<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Pulsar 2.0 · Apache Pulsar</title><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta name="generator" content="Docusaurus"/><meta name="description" content="Pulsar 2.0 is a major new release for Pulsar that brings some bold changes to the platform, including [simplified topic names](#topic-names), the addition of the [Pulsar Functions](/docs/en/2.6.0/functions-overview) feature, some terminology changes, and more."/><meta name="docsearch:version" content="2.6.0"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Pulsar 2.0 · Apache Pulsar"/><meta property="og:type" content="website"/><meta property="og:url" content="https://pulsar.apache.org/"/><meta property="og:description" content="Pulsar 2.0 is a major new release for Pulsar that brings some bold changes to the platform, including [simplified topic names](#topic-names), the addition of the [Pulsar Functions](/docs/en/2.6.0/functions-overview) feature, some terminology changes, and more."/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://pulsar.apache.org/img/pulsar.svg"/><link rel="shortcut icon" href="/img/pulsar.ico"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/atom-one-dark.min.css"/><link rel="alternate" type="application/atom+xml" href="https://pulsar.apache.org/blog/atom.xml" title="Apache Pulsar Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://pulsar.apache.org/blog/feed.xml" title="Apache Pulsar Blog RSS Feed"/><link rel="stylesheet" href="/css/code-blocks-buttons.css"/><script type="text/javascript" src="https://buttons.github.io/buttons.js"></script><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.0/clipboard.min.js"></script><script type="text/javascript" src="/js/custom.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head><body class="sideNavVisible separateOnPageNav"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/en"><img class="logo" src="/img/pulsar.svg" alt="Apache Pulsar"/></a><a href="/en/versions"><h3>2.6.0</h3></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class="siteNavGroupActive"><a href="/docs/en/2.6.0/getting-started-standalone" target="_self">Docs</a></li><li class=""><a href="/en/download" target="_self">Download</a></li><li class="siteNavGroupActive"><a href="/docs/en/2.6.0/client-libraries" target="_self">Clients</a></li><li class=""><a href="#restapis" target="_self">REST APIs</a></li><li class=""><a href="#cli" target="_self">Cli</a></li><li class=""><a href="/blog/" target="_self">Blog</a></li><li class=""><a href="#community" target="_self">Community</a></li><li class=""><a href="#apache" target="_self">Apache</a></li><li class=""><a href="https://pulsar-next.staged.apache.org/" target="_self">New Website (Beta)</a></li><span><li><a id="languages-menu" href="#"><img class="languages-icon" src="/img/language.svg" alt="Languages icon"/>English</a><div id="languages-dropdown" class="hide"><ul id="languages-dropdown-items"><li><a href="/docs/ja/2.6.0/pulsar-2.0">日本語</a></li><li><a href="/docs/fr/2.6.0/pulsar-2.0">Français</a></li><li><a href="/docs/ko/2.6.0/pulsar-2.0">한국어</a></li><li><a href="/docs/zh-CN/2.6.0/pulsar-2.0">中文</a></li><li><a href="/docs/zh-TW/2.6.0/pulsar-2.0">繁體中文</a></li><li><a href="https://crowdin.com/project/apache-pulsar" target="_blank" rel="noreferrer noopener">Help Translate</a></li></ul></div></li><script>
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Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/getting-started-helm">Run Pulsar in Kubernetes</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/client-libraries">Use Pulsar with client libraries</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Concepts and Architecture</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/concepts-overview">Overview</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/concepts-messaging">Messaging</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/concepts-architecture-overview">Architecture</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/concepts-clients">Clients</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/concepts-replication">Geo Replication</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/concepts-multi-tenancy">Multi 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class="navItem" href="/docs/en/2.6.0/schema-manage">Manage schema</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Pulsar Functions</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/functions-overview">Overview</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/functions-worker">Setup: Pulsar Functions Worker</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/functions-runtime">Setup: Configure Functions runtime</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/functions-develop">How-to: Develop</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/functions-debug">How-to: Debug</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/functions-deploy">How-to: Deploy</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/functions-cli">Reference: CLI</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/window-functions-context">Window Functions: Context</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Pulsar IO</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/io-overview">Overview</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/io-quickstart">Get started</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/io-use">Use</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/io-debug">Debug</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/io-connectors">Built-in connector</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/io-cdc">CDC connector</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/io-develop">Develop</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/io-cli">CLI</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Pulsar SQL</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/sql-overview">Overview</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/sql-getting-started">Query data</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/sql-deployment-configurations">Configuration and deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/sql-rest-api">REST APIs</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Kubernetes (Helm)</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/helm-overview">Overview</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/helm-prepare">Prepare</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/helm-install">Install</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/helm-deploy">Deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/helm-upgrade">Upgrade</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/helm-tools">Required Tools</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Deployment</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/deploy-aws">Amazon Web Services</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/deploy-kubernetes">Kubernetes</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/deploy-bare-metal">Bare metal</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/deploy-bare-metal-multi-cluster">Bare metal multi-cluster</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/deploy-monitoring">Monitoring</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Administration</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/administration-zk-bk">ZooKeeper and 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TLS</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/security-tls-authentication">Authentication using TLS</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/security-tls-keystore">Using TLS with KeyStore configure</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/security-jwt">Authentication using JWT</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/security-athenz">Authentication using Athenz</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/security-kerberos">Authentication using Kerberos</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/security-authorization">Authorization and ACLs</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/security-encryption">End-to-End Encryption</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/security-extending">Extending</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/security-bouncy-castle">Bouncy Castle Providers</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Performance</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/performance-pulsar-perf">Pulsar Perf</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Client Libraries</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/client-libraries-java">Java</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/client-libraries-go">Go</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/client-libraries-python">Python</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/client-libraries-cpp">C++</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/client-libraries-node">Node.js</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/client-libraries-websocket">WebSocket</a></li><li 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href="/docs/en/2.6.0/cookbooks-tiered-storage">Tiered Storage</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/cookbooks-compaction">Topic compaction</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/cookbooks-deduplication">Message deduplication</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/cookbooks-non-persistent">Non-persistent messaging</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/cookbooks-partitioned">Partitioned Topics</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/cookbooks-retention-expiry">Message retention and expiry</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/cookbooks-encryption">Encryption</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/cookbooks-message-queue">Message queue</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/cookbooks-bookkeepermetadata">BookKeeper Ledger Metadata</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Development</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/develop-tools">Simulation tools</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/developing-binary-protocol">Binary protocol</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/develop-schema">Custom schema storage</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/develop-load-manager">Modular load manager</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/develop-cpp">Building Pulsar C++ client</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle">Reference</h3><ul class=""><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/reference-terminology">Terminology</a></li><li class="navListItem"><a class="navItem" href="/docs/en/2.6.0/reference-cli-tools">Pulsar CLI tools</a></li><li 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<h2><a class="anchor" aria-hidden="true" id="new-features-in-pulsar-20"></a><a href="#new-features-in-pulsar-20" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>New features in Pulsar 2.0</h2>
<table>
<thead>
<tr><th style="text-align:left">Feature</th><th style="text-align:left">Description</th></tr>
</thead>
<tbody>
<tr><td style="text-align:left"><a href="/docs/en/2.6.0/functions-overview">Pulsar Functions</a></td><td style="text-align:left">A lightweight compute option for Pulsar</td></tr>
</tbody>
</table>
<h2><a class="anchor" aria-hidden="true" id="major-changes"></a><a href="#major-changes" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Major changes</h2>
<p>There are a few major changes that you should be aware of, as they may significantly impact your day-to-day usage.</p>
<h3><a class="anchor" aria-hidden="true" id="properties-versus-tenants"></a><a href="#properties-versus-tenants" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Properties versus tenants</h3>
<p>Previously, Pulsar had a concept of properties. A property is essentially the exact same thing as a tenant, so the &quot;property&quot; terminology has been removed in version 2.0. The <a href="/docs/en/2.6.0/reference-pulsar-admin#pulsar-admin"><code>pulsar-admin properties</code></a> command-line interface, for example, has been replaced with the <a href="/docs/en/2.6.0/reference-pulsar-admin#pulsar-admin-tenants"><code>pulsar-admin tenants</code></a> interface. In some cases the properties terminology is still used but is now considered deprecated and will be removed entirely in a future release.</p>
<h3><a class="anchor" aria-hidden="true" id="topic-names"></a><a href="#topic-names" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Topic names</h3>
<p>Prior to version 2.0, <em>all</em> Pulsar topics had the following form:</p>
<pre><code class="hljs css language-http">{persistent|non-persistent}://property/cluster/namespace/topic
</code></pre>
<p>Two important changes have been made in Pulsar 2.0:</p>
<ul>
<li>There is no longer a <a href="#no-cluster">cluster component</a></li>
<li>Properties have been <a href="#tenants">renamed to tenants</a></li>
<li>You can use a <a href="#flexible-topic-naming">flexible</a> naming system to shorten many topic names</li>
<li><code>/</code> is not allowed in topic name</li>
</ul>
<h4><a class="anchor" aria-hidden="true" id="no-cluster-component"></a><a href="#no-cluster-component" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>No cluster component</h4>
<p>The cluster component has been removed from topic names. Thus, all topic names now have the following form:</p>
<pre><code class="hljs css language-http">{persistent|non-persistent}://tenant/namespace/topic
</code></pre>
<blockquote>
<p>Existing topics that use the legacy name format will continue to work without any change, and there are no plans to change that.</p>
</blockquote>
<h4><a class="anchor" aria-hidden="true" id="flexible-topic-naming"></a><a href="#flexible-topic-naming" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Flexible topic naming</h4>
<p>All topic names in Pulsar 2.0 internally have the form shown <a href="#no-cluster-component">above</a> but you can now use shorthand names in many cases (for the sake of simplicity). The flexible naming system stems from the fact that there is now a default topic type, tenant, and namespace:</p>
<table>
<thead>
<tr><th style="text-align:left">Topic aspect</th><th style="text-align:left">Default</th></tr>
</thead>
<tbody>
<tr><td style="text-align:left">topic type</td><td style="text-align:left"><code>persistent</code></td></tr>
<tr><td style="text-align:left">tenant</td><td style="text-align:left"><code>public</code></td></tr>
<tr><td style="text-align:left">namespace</td><td style="text-align:left"><code>default</code></td></tr>
</tbody>
</table>
<p>The table below shows some example topic name translations that use implicit defaults:</p>
<table>
<thead>
<tr><th style="text-align:left">Input topic name</th><th style="text-align:left">Translated topic name</th></tr>
</thead>
<tbody>
<tr><td style="text-align:left"><code>my-topic</code></td><td style="text-align:left"><code>persistent://public/default/my-topic</code></td></tr>
<tr><td style="text-align:left"><code>my-tenant/my-namespace/my-topic</code></td><td style="text-align:left"><code>persistent://my-tenant/my-namespace/my-topic</code></td></tr>
</tbody>
</table>
<blockquote>
<p>For <a href="/docs/en/2.6.0/concepts-messaging#non-persistent-topics">non-persistent topics</a> you'll need to continue to specify the entire topic name, as the default-based rules for persistent topic names don't apply. Thus you cannot use a shorthand name like <code>non-persistent://my-topic</code> and would need to use <code>non-persistent://public/default/my-topic</code> instead</p>
</blockquote>
</span></div></article></div><div class="docs-prevnext"><a class="docs-next button" href="/docs/en/2.6.0/getting-started-standalone"><span>Run Pulsar locally</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#new-features-in-pulsar-20">New features in Pulsar 2.0</a></li><li><a href="#major-changes">Major changes</a><ul class="toc-headings"><li><a href="#properties-versus-tenants">Properties versus tenants</a></li><li><a href="#topic-names">Topic names</a></li></ul></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="copyright">Copyright © 2022 The Apache Software Foundation. All Rights Reserved. Apache, Apache Pulsar and the Apache feather logo are trademarks of The Apache Software Foundation.</section><span><script>
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