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.68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Best Practice</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">DLedger</span><meta itemprop="position" content="2"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: 4.x</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"><h1>DLedger</h1><h2 class="anchor anchorWithStickyNavbar_LWe7" id="dledger-quick-deployment">DLedger Quick Deployment<a href="#dledger-quick-deployment" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="preface">Preface<a href="#preface" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h3><p>DLedger is a set of distributed log storage components based on Raft protocol. When deploying RocketMQ, you can choose to use DLedger to replace the native replica storage mechanism. This document is mainly introduced for how to build and deploy auto failover RocketMQ cluster based on DLedger.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="1-build-from-source-code">1. Build from source code<a href="#1-build-from-source-code" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h3><p>The build phase is divided into two parts, DLedger should be built first, and then build RocketMQ.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="11-build-dledger">1.1 Build DLedger<a href="#11-build-dledger" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h4><div class="language-shell codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-shell codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">$ </span><span class="token function" style="color:#d73a49">git</span><span class="token plain"> clone https://github.com/openmessaging/dledger.git</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">$ </span><span class="token builtin class-name">cd</span><span class="token plain"> dledger</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">$ mvn clean </span><span class="token function" style="color:#d73a49">install</span><span class="token plain"> -DskipTests</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 viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" 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 viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h4 class="anchor anchorWithStickyNavbar_LWe7" id="12-build-rocketmq">1.2 Build RocketMQ<a href="#12-build-rocketmq" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h4><div class="language-shell codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-shell codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">$ </span><span class="token function" style="color:#d73a49">git</span><span class="token plain"> clone https://github.com/apache/rocketmq.git</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">$ </span><span class="token builtin class-name">cd</span><span class="token plain"> rocketmq</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">$ </span><span class="token function" style="color:#d73a49">git</span><span class="token plain"> checkout -b store_with_dledger origin/store_with_dledger</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">$ mvn -Prelease-all -DskipTests clean </span><span class="token function" style="color:#d73a49">install</span><span class="token plain"> -U</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 viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" 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 viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" 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="2-quick-deployment">2. Quick Deployment<a href="#2-quick-deployment" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h3><p>After building successfully</p><div class="language-shell codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-shell codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token comment" style="color:#999988;font-style:italic">#{rocketmq-version} replace with rocketmq actual version. example: 4.9.4</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">$ </span><span class="token builtin class-name">cd</span><span class="token plain"> distribution/target/rocketmq-</span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain">rocketmq-version</span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain">/rocketmq-</span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain">rocketmq-version</span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">$ </span><span class="token function" style="color:#d73a49">sh</span><span class="token plain"> bin/dledger/fast-try.sh start</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 viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" 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 viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>If the above commands executed successfully, then check cluster status by using mqadmin operation commands.</p><div class="language-shell codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-shell codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">$ </span><span class="token function" style="color:#d73a49">sh</span><span class="token plain"> bin/mqadmin clusterList -n </span><span class="token number" style="color:#36acaa">127.0</span><span class="token plain">.0.1:9876</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 viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" 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 viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>If everything goes well, the following content will appear:</p><p><img loading="lazy" src="https://img.alicdn.com/5476e8b07b923/TB11Z.ZyCzqK1RjSZFLXXcn2XXa" alt="ClusterList" class="img_ev3q"></p><p>（BID is 0 indicate Master, the others are Follower）</p><p>After the startup is successful, producer can produce message, and then test failover scenario.</p><p>Execute the following command to stop the cluster quickly:</p><div class="language-shell codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-shell codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">$ </span><span class="token function" style="color:#d73a49">sh</span><span class="token plain"> bin/dledger/fast-try.sh stop</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 viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" 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 viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Quick deployment, default configuration is in directory conf/dledger, default storage path is /tmp/rmqstore.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="3-failover">3. Failover<a href="#3-failover" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h3><p>After the successful deployment, kill the Leader process(as the above example, kill process that binds port 30931), then wait for 10 seconds, use clusterList command to check cluster status, and you could find that the Leader has been switched to another node.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="dledger-cluster-deployment">Dledger cluster deployment<a href="#dledger-cluster-deployment" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h2><p>This document introduces how to deploy auto failover RocketMQ-on-DLedger Group.</p><p>RocketMQ-on-DLedger Group is a broker group with <strong>same name</strong>, needs at least 3 nodes, elect a Leader by Raft algorithm automatically, the others as Follower, replicating data between Leader and Follower for system high available. |
