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Posted to commits@rocketmq.apache.org by li...@apache.org on 2017/06/08 10:10:07 UTC
[12/15] incubator-rocketmq-site git commit: Revert CSS
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+ <meta itemprop="datePublished" content="June 08, 2017">
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+ <header>
+ <h1 class="page__title" itemprop="headline">Best Practice For Producer
+</h1>
+
+ </header>
+
+
+ <section class="page__content" itemprop="text">
+ <p>Some useful tips for users.</p>
+
+<aside class="sidebar__right">
+<nav class="toc">
+ <header><h4 class="nav__title"><i class="fa fa-file-text"></i> On This Page</h4></header>
+<ul class="toc__menu" id="markdown-toc">
+ <li><a href="#sendstatus" id="markdown-toc-sendstatus">SendStatus</a> <ul>
+ <li><a href="#flush_disk_timeout" id="markdown-toc-flush_disk_timeout">FLUSH_DISK_TIMEOUT</a></li>
+ <li><a href="#flush_slave_timeout" id="markdown-toc-flush_slave_timeout">FLUSH_SLAVE_TIMEOUT</a></li>
+ <li><a href="#slave_not_available" id="markdown-toc-slave_not_available">SLAVE_NOT_AVAILABLE</a></li>
+ <li><a href="#send_ok" id="markdown-toc-send_ok">SEND_OK</a></li>
+ <li><a href="#duplication-or-missing" id="markdown-toc-duplication-or-missing">Duplication or Missing</a></li>
+ </ul>
+ </li>
+ <li><a href="#timeout" id="markdown-toc-timeout">Timeout</a></li>
+ <li><a href="#message-size" id="markdown-toc-message-size">Message Size</a></li>
+ <li><a href="#async-sending" id="markdown-toc-async-sending">Async Sending</a></li>
+ <li><a href="#producer-group" id="markdown-toc-producer-group">Producer Group</a></li>
+ <li><a href="#thread-safety" id="markdown-toc-thread-safety">Thread Safety</a></li>
+ <li><a href="#performance" id="markdown-toc-performance">Performance</a></li>
+</ul>
+
+ </nav>
+</aside>
+
+<h2 id="sendstatus">SendStatus</h2>
+<p>When sending a message, you will get SendResult which contains SendStatus. Firstly, we assume that Message’s isWaitStoreMsgOK=true(default is true). If not, we will always get SEND_OK if no exception is thrown.
+Below is a list of descriptions about each status:</p>
+<h3 id="flush_disk_timeout">FLUSH_DISK_TIMEOUT</h3>
+<p>If the Broker set MessageStoreConfig’s FlushDiskType=SYNC_FLUSH(default is ASYNC_FLUSH), and the Broker doesn’t finish flushing the disk within MessageStoreConfig’s syncFlushTimeout(default is 5 secs), you will get this status.</p>
+<h3 id="flush_slave_timeout">FLUSH_SLAVE_TIMEOUT</h3>
+<p>If the Broker’s role is SYNC_MASTER(default is ASYNC_MASTER), and the slave Broker doesn’t finish synchronizing with the master within the MessageStoreConfig’s syncFlushTimeout(default is 5 secs), you will get this status.</p>
+<h3 id="slave_not_available">SLAVE_NOT_AVAILABLE</h3>
+<p>If the Broker’s role is SYNC_MASTER(default is ASYNC_MASTER), but no slave Broker is configured, you will get this status.</p>
+<h3 id="send_ok">SEND_OK</h3>
+<p>SEND_OK does not mean it is reliable. To make sure no message would be lost, you should also enable SYNC_MASTER or SYNC_FLUSH.</p>
+<h3 id="duplication-or-missing">Duplication or Missing</h3>
+<p>If you get FLUSH_DISK_TIMEOUT, FLUSH_SLAVE_TIMEOUT and the Broker happens to shutdown right the moment, you can find your message missing.
+At this time, you have two choices, one is to let it go, which may cause this message to be lost; another is to resend the message, which may get message duplication.
+Often we suggest resend and find a way to handle the duplication removal when consuming. Unless you feel it doesn’t matter when some messages are lost.
+But keep in mind that resending is useless when you get SLAVE_NOT_AVAILABLE. If this happens, you should keep the scene and alert the Cluster Manager.</p>
+<h2 id="timeout">Timeout</h2>
+<p>The Client sends requests to Broker, and wait for the responses, but if the max wait time has elapsed and no response is returned, the Client will throw a RemotingTimeoutException.
+The default wait time is 3 seconds. You can also pass timeout argument using send(msg, timeout) instead of send(msg).
+Note that we do not suggest the wait time to be too small, as the Broker needs some time to flush the disk or synchronize with slaves. Also the value may have little effect if it exceeds syncFlushTimeout by a lot as Broker may return a response with FLUSH_SLAVE_TIMEOUT or FLUSH_SLAVE_TIMEOUT before the timeout.</p>
+<h2 id="message-size">Message Size</h2>
+<p>We suggest the size of message should be no more than 512K.</p>
+<h2 id="async-sending">Async Sending</h2>
+<p>Default send(msg) will block until the response is returned. So if you care about performance, we suggest you use send(msg, callback) which will act in the async way.</p>
+<h2 id="producer-group">Producer Group</h2>
+<p>Normally, the producer group has no effects. But if you are involved in a transaction, you should pay attention to it.
+By default, you can only create only one producer with the same producer group in the same JVM, which is usually enough.</p>
+<h2 id="thread-safety">Thread Safety</h2>
+<p>The producer is thread-safe, you can just use it in your business solution.</p>
+<h2 id="performance">Performance</h2>
+<p>If you want more than one producer in one JVM for big data processing, we suggest:</p>
+<ul>
+ <li>use async sending with a few producers (3~5 is enough)</li>
+ <li>setInstanceName for each producer</li>
+</ul>
+
+
+
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http://git-wip-us.apache.org/repos/asf/incubator-rocketmq-site/blob/af2718af/content/docs/broadcast-example/index.html
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+ <meta itemprop="headline" content="Broadcasting">
+ <meta itemprop="description" content="How to send broadcast messages in Apache RocketMQ.">
+ <meta itemprop="datePublished" content="June 08, 2017">
+ <meta itemprop="dateModified" content="April 24, 2017">
+
+ <div class="page__inner-wrap">
+
+ <header>
+ <h1 class="page__title" itemprop="headline">Broadcasting
+</h1>
+
+ </header>
+
+
+ <section class="page__content" itemprop="text">
+ <aside class="sidebar__right">
+<nav class="toc">
+ <header><h4 class="nav__title"><i class="fa fa-file-text"></i> On This Page</h4></header>
+<ul class="toc__menu" id="markdown-toc">
+ <li><a href="#what-is-broadcasting" id="markdown-toc-what-is-broadcasting">What is broadcasting</a></li>
+ <li><a href="#producer-example" id="markdown-toc-producer-example">Producer example</a></li>
+ <li><a href="#consumer-example" id="markdown-toc-consumer-example">Consumer example</a></li>
+</ul>
+
+ </nav>
+</aside>
+
+<h4 id="what-is-broadcasting">What is broadcasting</h4>
+<p>Broadcasting is sending a message to all subscribers of a topic. If you want all subscribers receive messages about a topic, broadcasting is a good choice.</p>
+
+<h4 id="producer-example">Producer example</h4>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="kd">public</span> <span class="kd">class</span> <span class="nc">BroadcastProducer</span> <span class="o">{</span>
+ <span class="kd">public</span> <span class="kd">static</span> <span class="kt">void</span> <span class="nf">main</span><span class="o">(</span><span class="n">String</span><span class="o">[]</span> <span class="n">args</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">Exception</span> <span class="o">{</span>
+ <span class="n">DefaultMQProducer</span> <span class="n">producer</span> <span class="o">=</span> <span class="k">new</span> <span class="n">DefaultMQProducer</span><span class="o">(</span><span class="s">"ProducerGroupName"</span><span class="o">);</span>
+ <span class="n">producer</span><span class="o">.</span><span class="na">start</span><span class="o">();</span>
+
+ <span class="k">for</span> <span class="o">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="o">;</span> <span class="n">i</span> <span class="o"><</span> <span class="mi">100</span><span class="o">;</span> <span class="n">i</span><span class="o">++){</span>
+ <span class="n">Message</span> <span class="n">msg</span> <span class="o">=</span> <span class="k">new</span> <span class="n">Message</span><span class="o">(</span><span class="s">"TopicTest"</span><span class="o">,</span>
+ <span class="s">"TagA"</span><span class="o">,</span>
+ <span class="s">"OrderID188"</span><span class="o">,</span>
+ <span class="s">"Hello world"</span><span class="o">.</span><span class="na">getBytes</span><span class="o">(</span><span class="n">RemotingHelper</span><span class="o">.</span><span class="na">DEFAULT_CHARSET</span><span class="o">));</span>
+ <span class="n">SendResult</span> <span class="n">sendResult</span> <span class="o">=</span> <span class="n">producer</span><span class="o">.</span><span class="na">send</span><span class="o">(</span><span class="n">msg</span><span class="o">);</span>
+ <span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">printf</span><span class="o">(</span><span class="s">"%s%n"</span><span class="o">,</span> <span class="n">sendResult</span><span class="o">);</span>
+ <span class="o">}</span>
+ <span class="n">producer</span><span class="o">.</span><span class="na">shutdown</span><span class="o">();</span>
+ <span class="o">}</span>
+<span class="o">}</span>
+</code></pre>
+</div>
+
+<h4 id="consumer-example">Consumer example</h4>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="kd">public</span> <span class="kd">class</span> <span class="nc">BroadcastConsumer</span> <span class="o">{</span>
+ <span class="kd">public</span> <span class="kd">static</span> <span class="kt">void</span> <span class="nf">main</span><span class="o">(</span><span class="n">String</span><span class="o">[]</span> <span class="n">args</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">Exception</span> <span class="o">{</span>
+ <span class="n">DefaultMQPushConsumer</span> <span class="n">consumer</span> <span class="o">=</span> <span class="k">new</span> <span class="n">DefaultMQPushConsumer</span><span class="o">(</span><span class="s">"example_group_name"</span><span class="o">);</span>
+
+ <span class="n">consumer</span><span class="o">.</span><span class="na">setConsumeFromWhere</span><span class="o">(</span><span class="n">ConsumeFromWhere</span><span class="o">.</span><span class="na">CONSUME_FROM_FIRST_OFFSET</span><span class="o">);</span>
+
+ <span class="c1">//set to broadcast mode</span>
+ <span class="n">consumer</span><span class="o">.</span><span class="na">setMessageModel</span><span class="o">(</span><span class="n">MessageModel</span><span class="o">.</span><span class="na">BROADCASTING</span><span class="o">);</span>
+
+ <span class="n">consumer</span><span class="o">.</span><span class="na">subscribe</span><span class="o">(</span><span class="s">"TopicTest"</span><span class="o">,</span> <span class="s">"TagA || TagC || TagD"</span><span class="o">);</span>
+
+ <span class="n">consumer</span><span class="o">.</span><span class="na">registerMessageListener</span><span class="o">(</span><span class="k">new</span> <span class="n">MessageListenerConcurrently</span><span class="o">()</span> <span class="o">{</span>
+
+ <span class="nd">@Override</span>
+ <span class="kd">public</span> <span class="n">ConsumeConcurrentlyStatus</span> <span class="nf">consumeMessage</span><span class="o">(</span><span class="n">List</span><span class="o"><</span><span class="n">MessageExt</span><span class="o">></span> <span class="n">msgs</span><span class="o">,</span>
+ <span class="n">ConsumeConcurrentlyContext</span> <span class="n">context</span><span class="o">)</span> <span class="o">{</span>
+ <span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">printf</span><span class="o">(</span><span class="n">Thread</span><span class="o">.</span><span class="na">currentThread</span><span class="o">().</span><span class="na">getName</span><span class="o">()</span> <span class="o">+</span> <span class="s">" Receive New Messages: "</span> <span class="o">+</span> <span class="n">msgs</span> <span class="o">+</span> <span class="s">"%n"</span><span class="o">);</span>
+ <span class="k">return</span> <span class="n">ConsumeConcurrentlyStatus</span><span class="o">.</span><span class="na">CONSUME_SUCCESS</span><span class="o">;</span>
+ <span class="o">}</span>
+ <span class="o">});</span>
+
+ <span class="n">consumer</span><span class="o">.</span><span class="na">start</span><span class="o">();</span>
+ <span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">printf</span><span class="o">(</span><span class="s">"Broadcast Consumer Started.%n"</span><span class="o">);</span>
+ <span class="o">}</span>
+<span class="o">}</span>
+</code></pre>
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+ <article class="page" itemscope itemtype="http://schema.org/CreativeWork">
+ <meta itemprop="headline" content="CLI Admin Tool">
+ <meta itemprop="description" content="RocketMQ provides a CLI admin tool belt to query, manage and diagnose various issues.">
+ <meta itemprop="datePublished" content="June 08, 2017">
+ <meta itemprop="dateModified" content="December 16, 2016">
+
+ <div class="page__inner-wrap">
+
+ <header>
+ <h1 class="page__title" itemprop="headline">CLI Admin Tool
+</h1>
+
+ </header>
+
+
+ <section class="page__content" itemprop="text">
+ <p>RocketMQ provides a CLI admin tool belt to query, manage and diagnose various issues.</p>
+
+<aside class="sidebar__right">
+<nav class="toc">
+ <header><h4 class="nav__title"><i class="fa fa-file-text"></i> On This Page</h4></header>
+<ul class="toc__menu" id="markdown-toc">
+ <li><a href="#prerequisite" id="markdown-toc-prerequisite">Prerequisite</a></li>
+ <li><a href="#how-to-get-it" id="markdown-toc-how-to-get-it">How To Get it</a></li>
+ <li><a href="#how-to-use" id="markdown-toc-how-to-use">How to use</a></li>
+ <li><a href="#command-manual" id="markdown-toc-command-manual">Command Manual</a></li>
+</ul>
+
+ </nav>
+</aside>
+
+<h1 id="prerequisite">Prerequisite</h1>
+
+<p>Make sure you have walked through <a href="/docs/quick-start/">Quick Start</a> and <a href="/docs/core-concept/">Core Concept</a> sections.</p>
+
+<h1 id="how-to-get-it">How To Get it</h1>
+
+<p>The admin tool is shipped along with RocketMQ. Whether you download a pre-built binary version or build from source by yourself, you have the tool with the package.</p>
+
+<p>If you want to look at the source code, please refer to <a href="https://github.com/apache/incubator-rocketmq/tree/master/tools">rocketmq-tools module</a></p>
+
+<h1 id="how-to-use">How to use</h1>
+
+<p>The Admin Tool is very user friendly. Here, for demonstration purpose, *nix environment is assumed.</p>
+
+<p>Change directory to ${PACKAGE}/bin, command <code class="highlighter-rouge">bash mqadmin</code>, you should see the following help menu.</p>
+
+<div class="highlighter-rouge"><pre class="highlight"><code>The most commonly used mqadmin commands are:
+ updateTopic Update or create topic
+ deleteTopic Delete topic from broker and NameServer.
+ updateSubGroup Update or create subscription group
+ deleteSubGroup Delete subscription group from broker.
+ updateBrokerConfig Update broker's config
+ updateTopicPerm Update topic perm
+ topicRoute Examine topic route info
+ topicStatus Examine topic Status info
+ topicClusterList Get cluster info for topic
+ brokerStatus Fetch broker runtime status data
+ queryMsgById Query Message by Id
+ queryMsgByKey Query Message by Key
+ queryMsgByUniqueKey Query Message by Unique key
+ queryMsgByOffset Query Message by offset
+ queryMsgByUniqueKey Query Message by Unique key
+ printMsg Print Message Detail
+ sendMsgStatus Send msg to broker.
+ brokerConsumeStats Fetch broker consume stats data
+ producerConnection Query producer's socket connection and client version
+ consumerConnection Query consumer's socket connection, client version and subscription
+ consumerProgress Query consumers's progress, speed
+ consumerStatus Query consumer's internal data structure
+ cloneGroupOffset Clone offset from other group.
+ clusterList List all of clusters
+ topicList Fetch all topic list from name server
+ updateKvConfig Create or update KV config.
+ deleteKvConfig Delete KV config.
+ wipeWritePerm Wipe write perm of broker in all name server
+ resetOffsetByTime Reset consumer offset by timestamp(without client restart).
+ updateOrderConf Create or update or delete order conf
+ cleanExpiredCQ Clean expired ConsumeQueue on broker.
+ cleanUnusedTopic Clean unused topic on broker.
+ startMonitoring Start Monitoring
+ statsAll Topic and Consumer tps stats
+ syncDocs Synchronize wiki and issue to github.com
+ allocateMQ Allocate MQ
+ checkMsgSendRT Check message send response time
+ clusterRT List All clusters Message Send RT
+
+See 'mqadmin help <command>' for more information on a specific command.
+</code></pre>
+</div>
+
+<p>As you see, the most commonly used commands are listed with a brief description. To get detailed manual of each command, <code class="highlighter-rouge">bash mqadmin help <command></code>. For example, command <code class="highlighter-rouge">bash mqadmin help clusterList</code> will bring out the following help text:</p>
+
+<div class="highlighter-rouge"><pre class="highlight"><code>usage: mqadmin clusterList [-h] [-i <arg>] [-m] [-n <arg>]
+ -h,--help Print help
+ -i,--interval <arg> specify intervals numbers, it is in seconds
+ -m,--moreStats Print more stats
+ -n,--namesrvAddr <arg> Name server address list, eg: 192.168.0.1:9876;192.168.0.2:9876
+</code></pre>
+</div>
+
+<p>The help text lists possible options and interpretation of each option.</p>
+
+<h1 id="command-manual">Command Manual</h1>
+
+
+ </section>
+
+ <footer class="page__meta">
+
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+ <p class="page__date"><strong><i class="fa fa-fw fa-calendar" aria-hidden="true"></i> Updated:</strong> <time datetime="2016-12-16">December 16, 2016</time></p>
+
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+
+ <div class="page__inner-wrap">
+
+ <header>
+ <h1 class="page__title" itemprop="headline">Cluster Configuration and Deployment
+</h1>
+
+ </header>
+
+
+ <section class="page__content" itemprop="text">
+ <h1 id="prerequisite">Prerequisite</h1>
+
+<p>Before starting this section, make sure you have read Quick Start section, in which core concepts and components of RocketMQ are introduced.</p>
+
+<aside class="sidebar__right">
+<nav class="toc">
+ <header><h4 class="nav__title"><i class="fa fa-file-text"></i> On This Page</h4></header>
+<ul class="toc__menu" id="markdown-toc">
+ <li><a href="#prerequisite" id="markdown-toc-prerequisite">Prerequisite</a></li>
+ <li><a href="#introduction" id="markdown-toc-introduction">Introduction</a></li>
+ <li><a href="#name-server" id="markdown-toc-name-server">Name Server</a></li>
+ <li><a href="#broker" id="markdown-toc-broker">Broker</a></li>
+ <li><a href="#disk-flush-type-sync_flush--async_flush" id="markdown-toc-disk-flush-type-sync_flush--async_flush">Disk Flush Type: SYNC_FLUSH / ASYNC_FLUSH</a></li>
+ <li><a href="#replication-sync--async-broker" id="markdown-toc-replication-sync--async-broker">Replication: Sync / Async Broker</a></li>
+ <li><a href="#configuration" id="markdown-toc-configuration">Configuration</a></li>
+ <li><a href="#deployment-example" id="markdown-toc-deployment-example">Deployment Example</a></li>
+</ul>
+
+ </nav>
+</aside>
+
+<h1 id="introduction">Introduction</h1>
+
+<p>This section is to introduce deployment solution that may be considered production ready. Generally speaking, we are deploying a resilient RocketMQ cluster having no single point of failure.</p>
+
+<h1 id="name-server">Name Server</h1>
+
+<p>To ensure the cluster can still operate normally when name server instance crashes, two or more name server instances are recommended. As long as there is one name server instance alive, the whole cluster remains serving.</p>
+
+<p>Name server follows share-nothing design paradigm. Brokers send heartbeat data to all name servers. Producers and consumers may query meta data from any one of name servers available while sending / consuming messages.</p>
+
+<h1 id="broker">Broker</h1>
+
+<p>Brokers can be divided into two categories according to their roles: master and slave. Master brokers can read and write while slave brokers can only read messages replicated from master. Master brokers have brokerID=0; brokerID of slave is non-zero.</p>
+
+<p>Brokers may also be grouped by the brokerName property. Slave brokers find their master through brokerName. One master broker along with zero, one or multiple slave brokers is called a broker set.</p>
+
+<p>In serious scenarios, we should have at least two broker sets. Each topic, as you guess, resides in two or more broker sets.</p>
+
+<h1 id="disk-flush-type-sync_flush--async_flush">Disk Flush Type: SYNC_FLUSH / ASYNC_FLUSH</h1>
+
+<p>Each broker can be configured to be sync or async in terms of IO flushing strategy. To put it simply, if your business tolerates none message loss at extreme scenarios like OS crash or power loss, SYNC_FLUSH mode is recommended. Broker of SYNC_FLUSH mode would flush each message it receives onto disk before acknowledging producer. Obviously, throughout of this mode is highly dependent on IOPS of your hard disk.</p>
+
+<p>Broker of ASYNC_FLUSH mode, on the other hand, takes advantage of group-committing: only flushes dirty page caches to disk periodically or when count of dirty page caches reaches certain amount. Hence, the latter yields better performance.</p>
+
+<h1 id="replication-sync--async-broker">Replication: Sync / Async Broker</h1>
+
+<p>Similar to many replication system, sync brokers await until commit log is replicated to a slave before acknowledging. Async brokers, instead, return immediately after messages are processed on master.</p>
+
+<h1 id="configuration">Configuration</h1>
+
+<p>There are three pre-built configurations shipped with the distribution of RocketMQ under conf folder for your reference:</p>
+
+<ol>
+ <li>2m-2s-sync</li>
+ <li>2m-2s-async</li>
+ <li>2m-noslave</li>
+</ol>
+
+<p>Note: all configurations uses ASYNC_FLUSH.</p>
+
+<h1 id="deployment-example">Deployment Example</h1>
+
+<p>For example, We want to have a cluster with 2 name servers, 2 broker sets with general purpose:
+for this example, we choose <code class="highlighter-rouge">2m-2s-sync</code>
+Assuming binary RocketMQ is at <code class="highlighter-rouge">/home/rocketmq/dist</code></p>
+
+<ol>
+ <li>
+ <p>Start up two name servers as is shown in Quick Start guide. Assume their IPs are 192.168.0.2 and 192.168.0.3.</p>
+ </li>
+ <li>
+ <p>Start brokers</p>
+
+ <p><code class="highlighter-rouge">cd /home/rocketmq/dist/bin</code></p>
+
+ <p><code class="highlighter-rouge">bash mqbroker -c ../conf/2m-2s-sync/broker-a.properties -n 192.168.0.2:9876,192.168.0.3:9876</code></p>
+
+ <p><code class="highlighter-rouge">bash mqbroker -c ../conf/2m-2s-sync/broker-a-s.properties -n 192.168.0.2:9876,192.168.0.3:9876</code></p>
+
+ <p><code class="highlighter-rouge">bash mqbroker -c ../conf/2m-2s-sync/broker-b.properties -n 192.168.0.2:9876,192.168.0.3:9876</code></p>
+
+ <p><code class="highlighter-rouge">bash mqbroker -c ../conf/2m-2s-sync/broker-b-s.properties -n 192.168.0.2:9876,192.168.0.3:9876</code></p>
+ </li>
+ <li>
+ <p>Verify</p>
+
+ <p>Execute the following command to verify</p>
+
+ <p><code class="highlighter-rouge">bash mqadmin clusterList</code></p>
+ </li>
+</ol>
+
+
+ </section>
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+ <p class="page__date"><strong><i class="fa fa-fw fa-calendar" aria-hidden="true"></i> Updated:</strong> <time datetime="2016-12-16">December 16, 2016</time></p>
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