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class="tag-list-link" href="/tags/Thread-dump/" rel="tag">Thread dump</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/ThreadLocal/" rel="tag">ThreadLocal</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/ThreadPool/" rel="tag">ThreadPool</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Tomcat/" rel="tag">Tomcat</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Trapping-Rain-Water/" rel="tag">Trapping Rain Water</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/WeakReference/" rel="tag">WeakReference</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Web/" rel="tag">Web</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Webhook/" rel="tag">Webhook</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/WordPress/" rel="tag">WordPress</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/aqs/" rel="tag">aqs</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/await/" rel="tag">await</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/bloom-filter/" rel="tag">bloom filter</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/c/" rel="tag">c++</a><span class="tag-list-count">14</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/cglib/" rel="tag">cglib</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/cgroup/" rel="tag">cgroup</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/cluster/" rel="tag">cluster</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/condition/" rel="tag">condition</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/docker/" rel="tag">docker</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/dp/" rel="tag">dp</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/echo/" rel="tag">echo</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/environment/" rel="tag">environment</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/gap-lock/" rel="tag">gap lock</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/gc/" rel="tag">gc</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/git/" rel="tag">git</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/grep/" rel="tag">grep</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/hadoop/" rel="tag">hadoop</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/icu4c/" rel="tag">icu4c</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/im/" rel="tag">im</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/is-not-null/" rel="tag">is not null</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/is-null/" rel="tag">is null</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/j-u-c/" rel="tag">j.u.c</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/java/" rel="tag">java</a><span class="tag-list-count">25</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/jvm/" rel="tag">jvm</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/leetcode/" rel="tag">leetcode</a><span class="tag-list-count">32</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/leetcode-155/" rel="tag">leetcode 155</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/linked-list/" rel="tag">linked list</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/linux/" rel="tag">linux</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/lock/" rel="tag">lock</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mfc/" rel="tag">mfc</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/min-stack/" rel="tag">min stack</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mq/" rel="tag">mq</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mvcc/" rel="tag">mvcc</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mysql/" rel="tag">mysql</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/namespace/" rel="tag">namespace</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/next-key-lock/" rel="tag">next-key lock</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/nginx/" rel="tag">nginx</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/nullsfirst/" rel="tag">nullsfirst</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/openresty/" rel="tag">openresty</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/php/" rel="tag">php</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/procedure/" rel="tag">procedure</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/python/" rel="tag">python</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/read-view/" rel="tag">read view</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/redis/" rel="tag">redis</a><span class="tag-list-count">11</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/scp/" rel="tag">scp</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/signal/" rel="tag">signal</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/sort/" rel="tag">sort</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/spark/" rel="tag">spark</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/ssh/" rel="tag">ssh</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/stack/" rel="tag">stack</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/stream/" rel="tag">stream</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/string/" rel="tag">string</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/swoole/" rel="tag">swoole</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/top/" rel="tag">top</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/uname/" rel="tag">uname</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/unlock/" rel="tag">unlock</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/utf8/" rel="tag">utf8</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/utf8mb4/" rel="tag">utf8mb4</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/utf8mb4-0900-ai-ci/" rel="tag">utf8mb4_0900_ai_ci</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/utf8mb4-general-ci/" rel="tag">utf8mb4_general_ci</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/utf8mb4-unicode-ci/" rel="tag">utf8mb4_unicode_ci</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/value/" rel="tag">value</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/websocket/" rel="tag">websocket</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/zookeeper/" rel="tag">zookeeper</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/zsh/" rel="tag">zsh</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%89%E9%98%B6%E6%AE%B5%E6%8F%90%E4%BA%A4/" rel="tag">三阶段提交</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%8D%E5%8F%AF%E5%8F%98%E5%BC%95%E7%94%A8/" rel="tag">不可变引用</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%9C%E4%BA%AC%E5%A5%A5%E8%BF%90%E4%BC%9A/" rel="tag">东京奥运会</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%A4%E9%98%B6%E6%AE%B5%E6%8F%90%E4%BA%A4/" rel="tag">两阶段提交</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%AD%E5%B1%B1%E8%B7%AF/" rel="tag">中山路</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%AD%E5%BA%8F/" rel="tag">中序</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%AD%E9%97%B4%E4%BB%B6/" rel="tag">中间件</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%BE%E9%87%8D/" rel="tag">举重</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B9%92%E4%B9%93%E7%90%83/" rel="tag">乒乓球</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BA%8B%E5%8A%A1/" rel="tag">事务</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BA%8C%E5%8F%89%E6%A0%91/" rel="tag">二叉树</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BA%92%E6%96%A5%E9%94%81/" rel="tag">互斥锁</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BB%A3%E7%A0%81%E9%A2%98%E8%A7%A3/" rel="tag">代码题解</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BF%AE%E7%94%B5%E8%84%91%E7%9A%84/" rel="tag">修电脑的</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%81%8F%E5%90%91%E9%94%81/" rel="tag">偏向锁</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%81%A5%E5%BA%B7%E7%A0%81/" rel="tag">健康码</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%85%AC%E4%BA%A4/" rel="tag">公交</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%85%AC%E4%BA%A4%E8%BD%A6/" rel="tag">公交车</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%86%85%E5%AD%98%E5%88%86%E5%B8%83/" rel="tag">内存分布</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/" rel="tag">内存泄漏</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%87%86%E5%A4%87/" rel="tag">准备</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%87%8F%E8%82%A5/" rel="tag">减肥</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%86%E5%B8%83%E5%BC%8F%E4%BA%8B%E5%8A%A1/" rel="tag">分布式事务</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%86%E5%B8%83%E5%BC%8F%E9%94%81/" rel="tag">分布式锁</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%87%E7%89%87/" rel="tag">切片</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%9D%E5%A7%8B%E5%8C%96/" rel="tag">初始化</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%89%8A%E5%B3%B0%E5%A1%AB%E8%B0%B7/" rel="tag">削峰填谷</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%89%8D%E5%BA%8F/" rel="tag">前序</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8A%A0%E5%A1%9E/" rel="tag">加塞</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8A%A0%E8%BD%BD/" rel="tag">加载</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8D%95%E4%BE%8B/" rel="tag">单例</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8D%9A%E5%AE%A2%EF%BC%8C%E6%96%87%E7%AB%A0/" rel="tag">博客，文章</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8E%A6%E9%97%A8/" rel="tag">厦门</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8F%8C%E4%BA%B2%E5%A7%94%E6%B4%BE/" rel="tag">双亲委派</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8F%91%E8%A1%8C%E7%89%88/" rel="tag">发行版</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8F%A3%E7%BD%A9/" rel="tag">口罩</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8F%AF%E5%8F%98%E5%BC%95%E7%94%A8/" rel="tag">可变引用</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%90%90%E6%A7%BD/" rel="tag">吐槽</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%9B%A4%E7%89%A9%E8%B5%84/" rel="tag">囤物资</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6/" rel="tag">垃圾回收</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%9F%BA%E7%A1%80%E8%AE%BE%E6%96%BD/" rel="tag">基础设施</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%A4%A7%E6%89%AB%E9%99%A4/" rel="tag">大扫除</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AD%97%E7%AC%A6%E9%9B%86/" rel="tag">字符集</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AE%89%E5%85%A8/" rel="tag">安全</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AE%B9%E9%94%99%E6%9C%BA%E5%88%B6/" rel="tag">容错机制</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AF%84%E7%94%9F%E8%99%AB/" rel="tag">寄生虫</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B0%84%E5%87%BB/" rel="tag">射击</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B0%8F%E6%8A%80%E5%B7%A7/" rel="tag">小技巧</a><span class="tag-list-count">5</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B1%80%E5%8F%A3%E8%A1%97/" rel="tag">局口街</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B8%83%E9%9A%86%E8%BF%87%E6%BB%A4%E5%99%A8/" rel="tag">布隆过滤器</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B9%B2%E6%B4%BB/" 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的消息存储二</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 title="创建时间：2021-09-12 20:49:18" itemprop="dateCreated datePublished" datetime="2021-09-12T20:49:18+08:00">2021-09-12</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 id="/2021/09/12/%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%E4%BA%8C/" class="post-meta-item leancloud_visitors" data-flag-title="聊一下 RocketMQ 的消息存储二" 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="leancloud-visitors-count"></span> </span><span class="post-meta-item" title="阅读次数" id="busuanzi_container_page_pv"><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 id="busuanzi_value_page_pv"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus：</span> <a title="disqus" href="/2021/09/12/%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%E4%BA%8C/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2021/09/12/聊一下-RocketMQ-的消息存储二/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><h3 id="CommitLog-结构"><a href="#CommitLog-结构" class="headerlink" title="CommitLog 结构"></a>CommitLog 结构</h3><p>CommitLog 是 rocketmq 的服务端，也就是 broker 存储消息的的文件，跟 kafka 一样，也是顺序写入，当然消息是变长的，生成的规则是每个文件的默认1G &#x3D;1024 * 1024 * 1024，commitlog的文件名fileName，名字长度为20位，左边补零，剩余为起始偏移量；比如00000000000000000000代表了第一个文件，起始偏移量为0，文件大小为1G&#x3D;1 073 741 824Byte；当这个文件满了，第二个文件名字为00000000001073741824，起始偏移量为1073741824, 消息存储的时候会顺序写入文件，当文件满了则写入下一个文件，代码中的定义</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// CommitLog file size,default is 1G</span>
<span class="token keyword">private</span> <span class="token keyword">int</span> mapedFileSizeCommitLog <span class="token operator">=</span> <span class="token number">1024</span> <span class="token operator">*</span> <span class="token number">1024</span> <span class="token operator">*</span> <span class="token number">1024</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre><p><img data-src="https://gitee.com/nicksxs/images/raw/master/uPic/kLahwW.png" alt="kLahwW"></p><p>本地跑个 demo 验证下，也是这样，这里奇妙有几个比较巧妙的点（个人观点），首先文件就刚好是 1G，并且按照大小偏移量去生成下一个文件，这样获取消息的时候按大小算一下就知道在哪个文件里了，</p><p>代码中写入 CommitLog 的逻辑可以从这开始看</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">PutMessageResult</span> <span class="token function">putMessage</span><span class="token punctuation">(</span><span class="token keyword">final</span> <span class="token class-name">MessageExtBrokerInner</span> msg<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// Set the storage time</span>
msg<span class="token punctuation">.</span><span class="token function">setStoreTimestamp</span><span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// Set the message body BODY CRC (consider the most appropriate setting</span>
<span class="token comment">// on the client)</span>
msg<span class="token punctuation">.</span><span class="token function">setBodyCRC</span><span class="token punctuation">(</span><span class="token class-name">UtilAll</span><span class="token punctuation">.</span><span class="token function">crc32</span><span class="token punctuation">(</span>msg<span class="token punctuation">.</span><span class="token function">getBody</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// Back to Results</span>
<span class="token class-name">AppendMessageResult</span> result <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token class-name">StoreStatsService</span> storeStatsService <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>defaultMessageStore<span class="token punctuation">.</span><span class="token function">getStoreStatsService</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">String</span> topic <span class="token operator">=</span> msg<span class="token punctuation">.</span><span class="token function">getTopic</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> queueId <span class="token operator">=</span> msg<span class="token punctuation">.</span><span class="token function">getQueueId</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">final</span> <span class="token keyword">int</span> tranType <span class="token operator">=</span> <span class="token class-name">MessageSysFlag</span><span class="token punctuation">.</span><span class="token function">getTransactionValue</span><span class="token punctuation">(</span>msg<span class="token punctuation">.</span><span class="token function">getSysFlag</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>tranType <span class="token operator">==</span> <span class="token class-name">MessageSysFlag</span><span class="token punctuation">.</span>TRANSACTION_NOT_TYPE
<span class="token operator">||</span> tranType <span class="token operator">==</span> <span class="token class-name">MessageSysFlag</span><span class="token punctuation">.</span>TRANSACTION_COMMIT_TYPE<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// Delay Delivery</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>msg<span class="token punctuation">.</span><span class="token function">getDelayTimeLevel</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">></span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>msg<span class="token punctuation">.</span><span class="token function">getDelayTimeLevel</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">></span> <span class="token keyword">this</span><span class="token punctuation">.</span>defaultMessageStore<span class="token punctuation">.</span><span class="token function">getScheduleMessageService</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getMaxDelayLevel</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
msg<span class="token punctuation">.</span><span class="token function">setDelayTimeLevel</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>defaultMessageStore<span class="token punctuation">.</span><span class="token function">getScheduleMessageService</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getMaxDelayLevel</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
topic <span class="token operator">=</span> <span class="token class-name">ScheduleMessageService</span><span class="token punctuation">.</span>SCHEDULE_TOPIC<span class="token punctuation">;</span>
queueId <span class="token operator">=</span> <span class="token class-name">ScheduleMessageService</span><span class="token punctuation">.</span><span class="token function">delayLevel2QueueId</span><span class="token punctuation">(</span>msg<span class="token punctuation">.</span><span class="token function">getDelayTimeLevel</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// Backup real topic, queueId</span>
<span class="token class-name">MessageAccessor</span><span class="token punctuation">.</span><span class="token function">putProperty</span><span class="token punctuation">(</span>msg<span class="token punctuation">,</span> <span class="token class-name">MessageConst</span><span class="token punctuation">.</span>PROPERTY_REAL_TOPIC<span class="token punctuation">,</span> msg<span class="token punctuation">.</span><span class="token function">getTopic</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">MessageAccessor</span><span class="token punctuation">.</span><span class="token function">putProperty</span><span class="token punctuation">(</span>msg<span class="token punctuation">,</span> <span class="token class-name">MessageConst</span><span class="token punctuation">.</span>PROPERTY_REAL_QUEUE_ID<span class="token punctuation">,</span> <span class="token class-name">String</span><span class="token punctuation">.</span><span class="token function">valueOf</span><span class="token punctuation">(</span>msg<span class="token punctuation">.</span><span class="token function">getQueueId</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
msg<span class="token punctuation">.</span><span class="token function">setPropertiesString</span><span class="token punctuation">(</span><span class="token class-name">MessageDecoder</span><span class="token punctuation">.</span><span class="token function">messageProperties2String</span><span class="token punctuation">(</span>msg<span class="token punctuation">.</span><span class="token function">getProperties</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
msg<span class="token punctuation">.</span><span class="token function">setTopic</span><span class="token punctuation">(</span>topic<span class="token punctuation">)</span><span class="token punctuation">;</span>
msg<span class="token punctuation">.</span><span class="token function">setQueueId</span><span class="token punctuation">(</span>queueId<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">long</span> eclipseTimeInLock <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token class-name">MappedFile</span> unlockMappedFile <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token class-name">MappedFile</span> mappedFile <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>mappedFileQueue<span class="token punctuation">.</span><span class="token function">getLastMappedFile</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
putMessageLock<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//spin or ReentrantLock ,depending on store config</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">long</span> beginLockTimestamp <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>defaultMessageStore<span class="token punctuation">.</span><span class="token function">getSystemClock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">now</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>beginTimeInLock <span class="token operator">=</span> beginLockTimestamp<span class="token punctuation">;</span>
<span class="token comment">// Here settings are stored timestamp, in order to ensure an orderly</span>
<span class="token comment">// global</span>
msg<span class="token punctuation">.</span><span class="token function">setStoreTimestamp</span><span class="token punctuation">(</span>beginLockTimestamp<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">null</span> <span class="token operator">==</span> mappedFile <span class="token operator">||</span> mappedFile<span class="token punctuation">.</span><span class="token function">isFull</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
mappedFile <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>mappedFileQueue<span class="token punctuation">.</span><span class="token function">getLastMappedFile</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// Mark: NewFile may be cause noise</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">null</span> <span class="token operator">==</span> mappedFile<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span><span class="token string">"create mapped file1 error, topic: "</span> <span class="token operator">+</span> msg<span class="token punctuation">.</span><span class="token function">getTopic</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">" clientAddr: "</span> <span class="token operator">+</span> msg<span class="token punctuation">.</span><span class="token function">getBornHostString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
beginTimeInLock <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">PutMessageResult</span><span class="token punctuation">(</span><span class="token class-name">PutMessageStatus</span><span class="token punctuation">.</span>CREATE_MAPEDFILE_FAILED<span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
result <span class="token operator">=</span> mappedFile<span class="token punctuation">.</span><span class="token function">appendMessage</span><span class="token punctuation">(</span>msg<span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>appendMessageCallback<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">switch</span> <span class="token punctuation">(</span>result<span class="token punctuation">.</span><span class="token function">getStatus</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">case</span> PUT_OK<span class="token operator">:</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> END_OF_FILE<span class="token operator">:</span>
unlockMappedFile <span class="token operator">=</span> mappedFile<span class="token punctuation">;</span>
<span class="token comment">// Create a new file, re-write the message</span>
mappedFile <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>mappedFileQueue<span class="token punctuation">.</span><span class="token function">getLastMappedFile</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">null</span> <span class="token operator">==</span> mappedFile<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// XXX: warn and notify me</span>
log<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span><span class="token string">"create mapped file2 error, topic: "</span> <span class="token operator">+</span> msg<span class="token punctuation">.</span><span class="token function">getTopic</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">" clientAddr: "</span> <span class="token operator">+</span> msg<span class="token punctuation">.</span><span class="token function">getBornHostString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
beginTimeInLock <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">PutMessageResult</span><span class="token punctuation">(</span><span class="token class-name">PutMessageStatus</span><span class="token punctuation">.</span>CREATE_MAPEDFILE_FAILED<span class="token punctuation">,</span> result<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
result <span class="token operator">=</span> mappedFile<span class="token punctuation">.</span><span class="token function">appendMessage</span><span class="token punctuation">(</span>msg<span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>appendMessageCallback<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> MESSAGE_SIZE_EXCEEDED<span class="token operator">:</span>
<span class="token keyword">case</span> PROPERTIES_SIZE_EXCEEDED<span class="token operator">:</span>
beginTimeInLock <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">PutMessageResult</span><span class="token punctuation">(</span><span class="token class-name">PutMessageStatus</span><span class="token punctuation">.</span>MESSAGE_ILLEGAL<span class="token punctuation">,</span> result<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> UNKNOWN_ERROR<span class="token operator">:</span>
beginTimeInLock <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">PutMessageResult</span><span class="token punctuation">(</span><span class="token class-name">PutMessageStatus</span><span class="token punctuation">.</span>UNKNOWN_ERROR<span class="token punctuation">,</span> result<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">default</span><span class="token operator">:</span>
beginTimeInLock <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">PutMessageResult</span><span class="token punctuation">(</span><span class="token class-name">PutMessageStatus</span><span class="token punctuation">.</span>UNKNOWN_ERROR<span class="token punctuation">,</span> result<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
eclipseTimeInLock <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>defaultMessageStore<span class="token punctuation">.</span><span class="token function">getSystemClock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">now</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">-</span> beginLockTimestamp<span class="token punctuation">;</span>
beginTimeInLock <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">finally</span> <span class="token punctuation">&#123;</span>
putMessageLock<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>eclipseTimeInLock <span class="token operator">></span> <span class="token number">500</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span><span class="token string">"[NOTIFYME]putMessage in lock cost time(ms)=&#123;&#125;, bodyLength=&#123;&#125; AppendMessageResult=&#123;&#125;"</span><span class="token punctuation">,</span> eclipseTimeInLock<span class="token punctuation">,</span> msg<span class="token punctuation">.</span><span class="token function">getBody</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span>length<span class="token punctuation">,</span> result<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">null</span> <span class="token operator">!=</span> unlockMappedFile <span class="token operator">&amp;&amp;</span> <span class="token keyword">this</span><span class="token punctuation">.</span>defaultMessageStore<span class="token punctuation">.</span><span class="token function">getMessageStoreConfig</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">isWarmMapedFileEnable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>defaultMessageStore<span class="token punctuation">.</span><span class="token function">unlockMappedFile</span><span class="token punctuation">(</span>unlockMappedFile<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token class-name">PutMessageResult</span> putMessageResult <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">PutMessageResult</span><span class="token punctuation">(</span><span class="token class-name">PutMessageStatus</span><span class="token punctuation">.</span>PUT_OK<span class="token punctuation">,</span> result<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// Statistics</span>
storeStatsService<span class="token punctuation">.</span><span class="token function">getSinglePutMessageTopicTimesTotal</span><span class="token punctuation">(</span>msg<span class="token punctuation">.</span><span class="token function">getTopic</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">incrementAndGet</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
storeStatsService<span class="token punctuation">.</span><span class="token function">getSinglePutMessageTopicSizeTotal</span><span class="token punctuation">(</span>topic<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">addAndGet</span><span class="token punctuation">(</span>result<span class="token punctuation">.</span><span class="token function">getWroteBytes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">handleDiskFlush</span><span class="token punctuation">(</span>result<span class="token punctuation">,</span> putMessageResult<span class="token punctuation">,</span> msg<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">handleHA</span><span class="token punctuation">(</span>result<span class="token punctuation">,</span> putMessageResult<span class="token punctuation">,</span> msg<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> putMessageResult<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>前面也看到在CommitLog 目录下是有大小为 1G 的文件组成，在实现逻辑中，其实是通过 <code>org.apache.rocketmq.store.MappedFileQueue</code> ，内部是存的一个<code>MappedFile</code>的队列，对于写入的场景每次都是通过<code>org.apache.rocketmq.store.MappedFileQueue#getLastMappedFile()</code> 获取最后一个文件，如果还没有创建，或者最后这个文件已经满了，那就调用 <code>org.apache.rocketmq.store.MappedFileQueue#getLastMappedFile(long)</code></p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">MappedFile</span> <span class="token function">getLastMappedFile</span><span class="token punctuation">(</span><span class="token keyword">final</span> <span class="token keyword">long</span> startOffset<span class="token punctuation">,</span> <span class="token keyword">boolean</span> needCreate<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">long</span> createOffset <span class="token operator">=</span> <span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>
<span class="token comment">// 调用前面的方法，只是从 mappedFileQueue 获取最后一个</span>
<span class="token class-name">MappedFile</span> mappedFileLast <span class="token operator">=</span> <span class="token function">getLastMappedFile</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 如果为空，计算下创建的偏移量</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>mappedFileLast <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
createOffset <span class="token operator">=</span> startOffset <span class="token operator">-</span> <span class="token punctuation">(</span>startOffset <span class="token operator">%</span> <span class="token keyword">this</span><span class="token punctuation">.</span>mappedFileSize<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">// 如果不为空，但是当前的文件写满了</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>mappedFileLast <span class="token operator">!=</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span> mappedFileLast<span class="token punctuation">.</span><span class="token function">isFull</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// 前一个的偏移量加上单个文件的偏移量，也就是 1G</span>
createOffset <span class="token operator">=</span> mappedFileLast<span class="token punctuation">.</span><span class="token function">getFileFromOffset</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token keyword">this</span><span class="token punctuation">.</span>mappedFileSize<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>createOffset <span class="token operator">!=</span> <span class="token operator">-</span><span class="token number">1</span> <span class="token operator">&amp;&amp;</span> needCreate<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// 根据 createOffset 转换成文件名进行创建</span>
<span class="token class-name">String</span> nextFilePath <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>storePath <span class="token operator">+</span> <span class="token class-name">File</span><span class="token punctuation">.</span>separator <span class="token operator">+</span> <span class="token class-name">UtilAll</span><span class="token punctuation">.</span><span class="token function">offset2FileName</span><span class="token punctuation">(</span>createOffset<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">String</span> nextNextFilePath <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>storePath <span class="token operator">+</span> <span class="token class-name">File</span><span class="token punctuation">.</span>separator
<span class="token operator">+</span> <span class="token class-name">UtilAll</span><span class="token punctuation">.</span><span class="token function">offset2FileName</span><span class="token punctuation">(</span>createOffset <span class="token operator">+</span> <span class="token keyword">this</span><span class="token punctuation">.</span>mappedFileSize<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">MappedFile</span> mappedFile <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token comment">// 这里如果allocateMappedFileService 存在，就提交请求</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>allocateMappedFileService <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
mappedFile <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>allocateMappedFileService<span class="token punctuation">.</span><span class="token function">putRequestAndReturnMappedFile</span><span class="token punctuation">(</span>nextFilePath<span class="token punctuation">,</span>
nextNextFilePath<span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>mappedFileSize<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// 否则就直接创建</span>
mappedFile <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">MappedFile</span><span class="token punctuation">(</span>nextFilePath<span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>mappedFileSize<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">IOException</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span><span class="token string">"create mappedFile exception"</span><span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>mappedFile <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>mappedFiles<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
mappedFile<span class="token punctuation">.</span><span class="token function">setFirstCreateInQueue</span><span class="token punctuation">(</span><span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>mappedFiles<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>mappedFile<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">return</span> mappedFile<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">return</span> mappedFileLast<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>首先看下直接创建的，</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">MappedFile</span><span class="token punctuation">(</span><span class="token keyword">final</span> <span class="token class-name">String</span> fileName<span class="token punctuation">,</span> <span class="token keyword">final</span> <span class="token keyword">int</span> fileSize<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">&#123;</span>
<span class="token function">init</span><span class="token punctuation">(</span>fileName<span class="token punctuation">,</span> fileSize<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">init</span><span class="token punctuation">(</span><span class="token keyword">final</span> <span class="token class-name">String</span> fileName<span class="token punctuation">,</span> <span class="token keyword">final</span> <span class="token keyword">int</span> fileSize<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>fileName <span class="token operator">=</span> fileName<span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>fileSize <span class="token operator">=</span> fileSize<span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>file <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">File</span><span class="token punctuation">(</span>fileName<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>fileFromOffset <span class="token operator">=</span> <span class="token class-name">Long</span><span class="token punctuation">.</span><span class="token function">parseLong</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>file<span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">boolean</span> ok <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token function">ensureDirOK</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>file<span class="token punctuation">.</span><span class="token function">getParent</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// 通过 RandomAccessFile 创建 fileChannel</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>fileChannel <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">RandomAccessFile</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>file<span class="token punctuation">,</span> <span class="token string">"rw"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getChannel</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 做 mmap 映射</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>mappedByteBuffer <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>fileChannel<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token class-name">MapMode</span><span class="token punctuation">.</span>READ_WRITE<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> fileSize<span class="token punctuation">)</span><span class="token punctuation">;</span>
TOTAL_MAPPED_VIRTUAL_MEMORY<span class="token punctuation">.</span><span class="token function">addAndGet</span><span class="token punctuation">(</span>fileSize<span class="token punctuation">)</span><span class="token punctuation">;</span>
TOTAL_MAPPED_FILES<span class="token punctuation">.</span><span class="token function">incrementAndGet</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
ok <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">FileNotFoundException</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span><span class="token string">"create file channel "</span> <span class="token operator">+</span> <span class="token keyword">this</span><span class="token punctuation">.</span>fileName <span class="token operator">+</span> <span class="token string">" Failed. "</span><span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">throw</span> e<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">IOException</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span><span class="token string">"map file "</span> <span class="token operator">+</span> <span class="token keyword">this</span><span class="token punctuation">.</span>fileName <span class="token operator">+</span> <span class="token string">" Failed. "</span><span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">throw</span> e<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">finally</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>ok <span class="token operator">&amp;&amp;</span> <span class="token keyword">this</span><span class="token punctuation">.</span>fileChannel <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>fileChannel<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>如果是提交给<code>AllocateMappedFileService</code>的话就用到了一些异步操作</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">MappedFile</span> <span class="token function">putRequestAndReturnMappedFile</span><span class="token punctuation">(</span><span class="token class-name">String</span> nextFilePath<span class="token punctuation">,</span> <span class="token class-name">String</span> nextNextFilePath<span class="token punctuation">,</span> <span class="token keyword">int</span> fileSize<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">int</span> canSubmitRequests <span class="token operator">=</span> <span class="token number">2</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>messageStore<span class="token punctuation">.</span><span class="token function">getMessageStoreConfig</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">isTransientStorePoolEnable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>messageStore<span class="token punctuation">.</span><span class="token function">getMessageStoreConfig</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">isFastFailIfNoBufferInStorePool</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token operator">&amp;&amp;</span> <span class="token class-name">BrokerRole</span><span class="token punctuation">.</span>SLAVE <span class="token operator">!=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>messageStore<span class="token punctuation">.</span><span class="token function">getMessageStoreConfig</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getBrokerRole</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span> <span class="token comment">//if broker is slave, don't fast fail even no buffer in pool</span>
canSubmitRequests <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>messageStore<span class="token punctuation">.</span><span class="token function">getTransientStorePool</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">remainBufferNumbs</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">-</span> <span class="token keyword">this</span><span class="token punctuation">.</span>requestQueue<span class="token punctuation">.</span><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">// 将请求放在 requestTable 中</span>
<span class="token class-name">AllocateRequest</span> nextReq <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">AllocateRequest</span><span class="token punctuation">(</span>nextFilePath<span class="token punctuation">,</span> fileSize<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">boolean</span> nextPutOK <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>requestTable<span class="token punctuation">.</span><span class="token function">putIfAbsent</span><span class="token punctuation">(</span>nextFilePath<span class="token punctuation">,</span> nextReq<span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token comment">// requestTable 使用了 concurrentHashMap，用文件名作为 key，防止并发</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>nextPutOK<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// 这里判断了是否可以提交到 TransientStorePool，涉及读写分离，后面再细聊</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>canSubmitRequests <span class="token operator">&lt;=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span><span class="token string">"[NOTIFYME]TransientStorePool is not enough, so create mapped file error, "</span> <span class="token operator">+</span>
<span class="token string">"RequestQueueSize : &#123;&#125;, StorePoolSize: &#123;&#125;"</span><span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>requestQueue<span class="token punctuation">.</span><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>messageStore<span class="token punctuation">.</span><span class="token function">getTransientStorePool</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">remainBufferNumbs</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>requestTable<span class="token punctuation">.</span><span class="token function">remove</span><span class="token punctuation">(</span>nextFilePath<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">// 塞到阻塞队列中</span>
<span class="token keyword">boolean</span> offerOK <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>requestQueue<span class="token punctuation">.</span><span class="token function">offer</span><span class="token punctuation">(</span>nextReq<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>offerOK<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span><span class="token string">"never expected here, add a request to preallocate queue failed"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
canSubmitRequests<span class="token operator">--</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">// 这里的两个提交我猜测是为了多生成一个 CommitLog，</span>
<span class="token class-name">AllocateRequest</span> nextNextReq <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">AllocateRequest</span><span class="token punctuation">(</span>nextNextFilePath<span class="token punctuation">,</span> fileSize<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">boolean</span> nextNextPutOK <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>requestTable<span class="token punctuation">.</span><span class="token function">putIfAbsent</span><span class="token punctuation">(</span>nextNextFilePath<span class="token punctuation">,</span> nextNextReq<span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>nextNextPutOK<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>canSubmitRequests <span class="token operator">&lt;=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span><span class="token string">"[NOTIFYME]TransientStorePool is not enough, so skip preallocate mapped file, "</span> <span class="token operator">+</span>
<span class="token string">"RequestQueueSize : &#123;&#125;, StorePoolSize: &#123;&#125;"</span><span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>requestQueue<span class="token punctuation">.</span><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>messageStore<span class="token punctuation">.</span><span class="token function">getTransientStorePool</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">remainBufferNumbs</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>requestTable<span class="token punctuation">.</span><span class="token function">remove</span><span class="token punctuation">(</span>nextNextFilePath<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">boolean</span> offerOK <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>requestQueue<span class="token punctuation">.</span><span class="token function">offer</span><span class="token punctuation">(</span>nextNextReq<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>offerOK<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span><span class="token string">"never expected here, add a request to preallocate queue failed"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>hasException<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getServiceName</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">" service has exception. so return null"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token class-name">AllocateRequest</span> result <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>requestTable<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>nextFilePath<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// 这里就异步等着</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>result <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">boolean</span> waitOK <span class="token operator">=</span> result<span class="token punctuation">.</span><span class="token function">getCountDownLatch</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">await</span><span class="token punctuation">(</span>waitTimeOut<span class="token punctuation">,</span> <span class="token class-name">TimeUnit</span><span class="token punctuation">.</span>MILLISECONDS<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>waitOK<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span><span class="token string">"create mmap timeout "</span> <span class="token operator">+</span> result<span class="token punctuation">.</span><span class="token function">getFilePath</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">" "</span> <span class="token operator">+</span> result<span class="token punctuation">.</span><span class="token function">getFileSize</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>requestTable<span class="token punctuation">.</span><span class="token function">remove</span><span class="token punctuation">(</span>nextFilePath<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> result<span class="token punctuation">.</span><span class="token function">getMappedFile</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span><span class="token string">"find preallocate mmap failed, this never happen"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getServiceName</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">" service has exception. "</span><span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>而真正去执行文件操作的就是 <code>AllocateMappedFileService</code>的 run 方法</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">info</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getServiceName</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">" service started"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">isStopped</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">mmapOperation</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token punctuation">&#125;</span>
log<span class="token punctuation">.</span><span class="token function">info</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getServiceName</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">" service end"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">private</span> <span class="token keyword">boolean</span> <span class="token function">mmapOperation</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">boolean</span> isSuccess <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token class-name">AllocateRequest</span> req <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// 从阻塞队列里获取请求</span>
req <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>requestQueue<span class="token punctuation">.</span><span class="token function">take</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">AllocateRequest</span> expectedRequest <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>requestTable<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>req<span class="token punctuation">.</span><span class="token function">getFilePath</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">null</span> <span class="token operator">==</span> expectedRequest<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span><span class="token string">"this mmap request expired, maybe cause timeout "</span> <span class="token operator">+</span> req<span class="token punctuation">.</span><span class="token function">getFilePath</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">" "</span>
<span class="token operator">+</span> req<span class="token punctuation">.</span><span class="token function">getFileSize</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>expectedRequest <span class="token operator">!=</span> req<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span><span class="token string">"never expected here, maybe cause timeout "</span> <span class="token operator">+</span> req<span class="token punctuation">.</span><span class="token function">getFilePath</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">" "</span>
<span class="token operator">+</span> req<span class="token punctuation">.</span><span class="token function">getFileSize</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">", req:"</span> <span class="token operator">+</span> req <span class="token operator">+</span> <span class="token string">", expectedRequest:"</span> <span class="token operator">+</span> expectedRequest<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>req<span class="token punctuation">.</span><span class="token function">getMappedFile</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">long</span> beginTime <span class="token operator">=</span> <span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">MappedFile</span> mappedFile<span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>messageStore<span class="token punctuation">.</span><span class="token function">getMessageStoreConfig</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">isTransientStorePoolEnable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// 通过 transientStorePool 创建</span>
mappedFile <span class="token operator">=</span> <span class="token class-name">ServiceLoader</span><span class="token punctuation">.</span><span class="token function">load</span><span class="token punctuation">(</span><span class="token class-name">MappedFile</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">iterator</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
mappedFile<span class="token punctuation">.</span><span class="token function">init</span><span class="token punctuation">(</span>req<span class="token punctuation">.</span><span class="token function">getFilePath</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> req<span class="token punctuation">.</span><span class="token function">getFileSize</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> messageStore<span class="token punctuation">.</span><span class="token function">getTransientStorePool</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">RuntimeException</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span><span class="token string">"Use default implementation."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 默认创建</span>
mappedFile <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">MappedFile</span><span class="token punctuation">(</span>req<span class="token punctuation">.</span><span class="token function">getFilePath</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> req<span class="token punctuation">.</span><span class="token function">getFileSize</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> messageStore<span class="token punctuation">.</span><span class="token function">getTransientStorePool</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// 默认创建</span>
mappedFile <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">MappedFile</span><span class="token punctuation">(</span>req<span class="token punctuation">.</span><span class="token function">getFilePath</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> req<span class="token punctuation">.</span><span class="token function">getFileSize</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">long</span> eclipseTime <span class="token operator">=</span> <span class="token class-name">UtilAll</span><span class="token punctuation">.</span><span class="token function">computeEclipseTimeMilliseconds</span><span class="token punctuation">(</span>beginTime<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>eclipseTime <span class="token operator">></span> <span class="token number">10</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">int</span> queueSize <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>requestQueue<span class="token punctuation">.</span><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span><span class="token string">"create mappedFile spent time(ms) "</span> <span class="token operator">+</span> eclipseTime <span class="token operator">+</span> <span class="token string">" queue size "</span> <span class="token operator">+</span> queueSize
<span class="token operator">+</span> <span class="token string">" "</span> <span class="token operator">+</span> req<span class="token punctuation">.</span><span class="token function">getFilePath</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">" "</span> <span class="token operator">+</span> req<span class="token punctuation">.</span><span class="token function">getFileSize</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">// pre write mappedFile</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>mappedFile<span class="token punctuation">.</span><span class="token function">getFileSize</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">>=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>messageStore<span class="token punctuation">.</span><span class="token function">getMessageStoreConfig</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">getMapedFileSizeCommitLog</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token operator">&amp;&amp;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>messageStore<span class="token punctuation">.</span><span class="token function">getMessageStoreConfig</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">isWarmMapedFileEnable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
mappedFile<span class="token punctuation">.</span><span class="token function">warmMappedFile</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>messageStore<span class="token punctuation">.</span><span class="token function">getMessageStoreConfig</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getFlushDiskType</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>messageStore<span class="token punctuation">.</span><span class="token function">getMessageStoreConfig</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getFlushLeastPagesWhenWarmMapedFile</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
req<span class="token punctuation">.</span><span class="token function">setMappedFile</span><span class="token punctuation">(</span>mappedFile<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>hasException <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
isSuccess <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getServiceName</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">" interrupted, possibly by shutdown."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>hasException <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">IOException</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getServiceName</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">" service has exception. "</span><span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>hasException <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">null</span> <span class="token operator">!=</span> req<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
requestQueue<span class="token punctuation">.</span><span class="token function">offer</span><span class="token punctuation">(</span>req<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> ignored<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span> <span class="token keyword">finally</span> <span class="token punctuation">&#123;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>req <span class="token operator">!=</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span> isSuccess<span class="token punctuation">)</span>
<span class="token comment">// 通知前面等待的</span>
req<span class="token punctuation">.</span><span class="token function">getCountDownLatch</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">countDown</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre></div><footer class="post-footer"><div class="reward-container"><div>Buy me a coffee</div><button>赞赏</button><div class="post-reward"><div><img src="https://i.loli.net/2020/01/12/NUlWanT31E8LQGx.png" alt="Nicksxs 微信"> <span>微信</span></div><div><img src="https://ooo.0o0.ooo/2016/08/17/57b421e773057.jpg" alt="Nicksxs 支付宝"> <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><li class="post-copyright-link"><strong>本文链接：</strong> <a href="https://nicksxs.me/2021/09/12/%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%E4%BA%8C/" title="聊一下 RocketMQ 的消息存储二">https://nicksxs.me/2021/09/12/聊一下-RocketMQ-的消息存储二/</a></li><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！</li></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="/2021/09/04/%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="prev" title="聊一下 RocketMQ 的消息存储之 MMAP"><i class="fa fa-chevron-left"></i> 聊一下 RocketMQ 的消息存储之 MMAP</a></div><div class="post-nav-item"><a href="/2021/09/19/%E8%81%8A%E4%B8%80%E4%B8%8B-SpringBoot-%E4%B8%AD%E4%BD%BF%E7%94%A8%E7%9A%84-cglib-%E4%BD%9C%E4%B8%BA%E5%8A%A8%E6%80%81%E4%BB%A3%E7%90%86%E4%B8%AD%E7%9A%84%E4%B8%80%E4%B8%AA%E6%B3%A8%E6%84%8F%E7%82%B9/" rel="next" title="聊一下 SpringBoot 中使用的 cglib 作为动态代理中的一个注意点">聊一下 SpringBoot 中使用的 cglib 作为动态代理中的一个注意点 <i class="fa fa-chevron-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="copyright">&copy; 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