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itemtype=http://schema.org/CreativeWork><meta content="rabbitmq-tips | Nicksxs's Blog" itemprop=name><meta content="接触了一下rabbitmq,原来在选型的时候是在rabbitmq跟kafka之间做选择,网上搜了一下之后发现kafka的优势在于吞吐量,而rabbitmq相对注重可靠性,因为应用在im上,需要保证消息不能丢失所以就暂时选定rabbitmq, Message Queue的需求由来…" itemprop=description></span><header class=post-header><h1 itemprop="name headline" class=post-title>rabbitmq-tips</h1><div class=post-meta-container><div class=post-meta><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-calendar"></i> </span><span class=post-meta-item-text>发表于</span> <time itemprop="dateCreated datePublished" title="创建时间:2017-04-25 21:46:55" datetime=2017-04-25T21:46:55+08:00>2017-04-25</time> </span><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-folder"></i> </span><span class=post-meta-item-text>分类于</span> <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/php/ itemprop=url rel=index><span itemprop=name>php</span></a> </span></span><span class="post-meta-item cloudflare-page-counter" data-increment=true data-path=/2017/04/25/rabbitmq-tips/ data-title=rabbitmq-tips title=阅读次数><span class=post-meta-item-icon><i class="far fa-eye"></i> </span><span class=post-meta-item-text>阅读次数:</span> <span class=cloudflare-page-counter-count></span></span></div><div class=post-description>接触了一下rabbitmq,原来在选型的时候是在rabbitmq跟kafka之间做选择,网上搜了一下之后发现kafka的优势在于吞吐量,而rabbitmq相对注重可靠性,因为应用在im上,需要保证消息不能丢失所以就暂时选定rabbitmq, Message Queue的需求由来…</div></div></header><div class=post-body itemprop=articleBody><h2 id=rabbitmq-介绍><a title="rabbitmq 介绍" class=headerlink href=#rabbitmq-介绍></a>rabbitmq 介绍</h2><p>接触了一下rabbitmq,原来在选型的时候是在rabbitmq跟kafka之间做选择,网上搜了一下之后发现kafka的优势在于吞吐量,而rabbitmq相对注重可靠性,因为应用在im上,需要保证消息不能丢失所以就暂时选定rabbitmq,<br>Message Queue的需求由来已久,80年代最早在金融交易中,高盛等公司采用Teknekron公司的产品,当时的Message queuing软件叫做:the information bus(TIB)。 TIB被电信和通讯公司采用,路透社收购了Teknekron公司。之后,IBM开发了MQSeries,微软开发了Microsoft Message Queue(MSMQ)。这些商业MQ供应商的问题是厂商锁定,价格高昂。2001年,Java Message queuing试图解决锁定和交互性的问题,但对应用来说反而更加麻烦了。<br>RabbitMQ采用Erlang语言开发。Erlang语言由Ericson设计,专门为开发concurrent和distribution系统的一种语言,在电信领域使用广泛。OTP(Open Telecom Platform)作为Erlang语言的一部分,包含了很多基于Erlang开发的中间件/库/工具,如mnesia/SASL,极大方便了Erlang应用的开发。OTP就类似于Python语言中众多的module,用户借助这些module可以很方便的开发应用。<br>于是2004年,摩根大通和iMatrix开始着手<a href=https://en.wikipedia.org/wiki/Advanced_Message_Queuing_Protocol rel=noopener target=_blank>Advanced Message Queuing Protocol (AMQP)</a>开放标准的开发。2006年,AMQP规范发布。2007年,Rabbit技术公司基于AMQP标准开发的RabbitMQ 1.0 发布。所有主要的编程语言均有与代理接口通讯的客户端库。<h2 id=简单的使用经验><a class=headerlink href=#简单的使用经验 title=简单的使用经验></a>简单的使用经验</h2><h3 id=通俗的理解><a class=headerlink href=#通俗的理解 title=通俗的理解></a>通俗的理解</h3><p>这里介绍下其中的一些概念,connection表示和队列服务器的连接,一般情况下是tcp连接, channel表示通道,可以在一个连接上建立多个通道,这里主要是节省了tcp连接握手的成本,exchange可以理解成一个路由器,将消息推送给对应的队列queue,其实是像一个订阅的模式。<h3 id=集群经验><a class=headerlink href=#集群经验 title=集群经验></a>集群经验</h3><p><code>rabbitmqctl stop</code>这个是关闭rabbitmq,在搭建集群时候先关闭服务,然后使用<code>rabbitmq-server -detached</code>静默启动,这时候使用<code>rabbitmqctl cluster_status</code>查看集群状态,因为还没将节点加入集群,所以只能看到类似<figure class="highlight shell"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br></pre><td class=code><pre><span class=line>Cluster status of node rabbit@rabbit1 ...</span><br><span class=line>[{nodes,[{disc,[rabbit@rabbit1,rabbit@rabbit2,rabbit@rabbit3]}]},</span><br><span class=line> {running_nodes,[rabbit@rabbit2,rabbit@rabbit1]}]</span><br><span class=line>...done.</span><br></pre></table></figure><p>然后就可以把当前节点加入集群,<figure class="highlight shell"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br></pre><td class=code><pre><span class=line><span class="meta prompt_">rabbit2$ </span><span class=language-bash>rabbitmqctl stop_app <span class=comment>#这个stop_app与stop的区别是前者停的是rabbitmq应用,保留erlang节点,</span></span></span><br><span class=line> #后者是停止了rabbitmq和erlang节点</span><br><span class=line>Stopping node rabbit@rabbit2 ...done.</span><br><span class=line><span class="meta prompt_">rabbit2$ </span><span class=language-bash>rabbitmqctl join_cluster rabbit@rabbit1 <span class=comment>#这里可以用--ram指定将当前节点作为内存节点加入集群</span></span></span><br><span class=line>Clustering node rabbit@rabbit2 with [rabbit@rabbit1] ...done.</span><br><span class=line><span class="meta prompt_">rabbit2$ </span><span class=language-bash>rabbitmqctl start_app</span></span><br><span class=line>Starting node rabbit@rabbit2 ...done.</span><br></pre></table></figure><p>其他可以参考<a href=http://www.rabbitmq.com/clustering.html rel=noopener target=_blank>官方文档</a><h2 id=一些坑><a class=headerlink href=#一些坑 title=一些坑></a>一些坑</h2><h3 id=消息丢失><a class=headerlink href=#消息丢失 title=消息丢失></a>消息丢失</h3><p>这里碰到过一个坑,对于使用exchange来做消息路由的,会有一个情况,就是在routing_key没被订阅的时候,会将该条找不到路由对应的queue的消息丢掉<code>What happens if we break our contract and send a message with one or four words, like "orange" or "quick.orange.male.rabbit"? Well, these messages won't match any bindings and will be lost.</code><a href=http://www.rabbitmq.com/tutorials/tutorial-five-python.html rel=noopener target=_blank>对应链接</a>,而当使用空的exchange时,会保留消息,当出现消费者的时候就可以将收到之前生产者所推送的消息<a href=http://www.rabbitmq.com/tutorials/tutorial-two-python.html rel=noopener target=_blank>对应链接</a>,这里就是用了空的exchange。<h3 id=集群搭建><a class=headerlink href=#集群搭建 title=集群搭建></a>集群搭建</h3><p>集群搭建的时候有个erlang vm生成的random cookie,这个是用来做集群之间认证的,相同的cookie才能连接,但是如果通过vim打开复制后在其他几点新建文件写入会多一个换行,导致集群建立是报错,所以这里最好使用scp等传输命令直接传输cookie文件,同时要注意下cookie的文件权限。<br>另外在集群搭建的时候如果更改过hostname,那么要把rabbitmq的数据库删除,否则启动后会马上挂掉</div><footer class=post-footer><div class="affiliate-creative affiliate-creative--post-end" data-affiliate-id=tencent-cloud-general><a rel="sponsored noopener" aria-label=腾讯云产品优惠 href=https://cloud.tencent.com/act/cps/redirect?redirect=2446&cps_key=2e33a1eedb380997d03618b4a5ba6ca7&from=console target=_blank><img alt=腾讯云服务器、数据库和云产品优惠 decoding=async height=419 loading=lazy 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