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0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Administration</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Anti-affinity namespaces</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>Anti-affinity namespaces</h1></header><h2 class="anchor anchorWithStickyNavbar_LWe7" id="distribute-anti-affinity-namespaces-across-failure-domains">Distribute anti-affinity namespaces across failure domains<a href="#distribute-anti-affinity-namespaces-across-failure-domains" class="hash-link" aria-label="Direct link to Distribute anti-affinity namespaces across failure domains" title="Direct link to Distribute anti-affinity namespaces across failure domains"></a></h2><p>When your application has multiple namespaces and you want one of them available all the time to avoid any downtime, you can group these namespaces and distribute them across different <a href="/docs/next/reference-terminology/#failure-domain">failure domains</a> and different brokers. Thus, if one of the failure domains is down (due to release rollout or brokers restart), it only disrupts namespaces owned by that specific failure domain and the rest of the namespaces owned by other domains remain available without any impact.</p><p>Such a group of namespaces has anti-affinity to each other, that is, all the namespaces in this group are <a href="/docs/next/reference-terminology/#anti-affinity-namespaces">anti-affinity namespaces</a> and are distributed to different failure domains in a load-balanced manner.</p><p>As illustrated in the following figure, Pulsar has 2 failure domains (Domain1 and Domain2) and each domain has 2 brokers in it. You can create an anti-affinity namespace group that has 4 namespaces in it, and all the 4 namespaces have anti-affinity to each other. The load manager tries to distribute namespaces evenly across all the brokers in the same domain. Since each domain has 2 brokers, every broker owns one namespace from this anti-affinity namespace group, and you can see each domain owns 2 namespaces, and each broker owns 1 namespace.</p><p><img loading="lazy" alt="Distribute anti-affinity namespaces across failure domains" src="/assets/images/anti-affinity-namespaces-across-failure-domains-49c34611c66243659ac8382597e04281.svg" width="1546" height="741" class="img_ev3q"></p><p>The load manager follows an even distribution policy across failure domains to assign anti-affinity namespaces. The following table outlines the even-distributed assignment sequence illustrated in the above figure.</p><table><thead><tr><th align="left">Assignment sequence</th><th align="left">Namespace</th><th align="left">Failure domain candidates</th><th align="left">Broker candidates</th><th align="left">Selected broker</th></tr></thead><tbody><tr><td align="left">1</td><td align="left">Namespace1</td><td align="left">Domain1, Domain2</td><td align="left">Broker1, Broker2, Broker3, Broker4</td><td align="left">Domain1:Broker1</td></tr><tr><td align="left">2</td><td align="left">Namespace2</td><td align="left">Domain2</td><td align="left">Broker3, Broker4</td><td align="left">Domain2:Broker3</td></tr><tr><td align="left">3</td><td align="left">Namespace3</td><td align="left">Domain1, Domain2</td><td align="left">Broker2, Broker4</td><td align="left">Domain1:Broker2</td></tr><tr><td align="left">4</td><td align="left">Namespace4</td><td align="left">Domain2</td><td align="left">Broker4</td><td align="left">Domain2:Broker4</td></tr></tbody></table><div class="theme-admonition theme-admonition-tip alert alert--success admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>tip</div><div class="admonitionContent_S0QG"><ul><li><p>Each namespace belongs to only one anti-affinity group. If a namespace with an existing anti-affinity assignment is assigned to another anti-affinity group, the original assignment is dropped.</p></li><li><p>If there are more anti-affinity namespaces than failure domains, the load manager distributes namespaces evenly across all the domains, and also every domain distributes namespaces evenly across all the brokers under that domain.</p></li></ul></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="create-a-failure-domain-and-register-brokers">Create a failure domain and register brokers<a href="#create-a-failure-domain-and-register-brokers" class="hash-link" aria-label="Direct link to Create a failure domain and register brokers" title="Direct link to Create a failure domain and register brokers"></a></h3><div class="theme-admonition theme-admonition-note alert alert--secondary admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M6.3 5.69a.942.942 0 0 1-.28-.7c0-.28.09-.52.28-.7.19-.18.42-.28.7-.28.28 0 .52.09.7.28.18.19.28.42.28.7 0 .28-.09.52-.28.7a1 1 0 0 1-.7.3c-.28 0-.52-.11-.7-.3zM8 7.99c-.02-.25-.11-.48-.31-.69-.2-.19-.42-.3-.69-.31H6c-.27.02-.48.13-.69.31-.2.2-.3.44-.31.69h1v3c.02.27.11.5.31.69.2.2.42.31.69.31h1c.27 0 .48-.11.69-.31.2-.19.3-.42.31-.69H8V7.98v.01zM7 2.3c-3.14 0-5.7 2.54-5.7 5.68 0 3.14 2.56 5.7 5.7 5.7s5.7-2.55 5.7-5.7c0-3.15-2.56-5.69-5.7-5.69v.01zM7 .98c3.86 0 7 3.14 7 7s-3.14 7-7 7-7-3.12-7-7 3.14-7 7-7z"></path></svg></span>note</div><div class="admonitionContent_S0QG"><p>One broker can only be registered to a single failure domain.</p></div></div><p>To create a domain under a specific cluster and register brokers, run the following command:</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">pulsar-admin clusters create-failure-domain </span><span class="token operator">&lt;</span><span class="token plain">cluster-name</span><span class="token operator">&gt;</span><span class="token plain"> --domain-name </span><span class="token operator">&lt;</span><span class="token plain">domain-name</span><span class="token operator">&gt;</span><span class="token plain"> --broker-list </span><span class="token operator">&lt;</span><span class="token plain">broker-list-comma-separated</span><span class="token operator">&gt;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>You can also view, update, and delete domains under a specific cluster. For more information, refer to <a href="/reference/#/next/pulsar-admin/" target="_blank" rel="noopener noreferrer">Pulsar admin docs</a>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="create-an-anti-affinity-namespace-group">Create an anti-affinity namespace group<a href="#create-an-anti-affinity-namespace-group" class="hash-link" aria-label="Direct link to Create an anti-affinity namespace group" title="Direct link to Create an anti-affinity namespace group"></a></h3><p>An anti-affinity group is created automatically when the first namespace is assigned to the group. To assign a namespace to an anti-affinity group, run the following command. It sets an anti-affinity group name for a namespace.</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">pulsar-admin namespaces set-anti-affinity-group </span><span class="token operator">&lt;</span><span class="token plain">namespace</span><span class="token operator">&gt;</span><span class="token plain"> --group </span><span class="token operator">&lt;</span><span class="token plain">group-name</span><span class="token operator">&gt;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>For more information about <code>anti-affinity-group</code> related commands, refer to <a href="/reference/#/next/pulsar-admin/" target="_blank" rel="noopener noreferrer">Pulsar admin docs</a>.</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/apache/pulsar-site/edit/main/docs/administration-anti-affinity-namespaces.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 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