<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Pulsar geo-replication · Apache Pulsar</title><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta name="generator" content="Docusaurus"/><meta name="description" content="*Geo-replication* is the replication of persistently stored message data across multiple clusters of a Pulsar instance."/><meta name="docsearch:version" content="2.3.0"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Pulsar geo-replication · Apache Pulsar"/><meta property="og:type" content="website"/><meta property="og:url" content="https://pulsar.apache.org/"/><meta property="og:description" content="*Geo-replication* is the replication of persistently stored message data across multiple clusters of a Pulsar instance."/><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>2.3.0</h3></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class="siteNavGroupActive"><a href="/docs/en/2.3.0/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/2.3.0/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/2.3.0/administration-geo">日本語</a></li><li><a href="/docs/fr/2.3.0/administration-geo">Français</a></li><li><a href="/docs/ko/2.3.0/administration-geo">한국어</a></li><li><a href="/docs/zh-CN/2.3.0/administration-geo">中文</a></li><li><a href="/docs/zh-TW/2.3.0/administration-geo">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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<h2><a class="anchor" aria-hidden="true" id="how-it-works"></a><a href="#how-it-works" 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>How it works</h2>
<p>The diagram below illustrates the process of geo-replication across Pulsar clusters:</p>
<p><img src="/docs/assets/geo-replication.png" alt="Replication Diagram"></p>
<p>In this diagram, whenever producers <strong>P1</strong>, <strong>P2</strong>, and <strong>P3</strong> publish messages to the topic <strong>T1</strong> on clusters <strong>Cluster-A</strong>, <strong>Cluster-B</strong>, and <strong>Cluster-C</strong>, respectively, those messages are instantly replicated across clusters. Once replicated, consumers <strong>C1</strong> and <strong>C2</strong> can consume those messages from their respective clusters.</p>
<p>Without geo-replication, consumers <strong>C1</strong> and <strong>C2</strong> wouldn't be able to consume messages published by producer <strong>P3</strong>.</p>
<h2><a class="anchor" aria-hidden="true" id="geo-replication-and-pulsar-properties"></a><a href="#geo-replication-and-pulsar-properties" 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>Geo-replication and Pulsar properties</h2>
<p>Geo-replication must be enabled on a per-tenant basis in Pulsar. Geo-replication can be enabled between clusters only when a tenant has been created that allows access to both clusters.</p>
<p>Although geo-replication must be enabled between two clusters, it's actually managed at the namespace level. You must do the following to enable geo-replication for a namespace:</p>
<ul>
<li><a href="#creating-global-namespaces">Create a global namespace</a></li>
<li>Configure that namespace to replicate between two or more provisioned clusters</li>
</ul>
<p>Any message published on <em>any</em> topic in that namespace will then be replicated to all clusters in the specified set.</p>
<h2><a class="anchor" aria-hidden="true" id="local-persistence-and-forwarding"></a><a href="#local-persistence-and-forwarding" 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>Local persistence and forwarding</h2>
<p>When messages are produced on a Pulsar topic, they are first persisted in the local cluster and then forwarded asynchronously to the remote clusters.</p>
<p>In normal cases, when there are no connectivity issues, messages are replicated immediately, at the same time as they are dispatched to local consumers. Typically, end-to-end delivery latency is defined by the network <a href="https://en.wikipedia.org/wiki/Round-trip_delay_time">round-trip time</a> (RTT) between the remote regions.</p>
<p>Applications can create producers and consumers in any of the clusters, even when the remote clusters are not reachable (like during a network partition).</p>
<blockquote>
<h4><a class="anchor" aria-hidden="true" id="subscriptions-are-local-to-a-cluster"></a><a href="#subscriptions-are-local-to-a-cluster" 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>Subscriptions are local to a cluster</h4>
<p>While producers and consumers can publish to and consume from any cluster in a Pulsar instance, subscriptions are local to the clusters in which they are created and cannot be transferred between clusters. If you do need to transfer a subscription, you’ll need to create a new subscription in the desired cluster.</p>
</blockquote>
<p>In the example in the image above, the topic <strong>T1</strong> is being replicated between 3 clusters, <strong>Cluster-A</strong>, <strong>Cluster-B</strong>, and <strong>Cluster-C</strong>.</p>
<p>All messages produced in any cluster will be delivered to all subscriptions in all the other clusters. In this case, consumers <strong>C1</strong> and <strong>C2</strong> will receive all messages published by producers <strong>P1</strong>, <strong>P2</strong>, and <strong>P3</strong>. Ordering is still guaranteed on a per-producer basis.</p>
<h2><a class="anchor" aria-hidden="true" id="configuring-replication"></a><a href="#configuring-replication" 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>Configuring replication</h2>
<p>As stated <a href="#geo-replication-and-pulsar-properties">above</a>, geo-replication in Pulsar is managed at the <a href="/docs/en/2.3.0/reference-terminology#tenant">tenant</a> level.</p>
<h3><a class="anchor" aria-hidden="true" id="granting-permissions-to-properties"></a><a href="#granting-permissions-to-properties" 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>Granting permissions to properties</h3>
<p>To establish replication to a cluster, the tenant needs permission to use that cluster. This permission can be granted when the tenant is created or later on.</p>
<p>At creation time, specify all the intended clusters:</p>
<pre><code class="hljs css language-shell"><span class="hljs-meta">$</span><span class="bash"> bin/pulsar-admin properties create my-tenant \</span>
  --admin-roles my-admin-role \
  --allowed-clusters us-west,us-east,us-cent
</code></pre>
<p>To update permissions of an existing tenant, use <code>update</code> instead of <code>create</code>.</p>
<h3><a class="anchor" aria-hidden="true" id="creating-global-namespaces"></a><a href="#creating-global-namespaces" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Creating global namespaces</h3>
<p>Replication must be used with <em>global</em> topics, meaning topics that belong to a global namespace and are thus not tied to any particular cluster.</p>
<p>Global namespaces need to be created in the <code>global</code> virtual cluster. For example:</p>
<pre><code class="hljs css language-shell"><span class="hljs-meta">$</span><span class="bash"> bin/pulsar-admin namespaces create my-tenant/my-namespace</span>
</code></pre>
<p>Initially, the namespace is not assigned to any cluster. You can assign the namespace to clusters using the <code>set-clusters</code> subcommand:</p>
<pre><code class="hljs css language-shell"><span class="hljs-meta">$</span><span class="bash"> bin/pulsar-admin namespaces <span class="hljs-built_in">set</span>-clusters my-tenant/my-namespace \</span>
  --clusters us-west,us-east,us-cent
</code></pre>
<p>The replication clusters for a namespace can be changed at any time, with no disruption to ongoing traffic. Replication channels will be immediately set up or stopped in all the clusters as soon as the configuration changes.</p>
<h3><a class="anchor" aria-hidden="true" id="using-global-topics"></a><a href="#using-global-topics" 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>Using global topics</h3>
<p>Once you've created a global namespace, any topics that producers or consumers create within that namespace will be global. Typically, each application will use the <code>serviceUrl</code> for the local cluster.</p>
<h4><a class="anchor" aria-hidden="true" id="selective-replication"></a><a href="#selective-replication" 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>Selective replication</h4>
<p>By default, messages are replicated to all clusters configured for the namespace. You can restrict replication selectively by specifying a replication list for a message. That message will then be replicated only to the subset in the replication list.</p>
<p>Below is an example for the <a href="/docs/en/2.3.0/client-libraries-java">Java API</a>. Note the use of the <code>setReplicationClusters</code> method when constructing the <a href="https://pulsar.apache.org/api/client/2.3.0/org/apache/pulsar/client/api/Message">Message</a>
 object:</p>
<pre><code class="hljs css language-java">List&lt;String&gt; restrictReplicationTo = Arrays.asList(
        <span class="hljs-string">"us-west"</span>,
        <span class="hljs-string">"us-east"</span>
);

Producer producer = client.newProducer()
        .topic(<span class="hljs-string">"some-topic"</span>)
        .create();

producer.newMessage()
        .value(<span class="hljs-string">"my-payload"</span>.getBytes())
        .setReplicationClusters(restrictReplicationTo)
        .send();
</code></pre>
<h4><a class="anchor" aria-hidden="true" id="topic-stats"></a><a href="#topic-stats" 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 stats</h4>
<p>Topic-specific statistics for global topics are available via the <a href="/docs/en/2.3.0/reference-pulsar-admin"><code>pulsar-admin</code></a> tool and <a href="https://pulsar.apache.org/admin-rest-api#/">REST</a>
 API:</p>
<pre><code class="hljs css language-shell"><span class="hljs-meta">$</span><span class="bash"> bin/pulsar-admin persistent stats persistent://my-tenant/my-namespace/my-topic</span>
</code></pre>
<p>Each cluster reports its own local stats, including incoming and outgoing replication rates and backlogs.</p>
<h4><a class="anchor" aria-hidden="true" id="deleting-a-global-topic"></a><a href="#deleting-a-global-topic" 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>Deleting a global topic</h4>
<p>Given that global topics exist in multiple regions, it's not possible to directly delete a global topic. Instead, you should rely on automatic topic garbage collection.</p>
<p>In Pulsar, a topic is automatically deleted when it's no longer used, that is to say, when no producers or consumers are connected <em>and</em> there are no subscriptions <em>and</em> no more messages are kept for retention. For global topics, each region will use a fault-tolerant mechanism to decide when it's safe to delete the topic locally.</p>
<p>You can explicitly disable topic garbage collection by setting <code>brokerDeleteInactiveTopicsEnabled</code> to <code>false</code> in your <a href="reference-configuration#broker">broker configuration</a>.</p>
<p>To delete a global topic, close all producers and consumers on the topic and delete all its local subscriptions in every replication cluster. When Pulsar determines that no valid subscription for the topic remains across the system, it will garbage collect the topic.</p>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/en/2.3.0/administration-zk-bk"><span class="arrow-prev">← </span><span class="function-name-prevnext">ZooKeeper and BookKeeper</span></a><a class="docs-next button" href="/docs/en/2.3.0/administration-dashboard"><span>Next</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#how-it-works">How it works</a></li><li><a href="#geo-replication-and-pulsar-properties">Geo-replication and Pulsar properties</a></li><li><a href="#local-persistence-and-forwarding">Local persistence and forwarding</a></li><li><a href="#configuring-replication">Configuring replication</a><ul class="toc-headings"><li><a href="#granting-permissions-to-properties">Granting permissions to properties</a></li><li><a href="#creating-global-namespaces">Creating global namespaces</a></li><li><a href="#using-global-topics">Using global topics</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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