-link aria-label="Direct link to Examples" title="Direct link to Examples"></a></h3> |
| <ol> |
| <li>Warm up the entire table</li> |
| </ol> |
| <div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#F8F8F2;--prism-background-color:#282A36><div class=codeBlockContent_biex><pre tabindex=0 class="prism-code language-sql codeBlock_bY9V thin-scrollbar" style=color:#F8F8F2;background-color:#282A36><code class=codeBlockLines_e6Vv><span class=token-line style=color:#F8F8F2><span class="token plain">WARM UP </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">SELECT</span><span class="token plain"> </span><span class="token operator">*</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">FROM</span><span class="token plain"> hive_db</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">tpch100_parquet</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">lineitem</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</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"/></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 /></svg></span></button></div></div></div> |
| <ol start=2> |
| <li>Warm up partial columns by partition</li> |
| </ol> |
| <div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#F8F8F2;--prism-background-color:#282A36><div class=codeBlockContent_biex><pre tabindex=0 class="prism-code language-sql codeBlock_bY9V thin-scrollbar" style=color:#F8F8F2;background-color:#282A36><code class=codeBlockLines_e6Vv><span class=token-line style=color:#F8F8F2><span class="token plain">WARM UP </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">SELECT</span><span class="token plain"> l_orderkey</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> l_shipmode</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">FROM</span><span class="token plain"> hive_db</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">tpch100_parquet</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">lineitem</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">WHERE</span><span class="token plain"> dt </span><span class="token operator">=</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">'2025-01-01'</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</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"/></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 /></svg></span></button></div></div></div> |
| <ol start=3> |
| <li>Warm up partial columns by filter conditions</li> |
| </ol> |
| <div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#F8F8F2;--prism-background-color:#282A36><div class=codeBlockContent_biex><pre tabindex=0 class="prism-code language-sql codeBlock_bY9V thin-scrollbar" style=color:#F8F8F2;background-color:#282A36><code class=codeBlockLines_e6Vv><span class=token-line style=color:#F8F8F2><span class="token plain">WARM UP </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">SELECT</span><span class="token plain"> l_shipmode</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> l_linestatus</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">FROM</span><span class="token plain"> hive_db</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">tpch100_parquet</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">lineitem</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">WHERE</span><span class="token plain"> l_orderkey </span><span class="token operator">=</span><span class="token plain"> </span><span class="token number">123456</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</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"/></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 /></svg></span></button></div></div></div> |
| <h3 class="anchor anchorWithStickyNavbar_LWe7" id=execution-results>Execution Results<a href=#execution-results class=hash-link aria-label="Direct link to Execution Results" title="Direct link to Execution Results"></a></h3> |
| <p>After executing <code>WARM UP SELECT</code>, the FE dispatches tasks to each BE. The BE scans remote data and writes it to Data Cache.</p> |
| <p>The system directly returns scan and cache write statistics for each BE (Note: Statistics are generally accurate but may have some margin of error). For example:</p> |
| <div class="codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#F8F8F2;--prism-background-color:#282A36><div class=codeBlockContent_biex><pre tabindex=0 class="prism-code language-text codeBlock_bY9V thin-scrollbar" style=color:#F8F8F2;background-color:#282A36><code class=codeBlockLines_e6Vv><span class=token-line style=color:#F8F8F2><span class="token plain">+---------------+-----------+-------------+---------------------------+----------------------------+---------------------+</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain">| BackendId | ScanRows | ScanBytes | ScanBytesFromLocalStorage | ScanBytesFromRemoteStorage | BytesWriteIntoCache |</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain">+---------------+-----------+-------------+---------------------------+----------------------------+---------------------+</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain">| 1755134092928 | 294744184 | 11821864798 | 538154009 | 11283717130 | 11899799492 |</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain">| 1755134092929 | 305293718 | 12244439301 | 560970435 | 11683475207 | 12332861380 |</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain">| TOTAL | 600037902 | 24066304099 | 1099124444 | 22967192337 | 24232660872 |</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain">+---------------+-----------+-------------+---------------------------+----------------------------+---------------------+</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"/></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 /></svg></span></button></div></div></div> |
| <p>Field explanations:</p> |
| <ul> |
| <li>ScanRows: Number of rows scanned and read.</li> |
| <li>ScanBytes: Amount of data scanned and read.</li> |
| <li>ScanBytesFromLocalStorage: Amount of data scanned and read from local cache.</li> |
| <li>ScanBytesFromRemoteStorage: Amount of data scanned and read from remote storage.</li> |
| <li>BytesWriteIntoCache: Amount of data written to Data Cache during this warmup.</li> |
| </ul> |
| <h2 class="anchor anchorWithStickyNavbar_LWe7" id=appendix>Appendix<a href=#appendix class=hash-link aria-label="Direct link to Appendix" title="Direct link to Appendix"></a></h2> |
| <h3 class="anchor anchorWithStickyNavbar_LWe7" id=principle>Principle<a href=#principle class=hash-link aria-label="Direct link to Principle" title="Direct link to Principle"></a></h3> |
| <p>Data caching caches accessed remote data to the local BE node. The original data file is split into Blocks based on the accessed IO size, and Blocks are stored in the local file <code>cache_path/hash(filepath).substr(0, 3)/hash(filepath)/offset</code>, with Block metadata saved in the BE node. When accessing the same remote file, doris checks whether the cache data of the file exists in the local cache and determines which data to read from the local Block and which data to pull from the remote based on the Block's offset and size, caching the newly pulled remote data. When the BE node restarts, it scans the <code>cache_path</code> directory to restore Block metadata. 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