| </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 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/txn-why/">Transactions</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/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"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--active" aria-expanded="true" 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><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/tutorials-tenant/">Set up a tenant</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/tutorials-namespace/">Create a namespace</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/tutorials-topic/">Create a topic</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/tutorials-produce-consume/">Produce and consume messages</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/cookbooks-compaction/">Topic compaction</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/cookbooks-deduplication/">Message deduplication </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/cookbooks-non-persistent/">Non-persistent messaging</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/cookbooks-retention-expiry/">Message retention and expiry</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/cookbooks-message-queue/">Message queue</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/cookbooks-bookkeepermetadata/">BookKeeper Ledger Metadata</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/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 itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/docs/next/how-to-landing/"><span itemprop="name">Tutorials</span></a><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">Message deduplication </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>Message deduplication</h1></header><p>Message deduplication could affect the performance of the brokers during informational snapshots.</p><p>To use message deduplication in Pulsar, you need to configure your Pulsar brokers, namespaces, or topics. It is recommended to modify the configuration in the clients, for example, setting send timeout to infinity.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="how-message-deduplication-works">How message deduplication works<a href="#how-message-deduplication-works" class="hash-link" aria-label="Direct link to How message deduplication works" title="Direct link to How message deduplication works"></a></h2><p>You can enable or disable message deduplication at broker, namespace, or topic level. By default, it is disabled on all brokers, namespaces, or topics. You can enable it in the following ways:</p><ul><li>Enable deduplication for all namespaces/topics at the broker level.</li><li>Enable deduplication for a specific namespace with the <code>pulsar-admin namespaces</code> interface.</li><li>Enable deduplication for a specific topic with the <code>pulsar-admin topics</code> interface.</li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="configure-message-deduplication">Configure message deduplication<a href="#configure-message-deduplication" class="hash-link" aria-label="Direct link to Configure message deduplication" title="Direct link to Configure message deduplication"></a></h2><p>You can configure message deduplication in Pulsar using the <a href="/docs/next/reference-configuration/#broker"><code>broker.conf</code></a> configuration file. The following deduplication-related parameters are available.</p><table><thead><tr><th align="left">Parameter</th><th align="left">Description</th><th align="left">Default</th></tr></thead><tbody><tr><td align="left"><code>brokerDeduplicationEnabled</code></td><td align="left">Sets the default behavior for message deduplication in the Pulsar broker. If it is set to <code>true</code>, message deduplication is enabled on all namespaces/topics. If it is set to <code>false</code>, you have to enable or disable deduplication at the namespace level or the topic level.</td><td align="left"><code>false</code></td></tr><tr><td align="left"><code>brokerDeduplicationMaxNumberOfProducers</code></td><td align="left">The maximum number of producers for which information is stored for deduplication purposes.</td><td align="left"><code>10000</code></td></tr><tr><td align="left"><code>brokerDeduplicationEntriesInterval</code></td><td align="left">The number of entries after which a deduplication informational snapshot is taken. A larger interval leads to fewer snapshots being taken, though this lengthens the topic recovery time (the time required for entries published after the snapshot to be replayed).</td><td align="left"><code>1000</code></td></tr><tr><td align="left"><code>brokerDeduplicationSnapshotIntervalSeconds</code></td><td align="left">The time period after which a deduplication informational snapshot is taken. It runs simultaneously with <code>brokerDeduplicationEntriesInterval</code>.</td><td align="left"><code>120</code></td></tr><tr><td align="left"><code>brokerDeduplicationProducerInactivityTimeoutMinutes</code></td><td align="left">The time of inactivity (in minutes) after which the broker discards deduplication information related to a disconnected producer.</td><td align="left"><code>360</code> (6 hours)</td></tr></tbody></table><h3 class="anchor anchorWithStickyNavbar_LWe7" id="set-default-value-at-the-broker-level">Set default value at the broker-level<a href="#set-default-value-at-the-broker-level" class="hash-link" aria-label="Direct link to Set default value at the broker-level" title="Direct link to Set default value at the broker-level"></a></h3><p>By default, message deduplication is <em>disabled</em> on all Pulsar namespaces/topics. To enable it on all namespaces/topics, set the <code>brokerDeduplicationEnabled</code> parameter to <code>true</code> and restart the broker.</p><p>Even if you set the value for <code>brokerDeduplicationEnabled</code>, enabling or disabling via Pulsar admin CLI overrides the default settings at the broker level.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="enable-message-deduplication-at-namespace-or-topic-level">Enable message deduplication at namespace or topic level<a href="#enable-message-deduplication-at-namespace-or-topic-level" class="hash-link" aria-label="Direct link to Enable message deduplication at namespace or topic level" title="Direct link to Enable message deduplication at namespace or topic level"></a></h3><p>Though message deduplication is disabled by default at the broker level, you can enable message deduplication for a specific namespace or topic using the <a href="/reference/#/next/pulsar-admin/namespaces?id=set-deduplication" target="_blank" rel="noopener noreferrer"><code>pulsar-admin namespaces set-deduplication</code></a> or the <a href="/reference/#/next/pulsar-admin/topics?id=set-deduplication" target="_blank" rel="noopener noreferrer"><code>pulsar-admin topics set-deduplication</code></a> command. You can use the <code>--enable</code>/<code>-e</code> flag and specify the namespace/topic.</p><p>The following example shows how to enable message deduplication at the namespace level.</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain">bin/pulsar-admin namespaces set-deduplication </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">public/default </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">--enable </span><span class="token comment" style="color:rgb(98, 114, 164)"># or just -e</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><h3 class="anchor anchorWithStickyNavbar_LWe7" id="disable-message-deduplication-at-namespace-or-topic-level">Disable message deduplication at namespace or topic level<a href="#disable-message-deduplication-at-namespace-or-topic-level" class="hash-link" aria-label="Direct link to Disable message deduplication at namespace or topic level" title="Direct link to Disable message deduplication at namespace or topic level"></a></h3><p>Even if you enable message deduplication at the broker level, you can disable message deduplication for a specific namespace or topic using the <a href="/reference/#/next/pulsar-admin/namespaces?id=set-deduplication" target="_blank" rel="noopener noreferrer"><code>pulsar-admin namespace set-deduplication</code></a> or the <a href="/reference/#/next/pulsar-admin/topics?id=set-deduplication" target="_blank" rel="noopener noreferrer"><code>pulsar-admin topics set-deduplication</code></a> command. Use the <code>--disable</code>/<code>-d</code> flag and specify the namespace/topic.</p><p>The following example shows how to disable message deduplication at the namespace level.</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain">bin/pulsar-admin namespaces set-deduplication </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">public/default </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">--disable </span><span class="token comment" style="color:rgb(98, 114, 164)"># or just -d</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="pulsar-clients">Pulsar clients<a href="#pulsar-clients" class="hash-link" aria-label="Direct link to Pulsar clients" title="Direct link to Pulsar clients"></a></h2><p>If you enable message deduplication in Pulsar brokers, namespaces, or topics, it is recommended to make the client retry infinitely the messages until it succeeds, otherwise it is possible to break the ordering guarantee as some requests may time out and the application does not know whether the request is successfully added to the topic or not.</p><p>So you need to complete the following tasks for your client producers:</p><ol><li>Specify a name for the producer (this is a requirement, Pulsar will use the producer name to filter duplicated messages).</li><li>Set the message timeout to <code>0</code> (namely, no timeout).</li></ol><p>The instructions for Java, Python, and C++ clients are different.</p><div class="tabs-container tabList__CuJ"><ul role="tablist" aria-orientation="horizontal" class="tabs"><li role="tab" tabindex="0" aria-selected="true" class="tabs__item tabItem_LNqP tabs__item--active">Java clients</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">Python clients</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">C++ clients</li></ul><div class="margin-top--md"><div role="tabpanel" class="tabItem_Ymn6"><p>To ensure the guarantee order on a <a href="/docs/next/cookbooks-deduplication/client-libraries-java-use/#create-a-producer">Java producer</a> sending to a topic with message deduplication enabled, set the producer name using the <code>producerName</code> setter, and set the timeout to <code>0</code> using the <code>sendTimeout</code> setter.</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 keyword" style="color:rgb(189, 147, 249);font-style:italic">import</span><span class="token plain"> </span><span class="token import namespace">org</span><span class="token import namespace punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token import namespace">apache</span><span class="token import namespace punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token import namespace">pulsar</span><span class="token import namespace punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token import namespace">client</span><span class="token import namespace punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token import namespace">api</span><span class="token import namespace punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token import class-name">Producer</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 keyword" style="color:rgb(189, 147, 249);font-style:italic">import</span><span class="token plain"> </span><span class="token import namespace">org</span><span class="token import namespace punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token import namespace">apache</span><span class="token import namespace punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token import namespace">pulsar</span><span class="token import namespace punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token import namespace">client</span><span class="token import namespace punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token import namespace">api</span><span class="token import namespace punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token import class-name">PulsarClient</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 keyword" style="color:rgb(189, 147, 249);font-style:italic">import</span><span class="token plain"> </span><span class="token import namespace">java</span><span class="token import namespace punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token import namespace">util</span><span class="token import namespace punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token import namespace">concurrent</span><span class="token import namespace punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token import class-name">TimeUnit</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" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token class-name">PulsarClient</span><span class="token plain"> pulsarClient </span><span class="token operator">=</span><span class="token plain"> </span><span class="token class-name">PulsarClient</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token function" style="color:rgb(80, 250, 123)">builder</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)">serviceUrl</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token string" style="color:rgb(255, 121, 198)">"pulsar://localhost:6650"</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)">build</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><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token class-name">Producer</span><span class="token plain"> producer </span><span class="token operator">=</span><span class="token plain"> pulsarClient</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token function" style="color:rgb(80, 250, 123)">newProducer</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)">producerName</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token string" style="color:rgb(255, 121, 198)">"producer-1"</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://public/default/topic-1"</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)">sendTimeout</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token number">0</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> </span><span class="token class-name">TimeUnit</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token constant" style="color:rgb(189, 147, 249)">SECONDS</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)">create</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></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><p>Not to break the guarantee order on a <a href="/docs/next/cookbooks-deduplication/client-libraries-python-use.md/#create-a-producer">Python producer</a> sending to a topic with message deduplication active, set the producer name using <code>producer_name</code>, and set the timeout to <code>0</code> using <code>send_timeout_millis</code>.</p><div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">import</span><span class="token plain"> pulsar</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">client </span><span class="token operator">=</span><span class="token plain"> pulsar</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">Client</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token string" style="color:rgb(255, 121, 198)">"pulsar://localhost:6650"</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">producer </span><span class="token operator">=</span><span class="token plain"> client</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">create_producer</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 string" style="color:rgb(255, 121, 198)">"persistent://public/default/topic-1"</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"> producer_name</span><span class="token operator">=</span><span class="token string" style="color:rgb(255, 121, 198)">"producer-1"</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"> send_timeout_millis</span><span class="token operator">=</span><span class="token number">0</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></div><div role="tabpanel" class="tabItem_Ymn6" hidden="">Not to break the guarantee order on a [C++ producer](client-libraries-cpp-use.md#create-a-producer) sending to a topic with message deduplication active, set the producer name using `producer_name`, and set the timeout to `0` using `send_timeout_millis`.<div class="language-cpp codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-cpp codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token macro property directive-hash">#</span><span class="token macro property directive keyword" style="color:rgb(189, 147, 249);font-style:italic">include</span><span class="token macro property"> </span><span class="token macro property string" style="color:rgb(255, 121, 198)"><pulsar/Client.h></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">std</span><span class="token double-colon punctuation" style="color:rgb(248, 248, 242)">::</span><span class="token plain">string serviceUrl </span><span class="token operator">=</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">"pulsar://localhost:6650"</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">std</span><span class="token double-colon punctuation" style="color:rgb(248, 248, 242)">::</span><span class="token plain">string topic </span><span class="token operator">=</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">"persistent://some-tenant/ns1/topic-1"</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">std</span><span class="token double-colon punctuation" style="color:rgb(248, 248, 242)">::</span><span class="token plain">string producerName </span><span class="token operator">=</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">"producer-1"</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" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">Client </span><span class="token function" style="color:rgb(80, 250, 123)">client</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">serviceUrl</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" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">ProducerConfiguration producerConfig</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">producerConfig</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token function" style="color:rgb(80, 250, 123)">setSendTimeout</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token number">0</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">producerConfig</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token function" style="color:rgb(80, 250, 123)">setProducerName</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">producerName</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" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">Producer producer</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" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">Result result </span><span class="token operator">=</span><span class="token plain"> client</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token function" style="color:rgb(80, 250, 123)">createProducer</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">topic</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> producerConfig</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"> producer</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></div></div></div></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/cookbooks-deduplication.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/cookbooks-compaction/"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Topic compaction</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/next/cookbooks-non-persistent/"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Non-persistent messaging</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="#how-message-deduplication-works" class="table-of-contents__link toc-highlight">How message deduplication works</a></li><li><a href="#configure-message-deduplication" class="table-of-contents__link toc-highlight">Configure message deduplication</a><ul><li><a href="#set-default-value-at-the-broker-level" class="table-of-contents__link toc-highlight">Set default value at the broker-level</a></li><li><a href="#enable-message-deduplication-at-namespace-or-topic-level" class="table-of-contents__link toc-highlight">Enable message deduplication at namespace or topic level</a></li><li><a href="#disable-message-deduplication-at-namespace-or-topic-level" class="table-of-contents__link toc-highlight">Disable message deduplication at namespace or topic level</a></li></ul></li><li><a href="#pulsar-clients" class="table-of-contents__link toc-highlight">Pulsar clients</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"> |
