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聊聊 RocketMQ 的 Broker 源码
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<p>broker 的启动形式有点类似于 NameServer，都是服务类型的，跟 Consumer 差别比较大，</p>
<p>首先是org.apache.rocketmq.broker.BrokerStartup中的 main 函数，org.apache.rocketmq.broker.BrokerStartup#createBrokerController基本就是读取参数，这里差点把最核心的初始化给漏了，</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">final</span> BrokerController controller = <span class="keyword">new</span> BrokerController(</span><br><span class="line"> brokerConfig,</span><br><span class="line"> nettyServerConfig,</span><br><span class="line"> nettyClientConfig,</span><br><span class="line"> messageStoreConfig);</span><br><span class="line"> <span class="comment">// remember all configs to prevent discard</span></span><br><span class="line"> controller.getConfiguration().registerConfig(properties);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">boolean</span> initResult = controller.initialize();</span><br></pre></td></tr></table></figure>
<p>前面是以 broker 配置，netty 的服务端和客户端配置，以及消息存储配置在实例化 BrokerController，然后就是初始化了</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">initialize</span><span class="params">()</span> <span class="keyword">throws</span> CloneNotSupportedException </span>&#123;</span><br><span class="line"> <span class="keyword">boolean</span> result = <span class="keyword">this</span>.topicConfigManager.load();</span><br><span class="line"></span><br><span class="line"> result = result &amp;&amp; <span class="keyword">this</span>.consumerOffsetManager.load();</span><br><span class="line"> result = result &amp;&amp; <span class="keyword">this</span>.subscriptionGroupManager.load();</span><br><span class="line"> result = result &amp;&amp; <span class="keyword">this</span>.consumerFilterManager.load();</span><br></pre></td></tr></table></figure>
<p>前面这些就是各个配置的 load 了，然后是个我认为比较重要的部分messageStore 的实例化，</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">if</span> (result) &#123;</span><br><span class="line"> <span class="keyword">try</span> &#123;</span><br><span class="line"> <span class="keyword">this</span>.messageStore =</span><br><span class="line"> <span class="keyword">new</span> DefaultMessageStore(<span class="keyword">this</span>.messageStoreConfig, <span class="keyword">this</span>.brokerStatsManager, <span class="keyword">this</span>.messageArrivingListener,</span><br><span class="line"> <span class="keyword">this</span>.brokerConfig);</span><br><span class="line"> <span class="keyword">if</span> (messageStoreConfig.isEnableDLegerCommitLog()) &#123;</span><br><span class="line"> DLedgerRoleChangeHandler roleChangeHandler = <span class="keyword">new</span> DLedgerRoleChangeHandler(<span class="keyword">this</span>, (DefaultMessageStore) messageStore);</span><br><span class="line"> ((DLedgerCommitLog)((DefaultMessageStore) messageStore).getCommitLog()).getdLedgerServer().getdLedgerLeaderElector().addRoleChangeHandler(roleChangeHandler);</span><br><span class="line"> &#125;</span><br><span class="line"> <span class="keyword">this</span>.brokerStats = <span class="keyword">new</span> BrokerStats((DefaultMessageStore) <span class="keyword">this</span>.messageStore);</span><br><span class="line"> <span class="comment">//load plugin</span></span><br><span class="line"> MessageStorePluginContext context = <span class="keyword">new</span> MessageStorePluginContext(messageStoreConfig, brokerStatsManager, messageArrivingListener, brokerConfig);</span><br><span class="line"> <span class="keyword">this</span>.messageStore = MessageStoreFactory.build(context, <span class="keyword">this</span>.messageStore);</span><br><span class="line"> <span class="keyword">this</span>.messageStore.getDispatcherList().addFirst(<span class="keyword">new</span> CommitLogDispatcherCalcBitMap(<span class="keyword">this</span>.brokerConfig, <span class="keyword">this</span>.consumerFilterManager));</span><br><span class="line"> &#125; <span class="keyword">catch</span> (IOException e) &#123;</span><br><span class="line"> result = <span class="keyword">false</span>;</span><br><span class="line"> log.error(<span class="string">"Failed to initialize"</span>, e);</span><br><span class="line"> &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">result = result &amp;&amp; <span class="keyword">this</span>.messageStore.load();</span><br></pre></td></tr></table></figure>
<p>先是实例化，实例化构造函数里的代码比较重要，重点看一下</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="title">DefaultMessageStore</span><span class="params">(<span class="keyword">final</span> MessageStoreConfig messageStoreConfig, <span class="keyword">final</span> BrokerStatsManager brokerStatsManager,</span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">final</span> MessageArrivingListener messageArrivingListener, <span class="keyword">final</span> BrokerConfig brokerConfig)</span> <span class="keyword">throws</span> IOException </span>&#123;</span><br><span class="line"> <span class="keyword">this</span>.messageArrivingListener = messageArrivingListener;</span><br><span class="line"> <span class="keyword">this</span>.brokerConfig = brokerConfig;</span><br><span class="line"> <span class="keyword">this</span>.messageStoreConfig = messageStoreConfig;</span><br><span class="line"> <span class="keyword">this</span>.brokerStatsManager = brokerStatsManager;</span><br><span class="line"> <span class="keyword">this</span>.allocateMappedFileService = <span class="keyword">new</span> AllocateMappedFileService(<span class="keyword">this</span>);</span><br><span class="line"> <span class="keyword">if</span> (messageStoreConfig.isEnableDLegerCommitLog()) &#123;</span><br><span class="line"> <span class="keyword">this</span>.commitLog = <span class="keyword">new</span> DLedgerCommitLog(<span class="keyword">this</span>);</span><br><span class="line"> &#125; <span class="keyword">else</span> &#123;</span><br><span class="line"> <span class="keyword">this</span>.commitLog = <span class="keyword">new</span> CommitLog(<span class="keyword">this</span>);</span><br><span class="line"> &#125;</span><br><span class="line"> <span class="keyword">this</span>.consumeQueueTable = <span class="keyword">new</span> ConcurrentHashMap&lt;&gt;(<span class="number">32</span>);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.flushConsumeQueueService = <span class="keyword">new</span> FlushConsumeQueueService();</span><br><span class="line"> <span class="keyword">this</span>.cleanCommitLogService = <span class="keyword">new</span> CleanCommitLogService();</span><br><span class="line"> <span class="keyword">this</span>.cleanConsumeQueueService = <span class="keyword">new</span> CleanConsumeQueueService();</span><br><span class="line"> <span class="keyword">this</span>.storeStatsService = <span class="keyword">new</span> StoreStatsService();</span><br><span class="line"> <span class="keyword">this</span>.indexService = <span class="keyword">new</span> IndexService(<span class="keyword">this</span>);</span><br><span class="line"> <span class="keyword">if</span> (!messageStoreConfig.isEnableDLegerCommitLog()) &#123;</span><br><span class="line"> <span class="keyword">this</span>.haService = <span class="keyword">new</span> HAService(<span class="keyword">this</span>);</span><br><span class="line"> &#125; <span class="keyword">else</span> &#123;</span><br><span class="line"> <span class="keyword">this</span>.haService = <span class="keyword">null</span>;</span><br><span class="line"> &#125;</span><br><span class="line"> <span class="keyword">this</span>.reputMessageService = <span class="keyword">new</span> ReputMessageService();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.scheduleMessageService = <span class="keyword">new</span> ScheduleMessageService(<span class="keyword">this</span>);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.transientStorePool = <span class="keyword">new</span> TransientStorePool(messageStoreConfig);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (messageStoreConfig.isTransientStorePoolEnable()) &#123;</span><br><span class="line"> <span class="keyword">this</span>.transientStorePool.init();</span><br><span class="line"> &#125;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.allocateMappedFileService.start();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.indexService.start();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.dispatcherList = <span class="keyword">new</span> LinkedList&lt;&gt;();</span><br><span class="line"> <span class="keyword">this</span>.dispatcherList.addLast(<span class="keyword">new</span> CommitLogDispatcherBuildConsumeQueue());</span><br><span class="line"> <span class="keyword">this</span>.dispatcherList.addLast(<span class="keyword">new</span> CommitLogDispatcherBuildIndex());</span><br><span class="line"></span><br><span class="line"> File file = <span class="keyword">new</span> File(StorePathConfigHelper.getLockFile(messageStoreConfig.getStorePathRootDir()));</span><br><span class="line"> MappedFile.ensureDirOK(file.getParent());</span><br><span class="line"> lockFile = <span class="keyword">new</span> RandomAccessFile(file, <span class="string">"rw"</span>);</span><br><span class="line"> &#125;</span><br></pre></td></tr></table></figure>
<p>这里面有很多类，不过先把从构造函数里传进来的忽略下，接下来就是 <code>AllocateMappedFileService</code> 这个service，前面看过文章的可能会根据上面的代码猜到，这也是个 ServiceThread，如果是对RocketMQ 有所了解的可能从名字可以看出这个类是关于 RocketMQ 消息怎么落盘的，当需要创建MappedFile时（在MapedFileQueue.getLastMapedFile方法中），向该线程的requestQueue队列中放入AllocateRequest请求对象，该线程会在后台监听该队列，并在后台创建MapedFile对象，即同时创建了物理文件。然后是创建了 IndexService 服务线程，用来给创建索引；还有是FlushConsumeQueueService是将ConsumeQueue 刷入磁盘；CleanCommitLogService用来清理过期的 CommitLog，默认是 72 小时以上；CleanConsumeQueueService是将小于最新的 CommitLog 偏移量的 ConsumeQueue 清理掉；StoreStatsService是储存统计服务；HAService用于CommitLog 的主备同步；ScheduleMessageService用于定时消息；还有就是这个ReputMessageService非常重要，就是由它实现了将 CommitLog 以 topic+queue 纬度构建 ConsumeQueue，后面TransientStorePool是异步刷盘时的存储buffer，也可以从后面的判断中看出来</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">isTransientStorePoolEnable</span><span class="params">()</span> </span>&#123;</span><br><span class="line"> <span class="keyword">return</span> transientStorePoolEnable &amp;&amp; FlushDiskType.ASYNC_FLUSH == getFlushDiskType()</span><br><span class="line"> &amp;&amp; BrokerRole.SLAVE != getBrokerRole();</span><br><span class="line"> &#125;</span><br></pre></td></tr></table></figure>
<p>再然后就是启动两个服务线程，dispatcherList是为CommitLog文件转发请求，差不多这个初始化就这些内容。</p>
<p>然后回到外层，下面是主备切换的配置，然后是数据统计，接着是存储插件加载，然后是往转发器链表里再加一个过滤器</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">if</span> (messageStoreConfig.isEnableDLegerCommitLog()) &#123;</span><br><span class="line"> DLedgerRoleChangeHandler roleChangeHandler = <span class="keyword">new</span> DLedgerRoleChangeHandler(<span class="keyword">this</span>, (DefaultMessageStore) messageStore);</span><br><span class="line"> ((DLedgerCommitLog)((DefaultMessageStore) messageStore).getCommitLog()).getdLedgerServer().getdLedgerLeaderElector().addRoleChangeHandler(roleChangeHandler);</span><br><span class="line"> &#125;</span><br><span class="line"> <span class="keyword">this</span>.brokerStats = <span class="keyword">new</span> BrokerStats((DefaultMessageStore) <span class="keyword">this</span>.messageStore);</span><br><span class="line"> <span class="comment">//load plugin</span></span><br><span class="line"> MessageStorePluginContext context = <span class="keyword">new</span> MessageStorePluginContext(messageStoreConfig, brokerStatsManager, messageArrivingListener, brokerConfig);</span><br><span class="line"> <span class="keyword">this</span>.messageStore = MessageStoreFactory.build(context, <span class="keyword">this</span>.messageStore);</span><br><span class="line"> <span class="keyword">this</span>.messageStore.getDispatcherList().addFirst(<span class="keyword">new</span> CommitLogDispatcherCalcBitMap(<span class="keyword">this</span>.brokerConfig, <span class="keyword">this</span>.consumerFilterManager));</span><br></pre></td></tr></table></figure>
<p>接下来就是org.apache.rocketmq.store.MessageStore#load的过程了，</p>
<p>1) 调用ScheduleMessageService.load方法，初始化延迟级别列表。将这些级别（”1s 5s 10s 30s 1m 2m 3m 4m 5m 6m 7m 8m 9m 10m 20m 30m 1h 2h”）的延时存入延迟级别delayLevelTable：ConcurrentHashMap&lt;Integer /* level <em>/, Long/</em> delay timeMillis */&gt;变量中，例如1s的kv值为1:1000,5s的kv值为2:5000，key值依次类推；每个延迟级别即为一个队列。</p>
<p>2)调用CommitLog.load方法，在此方法中调用MapedFileQueue.load方法，将$HOME /store/commitlog目录下的所有文件加载到MapedFileQueue的List<MapedFile>变量中；</p>
<p>3)调用DefaultMessageStore.loadConsumeQueue方法加载consumequeue文件数据到DefaultMessageStore.consumeQueueTable集合中。</p>
<p>初始化StoreCheckPoint对象，加载$HOME/store/checkpoint文件，该文件记录三个字段值，分别是物理队列消息时间戳、逻辑队列消息时间戳、索引队列消息时间戳。</p>
<p>调用IndexService.load方法加载$HOME/store/index目录下的文件。对该目录下的每个文件初始化一个IndexFile对象。然后调用IndexFile对象的load方法将IndexHeader加载到对象的变量中；再根据检查是否存在abort文件，若有存在abort文件，则表示Broker表示上次是异常退出的，则检查checkpoint的indexMsgTimestamp字段值是否小于IndexHeader的endTimestamp值，indexMsgTimestamp值表示最后刷盘的时间，若小于则表示在最后刷盘之后在该文件中还创建了索引，则要删除该Index文件，否则将该IndexFile对象放入indexFileList:ArrayList<IndexFile>索引文件集合中。</p>
<p>然后调用org.apache.rocketmq.store.DefaultMessageStore#recover恢复，前面有根据<code>boolean lastExitOK = !this.isTempFileExist();</code>临时文件是否存在来判断上一次是否正常退出，根据这个状态来选择什么恢复策略</p>
<p>接下去是初始化 Netty 服务端，初始化发送消息线程池（sendMessageExecutor）、拉取消息线程池（pullMessageExecutor）、管理Broker线程池（adminBrokerExecutor）、客户端管理线程池（clientManageExecutor），注册事件处理器，包括发送消息事件处理器（SendMessageProcessor）、拉取消息事件处理器、查询消息事件处理器（QueryMessageProcessor，包括客户端的心跳事件、注销事件、获取消费者列表事件、更新更新和查询消费进度consumerOffset）、客户端管理事件处理器（ClientManageProcessor）、结束事务处理器（EndTransactionProcessor）、默认事件处理器（AdminBrokerProcessor），然后是定时任务</p>
<p><code>BrokerController.this.getBrokerStats().record();</code> 记录 Broker 状态</p>
<p><code>BrokerController.this.consumerOffsetManager.persist();</code> 持久化consumerOffset</p>
<p><code>BrokerController.this.consumerFilterManager.persist();</code>持久化consumerFilter</p>
<p><code>BrokerController.this.protectBroker();</code> 保护 broker，消费慢，不让继续投递</p>
<p><code>BrokerController.this.printWaterMark();</code> 打印水位</p>
<p><code>log.info(&quot;dispatch behind commit log {} bytes&quot;, BrokerController.this.getMessageStore().dispatchBehindBytes());</code> 检查落后程度</p>
<p><code>BrokerController.this.brokerOuterAPI.fetchNameServerAddr();</code> 定时获取 nameserver</p>
<p><code>BrokerController.this.printMasterAndSlaveDiff();</code> 打印主从不一致</p>
<p>然后是 tsl，初始化事务消息，初始化 RPCHook</p>
<p>请把害怕打到公屏上🤦‍♂️，从线程池名字和调用的方法应该可以看出大部分的用途</p>
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class="line">182</span><br><span class="line">183</span><br><span class="line">184</span><br><span class="line">185</span><br><span class="line">186</span><br><span class="line">187</span><br><span class="line">188</span><br><span class="line">189</span><br><span class="line">190</span><br><span class="line">191</span><br><span class="line">192</span><br><span class="line">193</span><br><span class="line">194</span><br><span class="line">195</span><br><span class="line">196</span><br><span class="line">197</span><br><span class="line">198</span><br><span class="line">199</span><br><span class="line">200</span><br><span class="line">201</span><br><span class="line">202</span><br><span class="line">203</span><br><span class="line">204</span><br><span class="line">205</span><br><span class="line">206</span><br><span class="line">207</span><br><span class="line">208</span><br><span class="line">209</span><br><span class="line">210</span><br><span class="line">211</span><br><span class="line">212</span><br><span class="line">213</span><br><span class="line">214</span><br><span class="line">215</span><br><span class="line">216</span><br><span class="line">217</span><br><span class="line">218</span><br><span class="line">219</span><br><span class="line">220</span><br><span class="line">221</span><br><span class="line">222</span><br><span class="line">223</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">this</span>.remotingServer = <span class="keyword">new</span> NettyRemotingServer(<span class="keyword">this</span>.nettyServerConfig, <span class="keyword">this</span>.clientHousekeepingService);</span><br><span class="line"> NettyServerConfig fastConfig = (NettyServerConfig) <span class="keyword">this</span>.nettyServerConfig.clone();</span><br><span class="line"> fastConfig.setListenPort(nettyServerConfig.getListenPort() - <span class="number">2</span>);</span><br><span class="line"> <span class="keyword">this</span>.fastRemotingServer = <span class="keyword">new</span> NettyRemotingServer(fastConfig, <span class="keyword">this</span>.clientHousekeepingService);</span><br><span class="line"> <span class="keyword">this</span>.sendMessageExecutor = <span class="keyword">new</span> BrokerFixedThreadPoolExecutor(</span><br><span class="line"> <span class="keyword">this</span>.brokerConfig.getSendMessageThreadPoolNums(),</span><br><span class="line"> <span class="keyword">this</span>.brokerConfig.getSendMessageThreadPoolNums(),</span><br><span class="line"> <span class="number">1000</span> * <span class="number">60</span>,</span><br><span class="line"> TimeUnit.MILLISECONDS,</span><br><span class="line"> <span class="keyword">this</span>.sendThreadPoolQueue,</span><br><span class="line"> <span class="keyword">new</span> ThreadFactoryImpl(<span class="string">"SendMessageThread_"</span>));</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.pullMessageExecutor = <span class="keyword">new</span> BrokerFixedThreadPoolExecutor(</span><br><span class="line"> <span class="keyword">this</span>.brokerConfig.getPullMessageThreadPoolNums(),</span><br><span class="line"> <span class="keyword">this</span>.brokerConfig.getPullMessageThreadPoolNums(),</span><br><span class="line"> <span class="number">1000</span> * <span class="number">60</span>,</span><br><span class="line"> TimeUnit.MILLISECONDS,</span><br><span class="line"> <span class="keyword">this</span>.pullThreadPoolQueue,</span><br><span class="line"> <span class="keyword">new</span> ThreadFactoryImpl(<span class="string">"PullMessageThread_"</span>));</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.replyMessageExecutor = <span class="keyword">new</span> BrokerFixedThreadPoolExecutor(</span><br><span class="line"> <span class="keyword">this</span>.brokerConfig.getProcessReplyMessageThreadPoolNums(),</span><br><span class="line"> <span class="keyword">this</span>.brokerConfig.getProcessReplyMessageThreadPoolNums(),</span><br><span class="line"> <span class="number">1000</span> * <span class="number">60</span>,</span><br><span class="line"> TimeUnit.MILLISECONDS,</span><br><span class="line"> <span class="keyword">this</span>.replyThreadPoolQueue,</span><br><span class="line"> <span class="keyword">new</span> ThreadFactoryImpl(<span class="string">"ProcessReplyMessageThread_"</span>));</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.queryMessageExecutor = <span class="keyword">new</span> BrokerFixedThreadPoolExecutor(</span><br><span class="line"> <span class="keyword">this</span>.brokerConfig.getQueryMessageThreadPoolNums(),</span><br><span class="line"> <span class="keyword">this</span>.brokerConfig.getQueryMessageThreadPoolNums(),</span><br><span class="line"> <span class="number">1000</span> * <span class="number">60</span>,</span><br><span class="line"> TimeUnit.MILLISECONDS,</span><br><span class="line"> <span class="keyword">this</span>.queryThreadPoolQueue,</span><br><span class="line"> <span class="keyword">new</span> ThreadFactoryImpl(<span class="string">"QueryMessageThread_"</span>));</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.adminBrokerExecutor =</span><br><span class="line"> Executors.newFixedThreadPool(<span class="keyword">this</span>.brokerConfig.getAdminBrokerThreadPoolNums(), <span class="keyword">new</span> ThreadFactoryImpl(</span><br><span class="line"> <span class="string">"AdminBrokerThread_"</span>));</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.clientManageExecutor = <span class="keyword">new</span> ThreadPoolExecutor(</span><br><span class="line"> <span class="keyword">this</span>.brokerConfig.getClientManageThreadPoolNums(),</span><br><span class="line"> <span class="keyword">this</span>.brokerConfig.getClientManageThreadPoolNums(),</span><br><span class="line"> <span class="number">1000</span> * <span class="number">60</span>,</span><br><span class="line"> TimeUnit.MILLISECONDS,</span><br><span class="line"> <span class="keyword">this</span>.clientManagerThreadPoolQueue,</span><br><span class="line"> <span class="keyword">new</span> ThreadFactoryImpl(<span class="string">"ClientManageThread_"</span>));</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.heartbeatExecutor = <span class="keyword">new</span> BrokerFixedThreadPoolExecutor(</span><br><span class="line"> <span class="keyword">this</span>.brokerConfig.getHeartbeatThreadPoolNums(),</span><br><span class="line"> <span class="keyword">this</span>.brokerConfig.getHeartbeatThreadPoolNums(),</span><br><span class="line"> <span class="number">1000</span> * <span class="number">60</span>,</span><br><span class="line"> TimeUnit.MILLISECONDS,</span><br><span class="line"> <span class="keyword">this</span>.heartbeatThreadPoolQueue,</span><br><span class="line"> <span class="keyword">new</span> ThreadFactoryImpl(<span class="string">"HeartbeatThread_"</span>, <span class="keyword">true</span>));</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.endTransactionExecutor = <span class="keyword">new</span> BrokerFixedThreadPoolExecutor(</span><br><span class="line"> <span class="keyword">this</span>.brokerConfig.getEndTransactionThreadPoolNums(),</span><br><span class="line"> <span class="keyword">this</span>.brokerConfig.getEndTransactionThreadPoolNums(),</span><br><span class="line"> <span class="number">1000</span> * <span class="number">60</span>,</span><br><span class="line"> TimeUnit.MILLISECONDS,</span><br><span class="line"> <span class="keyword">this</span>.endTransactionThreadPoolQueue,</span><br><span class="line"> <span class="keyword">new</span> ThreadFactoryImpl(<span class="string">"EndTransactionThread_"</span>));</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.consumerManageExecutor =</span><br><span class="line"> Executors.newFixedThreadPool(<span class="keyword">this</span>.brokerConfig.getConsumerManageThreadPoolNums(), <span class="keyword">new</span> ThreadFactoryImpl(</span><br><span class="line"> <span class="string">"ConsumerManageThread_"</span>));</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.registerProcessor();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">final</span> <span class="keyword">long</span> initialDelay = UtilAll.computeNextMorningTimeMillis() - System.currentTimeMillis();</span><br><span class="line"> <span class="keyword">final</span> <span class="keyword">long</span> period = <span class="number">1000</span> * <span class="number">60</span> * <span class="number">60</span> * <span class="number">24</span>;</span><br><span class="line"> <span class="keyword">this</span>.scheduledExecutorService.scheduleAtFixedRate(<span class="keyword">new</span> Runnable() &#123;</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>&#123;</span><br><span class="line"> <span class="keyword">try</span> &#123;</span><br><span class="line"> BrokerController.<span class="keyword">this</span>.getBrokerStats().record();</span><br><span class="line"> &#125; <span class="keyword">catch</span> (Throwable e) &#123;</span><br><span class="line"> log.error(<span class="string">"schedule record error."</span>, e);</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;, initialDelay, period, TimeUnit.MILLISECONDS);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.scheduledExecutorService.scheduleAtFixedRate(<span class="keyword">new</span> Runnable() &#123;</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>&#123;</span><br><span class="line"> <span class="keyword">try</span> &#123;</span><br><span class="line"> BrokerController.<span class="keyword">this</span>.consumerOffsetManager.persist();</span><br><span class="line"> &#125; <span class="keyword">catch</span> (Throwable e) &#123;</span><br><span class="line"> log.error(<span class="string">"schedule persist consumerOffset error."</span>, e);</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;, <span class="number">1000</span> * <span class="number">10</span>, <span class="keyword">this</span>.brokerConfig.getFlushConsumerOffsetInterval(), TimeUnit.MILLISECONDS);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.scheduledExecutorService.scheduleAtFixedRate(<span class="keyword">new</span> Runnable() &#123;</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>&#123;</span><br><span class="line"> <span class="keyword">try</span> &#123;</span><br><span class="line"> BrokerController.<span class="keyword">this</span>.consumerFilterManager.persist();</span><br><span class="line"> &#125; <span class="keyword">catch</span> (Throwable e) &#123;</span><br><span class="line"> log.error(<span class="string">"schedule persist consumer filter error."</span>, e);</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;, <span class="number">1000</span> * <span class="number">10</span>, <span class="number">1000</span> * <span class="number">10</span>, TimeUnit.MILLISECONDS);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.scheduledExecutorService.scheduleAtFixedRate(<span class="keyword">new</span> Runnable() &#123;</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>&#123;</span><br><span class="line"> <span class="keyword">try</span> &#123;</span><br><span class="line"> BrokerController.<span class="keyword">this</span>.protectBroker();</span><br><span class="line"> &#125; <span class="keyword">catch</span> (Throwable e) &#123;</span><br><span class="line"> log.error(<span class="string">"protectBroker error."</span>, e);</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;, <span class="number">3</span>, <span class="number">3</span>, TimeUnit.MINUTES);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.scheduledExecutorService.scheduleAtFixedRate(<span class="keyword">new</span> Runnable() &#123;</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>&#123;</span><br><span class="line"> <span class="keyword">try</span> &#123;</span><br><span class="line"> BrokerController.<span class="keyword">this</span>.printWaterMark();</span><br><span class="line"> &#125; <span class="keyword">catch</span> (Throwable e) &#123;</span><br><span class="line"> log.error(<span class="string">"printWaterMark error."</span>, e);</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;, <span class="number">10</span>, <span class="number">1</span>, TimeUnit.SECONDS);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.scheduledExecutorService.scheduleAtFixedRate(<span class="keyword">new</span> Runnable() &#123;</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>&#123;</span><br><span class="line"> <span class="keyword">try</span> &#123;</span><br><span class="line"> log.info(<span class="string">"dispatch behind commit log &#123;&#125; bytes"</span>, BrokerController.<span class="keyword">this</span>.getMessageStore().dispatchBehindBytes());</span><br><span class="line"> &#125; <span class="keyword">catch</span> (Throwable e) &#123;</span><br><span class="line"> log.error(<span class="string">"schedule dispatchBehindBytes error."</span>, e);</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;, <span class="number">1000</span> * <span class="number">10</span>, <span class="number">1000</span> * <span class="number">60</span>, TimeUnit.MILLISECONDS);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span>.brokerConfig.getNamesrvAddr() != <span class="keyword">null</span>) &#123;</span><br><span class="line"> <span class="keyword">this</span>.brokerOuterAPI.updateNameServerAddressList(<span class="keyword">this</span>.brokerConfig.getNamesrvAddr());</span><br><span class="line"> log.info(<span class="string">"Set user specified name server address: &#123;&#125;"</span>, <span class="keyword">this</span>.brokerConfig.getNamesrvAddr());</span><br><span class="line"> &#125; <span class="keyword">else</span> <span class="keyword">if</span> (<span class="keyword">this</span>.brokerConfig.isFetchNamesrvAddrByAddressServer()) &#123;</span><br><span class="line"> <span class="keyword">this</span>.scheduledExecutorService.scheduleAtFixedRate(<span class="keyword">new</span> Runnable() &#123;</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>&#123;</span><br><span class="line"> <span class="keyword">try</span> &#123;</span><br><span class="line"> BrokerController.<span class="keyword">this</span>.brokerOuterAPI.fetchNameServerAddr();</span><br><span class="line"> &#125; <span class="keyword">catch</span> (Throwable e) &#123;</span><br><span class="line"> log.error(<span class="string">"ScheduledTask fetchNameServerAddr exception"</span>, e);</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;, <span class="number">1000</span> * <span class="number">10</span>, <span class="number">1000</span> * <span class="number">60</span> * <span class="number">2</span>, TimeUnit.MILLISECONDS);</span><br><span class="line"> &#125;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (!messageStoreConfig.isEnableDLegerCommitLog()) &#123;</span><br><span class="line"> <span class="keyword">if</span> (BrokerRole.SLAVE == <span class="keyword">this</span>.messageStoreConfig.getBrokerRole()) &#123;</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span>.messageStoreConfig.getHaMasterAddress() != <span class="keyword">null</span> &amp;&amp; <span class="keyword">this</span>.messageStoreConfig.getHaMasterAddress().length() &gt;= <span class="number">6</span>) &#123;</span><br><span class="line"> <span class="keyword">this</span>.messageStore.updateHaMasterAddress(<span class="keyword">this</span>.messageStoreConfig.getHaMasterAddress());</span><br><span class="line"> <span class="keyword">this</span>.updateMasterHAServerAddrPeriodically = <span class="keyword">false</span>;</span><br><span class="line"> &#125; <span class="keyword">else</span> &#123;</span><br><span class="line"> <span class="keyword">this</span>.updateMasterHAServerAddrPeriodically = <span class="keyword">true</span>;</span><br><span class="line"> &#125;</span><br><span class="line"> &#125; <span class="keyword">else</span> &#123;</span><br><span class="line"> <span class="keyword">this</span>.scheduledExecutorService.scheduleAtFixedRate(<span class="keyword">new</span> Runnable() &#123;</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>&#123;</span><br><span class="line"> <span class="keyword">try</span> &#123;</span><br><span class="line"> BrokerController.<span class="keyword">this</span>.printMasterAndSlaveDiff();</span><br><span class="line"> &#125; <span class="keyword">catch</span> (Throwable e) &#123;</span><br><span class="line"> log.error(<span class="string">"schedule printMasterAndSlaveDiff error."</span>, e);</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;, <span class="number">1000</span> * <span class="number">10</span>, <span class="number">1000</span> * <span class="number">60</span>, TimeUnit.MILLISECONDS);</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (TlsSystemConfig.tlsMode != TlsMode.DISABLED) &#123;</span><br><span class="line"> <span class="comment">// Register a listener to reload SslContext</span></span><br><span class="line"> <span class="keyword">try</span> &#123;</span><br><span class="line"> fileWatchService = <span class="keyword">new</span> FileWatchService(</span><br><span class="line"> <span class="keyword">new</span> String[] &#123;</span><br><span class="line"> TlsSystemConfig.tlsServerCertPath,</span><br><span class="line"> TlsSystemConfig.tlsServerKeyPath,</span><br><span class="line"> TlsSystemConfig.tlsServerTrustCertPath</span><br><span class="line"> &#125;,</span><br><span class="line"> <span class="keyword">new</span> FileWatchService.Listener() &#123;</span><br><span class="line"> <span class="keyword">boolean</span> certChanged, keyChanged = <span class="keyword">false</span>;</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onChanged</span><span class="params">(String path)</span> </span>&#123;</span><br><span class="line"> <span class="keyword">if</span> (path.equals(TlsSystemConfig.tlsServerTrustCertPath)) &#123;</span><br><span class="line"> log.info(<span class="string">"The trust certificate changed, reload the ssl context"</span>);</span><br><span class="line"> reloadServerSslContext();</span><br><span class="line"> &#125;</span><br><span class="line"> <span class="keyword">if</span> (path.equals(TlsSystemConfig.tlsServerCertPath)) &#123;</span><br><span class="line"> certChanged = <span class="keyword">true</span>;</span><br><span class="line"> &#125;</span><br><span class="line"> <span class="keyword">if</span> (path.equals(TlsSystemConfig.tlsServerKeyPath)) &#123;</span><br><span class="line"> keyChanged = <span class="keyword">true</span>;</span><br><span class="line"> &#125;</span><br><span class="line"> <span class="keyword">if</span> (certChanged &amp;&amp; keyChanged) &#123;</span><br><span class="line"> log.info(<span class="string">"The certificate and private key changed, reload the ssl context"</span>);</span><br><span class="line"> certChanged = keyChanged = <span class="keyword">false</span>;</span><br><span class="line"> reloadServerSslContext();</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">reloadServerSslContext</span><span class="params">()</span> </span>&#123;</span><br><span class="line"> ((NettyRemotingServer) remotingServer).loadSslContext();</span><br><span class="line"> ((NettyRemotingServer) fastRemotingServer).loadSslContext();</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;);</span><br><span class="line"> &#125; <span class="keyword">catch</span> (Exception e) &#123;</span><br><span class="line"> log.warn(<span class="string">"FileWatchService created error, can't load the certificate dynamically"</span>);</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;</span><br><span class="line"> initialTransaction();</span><br><span class="line"> initialAcl();</span><br><span class="line"> initialRpcHooks();</span><br><span class="line"> &#125;</span><br><span class="line"> <span class="keyword">return</span> result;</span><br></pre></td></tr></table></figure>
<p>Broker 启动过程</p>
<p>贴代码</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">start</span><span class="params">()</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span>.messageStore != <span class="keyword">null</span>) &#123;</span><br><span class="line"> <span class="keyword">this</span>.messageStore.start();</span><br><span class="line"> &#125;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span>.remotingServer != <span class="keyword">null</span>) &#123;</span><br><span class="line"> <span class="keyword">this</span>.remotingServer.start();</span><br><span class="line"> &#125;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span>.fastRemotingServer != <span class="keyword">null</span>) &#123;</span><br><span class="line"> <span class="keyword">this</span>.fastRemotingServer.start();</span><br><span class="line"> &#125;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span>.fileWatchService != <span class="keyword">null</span>) &#123;</span><br><span class="line"> <span class="keyword">this</span>.fileWatchService.start();</span><br><span class="line"> &#125;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span>.brokerOuterAPI != <span class="keyword">null</span>) &#123;</span><br><span class="line"> <span class="keyword">this</span>.brokerOuterAPI.start();</span><br><span class="line"> &#125;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span>.pullRequestHoldService != <span class="keyword">null</span>) &#123;</span><br><span class="line"> <span class="keyword">this</span>.pullRequestHoldService.start();</span><br><span class="line"> &#125;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span>.clientHousekeepingService != <span class="keyword">null</span>) &#123;</span><br><span class="line"> <span class="keyword">this</span>.clientHousekeepingService.start();</span><br><span class="line"> &#125;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span>.filterServerManager != <span class="keyword">null</span>) &#123;</span><br><span class="line"> <span class="keyword">this</span>.filterServerManager.start();</span><br><span class="line"> &#125;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (!messageStoreConfig.isEnableDLegerCommitLog()) &#123;</span><br><span class="line"> startProcessorByHa(messageStoreConfig.getBrokerRole());</span><br><span class="line"> handleSlaveSynchronize(messageStoreConfig.getBrokerRole());</span><br><span class="line"> <span class="keyword">this</span>.registerBrokerAll(<span class="keyword">true</span>, <span class="keyword">false</span>, <span class="keyword">true</span>);</span><br><span class="line"> &#125;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.scheduledExecutorService.scheduleAtFixedRate(<span class="keyword">new</span> Runnable() &#123;</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>&#123;</span><br><span class="line"> <span class="keyword">try</span> &#123;</span><br><span class="line"> BrokerController.<span class="keyword">this</span>.registerBrokerAll(<span class="keyword">true</span>, <span class="keyword">false</span>, brokerConfig.isForceRegister());</span><br><span class="line"> &#125; <span class="keyword">catch</span> (Throwable e) &#123;</span><br><span class="line"> log.error(<span class="string">"registerBrokerAll Exception"</span>, e);</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;, <span class="number">1000</span> * <span class="number">10</span>, Math.max(<span class="number">10000</span>, Math.min(brokerConfig.getRegisterNameServerPeriod(), <span class="number">60000</span>)), TimeUnit.MILLISECONDS);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span>.brokerStatsManager != <span class="keyword">null</span>) &#123;</span><br><span class="line"> <span class="keyword">this</span>.brokerStatsManager.start();</span><br><span class="line"> &#125;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span>.brokerFastFailure != <span class="keyword">null</span>) &#123;</span><br><span class="line"> <span class="keyword">this</span>.brokerFastFailure.start();</span><br><span class="line"> &#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> &#125;</span><br></pre></td></tr></table></figure>
<p>首先是启动messageStore，调用 start 方法，这里面又调用了一些代码</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">start</span><span class="params">()</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line"></span><br><span class="line"> lock = lockFile.getChannel().tryLock(<span class="number">0</span>, <span class="number">1</span>, <span class="keyword">false</span>);</span><br><span class="line"> <span class="keyword">if</span> (lock == <span class="keyword">null</span> || lock.isShared() || !lock.isValid()) &#123;</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> RuntimeException(<span class="string">"Lock failed,MQ already started"</span>);</span><br><span class="line"> &#125;</span><br><span class="line"></span><br><span class="line"> lockFile.getChannel().write(ByteBuffer.wrap(<span class="string">"lock"</span>.getBytes()));</span><br><span class="line"> lockFile.getChannel().force(<span class="keyword">true</span>);</span><br><span class="line"> &#123;</span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 1. Make sure the fast-forward messages to be truncated during the recovering according to the max physical offset of the commitlog;</span></span><br><span class="line"><span class="comment"> * 2. DLedger committedPos may be missing, so the maxPhysicalPosInLogicQueue maybe bigger that maxOffset returned by DLedgerCommitLog, just let it go;</span></span><br><span class="line"><span class="comment"> * 3. Calculate the reput offset according to the consume queue;</span></span><br><span class="line"><span class="comment"> * 4. Make sure the fall-behind messages to be dispatched before starting the commitlog, especially when the broker role are automatically changed.</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">long</span> maxPhysicalPosInLogicQueue = commitLog.getMinOffset();</span><br><span class="line"> <span class="keyword">for</span> (ConcurrentMap&lt;Integer, ConsumeQueue&gt; maps : <span class="keyword">this</span>.consumeQueueTable.values()) &#123;</span><br><span class="line"> <span class="keyword">for</span> (ConsumeQueue logic : maps.values()) &#123;</span><br><span class="line"> <span class="keyword">if</span> (logic.getMaxPhysicOffset() &gt; maxPhysicalPosInLogicQueue) &#123;</span><br><span class="line"> maxPhysicalPosInLogicQueue = logic.getMaxPhysicOffset();</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;</span><br><span class="line"> &#125;</span><br><span class="line"> <span class="keyword">if</span> (maxPhysicalPosInLogicQueue &lt; <span class="number">0</span>) &#123;</span><br><span class="line"> maxPhysicalPosInLogicQueue = <span class="number">0</span>;</span><br><span class="line"> &#125;</span><br><span class="line"> <span class="keyword">if</span> (maxPhysicalPosInLogicQueue &lt; <span class="keyword">this</span>.commitLog.getMinOffset()) &#123;</span><br><span class="line"> maxPhysicalPosInLogicQueue = <span class="keyword">this</span>.commitLog.getMinOffset();</span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * This happens in following conditions:</span></span><br><span class="line"><span class="comment"> * 1. If someone removes all the consumequeue files or the disk get damaged.</span></span><br><span class="line"><span class="comment"> * 2. Launch a new broker, and copy the commitlog from other brokers.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * All the conditions has the same in common that the maxPhysicalPosInLogicQueue should be 0.</span></span><br><span class="line"><span class="comment"> * If the maxPhysicalPosInLogicQueue is gt 0, there maybe something wrong.</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> log.warn(<span class="string">"[TooSmallCqOffset] maxPhysicalPosInLogicQueue=&#123;&#125; clMinOffset=&#123;&#125;"</span>, maxPhysicalPosInLogicQueue, <span class="keyword">this</span>.commitLog.getMinOffset());</span><br><span class="line"> &#125;</span><br><span class="line"> log.info(<span class="string">"[SetReputOffset] maxPhysicalPosInLogicQueue=&#123;&#125; clMinOffset=&#123;&#125; clMaxOffset=&#123;&#125; clConfirmedOffset=&#123;&#125;"</span>,</span><br><span class="line"> maxPhysicalPosInLogicQueue, <span class="keyword">this</span>.commitLog.getMinOffset(), <span class="keyword">this</span>.commitLog.getMaxOffset(), <span class="keyword">this</span>.commitLog.getConfirmOffset());</span><br><span class="line"> <span class="keyword">this</span>.reputMessageService.setReputFromOffset(maxPhysicalPosInLogicQueue);</span><br><span class="line"> <span class="keyword">this</span>.reputMessageService.start();</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 1. Finish dispatching the messages fall behind, then to start other services.</span></span><br><span class="line"><span class="comment"> * 2. DLedger committedPos may be missing, so here just require dispatchBehindBytes &lt;= 0</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">while</span> (<span class="keyword">true</span>) &#123;</span><br><span class="line"> <span class="keyword">if</span> (dispatchBehindBytes() &lt;= <span class="number">0</span>) &#123;</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> &#125;</span><br><span class="line"> Thread.sleep(<span class="number">1000</span>);</span><br><span class="line"> log.info(<span class="string">"Try to finish doing reput the messages fall behind during the starting, reputOffset=&#123;&#125; maxOffset=&#123;&#125; behind=&#123;&#125;"</span>, <span class="keyword">this</span>.reputMessageService.getReputFromOffset(), <span class="keyword">this</span>.getMaxPhyOffset(), <span class="keyword">this</span>.dispatchBehindBytes());</span><br><span class="line"> &#125;</span><br><span class="line"> <span class="keyword">this</span>.recoverTopicQueueTable();</span><br><span class="line"> &#125;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (!messageStoreConfig.isEnableDLegerCommitLog()) &#123;</span><br><span class="line"> <span class="keyword">this</span>.haService.start();</span><br><span class="line"> <span class="keyword">this</span>.handleScheduleMessageService(messageStoreConfig.getBrokerRole());</span><br><span class="line"> &#125;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.flushConsumeQueueService.start();</span><br><span class="line"> <span class="keyword">this</span>.commitLog.start();</span><br><span class="line"> <span class="keyword">this</span>.storeStatsService.start();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">this</span>.createTempFile();</span><br><span class="line"> <span class="keyword">this</span>.addScheduleTask();</span><br><span class="line"> <span class="keyword">this</span>.shutdown = <span class="keyword">false</span>;</span><br><span class="line"> &#125;</span><br></pre></td></tr></table></figure>
<p>调用DefaultMessageStore.start方法启动DefaultMessageStore对象中的一些服务线程。</p>
<ol>
<li>启动ReputMessageService服务线程</li>
<li>启动FlushConsumeQueueService服务线程；</li>
<li>调用CommitLog.start方法，启动CommitLog对象中的FlushCommitLogService线程服务，若是同步刷盘（SYNC_FLUSH）则是启动GroupCommitService线程服务；若是异步刷盘（ASYNC_FLUSH）则是启动FlushRealTimeService线程服务；</li>
<li>启动StoreStatsService线程服务；</li>
<li>启动定时清理任务</li>
</ol>
<p>然后是启动ClientHousekeepingService的 netty 服务端和客户端，然后是启动fileWatchService证书服务，接着启动BrokerOuterAPI中的NettyRemotingClient，即建立与NameServer的链接，用于自身Broker与其他模块的RPC功能调用；包括获取NameServer的地址、注册Broker、注销Broker、获取Topic配置、获取消息进度信息、获取订阅关系等RPC功能，然后是PullRequestHoldService服务线程，这个就是实现长轮询的，然后启动管家ClientHousekeepingService服务，负责扫描不活跃的生产者，消费者和 filter，启动FilterServerManager 过滤器服务管理，然后启动定时任务调用org.apache.rocketmq.broker.BrokerController#registerBrokerAll向所有 nameserver 注册 broker，最后是按需开启org.apache.rocketmq.store.stats.BrokerStatsManager和org.apache.rocketmq.broker.latency.BrokerFastFailure，基本上启动过程就完成了</p>
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