| <!doctype html> |
| <html lang="en" dir="ltr" class="docs-wrapper docs-doc-page docs-version-current plugin-docs plugin-id-default docs-doc-id-txn-advanced-features"> |
| <head> |
| <meta charset="UTF-8"> |
| <meta name="generator" content="Docusaurus v2.4.0"> |
| <title data-rh="true">Advanced features | Apache Pulsar</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:image" content="https://pulsar.apache.org/img/pulsar-social-media-card.png"><meta data-rh="true" name="twitter:image" content="https://pulsar.apache.org/img/pulsar-social-media-card.png"><meta data-rh="true" property="og:url" content="https://pulsar.apache.org/docs/next/txn-advanced-features/"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-default-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-current"><meta data-rh="true" property="og:title" content="Advanced features | Apache Pulsar"><meta data-rh="true" name="description" content="Get a comprehensive understanding of advanced features of transactions in Pulsar."><meta data-rh="true" property="og:description" content="Get a comprehensive understanding of advanced features of transactions in Pulsar."><link data-rh="true" rel="icon" href="/img/favicon.ico"><link data-rh="true" rel="alternate" href="https://pulsar.apache.org/docs/next/txn-advanced-features/" hreflang="en"><link data-rh="true" rel="alternate" href="https://pulsar.apache.org/docs/next/txn-advanced-features/" hreflang="x-default"><link data-rh="true" rel="canonical" href="https://pulsar.apache.org/docs/next/txn-advanced-features/"><link data-rh="true" rel="preconnect" href="https://WK2YL0SALL-dsn.algolia.net" crossorigin="anonymous"><link rel="alternate" type="application/rss+xml" href="/blog/rss.xml" title="Apache Pulsar RSS Feed"> |
| <link rel="alternate" type="application/atom+xml" href="/blog/atom.xml" title="Apache Pulsar Atom Feed"> |
| |
| |
| |
| <link rel="search" type="application/opensearchdescription+xml" title="Apache Pulsar" href="/opensearch.xml"> |
| |
| |
| |
| |
| |
| <link rel="stylesheet" href="/css/katex-0.13.24.min.css" media="print" onload="this.media='all'"> |
| <script src="/js/sine-waves.min.js" async></script> |
| <script src="/js/matomo-agent.js"></script><link rel="stylesheet" href="/assets/css/styles.b0f65ef3.css"> |
| <link rel="preload" href="/assets/js/runtime~main.1d0ed2a7.js" as="script"> |
| <link rel="preload" href="/assets/js/main.e07a0c68.js" as="script"> |
| </head> |
| <body class="navigation-with-keyboard"> |
| <script>!function(){function t(t){document.documentElement.setAttribute("data-theme",t)}var e=function(){var t=null;try{t=new URLSearchParams(window.location.search).get("docusaurus-theme")}catch(t){}return t}()||function(){var t=null;try{t=localStorage.getItem("theme")}catch(t){}return t}();t(null!==e?e:"light")}(),document.documentElement.setAttribute("data-announcement-bar-initially-dismissed",function(){try{return"true"===localStorage.getItem("docusaurus.announcement.dismiss")}catch(t){}return!1}())</script><div id="__docusaurus"> |
| <div role="region" aria-label="Skip to main content"><a class="skipToContent_fXgn" href="#docusaurus_skipToContent_fallback">Skip to main content</a></div><div class="announcementBar_mb4j" style="background-color:#282826;color:#fff" role="banner"><div class="content_knG7 announcementBarContent_xLdY"> |
| <a class="announcement-bar" href="https://registration.socio.events/e/pulsarvirtualsummiteurope2024" target="_blank"> |
| <div class="announcement-bar__content"> |
| <svg class="announcement-bar__icon"> |
| |
| <svg viewBox="0 0 33 32" fill="none" xmlns="http://www.w3.org/2000/svg"> |
| <path d="M6.5 19.6001H16.1L15.3 29.2001L26.5 12.4H17.06L18.1 2.80005L6.5 19.6001Z" stroke="#F7F7F7" stroke-width="1.5" stroke-linejoin="round"/> |
| </svg> |
| |
| </svg> |
| |
| <span> |
| Get your free pass for Pulsar Virtual Summit Europe 2024 on May 14, 2024 🗓️ |
| </span> |
| |
| <svg class="announcement-bar__icon"> |
| |
| <svg viewBox="0 0 32 32" fill="none" xmlns="http://www.w3.org/2000/svg"> |
| <rect width="20" height="20" transform="translate(6 6)" fill="white" fill-opacity="0.01"/> |
| <path d="M17.6667 10.1667L23.5 16.0001M23.5 16.0001L17.6667 21.8334M23.5 16.0001L8.5 16.0001" stroke="white" stroke-linecap="round" stroke-linejoin="round"/> |
| <rect x="0.5" y="0.5" width="31" height="31" rx="15.5" stroke="white"/> |
| </svg> |
| |
| </svg> |
| </div> |
| </a> |
| </div></div><nav aria-label="Main" class="navbar navbar--fixed-top"><div class="navbar__inner"><div class="navbar__items"><button aria-label="Toggle navigation bar" aria-expanded="false" class="navbar__toggle clean-btn" type="button"><svg width="30" height="30" viewBox="0 0 30 30" aria-hidden="true"><path stroke="currentColor" stroke-linecap="round" stroke-miterlimit="10" stroke-width="2" d="M4 7h22M4 15h22M4 23h22"></path></svg></button><a class="navbar__brand" href="/"><div class="navbar__logo"><img src="/img/logo-black.svg" alt="Apache Pulsar logo" class="themedImage_ToTc themedImage--light_HNdA" height="25" width="127"><img src="/img/logo-black.svg" alt="Apache Pulsar logo" class="themedImage_ToTc themedImage--dark_i4oU" height="25" width="127"></div><b class="navbar__title text--truncate"></b></a><div class="navbar__item dropdown dropdown--hoverable"><a href="#" aria-haspopup="true" aria-expanded="false" role="button" class="navbar__link">Get Started</a><ul class="dropdown__menu"><li><a class="dropdown__link" href="/docs/3.2.x/concepts-overview/">Concepts</a></li><li><a class="dropdown__link" href="/docs/3.2.x/">Quickstart</a></li><li><a class="dropdown__link" href="/ecosystem/">Ecosystem</a></li></ul></div><a aria-current="page" class="navbar__item navbar__link navbar__link--active" href="/docs/next/">Docs</a><a class="navbar__item navbar__link" href="/features/">Features</a><a class="navbar__item navbar__link" href="/use-cases/">Use Cases</a><div class="navbar__item dropdown dropdown--hoverable"><a href="#" aria-haspopup="true" aria-expanded="false" role="button" class="navbar__link community-dropdown">Community</a><ul class="dropdown__menu"><li><a class="dropdown__link scroll-link scroll-welcome" id="scroll-welcome" href="/community/">Welcome</a></li><li><a class="dropdown__link scroll-link scroll-discussions" id="scroll-discussions" href="/community/#section-discussions">Discussions</a></li><li><a class="dropdown__link scroll-link" id="scroll-governance" href="/community/#section-governance">Governance</a></li><li><a class="dropdown__link scroll-link" id="scroll-community" href="/community/#section-community">Meet the Community</a></li><li><a class="dropdown__link scroll-link" id="scroll-contribute" href="/community/#section-contribute">Contribute</a></li><li><a class="dropdown__link" href="/contribute/">Contribution Guide</a></li><li><a href="https://github.com/apache/pulsar/wiki" target="_blank" rel="noopener noreferrer" class="dropdown__link">Wiki</a></li><li><a href="https://github.com/apache/pulsar/issues" target="_blank" rel="noopener noreferrer" class="dropdown__link">Issue Tracking</a></li></ul></div><div class="navbar__item dropdown dropdown--hoverable"><a href="#" aria-haspopup="true" aria-expanded="false" role="button" class="navbar__link">Learn</a><ul class="dropdown__menu"><li><a class="dropdown__link" href="/blog/">Blog</a></li><li><a class="dropdown__link" href="/books/">Books</a></li><li><a class="dropdown__link" href="/case-studies/">Case Studies</a></li><li><a class="dropdown__link" href="/articles/">Articles</a></li><li><a class="dropdown__link" href="/presentations/">Presentations</a></li><li><a class="dropdown__link" href="/events/">Events</a></li></ul></div></div><div class="navbar__items navbar__items--right"><a class="navbar__item navbar__link navbar_download_button" href="/download/">Download</a><div class="searchBox_ZlJk"><button type="button" class="DocSearch DocSearch-Button" aria-label="Search"><span class="DocSearch-Button-Container"><svg width="20" height="20" class="DocSearch-Search-Icon" viewBox="0 0 20 20" aria-hidden="true"><path d="M14.386 14.386l4.0877 4.0877-4.0877-4.0877c-2.9418 2.9419-7.7115 2.9419-10.6533 0-2.9419-2.9418-2.9419-7.7115 0-10.6533 2.9418-2.9419 7.7115-2.9419 10.6533 0 2.9419 2.9418 2.9419 7.7115 0 10.6533z" stroke="currentColor" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round"></path></svg><span class="DocSearch-Button-Placeholder">Search</span></span><span class="DocSearch-Button-Keys"></span></button></div></div></div><div role="presentation" class="navbar-sidebar__backdrop"></div></nav><div id="docusaurus_skipToContent_fallback" class="main-wrapper mainWrapper_z2l0 docsWrapper_BCFX"><button aria-label="Scroll back to top" class="clean-btn theme-back-to-top-button backToTopButton_sjWU" type="button"></button><div class="docPage__5DB"><aside class="theme-doc-sidebar-container docSidebarContainer_b6E3"><div class="sidebarViewport_Xe31"><div class="sidebar_mhZE"><div class="sidebarVersionSwitch_EHpo">Version:<div class="navbar__item dropdown dropdown--hoverable"><a aria-current="page" class="navbar__link active" aria-haspopup="true" aria-expanded="false" role="button" href="/docs/next/">Next</a><ul class="dropdown__menu"><li><a class="dropdown__link">Next</a></li><li><a class="dropdown__link">3.2.x</a></li><li><a class="dropdown__link">3.0.x LTS</a></li><li><a class="dropdown__link">Others</a></li></ul></div></div><nav aria-label="Docs sidebar" class="menu thin-scrollbar menu_SIkG menuWithAnnouncementBar_GW3s"><ul class="theme-doc-sidebar-menu menu__list"><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/docs/next/">About</a></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" aria-expanded="false" href="/docs/next/getting-started-home/">Get Started</a><button aria-label="Toggle the collapsible sidebar category 'Get Started'" type="button" class="clean-btn menu__caret"></button></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/next/concepts-overview/">Concepts and Architecture</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/next/schema-overview/">Pulsar Schema</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/next/functions-overview/">Pulsar Functions</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/next/io-overview/">Pulsar IO</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/next/sql-overview/">Pulsar SQL</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/next/tiered-storage-overview/">Tiered Storage</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret menu__link--active" aria-expanded="true" href="/docs/next/txn-why/">Transactions</a></div><ul style="display:block;overflow:visible;height:auto" class="menu__list"><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/docs/next/txn-why/">Why transactions?</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/docs/next/txn-what/">Concept</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/docs/next/txn-use/">Get started</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link menu__link--active" aria-current="page" tabindex="0" href="/docs/next/txn-advanced-features/">Advanced features</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/docs/next/txn-monitor/">Monitoring</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/docs/next/txn-how/">Working principles</a></li></ul></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" aria-expanded="false" href="/docs/next/install-deploy-upgrade-landing/">Deployment</a><button aria-label="Toggle the collapsible sidebar category 'Deployment'" type="button" class="clean-btn menu__caret"></button></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/next/administration-zk-bk/">Administration</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/next/administration-stats/">Observability</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/next/security-overview/">Security</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/next/performance-pulsar-perf/">Performance</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/next/client-libraries/">Client Libraries</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/next/admin-api-overview/">Admin API</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/next/adaptors-kafka/">Adaptors</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" aria-expanded="false" href="/docs/next/how-to-landing/">Tutorials</a><button aria-label="Toggle the collapsible sidebar category 'Tutorials'" type="button" class="clean-btn menu__caret"></button></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" aria-expanded="false" href="/docs/next/developers-landing/">Development</a><button aria-label="Toggle the collapsible sidebar category 'Development'" type="button" class="clean-btn menu__caret"></button></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" aria-expanded="false" href="/docs/next/reference-landing/">Reference</a><button aria-label="Toggle the collapsible sidebar category 'Reference'" type="button" class="clean-btn menu__caret"></button></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">Transactions</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">Advanced features</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"><header><h1>Advanced features</h1></header><p>You can use the following advanced features with transactions in Pulsar.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="ack-batch-messages">Ack batch messages<a href="#ack-batch-messages" class="hash-link" aria-label="Direct link to Ack batch messages" title="Direct link to Ack batch messages"></a></h2><p>If you want to acknowledge batch messages with transactions, set <code>acknowledgmentAtBatchIndexLevelEnabled</code> to <code>true</code> in the <a href="https://github.com/apache/pulsar/blob/master/conf/broker.conf" target="_blank" rel="noopener noreferrer"><code>broker.conf</code></a> or <a href="https://github.com/apache/pulsar/blob/master/conf/standalone.conf" target="_blank" rel="noopener noreferrer"><code>standalone.conf</code></a> file.</p><div class="language-conf codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-conf codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain">acknowledgmentAtBatchIndexLevelEnabled=true</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 class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path 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 class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>This example enables batch messages ack in transactions in the consumer builder.</p><div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token class-name">Consumer</span><span class="token operator"><</span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">byte</span><span class="token punctuation" style="color:rgb(248, 248, 242)">[</span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</span><span class="token operator">></span><span class="token plain"> consumer </span><span class="token operator">=</span><span class="token plain"> pulsarClient</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 function" style="color:rgb(80, 250, 123)">newConsumer</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</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 function" style="color:rgb(80, 250, 123)">topic</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">transferTopic</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</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 function" style="color:rgb(80, 250, 123)">subscriptionName</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token string" style="color:rgb(255, 121, 198)">"transaction-sub"</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</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 function" style="color:rgb(80, 250, 123)">subscriptionInitialPosition</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token class-name">SubscriptionInitialPosition</span><span class="token class-name punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token class-name">Earliest</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</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 function" style="color:rgb(80, 250, 123)">subscriptionType</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token class-name">SubscriptionType</span><span class="token class-name punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token class-name">Shared</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</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 function" style="color:rgb(80, 250, 123)">enableBatchIndexAcknowledgment</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token boolean">true</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token comment" style="color:rgb(98, 114, 164)">// enable batch index acknowledgment</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 function" style="color:rgb(80, 250, 123)">subscribe</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</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 class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path 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 class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path 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="enable-authentication">Enable authentication<a href="#enable-authentication" class="hash-link" aria-label="Direct link to Enable authentication" title="Direct link to Enable authentication"></a></h2><p>If you want to enable authentication with transactions, follow the steps below.</p><ol><li><p><a href="/docs/next/admin-api-topics/#grant-permission">Grant "consume" permission</a> to the <code>persistent://pulsar/system/transaction_coordinator_assign</code> topic.</p></li><li><p><a href="/docs/next/txn-advanced-features/security-overview/#authentication">Configure authentication</a> in a Pulsar client.</p></li></ol><h2 class="anchor anchorWithStickyNavbar_LWe7" id="select-transaction-isolation-level">Select transaction isolation level<a href="#select-transaction-isolation-level" class="hash-link" aria-label="Direct link to Select transaction isolation level" title="Direct link to Select transaction isolation level"></a></h2><p>To enhance the flexibility of Pulsar transactions, they support two distinct isolation levels:</p><ul><li><code>READ_COMMITTED</code>(default): The consumer can only consume all transactional messages that have been committed.</li><li><code>READ_UNCOMMITTED</code>: The consumer can consume all messages, even transactional messages that have been aborted.</li></ul><p>For different scenarios, they use different subscriptions and choose different isolation levels. One scenario might require transactions, while another might not. In general, not all subscriptions of the same topic require transaction guarantees. Some want low latency without the exact-once semantic guarantee (like a real-time monitoring system), and some must require the exactly-once guarantee (e.g., business processing systems). |
| Users can freely choose different isolation levels according to different scenarios.</p><p>Note that this is a subscription-level configuration, and all consumers under the same subscription must be configured with the same isolation level.</p><p>In this example, the consumer builder uses the <code>READ_UNCOMMITTED</code> isolation level.</p><div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token class-name">Consumer</span><span class="token generics punctuation" style="color:rgb(248, 248, 242)"><</span><span class="token generics class-name">String</span><span class="token generics punctuation" style="color:rgb(248, 248, 242)">></span><span class="token plain"> consumer </span><span class="token operator">=</span><span class="token plain"> client</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 function" style="color:rgb(80, 250, 123)">newConsumer</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token class-name">Schema</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token constant" style="color:rgb(189, 147, 249)">STRING</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</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 function" style="color:rgb(80, 250, 123)">topic</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token string" style="color:rgb(255, 121, 198)">"persistent://my-tenant/my-namespace/my-topic"</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</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 function" style="color:rgb(80, 250, 123)">subscriptionName</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token string" style="color:rgb(255, 121, 198)">"my-subscription"</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</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 function" style="color:rgb(80, 250, 123)">subscriptionType</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token class-name">SubscriptionType</span><span class="token class-name punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token class-name">Shared</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</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 function" style="color:rgb(80, 250, 123)">subscriptionIsolationLevel</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token class-name">SubscriptionIsolationLevel</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token constant" style="color:rgb(189, 147, 249)">READ_UNCOMMITTED</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token comment" style="color:rgb(98, 114, 164)">// Adding the isolation level configuration</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 function" style="color:rgb(80, 250, 123)">subscribe</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</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 class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path 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 class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path 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="guarantee-exactly-once-semantics">Guarantee exactly-once semantics<a href="#guarantee-exactly-once-semantics" class="hash-link" aria-label="Direct link to Guarantee exactly-once semantics" title="Direct link to Guarantee exactly-once semantics"></a></h2><p>If you want to guarantee exactly-once semantics with transactions, you can <a href="/docs/next/cookbooks-deduplication/#enable-message-deduplication-at-namespace-or-topic-level">enable message deduplication at the broker, namespace, or topic level</a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="related-topics">Related topics<a href="#related-topics" class="hash-link" aria-label="Direct link to Related topics" title="Direct link to Related topics"></a></h2><ul><li>To get up quickly, see <a href="/docs/next/txn-use/">Pulsar transactions - Get started</a>.</li></ul></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/pulsar-site/edit/main/docs/txn-advanced-features.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 navigation"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/next/txn-use/"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Get started</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/next/txn-monitor/"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Monitoring</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_jeP5 thin-scrollbar theme-doc-toc-desktop"><div class="border"><div style="color:var(--ifm-toc-link-color)">Was this helpful?</div><div style="border-width:1px;padding:3px;display:flex"><div style="justify-content:center;display:flex;border-radius:99999px;width:2.5rem;height:2.5rem;cursor:pointer;background:;color:"><svg style="width:initial;height:initial" width="12" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg"><path fill-rule="evenodd" clip-rule="evenodd" d="M10.086 1.594A1 1 0 0 1 11 1a4 4 0 0 1 4 4v3h4.655a3 3 0 0 1 2.994 3.45l-1.38 9A3.002 3.002 0 0 1 18.275 23H4a3 3 0 0 1-3-3v-7a3 3 0 0 1 3-3h2.35l3.736-8.406ZM8 11.212l3.608-8.117A2 2 0 0 1 13 5v4a1 1 0 0 0 1 1h5.671a1 1 0 0 1 1 1.15l-1.38 9a1 1 0 0 1-1 .85H8v-9.788ZM6 21v-9H4a1 1 0 0 0-1 1v7a1 1 0 0 0 1 1h2Z" fill="currentColor"></path></svg></div><div style="justify-content:center;display:flex;border-radius:99999px;width:2.5rem;height:2.5rem;cursor:pointer;background:;color:"><svg style="width:initial;height:initial" width="12" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg"><path fill-rule="evenodd" clip-rule="evenodd" d="M20.563 3.316A1.31 1.31 0 0 0 19.687 3h-1.688v9h1.688a1.31 1.31 0 0 0 1.312-1.077V4.077a1.31 1.31 0 0 0-.436-.761ZM16 12.788l-3.608 8.117A1.999 1.999 0 0 1 11 19v-4a1 1 0 0 0-1-1H4.328a1.002 1.002 0 0 1-1-1.15l1.38-9a1 1 0 0 1 1-.85h10.291v9.788ZM19.661 1a3.31 3.31 0 0 1 3.329 2.866c.006.044.01.09.01.134v7c0 .045-.004.09-.01.134A3.31 3.31 0 0 1 19.661 14h-2.012l-3.736 8.406a1 1 0 0 1-.914.594 4 4 0 0 1-4-4v-3H4.344a3 3 0 0 1-2.994-3.45l1.38-9A3.002 3.002 0 0 1 5.724 1h13.937Z" fill="currentColor"></path></svg></div></div><div class="Actions_uugI"><a target="_blank" class="Action_iBHd" href="https://github.com/apache/pulsar/issues/new?assignees=&labels=doc-required&projects=&template=doc.yml&title=%5BDoc%5D+">💡 Suggest changes</a><a target="_blank" class="Action_iBHd" href="https://github.com/apache/pulsar/discussions/new?category=q-a">🛟 Get support</a></div></div><ul class="table-of-contents table-of-contents__left-border"><li><a href="#ack-batch-messages" class="table-of-contents__link toc-highlight">Ack batch messages</a></li><li><a href="#enable-authentication" class="table-of-contents__link toc-highlight">Enable authentication</a></li><li><a href="#select-transaction-isolation-level" class="table-of-contents__link toc-highlight">Select transaction isolation level</a></li><li><a href="#guarantee-exactly-once-semantics" class="table-of-contents__link toc-highlight">Guarantee exactly-once semantics</a></li><li><a href="#related-topics" class="table-of-contents__link toc-highlight">Related topics</a></li></ul></div></div></div></div></main></div></div><footer class="footer"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title"></div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://www.apache.org/" target="_blank" rel="noopener noreferrer" class="footer__link-item">Foundation<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a href="https://www.apache.org/events/current-event.html" target="_blank" rel="noopener noreferrer" class="footer__link-item">Events<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li></ul></div><div class="col footer__col"><div class="footer__title"></div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://www.apache.org/licenses/" target="_blank" rel="noopener noreferrer" class="footer__link-item">License<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a href="https://www.apache.org/foundation/thanks" target="_blank" rel="noopener noreferrer" class="footer__link-item">Thanks<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a href="https://www.apache.org/foundation/sponsorship" target="_blank" rel="noopener noreferrer" class="footer__link-item">Sponsorship<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li></ul></div><div class="col footer__col"><div class="footer__title"></div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/security/">Security</a></li><li class="footer__item"><a href="https://www.apache.org/foundation/policies/privacy.html" target="_blank" rel="noopener noreferrer" class="footer__link-item">Privacy<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a class="footer__link-item" href="/contact/">Contact</a></li></ul></div><div class="col footer__col"><div class="footer__title"></div><ul class="footer__items clean-list"><li class="footer__item"> |
| <div class="social-icons"> |
| <a target="_blank" href="https://communityinviter.com/apps/apache-pulsar/apache-pulsar" aria-label="Join the Apache Pulsar Slack workspace"> |
| <img alt="Slack logo" src="/img/slack-white.svg" width="26"> |
| </a> |
| <a target="_blank" href="https://github.com/apache/pulsar/" aria-label="View the Apache Pulsar project on GitHub"> |
| <img alt="GitHub logo" src="/img/github-white.svg" width="26"> |
| </a> |
| </div> |
| </li></ul></div></div><div class="footer__bottom text--center"><div class="margin-bottom--sm"><a class="footerLogoLink_BH7S" href="/"><img src="/img/pulsar-white.svg" alt="Pulsar Logo" class="themedImage_ToTc themedImage--light_HNdA footer__logo"><img src="/img/pulsar-white.svg" alt="Pulsar Logo" class="themedImage_ToTc themedImage--dark_i4oU footer__logo"></a></div><div class="footer__copyright"> |
| <div> |
| <img class="footer-apache-logo" src="/img/feather-logo-white.svg" alt="" width="20"> |
| The Apache Software Foundation |
| </div> |
| <p>Apache Pulsar is available under the Apache License, version 2.0. Apache Pulsar is an open-source, distributed messaging and streaming platform built for the cloud.</p> |
| <p>Copyright © 2024 The Apache Software Foundation. All Rights Reserved. Apache, Pulsar, Apache Pulsar, and the Apache feather logo are trademarks or registered trademarks of The Apache Software Foundation.</p> |
| </div></div></div></footer></div> |
| <script src="/assets/js/runtime~main.1d0ed2a7.js"></script> |
| <script src="/assets/js/main.e07a0c68.js"></script> |
| </body> |
| </html> |
