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padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="theme-doc-version-banner alert alert--warning margin-bottom--md" role="alert"><div>This is unreleased documentation for <!-- -->Apache SeaTunnel<!-- --> <b>Next</b> version.</div><div class="margin-top--md">For up-to-date documentation, see the <b><a href="/docs/2.3.5/concept/speed-limit">latest version</a></b> (<!-- -->2.3.5<!-- -->).</div></div><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">Concept</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">Speed Control</span><meta itemprop="position" content="2"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: Next</span><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"><h1>Speed Control</h1><h2 class="anchor anchorWithStickyNavbar_LWe7" id="introduction">Introduction<a href="#introduction" class="hash-link" aria-label="Direct link to Introduction" title="Direct link to Introduction">â</a></h2><p>The SeaTunnel provides a powerful speed control feature that allows you to manage the rate at which data is synchronized. |
| This functionality is essential when you need to ensure efficient and controlled data transfer between systems. |
| The speed control is primarily governed by two key parameters: <code>read_limit.rows_per_second</code> and <code>read_limit.bytes_per_second</code>. |
| This document will guide you through the usage of these parameters and how to leverage them effectively.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="support-those-engines">Support Those Engines<a href="#support-those-engines" class="hash-link" aria-label="Direct link to Support Those Engines" title="Direct link to Support Those Engines">â</a></h2><blockquote><p>SeaTunnel Zeta<br> |
| Flink<br> |
| Spark<br></p></blockquote><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">â</a></h2><p>To use the speed control feature, you need to configure the <code>read_limit.rows_per_second</code> or <code>read_limit.bytes_per_second</code> parameters in your job config.</p><p>Example env config in your config file:</p><div class="language-hocon codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-hocon codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain">env {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> job.mode=STREAMING</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> job.name=SeaTunnel_Job</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> read_limit.bytes_per_second=7000000</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> read_limit.rows_per_second=400</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">source {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MySQL-CDC {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // ignore...</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">}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">transform {</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">sink {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> Console {</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">}</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>We have placed <code>read_limit.bytes_per_second</code> and <code>read_limit.rows_per_second</code> in the <code>env</code> parameters, completing the speed control configuration. |
| You can configure both of these parameters simultaneously or choose to configure only one of them. The value of each <code>value</code> represents the maximum rate at which each thread is restricted. |
| Therefore, when configuring the respective values, please take into account the parallelism of your tasks.</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/apache/incubator-seatunnel-website/edit/main/docs/concept/speed-limit.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_vwxv"></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/concept/sql-config"><div class="pagination-nav__sublabel">Previous</div><div 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