|
|
<!doctypehtml><html lang=zh-CN><meta charset=UTF-8><meta content=width=device-width name=viewport><meta media="(prefers-color-scheme: light)" content=#222 name=theme-color><meta media="(prefers-color-scheme: dark)" content=#222 name=theme-color><meta content="Hexo 7.3.0" name=generator><link href=https://cdnjs.cloudflare.com rel=preconnect><link href=/images/apple-touch-icon-next.png rel=apple-touch-icon sizes=180x180><link href=/images/favicon-32x32-next.png rel=icon sizes=32x32 type=image/png><link href=/images/favicon-16x16-next.png rel=icon sizes=16x16 type=image/png><link color=#222 href=/images/logo.svg rel=mask-icon><meta content=2X6S9P7CAjXjVvw8YyQR8pCu-B0oEu7O9quLgxXuWyA name=google-site-verification><meta content=dV8JGNzi0c name=baidu-site-verification><script>!function(){var t=!1;function e(){var e;t||(t=!0,(e=document.createElement("script")).setAttribute("data-ad-client","ca-pub-7480618470784058"),e.async=!0,e.src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js",document.head.appendChild(e))}function a(){"requestIdleCallback"in window?window.requestIdleCallback(e,{timeout:5e3}):window.setTimeout(e,5e3)}"complete"===document.readyState?a():window.addEventListener("load",a,{once:!0})}()</script><link href=/css/main.css rel=stylesheet><link crossorigin=anonymous href=https://cdnjs.cloudflare.com/ajax/libs/font-awesome/7.0.0/css/all.min.css integrity=sha256-VHqXKFhhMxcpubYf9xiWdCiojEbY9NexQ4jh8AxbvcM= rel=stylesheet><link crossorigin=anonymous href=https://cdnjs.cloudflare.com/ajax/libs/fancyapps-ui/6.1.14/fancybox/fancybox.css integrity=sha256-mdaMxrItEW6hMIVJJNPKuX0B7KCSJQVEv3mVY4N2we4= rel=stylesheet><script class=next-config data-name=main type=application/json>{"hostname":"nicksxs.me","root":"/","images":"/images","scheme":"Pisces","darkmode":true,"version":"8.29.0","exturl":false,"sidebar":{"position":"left","width_expanded":320,"width_dual_column":240,"display":"post","padding":18,"offset":12},"hljswrap":true,"codeblock":{"theme":{"light":"default","dark":"stackoverflow-dark"},"prism":{"light":"prism","dark":"prism-dark"},"copy_button":{"enable":true,"style":"default"},"fold":{"enable":false,"height":500},"language":false},"bookmark":{"enable":false,"color":"#222","save":"auto"},"mediumzoom":false,"pangu":false,"comments":{"style":"tabs","active":null,"storage":true,"lazyload":true,"nav":null},"stickytabs":false,"motion":{"enable":false,"async":false,"duration":200,"transition":{"menu_item":"fadeInDown","post_block":"fadeIn","post_header":"fadeInDown","post_body":"fadeInDown","coll_header":"fadeInLeft","sidebar":"fadeInUp"}},"prism":false,"i18n":{"placeholder":"搜索...","empty":"没有找到任何搜索结果:${query}","hits_time":"找到 ${hits} 个搜索结果(用时 ${time} 毫秒)","hits":"找到 ${hits} 个搜索结果"},"algolia":{"appID":"663Q99OQQD","apiKey":"e461a1371d12cec1491c1153b288a9ed","indexName":"nicksxs","hits":{"per_page":10}}}</script><script defer src=/js/config.js></script><meta content="rocketmq 里有一种比较特殊的用法,就是顺序消息,比如订单的生命周期里,在创建,支付,签收等状态轮转中,会发出来对应的消息,这里面就比较需要去保证他们的顺序,当然在处理的业务代码也可以做对应的处理,结合消息重投,但是如果这里消息就能保证顺序性了,那么业务代码就能更好的关注…" name=description><meta content=article property=og:type><meta content="聊一下 RocketMQ 的顺序消息" property=og:title><meta content=https://nicksxs.me/2021/08/29/%E8%81%8A%E4%B8%80%E4%B8%8B-RocketMQ-%E7%9A%84%E9%A1%BA%E5%BA%8F%E6%B6%88%E6%81%AF/index.html property=og:url><meta content="Nicksxs's Blog" property=og:site_name><meta content="rocketmq 里有一种比较特殊的用法,就是顺序消息,比如订单的生命周期里,在创建,支付,签收等状态轮转中,会发出来对应的消息,这里面就比较需要去保证他们的顺序,当然在处理的业务代码也可以做对应的处理,结合消息重投,但是如果这里消息就能保证顺序性了,那么业务代码就能更好的关注…" property=og:description><meta content=zh_CN property=og:locale><meta content=2021-08-29T12:41:17.000Z property=article:published_time><meta content=2021-08-29T12:41:17.000Z property=article:modified_time><meta content=Nicksxs property=article:author><meta content=MQ property=article:tag><meta content=消息队列 property=article:tag><meta content=RocketMQ property=article:tag><meta content=summary name=twitter:card><link href=https://nicksxs.me/2021/08/29/%E8%81%8A%E4%B8%80%E4%B8%8B-RocketMQ-%E7%9A%84%E9%A1%BA%E5%BA%8F%E6%B6%88%E6%81%AF/ rel=canonical><script class=next-config data-name=page type=application/json>{"sidebar":"","isHome":false,"isPost":true,"lang":"zh-CN","comments":true,"permalink":"https://nicksxs.me/2021/08/29/%E8%81%8A%E4%B8%80%E4%B8%8B-RocketMQ-%E7%9A%84%E9%A1%BA%E5%BA%8F%E6%B6%88%E6%81%AF/","path":"2021/08/29/聊一下-RocketMQ-的顺序消息/","title":"聊一下 RocketMQ 的顺序消息"}</script><script class=next-config data-name=calendar type=application/json>""</script><title>聊一下 RocketMQ 的顺序消息 | Nicksxs's Blog</title><script async src=https://www.googletagmanager.com/gtag/js?id=UA-61358619-1></script><script class=next-config data-name=google_analytics type=application/json>{"tracking_id":"UA-61358619-1","only_pageview":false,"measure_protocol_api_secret":null}</script><script defer src=/js/third-party/analytics/google-analytics.js></script><script defer src=/js/third-party/analytics/baidu-analytics.js></script><script async src=https://hm.baidu.com/hm.js?20f33b3c0c0eff9b1522999c0015646d></script><script crossorigin=anonymous defer integrity=sha256-QnJV4HT5r8i89ovZGRD86iynZqHerEbT2xt69vDM36I= src=https://cdnjs.cloudflare.com/ajax/libs/fancyapps-ui/6.1.14/fancybox/fancybox.umd.js></script><script defer src=/js/utils.js></script><script defer src=/js/sidebar.js></script><script defer src=/js/next-boot.js></script><script data-algolia-integrity=sha256-o49zoHLDPBm9WLg6AiliAVi3axCRTqe3ltTxLvhzAVg= data-algolia-src=https://cdnjs.cloudflare.com/ajax/libs/algoliasearch/5.36.0/lite/builds/browser.umd.js data-search-src=/js/third-party/search/algolia-search.js src=/js/third-party/search/algolia-search-loader.js></script><script defer src=/js/third-party/fancybox.js></script><noscript><link href=/css/noscript.css rel=stylesheet></noscript><link title="Nicksxs's Blog" href=/atom.xml rel=alternate type=application/atom+xml><body itemscope itemtype=http://schema.org/WebPage><div class=headband></div><main class=main><div class=column><header class=header itemscope itemtype=http://schema.org/WPHeader><div class=site-brand-container><div class=site-nav-toggle><div aria-label=切换导航栏 class=toggle role=button><span class=toggle-line></span><span class=toggle-line></span><span class=toggle-line></span></div></div><div class=site-meta><a class=brand href=/ rel=start><i class=logo-line></i><p class=site-title>Nicksxs's Blog</p><i class=logo-line></i></a><p class=site-subtitle itemprop=description>Java 运行时、生产诊断与 AI 工程实践</div><div class=site-nav-right><div class="toggle popup-trigger" aria-label=搜索 role=button><i class="fa fa-search fa-fw fa-lg"></i></div></div></div><nav class=site-nav><ul class="main-menu menu"><li class="menu-item menu-item-home"><a href=/ rel=section><i class="fa fa-home fa-fw"></i>首页</a><li class="menu-item menu-item-专题"><a href=/topics/ rel=section><i class="fa fa-layer-group fa-fw"></i>专题</a><li class="menu-item menu-item-工具"><a href=/tools/ rel=section><i class="fa fa-toolbox fa-fw"></i>工具</a><li class="menu-item menu-item-about"><a href=/about/ rel=section><i class="fa fa-user fa-fw"></i>关于我</a><li class="menu-item menu-item-tags"><a href=/tags/ rel=section><i class="fa fa-tags fa-fw"></i>标签</a><li class="menu-item menu-item-categories"><a href=/categories/ rel=section><i class="fa fa-th fa-fw"></i>分类</a><li class="menu-item menu-item-archives"><a href=/archives/ rel=section><i class="fa fa-archive fa-fw"></i>归档</a><li class="menu-item menu-item-search"><a class=popup-trigger role=button><i class="fa fa-search fa-fw"></i>搜索</a></ul></nav><div class=search-pop-overlay><div class="popup search-popup"><div class=search-header><span class=search-icon><i class="fa fa-search"></i></span><div class=search-input-container><input autocapitalize=off autocomplete=off class=search-input maxlength=80 placeholder=搜索... spellcheck=false type=search></div><span class=popup-btn-close role=button><i class="fa fa-times-circle"></i></span></div><div class=search-result-container><div class=search-result-icon><i class="fab fa-algolia fa-5x"></i></div></div></div></div></header><aside class=sidebar><div class="sidebar-inner sidebar-overview-active"><ul class=sidebar-nav><li class=sidebar-nav-toc>文章目录<li class=sidebar-nav-overview>站点概览</ul><div class=sidebar-panel-container><div class="post-toc-wrap sidebar-panel"></div><div class="site-overview-wrap sidebar-panel"><div class="site-author animated" itemprop=author itemscope itemtype=http://schema.org/Person><img alt=Nicksxs class=site-author-image itemprop=image src=/uploads/avatar.jpg><p class=site-author-name itemprop=name>Nicksxs<div class=site-description itemprop=description>Nicksxs 的技术博客,深入 Java 运行时与生产诊断、低成本大模型推理和 Agent 工程实践。</div></div><div class="site-state-wrap animated"><nav class=site-state><div class="site-state-item site-state-posts"><a href=/archives/><span class=site-state-item-count>394</span> <span class=site-state-item-name>日志</span></a></div><div class="site-state-item site-state-categories"><a href=/categories/><span class=site-state-item-count>181</span> <span class=site-state-item-name>分类</span></a></div><div class="site-state-item site-state-tags"><a href=/tags/><span class=site-state-item-count>347</span> <span class=site-state-item-name>标签</span></a></div></nav></div><div class="links-of-author animated"><span class=links-of-author-item><a rel="noopener me" title="GitHub → https://github.com/nicksxs" href=https://github.com/nicksxs target=_blank><i class="fab fa-github fa-fw"></i>GitHub</a> </span><span class=links-of-author-item><a rel="noopener me" title="E-Mail → mailto:nicksxs1202@gmail.com" href=mailto:nicksxs1202@gmail.com target=_blank><i class="fa fa-envelope fa-fw"></i>E-Mail</a></span></div><div class="cc-license animated" itemprop=license><a class=cc-opacity href=https://creativecommons.org/licenses/by-nc-sa/4.0/ rel=noopener target=_blank><img alt="Creative Commons" src=https://cdnjs.cloudflare.com/ajax/libs/creativecommons-vocabulary/2020.11.3/assets/license_badges/small/by_nc_sa.svg></a></div><div class="widget-wrap sidebar-tag-cloud"><div class=tag-cloud-tags><a class=tag-cloud-10 href=/tags/Java/ style=font-size:16px>Java</a><a class=tag-cloud-9 href=/tags/leetcode/ style=font-size:15.62px>leetcode</a><a class=tag-cloud-8 href=/tags/LLM/ style=font-size:15.23px>LLM</a><a class=tag-cloud-8 href=/tags/%E7%94%9F%E6%B4%BB/ style=font-size:14.85px>生活</a><a class=tag-cloud-7 href=/tags/%E9%A2%98%E8%A7%A3/ style=font-size:14.46px>题解</a><a class=tag-cloud-6 href=/tags/SpringBoot/ style=font-size:14.08px>SpringBoot</a><a class=tag-cloud-6 href=/tags/MySQL/ style=font-size:14.08px>MySQL</a><a class=tag-cloud-5 href=/tags/C/ style=font-size:13.69px>C++</a><a class=tag-cloud-5 href=/tags/Redis/ style=font-size:13.31px>Redis</a><a class=tag-cloud-4 href=/tags/Tomcat/ style=font-size:12.92px>Tomcat</a><a class=tag-cloud-4 href=/tags/Mybatis/ style=font-size:12.92px>Mybatis</a><a class=tag-cloud-3 href=/tags/%E5%B0%8F%E6%8A%80%E5%B7%A7/ style=font-size:12.54px>小技巧</a><a class=tag-cloud-2 href=/tags/%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84/ style=font-size:12.15px>数据结构</a><a class=tag-cloud-2 href=/tags/%E6%BA%90%E7%A0%81/ style=font-size:12.15px>源码</a><a class=tag-cloud-2 href=/tags/MQ/ style=font-size:11.77px>MQ</a><a class=tag-cloud-2 href=/tags/%E6%B6%88%E6%81%AF%E9%98%9F%E5%88%97/ style=font-size:11.77px>消息队列</a><a class=tag-cloud-2 href=/tags/RocketMQ/ style=font-size:11.77px>RocketMQ</a><a class=tag-cloud-2 href=/tags/%E8%BF%90%E5%8A%A8/ style=font-size:11.77px>运动</a><a class=tag-cloud-1 href=/tags/php/ style=font-size:11.38px>php</a><a class=tag-cloud-0 href=/tags/Spring/ style=font-size:11px>Spring</a><a class=tag-cloud-0 href=/tags/linux/ style=font-size:11px>linux</a><a class=tag-cloud-0 href=/tags/Docker/ style=font-size:11px>Docker</a><a class=tag-cloud-0 href=/tags/%E5%87%8F%E8%82%A5/ style=font-size:11px>减肥</a><a class=tag-cloud-0 href=/tags/%E8%B7%91%E6%AD%A5/ style=font-size:11px>跑步</a></div></div><div class="affiliate-creative affiliate-creative--sidebar" 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 src=/uploads/affiliate/tencent-cloud-general.webp width=690> </a><span class=affiliate-disclosure>推广</span></div></div></div></div><div class="sidebar-inner sidebar-blogroll"><div class="links-of-blogroll animated"><div class=links-of-blogroll-title><i class="fa fa-globe fa-fw"></i> 链接</div><ul class=links-of-blogroll-list><li class=links-of-blogroll-item><a href=https://covermusic.cn/ rel=noopener target=_blank title=https://covermusic.cn>69伙伴</a></ul></div></div></aside></div><div class="main-inner post posts-expand"><div class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article lang=zh-CN><link href=https://nicksxs.me/2021/08/29/%E8%81%8A%E4%B8%80%E4%B8%8B-RocketMQ-%E7%9A%84%E9%A1%BA%E5%BA%8F%E6%B6%88%E6%81%AF/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="Nicksxs 的技术博客,深入 Java 运行时与生产诊断、低成本大模型推理和 Agent 工程实践。" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="聊一下 RocketMQ 的顺序消息 | Nicksxs's Blog" itemprop=name><meta content="rocketmq 里有一种比较特殊的用法,就是顺序消息,比如订单的生命周期里,在创建,支付,签收等状态轮转中,会发出来对应的消息,这里面就比较需要去保证他们的顺序,当然在处理的业务代码也可以做对应的处理,结合消息重投,但是如果这里消息就能保证顺序性了,那么业务代码就能更好的关注…" itemprop=description></span><header class=post-header><h1 itemprop="name headline" class=post-title>聊一下 RocketMQ 的顺序消息</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:2021-08-29 20:41:17" datetime=2021-08-29T20:41:17+08:00>2021-08-29</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/MQ/ itemprop=url rel=index><span itemprop=name>MQ</span></a> </span>, <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/MQ/RocketMQ/ itemprop=url rel=index><span itemprop=name>RocketMQ</span></a> </span>, <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/MQ/RocketMQ/%E6%B6%88%E6%81%AF%E9%98%9F%E5%88%97/ itemprop=url rel=index><span itemprop=name>消息队列</span></a> </span></span><span class="post-meta-item cloudflare-page-counter" data-title="聊一下 RocketMQ 的顺序消息" data-increment=true data-path=/2021/08/29/%E8%81%8A%E4%B8%80%E4%B8%8B-RocketMQ-%E7%9A%84%E9%A1%BA%E5%BA%8F%E6%B6%88%E6%81%AF/ 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>rocketmq 里有一种比较特殊的用法,就是顺序消息,比如订单的生命周期里,在创建,支付,签收等状态轮转中,会发出来对应的消息,这里面就比较需要去保证他们的顺序,当然在处理的业务代码也可以做对应的处理,结合消息重投,但是如果这里消息就能保证顺序性了,那么业务代码就能更好的关注…</div></div></header><div class=post-body itemprop=articleBody><p>rocketmq 里有一种比较特殊的用法,就是顺序消息,比如订单的生命周期里,在创建,支付,签收等状态轮转中,会发出来对应的消息,这里面就比较需要去保证他们的顺序,当然在处理的业务代码也可以做对应的处理,结合消息重投,但是如果这里消息就能保证顺序性了,那么业务代码就能更好的关注业务代码的处理。<p>首先有一种情况是全局的有序,比如对于一个 topic 里就得发送线程保证只有一个,内部的 queue 也只有一个,消费线程也只有一个,这样就能比较容易的保证全局顺序性了,但是这里的问题就是完全限制了性能,不是很现实,在真实场景里很多都是比如对于同一个订单,需要去保证状态的轮转是按照预期的顺序来,而不必要全局的有序性。<p>对于这类的有序性,需要在发送和接收方都有对应的处理,在发送消息中,需要去指定 selector,即<code>MessageQueueSelector</code>,能够以固定的方式是分配到对应的 <code>MessageQueue</code><p>比如像 RocketMQ 中的示例<figure class="highlight java"><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><span class=line>8</span><br></pre><td class=code><pre><span class=line><span class=type>SendResult</span> <span class=variable>sendResult</span> <span class=operator>=</span> producer.send(msg, <span class=keyword>new</span> <span class="title class_">MessageQueueSelector</span>() {</span><br><span class=line> <span class=meta>@Override</span></span><br><span class=line> <span class=keyword>public</span> MessageQueue <span class="title function_">select</span><span class=params>(List<MessageQueue> mqs, Message msg, Object arg)</span> {</span><br><span class=line> <span class=type>Long</span> <span class=variable>id</span> <span class=operator>=</span> (Long) arg; <span class=comment>//message queue is selected by #salesOrderID</span></span><br><span class=line> <span class=type>long</span> <span class=variable>index</span> <span class=operator>=</span> id % mqs.size();</span><br><span class=line> <span class=keyword>return</span> mqs.get((<span class=type>int</span>) index);</span><br><span class=line> }</span><br><span class=line> }, orderList.get(i).getOrderId());</span><br></pre></table></figure><p>而在消费侧有几个点比较重要,首先我们要保证一个 MessageQueue只被一个消费者消费,消费队列存在broker端,要保证 MessageQueue 只被一个消费者消费,那么消费者在进行消息拉取消费时就<strong>必须向mq服务器申请队列锁</strong>,消费者申请队列锁的代码存在于RebalanceService消息队列负载的实现代码中。<figure class="highlight java"><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><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br></pre><td class=code><pre><span class=line>List<PullRequest> pullRequestList = <span class=keyword>new</span> <span class="title class_">ArrayList</span><PullRequest>();</span><br><span class=line> <span class=keyword>for</span> (MessageQueue mq : mqSet) {</span><br><span class=line> <span class=keyword>if</span> (!<span class=built_in>this</span>.processQueueTable.containsKey(mq)) {</span><br><span class=line> <span class=comment>// 判断是否顺序,如果是顺序消费的,则需要加锁</span></span><br><span class=line> <span class=keyword>if</span> (isOrder && !<span class=built_in>this</span>.lock(mq)) {</span><br><span class=line> log.warn(<span class=string>"doRebalance, {}, add a new mq failed, {}, because lock failed"</span>, consumerGroup, mq);</span><br><span class=line> <span class=keyword>continue</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=built_in>this</span>.removeDirtyOffset(mq);</span><br><span class=line> <span class=type>ProcessQueue</span> <span class=variable>pq</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">ProcessQueue</span>();</span><br><span class=line> <span class=type>long</span> <span class=variable>nextOffset</span> <span class=operator>=</span> <span class=built_in>this</span>.computePullFromWhere(mq);</span><br><span class=line> <span class=keyword>if</span> (nextOffset >= <span class=number>0</span>) {</span><br><span class=line> <span class=type>ProcessQueue</span> <span class=variable>pre</span> <span class=operator>=</span> <span class=built_in>this</span>.processQueueTable.putIfAbsent(mq, pq);</span><br><span class=line> <span class=keyword>if</span> (pre != <span class=literal>null</span>) {</span><br><span class=line> log.info(<span class=string>"doRebalance, {}, mq already exists, {}"</span>, consumerGroup, mq);</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> log.info(<span class=string>"doRebalance, {}, add a new mq, {}"</span>, consumerGroup, mq);</span><br><span class=line> <span class=type>PullRequest</span> <span class=variable>pullRequest</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">PullRequest</span>();</span><br><span class=line> pullRequest.setConsumerGroup(consumerGroup);</span><br><span class=line> pullRequest.setNextOffset(nextOffset);</span><br><span class=line> pullRequest.setMessageQueue(mq);</span><br><span class=line> pullRequest.setProcessQueue(pq);</span><br><span class=line> pullRequestList.add(pullRequest);</span><br><span class=line> changed = <span class=literal>true</span>;</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> log.warn(<span class=string>"doRebalance, {}, add new mq failed, {}"</span>, consumerGroup, mq);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> }</span><br></pre></table></figure><p>在申请到锁之后会创建 pullRequest 进行消息拉取,消息拉取部分的代码实现在PullMessageService中,<figure class="highlight java"><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><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">run</span><span class=params>()</span> {</span><br><span class=line> log.info(<span class=built_in>this</span>.getServiceName() + <span class=string>" service started"</span>);</span><br><span class=line></span><br><span class=line> <span class=keyword>while</span> (!<span class=built_in>this</span>.isStopped()) {</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=type>PullRequest</span> <span class=variable>pullRequest</span> <span class=operator>=</span> <span class=built_in>this</span>.pullRequestQueue.take();</span><br><span class=line> <span class=built_in>this</span>.pullMessage(pullRequest);</span><br><span class=line> } <span class=keyword>catch</span> (InterruptedException ignored) {</span><br><span class=line> } <span class=keyword>catch</span> (Exception e) {</span><br><span class=line> log.error(<span class=string>"Pull Message Service Run Method exception"</span>, e);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> log.info(<span class=built_in>this</span>.getServiceName() + <span class=string>" service end"</span>);</span><br><span class=line> }</span><br></pre></table></figure><p>消息拉取完后,需要提交到ConsumeMessageService中进行消费,顺序消费的实现为ConsumeMessageOrderlyService,提交消息进行消费的方法为ConsumeMessageOrderlyService#submitConsumeRequest,具体实现如下:<figure class="highlight java"><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><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line><span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">submitConsumeRequest</span><span class=params>(</span></span><br><span class=line><span class=params> <span class=keyword>final</span> List<MessageExt> msgs,</span></span><br><span class=line><span class=params> <span class=keyword>final</span> ProcessQueue processQueue,</span></span><br><span class=line><span class=params> <span class=keyword>final</span> MessageQueue messageQueue,</span></span><br><span class=line><span class=params> <span class=keyword>final</span> <span class=type>boolean</span> dispathToConsume)</span> {</span><br><span class=line> <span class=keyword>if</span> (dispathToConsume) {</span><br><span class=line> <span class=type>ConsumeRequest</span> <span class=variable>consumeRequest</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">ConsumeRequest</span>(processQueue, messageQueue);</span><br><span class=line> <span class=built_in>this</span>.consumeExecutor.submit(consumeRequest);</span><br><span class=line> }</span><br><span class=line>}</span><br></pre></table></figure><p>构建了一个ConsumeRequest对象,它是个实现了 runnable 接口的类,并提交给了线程池来并行消费,看下顺序消费的ConsumeRequest的run方法实现:<figure class="highlight java"><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><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br><span class=line>49</span><br><span class=line>50</span><br><span class=line>51</span><br><span class=line>52</span><br><span class=line>53</span><br><span class=line>54</span><br><span class=line>55</span><br><span class=line>56</span><br><span class=line>57</span><br><span class=line>58</span><br><span class=line>59</span><br><span class=line>60</span><br><span class=line>61</span><br><span class=line>62</span><br><span class=line>63</span><br><span class=line>64</span><br><span class=line>65</span><br><span class=line>66</span><br><span class=line>67</span><br><span class=line>68</span><br><span class=line>69</span><br><span class=line>70</span><br><span class=line>71</span><br><span class=line>72</span><br><span class=line>73</span><br><span class=line>74</span><br><span class=line>75</span><br><span class=line>76</span><br><span class=line>77</span><br><span class=line>78</span><br><span class=line>79</span><br><span class=line>80</span><br><span class=line>81</span><br><span class=line>82</span><br><span class=line>83</span><br><span class=line>84</span><br><span class=line>85</span><br><span class=line>86</span><br><span class=line>87</span><br><span class=line>88</span><br><span class=line>89</span><br><span class=line>90</span><br><span class=line>91</span><br><span class=line>92</span><br><span class=line>93</span><br><span class=line>94</span><br><span class=line>95</span><br><span class=line>96</span><br><span class=line>97</span><br><span class=line>98</span><br><span class=line>99</span><br><span class=line>100</span><br><span class=line>101</span><br><span class=line>102</span><br><span class=line>103</span><br><span class=line>104</span><br><span class=line>105</span><br><span class=line>106</span><br><span class=line>107</span><br><span class=line>108</span><br><span class=line>109</span><br><span class=line>110</span><br><span class=line>111</span><br><span class=line>112</span><br><span class=line>113</span><br><span class=line>114</span><br><span class=line>115</span><br><span class=line>116</span><br><span class=line>117</span><br><span class=line>118</span><br><span class=line>119</span><br><span class=line>120</span><br><span class=line>121</span><br><span class=line>122</span><br><span class=line>123</span><br><span class=line>124</span><br><span class=line>125</span><br><span class=line>126</span><br><span class=line>127</span><br><span class=line>128</span><br><span class=line>129</span><br><span class=line>130</span><br><span class=line>131</span><br><span class=line>132</span><br><span class=line>133</span><br><span class=line>134</span><br><span class=line>135</span><br><span class=line>136</span><br><span class=line>137</span><br><span class=line>138</span><br><span class=line>139</span><br><span class=line>140</span><br><span class=line>141</span><br><span class=line>142</span><br><span class=line>143</span><br><span class=line>144</span><br><span class=line>145</span><br><span class=line>146</span><br></pre><td class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">run</span><span class=params>()</span> {</span><br><span class=line> <span class=keyword>if</span> (<span class=built_in>this</span>.processQueue.isDropped()) {</span><br><span class=line> log.warn(<span class=string>"run, the message queue not be able to consume, because it's dropped. {}"</span>, <span class=built_in>this</span>.messageQueue);</span><br><span class=line> <span class=keyword>return</span>;</span><br><span class=line> }</span><br><span class=line> <span class=comment>// 获得 Consumer 消息队列锁,即单个线程独占</span></span><br><span class=line> <span class=keyword>final</span> <span class=type>Object</span> <span class=variable>objLock</span> <span class=operator>=</span> messageQueueLock.fetchLockObject(<span class=built_in>this</span>.messageQueue);</span><br><span class=line> <span class=keyword>synchronized</span> (objLock) {</span><br><span class=line> <span class=comment>// (广播模式) 或者 (集群模式 && Broker消息队列锁有效)</span></span><br><span class=line> <span class=keyword>if</span> (MessageModel.BROADCASTING.equals(ConsumeMessageOrderlyService.<span class=built_in>this</span>.defaultMQPushConsumerImpl.messageModel())</span><br><span class=line> || (<span class=built_in>this</span>.processQueue.isLocked() && !<span class=built_in>this</span>.processQueue.isLockExpired())) {</span><br><span class=line> <span class=keyword>final</span> <span class=type>long</span> <span class=variable>beginTime</span> <span class=operator>=</span> System.currentTimeMillis();</span><br><span class=line> <span class=comment>// 循环</span></span><br><span class=line> <span class=keyword>for</span> (<span class=type>boolean</span> <span class=variable>continueConsume</span> <span class=operator>=</span> <span class=literal>true</span>; continueConsume; ) {</span><br><span class=line> <span class=keyword>if</span> (<span class=built_in>this</span>.processQueue.isDropped()) {</span><br><span class=line> log.warn(<span class=string>"the message queue not be able to consume, because it's dropped. {}"</span>, <span class=built_in>this</span>.messageQueue);</span><br><span class=line> <span class=keyword>break</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// 消息队列分布式锁未锁定,提交延迟获得锁并消费请求</span></span><br><span class=line> <span class=keyword>if</span> (MessageModel.CLUSTERING.equals(ConsumeMessageOrderlyService.<span class=built_in>this</span>.defaultMQPushConsumerImpl.messageModel())</span><br><span class=line> && !<span class=built_in>this</span>.processQueue.isLocked()) {</span><br><span class=line> log.warn(<span class=string>"the message queue not locked, so consume later, {}"</span>, <span class=built_in>this</span>.messageQueue);</span><br><span class=line> ConsumeMessageOrderlyService.<span class=built_in>this</span>.tryLockLaterAndReconsume(<span class=built_in>this</span>.messageQueue, <span class=built_in>this</span>.processQueue, <span class=number>10</span>);</span><br><span class=line> <span class=keyword>break</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// 消息队列分布式锁已经过期,提交延迟获得锁并消费请求</span></span><br><span class=line> <span class=keyword>if</span> (MessageModel.CLUSTERING.equals(ConsumeMessageOrderlyService.<span class=built_in>this</span>.defaultMQPushConsumerImpl.messageModel())</span><br><span class=line> && <span class=built_in>this</span>.processQueue.isLockExpired()) {</span><br><span class=line> log.warn(<span class=string>"the message queue lock expired, so consume later, {}"</span>, <span class=built_in>this</span>.messageQueue);</span><br><span class=line> ConsumeMessageOrderlyService.<span class=built_in>this</span>.tryLockLaterAndReconsume(<span class=built_in>this</span>.messageQueue, <span class=built_in>this</span>.processQueue, <span class=number>10</span>);</span><br><span class=line> <span class=keyword>break</span>;</span><br><span class=line> }</span><br><span class=line> <span class=comment>// 当前周期消费时间超过连续时长,默认:60s,提交延迟消费请求。默认情况下,每消费1分钟休息10ms。</span></span><br><span class=line> <span class=type>long</span> <span class=variable>interval</span> <span class=operator>=</span> System.currentTimeMillis() - beginTime;</span><br><span class=line> <span class=keyword>if</span> (interval > MAX_TIME_CONSUME_CONTINUOUSLY) {</span><br><span class=line> ConsumeMessageOrderlyService.<span class=built_in>this</span>.submitConsumeRequestLater(processQueue, messageQueue, <span class=number>10</span>);</span><br><span class=line> <span class=keyword>break</span>;</span><br><span class=line> }</span><br><span class=line> <span class=comment>// 获取消费消息。此处和并发消息请求不同,并发消息请求已经带了消费哪些消息。</span></span><br><span class=line> <span class=keyword>final</span> <span class=type>int</span> <span class=variable>consumeBatchSize</span> <span class=operator>=</span></span><br><span class=line> ConsumeMessageOrderlyService.<span class=built_in>this</span>.defaultMQPushConsumer.getConsumeMessageBatchMaxSize();</span><br><span class=line></span><br><span class=line> List<MessageExt> msgs = <span class=built_in>this</span>.processQueue.takeMessags(consumeBatchSize);</span><br><span class=line> defaultMQPushConsumerImpl.resetRetryAndNamespace(msgs, defaultMQPushConsumer.getConsumerGroup());</span><br><span class=line> <span class=keyword>if</span> (!msgs.isEmpty()) {</span><br><span class=line> <span class=keyword>final</span> <span class=type>ConsumeOrderlyContext</span> <span class=variable>context</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">ConsumeOrderlyContext</span>(<span class=built_in>this</span>.messageQueue);</span><br><span class=line></span><br><span class=line> <span class=type>ConsumeOrderlyStatus</span> <span class=variable>status</span> <span class=operator>=</span> <span class=literal>null</span>;</span><br><span class=line></span><br><span class=line> <span class=type>ConsumeMessageContext</span> <span class=variable>consumeMessageContext</span> <span class=operator>=</span> <span class=literal>null</span>;</span><br><span class=line> <span class=keyword>if</span> (ConsumeMessageOrderlyService.<span class=built_in>this</span>.defaultMQPushConsumerImpl.hasHook()) {</span><br><span class=line> consumeMessageContext = <span class=keyword>new</span> <span class="title class_">ConsumeMessageContext</span>();</span><br><span class=line> consumeMessageContext</span><br><span class=line> .setConsumerGroup(ConsumeMessageOrderlyService.<span class=built_in>this</span>.defaultMQPushConsumer.getConsumerGroup());</span><br><span class=line> consumeMessageContext.setNamespace(defaultMQPushConsumer.getNamespace());</span><br><span class=line> consumeMessageContext.setMq(messageQueue);</span><br><span class=line> consumeMessageContext.setMsgList(msgs);</span><br><span class=line> consumeMessageContext.setSuccess(<span class=literal>false</span>);</span><br><span class=line> <span class=comment>// init the consume context type</span></span><br><span class=line> consumeMessageContext.setProps(<span class=keyword>new</span> <span class="title class_">HashMap</span><String, String>());</span><br><span class=line> ConsumeMessageOrderlyService.<span class=built_in>this</span>.defaultMQPushConsumerImpl.executeHookBefore(consumeMessageContext);</span><br><span class=line> }</span><br><span class=line> <span class=comment>// 执行消费</span></span><br><span class=line> <span class=type>long</span> <span class=variable>beginTimestamp</span> <span class=operator>=</span> System.currentTimeMillis();</span><br><span class=line> <span class=type>ConsumeReturnType</span> <span class=variable>returnType</span> <span class=operator>=</span> ConsumeReturnType.SUCCESS;</span><br><span class=line> <span class=type>boolean</span> <span class=variable>hasException</span> <span class=operator>=</span> <span class=literal>false</span>;</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=built_in>this</span>.processQueue.getLockConsume().lock(); <span class=comment>// 锁定处理队列</span></span><br><span class=line> <span class=keyword>if</span> (<span class=built_in>this</span>.processQueue.isDropped()) {</span><br><span class=line> log.warn(<span class=string>"consumeMessage, the message queue not be able to consume, because it's dropped. {}"</span>,</span><br><span class=line> <span class=built_in>this</span>.messageQueue);</span><br><span class=line> <span class=keyword>break</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> status = messageListener.consumeMessage(Collections.unmodifiableList(msgs), context);</span><br><span class=line> } <span class=keyword>catch</span> (Throwable e) {</span><br><span class=line> log.warn(<span class=string>"consumeMessage exception: {} Group: {} Msgs: {} MQ: {}"</span>,</span><br><span class=line> RemotingHelper.exceptionSimpleDesc(e),</span><br><span class=line> ConsumeMessageOrderlyService.<span class=built_in>this</span>.consumerGroup,</span><br><span class=line> msgs,</span><br><span class=line> messageQueue);</span><br><span class=line> hasException = <span class=literal>true</span>;</span><br><span class=line> } <span class=keyword>finally</span> {</span><br><span class=line> <span class=built_in>this</span>.processQueue.getLockConsume().unlock(); <span class=comment>// 解锁</span></span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (<span class=literal>null</span> == status</span><br><span class=line> || ConsumeOrderlyStatus.ROLLBACK == status</span><br><span class=line> || ConsumeOrderlyStatus.SUSPEND_CURRENT_QUEUE_A_MOMENT == status) {</span><br><span class=line> log.warn(<span class=string>"consumeMessage Orderly return not OK, Group: {} Msgs: {} MQ: {}"</span>,</span><br><span class=line> ConsumeMessageOrderlyService.<span class=built_in>this</span>.consumerGroup,</span><br><span class=line> msgs,</span><br><span class=line> messageQueue);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=type>long</span> <span class=variable>consumeRT</span> <span class=operator>=</span> System.currentTimeMillis() - beginTimestamp;</span><br><span class=line> <span class=keyword>if</span> (<span class=literal>null</span> == status) {</span><br><span class=line> <span class=keyword>if</span> (hasException) {</span><br><span class=line> returnType = ConsumeReturnType.EXCEPTION;</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> returnType = ConsumeReturnType.RETURNNULL;</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (consumeRT >= defaultMQPushConsumer.getConsumeTimeout() * <span class=number>60</span> * <span class=number>1000</span>) {</span><br><span class=line> returnType = ConsumeReturnType.TIME_OUT;</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (ConsumeOrderlyStatus.SUSPEND_CURRENT_QUEUE_A_MOMENT == status) {</span><br><span class=line> returnType = ConsumeReturnType.FAILED;</span><br><span class=line> } <span class=keyword>else</span> <span class=keyword>if</span> (ConsumeOrderlyStatus.SUCCESS == status) {</span><br><span class=line> returnType = ConsumeReturnType.SUCCESS;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (ConsumeMessageOrderlyService.<span class=built_in>this</span>.defaultMQPushConsumerImpl.hasHook()) {</span><br><span class=line> consumeMessageContext.getProps().put(MixAll.CONSUME_CONTEXT_TYPE, returnType.name());</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (<span class=literal>null</span> == status) {</span><br><span class=line> status = ConsumeOrderlyStatus.SUSPEND_CURRENT_QUEUE_A_MOMENT;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (ConsumeMessageOrderlyService.<span class=built_in>this</span>.defaultMQPushConsumerImpl.hasHook()) {</span><br><span class=line> consumeMessageContext.setStatus(status.toString());</span><br><span class=line> consumeMessageContext</span><br><span class=line> .setSuccess(ConsumeOrderlyStatus.SUCCESS == status || ConsumeOrderlyStatus.COMMIT == status);</span><br><span class=line> ConsumeMessageOrderlyService.<span class=built_in>this</span>.defaultMQPushConsumerImpl.executeHookAfter(consumeMessageContext);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> ConsumeMessageOrderlyService.<span class=built_in>this</span>.getConsumerStatsManager()</span><br><span class=line> .incConsumeRT(ConsumeMessageOrderlyService.<span class=built_in>this</span>.consumerGroup, messageQueue.getTopic(), consumeRT);</span><br><span class=line></span><br><span class=line> continueConsume = ConsumeMessageOrderlyService.<span class=built_in>this</span>.processConsumeResult(msgs, status, context, <span class=built_in>this</span>);</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> continueConsume = <span class=literal>false</span>;</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> <span class=keyword>if</span> (<span class=built_in>this</span>.processQueue.isDropped()) {</span><br><span class=line> log.warn(<span class=string>"the message queue not be able to consume, because it's dropped. {}"</span>, <span class=built_in>this</span>.messageQueue);</span><br><span class=line> <span class=keyword>return</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> ConsumeMessageOrderlyService.<span class=built_in>this</span>.tryLockLaterAndReconsume(<span class=built_in>this</span>.messageQueue, <span class=built_in>this</span>.processQueue, <span class=number>100</span>);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> }</span><br></pre></table></figure><p>获取到锁对象后,使用synchronized尝试申请线程级独占锁。<p><strong>如果加锁成功</strong>,同一时刻只有一个线程进行消息消费。<p><strong>如果加锁失败</strong>,会延迟100ms重新尝试向broker端申请锁定messageQueue,锁定成功后重新提交消费请求<p>创建消息拉取任务时,消息客户端向broker端申请锁定MessageQueue,使得一个MessageQueue同一个时刻只能被一个消费客户端消费。<p>消息消费时,多线程针对同一个消息队列的消费先尝试使用synchronized申请独占锁,加锁成功才能进行消费,使得一个MessageQueue同一个时刻只能被一个消费客户端中一个线程消费。<br>这里其实还有很重要的一点是对processQueue的加锁,这里其实是保证了在 rebalance的过程中如果 processQueue 被分配给了另一个 consumer,但是当前已经被我这个 consumer 再消费,但是没提交,就有可能出现被两个消费者消费,所以得进行加锁保证不受 rebalance 影响。</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 src=/uploads/affiliate/tencent-cloud-general.webp width=690> </a><span class=affiliate-disclosure>推广</span></div><div class=reward-container><div>请我一杯咖啡吧!</div><button>赞赏</button><div class=post-reward><div><img alt="Nicksxs 微信" src=https://i.loli.net/2020/01/12/NUlWanT31E8LQGx.png><span>微信</span></div><div><img alt="Nicksxs 支付宝" src=https://ooo.0o0.ooo/2016/08/17/57b421e773057.jpg><span>支付宝</span></div></div></div><div class=post-copyright><ul><li class=post-copyright-author><strong>本文作者: </strong>Nicksxs<li class=post-copyright-link><strong>本文链接:</strong> <a title="聊一下 RocketMQ 的顺序消息" href=https://nicksxs.me/2021/08/29/%E8%81%8A%E4%B8%80%E4%B8%8B-RocketMQ-%E7%9A%84%E9%A1%BA%E5%BA%8F%E6%B6%88%E6%81%AF/>https://nicksxs.me/2021/08/29/聊一下-RocketMQ-的顺序消息/</a><li class=post-copyright-license><strong>版权声明: </strong>本博客所有文章除特别声明外,均采用 <a href=https://creativecommons.org/licenses/by-nc-sa/4.0/ rel=noopener target=_blank><i class="fab fa-fw fa-creative-commons"></i>BY-NC-SA</a> 许可协议。转载请注明出处!</ul></div><div class=post-tags><a href=/tags/MQ/ rel=tag># MQ</a><a href=/tags/%E6%B6%88%E6%81%AF%E9%98%9F%E5%88%97/ rel=tag># 消息队列</a><a href=/tags/RocketMQ/ rel=tag># RocketMQ</a></div><div class=post-nav><div class=post-nav-item><a href=/2021/08/19/%E8%81%8A%E5%9C%A8%E4%B8%9C%E4%BA%AC%E5%A5%A5%E8%BF%90%E4%BC%9A%E9%97%AD%E5%B9%95%E5%BC%8F%E8%BF%99%E5%A4%A9-%E4%BA%8C/ rel=prev title=聊在东京奥运会闭幕式这天-二><i class="fa fa-angle-left"></i> 聊在东京奥运会闭幕式这天-二</a></div><div class=post-nav-item><a title="聊一下 RocketMQ 的消息存储之 MMAP" href=/2021/09/04/%E8%81%8A%E4%B8%80%E4%B8%8B-RocketMQ-%E7%9A%84%E6%B6%88%E6%81%AF%E5%AD%98%E5%82%A8/ rel=next>聊一下 RocketMQ 的消息存储之 MMAP <i class="fa fa-angle-right"></i></a></div></div></footer></article></div><div class=comments id=disqus_thread><noscript>Please enable JavaScript to view the comments powered by Disqus.</noscript></div></div></main><footer class=footer><div class=footer-inner><div class=beian><a href=https://beian.miit.gov.cn/ rel=noopener target=_blank>浙ICP备16002580号-2 </a><img alt src=/uploads/beian.png><a href=https://beian.mps.gov.cn/#/query/webSearch?code=33010602011094 rel=noopener target=_blank>浙公网安备 33010602011094号</a></div><div class=copyright>© <span itemprop=copyrightYear>2026</span><span class=with-love><i class="fa fa-heart"></i> </span><span class=author itemprop=copyrightHolder>Nicksxs</span></div></div></footer><div class="toggle sidebar-toggle" role=button><span class=toggle-line></span><span class=toggle-line></span><span class=toggle-line></span></div><div class=sidebar-dimmer></div><div aria-label=返回顶部 class=back-to-top role=button><i class="fa fa-arrow-up fa-lg"></i><span>0%</span></div><a aria-label="在 GitHub 上关注我" title="在 GitHub 上关注我" class=github-corner href=https://github.com/nicksxs rel=noopener target=_blank><svg viewbox="0 0 250 250" aria-hidden=true height=80 width=80><path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path><path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" style="transform-origin:130px 106px" class=octo-arm fill=currentColor></path><path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" class=octo-body fill=currentColor></path></svg></a><noscript><div class=noscript-warning>Theme NexT works best with JavaScript enabled</div></noscript><script data-cloudflare-page-counter-config type=application/json>{"enable":true,"endpoint":"https://counter.nicksxs.me","site":"nicksxs","local_cache":true,"timeout":5000,"icon":"far fa-eye","item_text":true}</script><script src=/js/cloudflare-page-counter.js></script><script class=next-config data-name=disqus type=application/json>{"enable":true,"shortname":"nicksxs","count":false,"i18n":{"disqus":"disqus"}}</script><script defer src=/js/third-party/comments/disqus.js></script>
|