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class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article lang=zh-CN><link href=https://nicksxs.me/2020/07/05/%E8%81%8A%E4%B8%80%E4%B8%8B-RocketMQ-%E7%9A%84-NameServer-%E6%BA%90%E7%A0%81/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="Nicksxs 的技术博客,专注 Java、JVM、分布式系统、数据库与大模型工程实践" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="聊一下 RocketMQ 的 NameServer 源码 | Nicksxs's Blog" itemprop=name><meta content=前面介绍了,nameserver相当于dubbo的注册中心,用与管理broker,broker会在启动的时候注册到nameserver,并且会发送心跳给namaserver,nameserver负责保存活跃的broker,包括master和slave,同时保存topic和top… itemprop=description></span><header class=post-header><h1 itemprop="name headline" class=post-title>聊一下 RocketMQ 的 NameServer 源码</h1><div class=post-meta-container><div class=post-meta><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-calendar"></i> </span><span class=post-meta-item-text>发表于</span> <time itemprop="dateCreated datePublished" title="创建时间:2020-07-05 21:01:47" datetime=2020-07-05T21:01:47+08:00>2020-07-05</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/%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 itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/%E6%B6%88%E6%81%AF%E9%98%9F%E5%88%97/RocketMQ/ itemprop=url rel=index><span itemprop=name>RocketMQ</span></a> </span>, <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/%E4%B8%AD%E9%97%B4%E4%BB%B6/ itemprop=url rel=index><span itemprop=name>中间件</span></a> </span>, <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/%E4%B8%AD%E9%97%B4%E4%BB%B6/RocketMQ/ itemprop=url rel=index><span itemprop=name>RocketMQ</span></a> </span></span><span class="post-meta-item cloudflare-page-counter" data-title="聊一下 RocketMQ 的 NameServer 源码" data-increment=true data-path=/2020/07/05/%E8%81%8A%E4%B8%80%E4%B8%8B-RocketMQ-%E7%9A%84-NameServer-%E6%BA%90%E7%A0%81/ title=阅读次数><span class=post-meta-item-icon><i class="far fa-eye"></i> </span><span class=post-meta-item-text>阅读次数:</span> <span class=cloudflare-page-counter-count></span></span></div><div class=post-description>前面介绍了,nameserver相当于dubbo的注册中心,用与管理broker,broker会在启动的时候注册到nameserver,并且会发送心跳给namaserver,nameserver负责保存活跃的broker,包括master和slave,同时保存topic和top…</div></div></header><div class=post-body itemprop=articleBody><p>前面介绍了,nameserver相当于dubbo的注册中心,用与管理broker,broker会在启动的时候注册到nameserver,并且会发送心跳给namaserver,nameserver负责保存活跃的broker,包括master和slave,同时保存topic和topic下的队列,以及filter列表,然后为producer和consumer的请求提供服务。<h3 id=启动过程><a class=headerlink href=#启动过程 title=启动过程></a>启动过程</h3><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></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>void</span> <span class="title function_">main</span><span class=params>(String[] args)</span> {</span><br><span class=line> main0(args);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>static</span> NamesrvController <span class="title function_">main0</span><span class=params>(String[] args)</span> {</span><br><span class=line></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=type>NamesrvController</span> <span class=variable>controller</span> <span class=operator>=</span> createNamesrvController(args);</span><br><span class=line> start(controller);</span><br><span class=line> <span class=type>String</span> <span class=variable>tip</span> <span class=operator>=</span> <span class=string>"The Name Server boot success. serializeType="</span> + RemotingCommand.getSerializeTypeConfigInThisServer();</span><br><span class=line> log.info(tip);</span><br><span class=line> System.out.printf(<span class=string>"%s%n"</span>, tip);</span><br><span class=line> <span class=keyword>return</span> controller;</span><br><span class=line> } <span class=keyword>catch</span> (Throwable e) {</span><br><span class=line> e.printStackTrace();</span><br><span class=line> System.exit(-<span class=number>1</span>);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>return</span> <span class=literal>null</span>;</span><br><span class=line> }</span><br></pre></table></figure><p>入口的代码时这样子,其实主要的逻辑在createNamesrvController和start方法,来看下这两个的实现<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br><span class=line>49</span><br><span class=line>50</span><br><span class=line>51</span><br><span class=line>52</span><br><span class=line>53</span><br><span class=line>54</span><br><span class=line>55</span><br><span class=line>56</span><br><span class=line>57</span><br><span class=line>58</span><br><span class=line>59</span><br><span class=line>60</span><br><span class=line>61</span><br><span class=line>62</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>static</span> NamesrvController <span class="title function_">createNamesrvController</span><span class=params>(String[] args)</span> <span class=keyword>throws</span> IOException, JoranException {</span><br><span class=line> System.setProperty(RemotingCommand.REMOTING_VERSION_KEY, Integer.toString(MQVersion.CURRENT_VERSION));</span><br><span class=line> <span class=comment>//PackageConflictDetect.detectFastjson();</span></span><br><span class=line></span><br><span class=line> <span class=type>Options</span> <span class=variable>options</span> <span class=operator>=</span> ServerUtil.buildCommandlineOptions(<span class=keyword>new</span> <span class="title class_">Options</span>());</span><br><span class=line> commandLine = ServerUtil.parseCmdLine(<span class=string>"mqnamesrv"</span>, args, buildCommandlineOptions(options), <span class=keyword>new</span> <span class="title class_">PosixParser</span>());</span><br><span class=line> <span class=keyword>if</span> (<span class=literal>null</span> == commandLine) {</span><br><span class=line> System.exit(-<span class=number>1</span>);</span><br><span class=line> <span class=keyword>return</span> <span class=literal>null</span>;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>final</span> <span class=type>NamesrvConfig</span> <span class=variable>namesrvConfig</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">NamesrvConfig</span>();</span><br><span class=line> <span class=keyword>final</span> <span class=type>NettyServerConfig</span> <span class=variable>nettyServerConfig</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">NettyServerConfig</span>();</span><br><span class=line> nettyServerConfig.setListenPort(<span class=number>9876</span>);</span><br><span class=line> <span class=keyword>if</span> (commandLine.hasOption(<span class=string>'c'</span>)) {</span><br><span class=line> <span class=type>String</span> <span class=variable>file</span> <span class=operator>=</span> commandLine.getOptionValue(<span class=string>'c'</span>);</span><br><span class=line> <span class=keyword>if</span> (file != <span class=literal>null</span>) {</span><br><span class=line> <span class=type>InputStream</span> <span class=variable>in</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">BufferedInputStream</span>(<span class=keyword>new</span> <span class="title class_">FileInputStream</span>(file));</span><br><span class=line> properties = <span class=keyword>new</span> <span class="title class_">Properties</span>();</span><br><span class=line> properties.load(in);</span><br><span class=line> MixAll.properties2Object(properties, namesrvConfig);</span><br><span class=line> MixAll.properties2Object(properties, nettyServerConfig);</span><br><span class=line></span><br><span class=line> namesrvConfig.setConfigStorePath(file);</span><br><span class=line></span><br><span class=line> System.out.printf(<span class=string>"load config properties file OK, %s%n"</span>, file);</span><br><span class=line> in.close();</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (commandLine.hasOption(<span class=string>'p'</span>)) {</span><br><span class=line> <span class=type>InternalLogger</span> <span class=variable>console</span> <span class=operator>=</span> InternalLoggerFactory.getLogger(LoggerName.NAMESRV_CONSOLE_NAME);</span><br><span class=line> MixAll.printObjectProperties(console, namesrvConfig);</span><br><span class=line> MixAll.printObjectProperties(console, nettyServerConfig);</span><br><span class=line> System.exit(<span class=number>0</span>);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> MixAll.properties2Object(ServerUtil.commandLine2Properties(commandLine), namesrvConfig);</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (<span class=literal>null</span> == namesrvConfig.getRocketmqHome()) {</span><br><span class=line> System.out.printf(<span class=string>"Please set the %s variable in your environment to match the location of the RocketMQ installation%n"</span>, MixAll.ROCKETMQ_HOME_ENV);</span><br><span class=line> System.exit(-<span class=number>2</span>);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=type>LoggerContext</span> <span class=variable>lc</span> <span class=operator>=</span> (LoggerContext) LoggerFactory.getILoggerFactory();</span><br><span class=line> <span class=type>JoranConfigurator</span> <span class=variable>configurator</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">JoranConfigurator</span>();</span><br><span class=line> configurator.setContext(lc);</span><br><span class=line> lc.reset();</span><br><span class=line> configurator.doConfigure(namesrvConfig.getRocketmqHome() + <span class=string>"/conf/logback_namesrv.xml"</span>);</span><br><span class=line></span><br><span class=line> log = InternalLoggerFactory.getLogger(LoggerName.NAMESRV_LOGGER_NAME);</span><br><span class=line></span><br><span class=line> MixAll.printObjectProperties(log, namesrvConfig);</span><br><span class=line> MixAll.printObjectProperties(log, nettyServerConfig);</span><br><span class=line></span><br><span class=line> <span class=keyword>final</span> <span class=type>NamesrvController</span> <span class=variable>controller</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">NamesrvController</span>(namesrvConfig, nettyServerConfig);</span><br><span class=line></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>return</span> controller;</span><br><span class=line> }</span><br></pre></table></figure><p>这个方法里其实主要是读取一些配置啥的,不是很复杂,<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></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>static</span> NamesrvController <span class="title function_">start</span><span class=params>(<span class=keyword>final</span> NamesrvController controller)</span> <span class=keyword>throws</span> Exception {</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (<span class=literal>null</span> == controller) {</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">IllegalArgumentException</span>(<span class=string>"NamesrvController is null"</span>);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=type>boolean</span> <span class=variable>initResult</span> <span class=operator>=</span> controller.initialize();</span><br><span class=line> <span class=keyword>if</span> (!initResult) {</span><br><span class=line> controller.shutdown();</span><br><span class=line> System.exit(-<span class=number>3</span>);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> Runtime.getRuntime().addShutdownHook(<span class=keyword>new</span> <span class="title class_">ShutdownHookThread</span>(log, <span class=keyword>new</span> <span class="title class_">Callable</span>&LTVoid>() {</span><br><span class=line> <span class=meta>@Override</span></span><br><span class=line> <span class=keyword>public</span> Void <span class="title function_">call</span><span class=params>()</span> <span class=keyword>throws</span> Exception {</span><br><span class=line> controller.shutdown();</span><br><span class=line> <span class=keyword>return</span> <span class=literal>null</span>;</span><br><span class=line> }</span><br><span class=line> }));</span><br><span class=line></span><br><span class=line> controller.start();</span><br><span class=line></span><br><span class=line> <span class=keyword>return</span> controller;</span><br><span class=line> }</span><br></pre></table></figure><p>这个start里主要关注initialize方法,后面就是一个停机的hook,来看下initialize方法<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></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=type>boolean</span> <span class="title function_">initialize</span><span class=params>()</span> {</span><br><span class=line></span><br><span class=line> <span class=built_in>this</span>.kvConfigManager.load();</span><br><span class=line></span><br><span class=line> <span class=built_in>this</span>.remotingServer = <span class=keyword>new</span> <span class="title class_">NettyRemotingServer</span>(<span class=built_in>this</span>.nettyServerConfig, <span class=built_in>this</span>.brokerHousekeepingService);</span><br><span class=line></span><br><span class=line> <span class=built_in>this</span>.remotingExecutor =</span><br><span class=line> Executors.newFixedThreadPool(nettyServerConfig.getServerWorkerThreads(), <span class=keyword>new</span> <span class="title class_">ThreadFactoryImpl</span>(<span class=string>"RemotingExecutorThread_"</span>));</span><br><span class=line></span><br><span class=line> <span class=built_in>this</span>.registerProcessor();</span><br><span class=line></span><br><span class=line> <span class=built_in>this</span>.scheduledExecutorService.scheduleAtFixedRate(<span class=keyword>new</span> <span class="title class_">Runnable</span>() {</span><br><span class=line></span><br><span class=line> <span class=meta>@Override</span></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">run</span><span class=params>()</span> {</span><br><span class=line> NamesrvController.<span class=built_in>this</span>.routeInfoManager.scanNotActiveBroker();</span><br><span class=line> }</span><br><span class=line> }, <span class=number>5</span>, <span class=number>10</span>, TimeUnit.SECONDS);</span><br><span class=line></span><br><span class=line> <span class=built_in>this</span>.scheduledExecutorService.scheduleAtFixedRate(<span class=keyword>new</span> <span class="title class_">Runnable</span>() {</span><br><span class=line></span><br><span class=line> <span class=meta>@Override</span></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">run</span><span class=params>()</span> {</span><br><span class=line> NamesrvController.<span class=built_in>this</span>.kvConfigManager.printAllPeriodically();</span><br><span class=line> }</span><br><span class=line> }, <span class=number>1</span>, <span class=number>10</span>, TimeUnit.MINUTES);</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (TlsSystemConfig.tlsMode != TlsMode.DISABLED) {</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> {</span><br><span class=line> fileWatchService = <span class=keyword>new</span> <span class="title class_">FileWatchService</span>(</span><br><span class=line> <span class=keyword>new</span> <span class="title class_">String</span>[] {</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> },</span><br><span class=line> <span class=keyword>new</span> <span class="title class_">FileWatchService</span>.Listener() {</span><br><span class=line> <span class=type>boolean</span> certChanged, keyChanged = <span class=literal>false</span>;</span><br><span class=line> <span class=meta>@Override</span></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">onChanged</span><span class=params>(String path)</span> {</span><br><span class=line> <span class=keyword>if</span> (path.equals(TlsSystemConfig.tlsServerTrustCertPath)) {</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> }</span><br><span class=line> <span class=keyword>if</span> (path.equals(TlsSystemConfig.tlsServerCertPath)) {</span><br><span class=line> certChanged = <span class=literal>true</span>;</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (path.equals(TlsSystemConfig.tlsServerKeyPath)) {</span><br><span class=line> keyChanged = <span class=literal>true</span>;</span><br><span class=line> }</span><br><span class=line> <span class=keyword>if</span> (certChanged && keyChanged) {</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=literal>false</span>;</span><br><span class=line> reloadServerSslContext();</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> <span class=keyword>private</span> <span class=keyword>void</span> <span class="title function_">reloadServerSslContext</span><span class=params>()</span> {</span><br><span class=line> ((NettyRemotingServer) remotingServer).loadSslContext();</span><br><span class=line> }</span><br><span class=line> });</span><br><span class=line> } <span class=keyword>catch</span> (Exception e) {</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> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>return</span> <span class=literal>true</span>;</span><br><span class=line> }</span><br></pre></table></figure><p>这里的kvConfigManager主要是来加载NameServer的配置参数,存到org.apache.rocketmq.namesrv.kvconfig.KVConfigManager#configTable中,然后是以BrokerHousekeepingService对象为参数初始化NettyRemotingServer对象,BrokerHousekeepingService对象作为该Netty连接中Socket链接的监听器(ChannelEventListener);监听与Broker建立的渠道的状态(空闲、关闭、异常三个状态),并调用BrokerHousekeepingService的相应onChannel方法。其中渠道的空闲、关闭、异常状态均调用RouteInfoManager.onChannelDestory方法处理。这个BrokerHousekeepingService可以字面化地理解为broker的管家服务,这个类内部三个状态方法其实都是调用的org.apache.rocketmq.namesrv.NamesrvController#getRouteInfoManager方法,而这个RouteInfoManager里面的对象有这些<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></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>class</span> <span class="title class_">RouteInfoManager</span> {</span><br><span class=line> <span class=keyword>private</span> <span class=keyword>static</span> <span class=keyword>final</span> <span class=type>InternalLogger</span> <span class=variable>log</span> <span class=operator>=</span> InternalLoggerFactory.getLogger(LoggerName.NAMESRV_LOGGER_NAME);</span><br><span class=line> <span class=keyword>private</span> <span class=keyword>final</span> <span class=keyword>static</span> <span class=type>long</span> <span class=variable>BROKER_CHANNEL_EXPIRED_TIME</span> <span class=operator>=</span> <span class=number>1000</span> * <span class=number>60</span> * <span class=number>2</span>;</span><br><span class=line> <span class=keyword>private</span> <span class=keyword>final</span> <span class=type>ReadWriteLock</span> <span class=variable>lock</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">ReentrantReadWriteLock</span>();</span><br><span class=line> <span class=comment>// topic与queue的对应关系</span></span><br><span class=line> <span class=keyword>private</span> <span class=keyword>final</span> HashMap&LTString<span class=comment>/* topic */</span>, List&LTQueueData>> topicQueueTable;</span><br><span class=line> <span class=comment>// Broker名称与broker属性的map</span></span><br><span class=line> <span class=keyword>private</span> <span class=keyword>final</span> HashMap&LTString<span class=comment>/* brokerName */</span>, BrokerData> brokerAddrTable;</span><br><span class=line> <span class=comment>// 集群与broker集合的对应关系</span></span><br><span class=line> <span class=keyword>private</span> <span class=keyword>final</span> HashMap&LTString<span class=comment>/* clusterName */</span>, Set&LTString<span class=comment>/* brokerName */</span>>> clusterAddrTable;</span><br><span class=line> <span class=comment>// 活跃的broker信息</span></span><br><span class=line> <span class=keyword>private</span> <span class=keyword>final</span> HashMap&LTString<span class=comment>/* brokerAddr */</span>, BrokerLiveInfo> brokerLiveTable;</span><br><span class=line> <span class=comment>// Broker地址与过滤器</span></span><br><span class=line> <span class=keyword>private</span> <span class=keyword>final</span> HashMap&LTString<span class=comment>/* brokerAddr */</span>, List&LTString><span class=comment>/* Filter Server */</span>> filterServerTable;</span><br></pre></table></figure><p>然后接下去就是初始化了一个线程池,然后注册默认的处理类<code>this.registerProcessor();</code>默认都是这个处理器去处理请求 <code>org.apache.rocketmq.namesrv.processor.DefaultRequestProcessor#DefaultRequestProcessor</code>然后是初始化两个定时任务<p>第一是每10秒检查一遍Broker的状态的定时任务,调用scanNotActiveBroker方法;遍历brokerLiveTable集合,查看每个broker的最后更新时间(BrokerLiveInfo.lastUpdateTimestamp)是否超过2分钟,若超过则关闭该broker的渠道并调用RouteInfoManager.onChannelDestory方法清理RouteInfoManager类的topicQueueTable、brokerAddrTable、clusterAddrTable、filterServerTable成员变量。<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br><span class=line>49</span><br><span class=line>50</span><br><span class=line>51</span><br><span class=line>52</span><br><span class=line>53</span><br><span class=line>54</span><br><span class=line>55</span><br><span class=line>56</span><br><span class=line>57</span><br><span class=line>58</span><br><span class=line>59</span><br><span class=line>60</span><br><span class=line>61</span><br><span class=line>62</span><br><span class=line>63</span><br><span class=line>64</span><br><span class=line>65</span><br><span class=line>66</span><br><span class=line>67</span><br><span class=line>68</span><br><span class=line>69</span><br><span class=line>70</span><br><span class=line>71</span><br><span class=line>72</span><br><span class=line>73</span><br><span class=line>74</span><br><span class=line>75</span><br><span class=line>76</span><br><span class=line>77</span><br><span class=line>78</span><br><span class=line>79</span><br><span class=line>80</span><br><span class=line>81</span><br><span class=line>82</span><br><span class=line>83</span><br><span class=line>84</span><br><span class=line>85</span><br><span class=line>86</span><br><span class=line>87</span><br><span class=line>88</span><br><span class=line>89</span><br><span class=line>90</span><br><span class=line>91</span><br><span class=line>92</span><br><span class=line>93</span><br><span class=line>94</span><br><span class=line>95</span><br><span class=line>96</span><br><span class=line>97</span><br><span class=line>98</span><br><span class=line>99</span><br><span class=line>100</span><br><span class=line>101</span><br><span class=line>102</span><br><span class=line>103</span><br><span class=line>104</span><br><span class=line>105</span><br><span class=line>106</span><br><span class=line>107</span><br><span class=line>108</span><br><span class=line>109</span><br><span class=line>110</span><br><span class=line>111</span><br><span class=line>112</span><br><span class=line>113</span><br><span class=line>114</span><br><span class=line>115</span><br><span class=line>116</span><br><span class=line>117</span><br><span class=line>118</span><br><span class=line>119</span><br><span class=line>120</span><br><span class=line>121</span><br><span class=line>122</span><br><span class=line>123</span><br><span class=line>124</span><br><span class=line>125</span><br><span class=line>126</span><br><span class=line>127</span><br><span class=line>128</span><br><span class=line>129</span><br><span class=line>130</span><br><span class=line>131</span><br><span class=line>132</span><br><span class=line>133</span><br><span class=line>134</span><br><span class=line>135</span><br><span class=line>136</span><br><span class=line>137</span><br><span class=line>138</span><br><span class=line>139</span><br><span class=line>140</span><br><span class=line>141</span><br></pre><td class=code><pre><span class=line><span class=built_in>this</span>.scheduledExecutorService.scheduleAtFixedRate(<span class=keyword>new</span> <span class="title class_">Runnable</span>() {</span><br><span class=line></span><br><span class=line> <span class=meta>@Override</span></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">run</span><span class=params>()</span> {</span><br><span class=line> NamesrvController.<span class=built_in>this</span>.routeInfoManager.scanNotActiveBroker();</span><br><span class=line> }</span><br><span class=line> }, <span class=number>5</span>, <span class=number>10</span>, TimeUnit.SECONDS);</span><br><span class=line><span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">scanNotActiveBroker</span><span class=params>()</span> {</span><br><span class=line> Iterator&LTEntry&LTString, BrokerLiveInfo>> it = <span class=built_in>this</span>.brokerLiveTable.entrySet().iterator();</span><br><span class=line> <span class=keyword>while</span> (it.hasNext()) {</span><br><span class=line> Entry&LTString, BrokerLiveInfo> next = it.next();</span><br><span class=line> <span class=type>long</span> <span class=variable>last</span> <span class=operator>=</span> next.getValue().getLastUpdateTimestamp();</span><br><span class=line> <span class=keyword>if</span> ((last + BROKER_CHANNEL_EXPIRED_TIME) < System.currentTimeMillis()) {</span><br><span class=line> RemotingUtil.closeChannel(next.getValue().getChannel());</span><br><span class=line> it.remove();</span><br><span class=line> log.warn(<span class=string>"The broker channel expired, {} {}ms"</span>, next.getKey(), BROKER_CHANNEL_EXPIRED_TIME);</span><br><span class=line> <span class=built_in>this</span>.onChannelDestroy(next.getKey(), next.getValue().getChannel());</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">onChannelDestroy</span><span class=params>(String remoteAddr, Channel channel)</span> {</span><br><span class=line> <span class=type>String</span> <span class=variable>brokerAddrFound</span> <span class=operator>=</span> <span class=literal>null</span>;</span><br><span class=line> <span class=keyword>if</span> (channel != <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=built_in>this</span>.lock.readLock().lockInterruptibly();</span><br><span class=line> Iterator&LTEntry&LTString, BrokerLiveInfo>> itBrokerLiveTable =</span><br><span class=line> <span class=built_in>this</span>.brokerLiveTable.entrySet().iterator();</span><br><span class=line> <span class=keyword>while</span> (itBrokerLiveTable.hasNext()) {</span><br><span class=line> Entry&LTString, BrokerLiveInfo> entry = itBrokerLiveTable.next();</span><br><span class=line> <span class=keyword>if</span> (entry.getValue().getChannel() == channel) {</span><br><span class=line> brokerAddrFound = entry.getKey();</span><br><span class=line> <span class=keyword>break</span>;</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>finally</span> {</span><br><span class=line> <span class=built_in>this</span>.lock.readLock().unlock();</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>catch</span> (Exception e) {</span><br><span class=line> log.error(<span class=string>"onChannelDestroy Exception"</span>, e);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (<span class=literal>null</span> == brokerAddrFound) {</span><br><span class=line> brokerAddrFound = remoteAddr;</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> log.info(<span class=string>"the broker's channel destroyed, {}, clean it's data structure at once"</span>, brokerAddrFound);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (brokerAddrFound != <span class=literal>null</span> && brokerAddrFound.length() > <span class=number>0</span>) {</span><br><span class=line></span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=built_in>this</span>.lock.writeLock().lockInterruptibly();</span><br><span class=line> <span class=built_in>this</span>.brokerLiveTable.remove(brokerAddrFound);</span><br><span class=line> <span class=built_in>this</span>.filterServerTable.remove(brokerAddrFound);</span><br><span class=line> <span class=type>String</span> <span class=variable>brokerNameFound</span> <span class=operator>=</span> <span class=literal>null</span>;</span><br><span class=line> <span class=type>boolean</span> <span class=variable>removeBrokerName</span> <span class=operator>=</span> <span class=literal>false</span>;</span><br><span class=line> Iterator&LTEntry&LTString, BrokerData>> itBrokerAddrTable =</span><br><span class=line> <span class=built_in>this</span>.brokerAddrTable.entrySet().iterator();</span><br><span class=line> <span class=keyword>while</span> (itBrokerAddrTable.hasNext() && (<span class=literal>null</span> == brokerNameFound)) {</span><br><span class=line> <span class=type>BrokerData</span> <span class=variable>brokerData</span> <span class=operator>=</span> itBrokerAddrTable.next().getValue();</span><br><span class=line></span><br><span class=line> Iterator&LTEntry&LTLong, String>> it = brokerData.getBrokerAddrs().entrySet().iterator();</span><br><span class=line> <span class=keyword>while</span> (it.hasNext()) {</span><br><span class=line> Entry&LTLong, String> entry = it.next();</span><br><span class=line> <span class=type>Long</span> <span class=variable>brokerId</span> <span class=operator>=</span> entry.getKey();</span><br><span class=line> <span class=type>String</span> <span class=variable>brokerAddr</span> <span class=operator>=</span> entry.getValue();</span><br><span class=line> <span class=keyword>if</span> (brokerAddr.equals(brokerAddrFound)) {</span><br><span class=line> brokerNameFound = brokerData.getBrokerName();</span><br><span class=line> it.remove();</span><br><span class=line> log.info(<span class=string>"remove brokerAddr[{}, {}] from brokerAddrTable, because channel destroyed"</span>,</span><br><span class=line> brokerId, brokerAddr);</span><br><span class=line> <span class=keyword>break</span>;</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (brokerData.getBrokerAddrs().isEmpty()) {</span><br><span class=line> removeBrokerName = <span class=literal>true</span>;</span><br><span class=line> itBrokerAddrTable.remove();</span><br><span class=line> log.info(<span class=string>"remove brokerName[{}] from brokerAddrTable, because channel destroyed"</span>,</span><br><span class=line> brokerData.getBrokerName());</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (brokerNameFound != <span class=literal>null</span> && removeBrokerName) {</span><br><span class=line> Iterator&LTEntry&LTString, Set&LTString>>> it = <span class=built_in>this</span>.clusterAddrTable.entrySet().iterator();</span><br><span class=line> <span class=keyword>while</span> (it.hasNext()) {</span><br><span class=line> Entry&LTString, Set&LTString>> entry = it.next();</span><br><span class=line> <span class=type>String</span> <span class=variable>clusterName</span> <span class=operator>=</span> entry.getKey();</span><br><span class=line> Set&LTString> brokerNames = entry.getValue();</span><br><span class=line> <span class=type>boolean</span> <span class=variable>removed</span> <span class=operator>=</span> brokerNames.remove(brokerNameFound);</span><br><span class=line> <span class=keyword>if</span> (removed) {</span><br><span class=line> log.info(<span class=string>"remove brokerName[{}], clusterName[{}] from clusterAddrTable, because channel destroyed"</span>,</span><br><span class=line> brokerNameFound, clusterName);</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (brokerNames.isEmpty()) {</span><br><span class=line> log.info(<span class=string>"remove the clusterName[{}] from clusterAddrTable, because channel destroyed and no broker in this cluster"</span>,</span><br><span class=line> clusterName);</span><br><span class=line> it.remove();</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>break</span>;</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (removeBrokerName) {</span><br><span class=line> Iterator&LTEntry&LTString, List&LTQueueData>>> itTopicQueueTable =</span><br><span class=line> <span class=built_in>this</span>.topicQueueTable.entrySet().iterator();</span><br><span class=line> <span class=keyword>while</span> (itTopicQueueTable.hasNext()) {</span><br><span class=line> Entry&LTString, List&LTQueueData>> entry = itTopicQueueTable.next();</span><br><span class=line> <span class=type>String</span> <span class=variable>topic</span> <span class=operator>=</span> entry.getKey();</span><br><span class=line> List&LTQueueData> queueDataList = entry.getValue();</span><br><span class=line></span><br><span class=line> Iterator&LTQueueData> itQueueData = queueDataList.iterator();</span><br><span class=line> <span class=keyword>while</span> (itQueueData.hasNext()) {</span><br><span class=line> <span class=type>QueueData</span> <span class=variable>queueData</span> <span class=operator>=</span> itQueueData.next();</span><br><span class=line> <span class=keyword>if</span> (queueData.getBrokerName().equals(brokerNameFound)) {</span><br><span class=line> itQueueData.remove();</span><br><span class=line> log.info(<span class=string>"remove topic[{} {}], from topicQueueTable, because channel destroyed"</span>,</span><br><span class=line> topic, queueData);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (queueDataList.isEmpty()) {</span><br><span class=line> itTopicQueueTable.remove();</span><br><span class=line> log.info(<span class=string>"remove topic[{}] all queue, from topicQueueTable, because channel destroyed"</span>,</span><br><span class=line> topic);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>finally</span> {</span><br><span class=line> <span class=built_in>this</span>.lock.writeLock().unlock();</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>catch</span> (Exception e) {</span><br><span class=line> log.error(<span class=string>"onChannelDestroy Exception"</span>, e);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> }</span><br></pre></table></figure><p>第二个是每10分钟打印一次NameServer的配置参数。即KVConfigManager.configTable变量的内容。<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></pre><td class=code><pre><span class=line><span class=built_in>this</span>.scheduledExecutorService.scheduleAtFixedRate(<span class=keyword>new</span> <span class="title class_">Runnable</span>() {</span><br><span class=line></span><br><span class=line> <span class=meta>@Override</span></span><br><span class=line> <span class=keyword>public</span> <span class=keyword>void</span> <span class="title function_">run</span><span class=params>()</span> {</span><br><span class=line> NamesrvController.<span class=built_in>this</span>.kvConfigManager.printAllPeriodically();</span><br><span class=line> }</span><br><span class=line> }, <span class=number>1</span>, <span class=number>10</span>, TimeUnit.MINUTES);</span><br></pre></table></figure><p>然后这个初始化就差不多完成了,后面只需要把remotingServer start一下就好了<h3 id=处理请求><a class=headerlink href=#处理请求 title=处理请求></a>处理请求</h3><p>直接上代码,其实主体是swtich case去判断<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 class=code><pre><span class=line><span class=meta>@Override</span></span><br><span class=line> <span class=keyword>public</span> RemotingCommand <span class="title function_">processRequest</span><span class=params>(ChannelHandlerContext ctx,</span></span><br><span class=line><span class=params> RemotingCommand request)</span> <span class=keyword>throws</span> RemotingCommandException {</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (ctx != <span class=literal>null</span>) {</span><br><span class=line> log.debug(<span class=string>"receive request, {} {} {}"</span>,</span><br><span class=line> request.getCode(),</span><br><span class=line> RemotingHelper.parseChannelRemoteAddr(ctx.channel()),</span><br><span class=line> request);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line></span><br><span class=line> <span class=keyword>switch</span> (request.getCode()) {</span><br><span class=line> <span class=keyword>case</span> RequestCode.PUT_KV_CONFIG:</span><br><span class=line> <span class=keyword>return</span> <span class=built_in>this</span>.putKVConfig(ctx, request);</span><br><span class=line> <span class=keyword>case</span> RequestCode.GET_KV_CONFIG:</span><br><span class=line> <span class=keyword>return</span> <span class=built_in>this</span>.getKVConfig(ctx, request);</span><br><span class=line> <span class=keyword>case</span> RequestCode.DELETE_KV_CONFIG:</span><br><span class=line> <span class=keyword>return</span> <span class=built_in>this</span>.deleteKVConfig(ctx, request);</span><br><span class=line> <span class=keyword>case</span> RequestCode.QUERY_DATA_VERSION:</span><br><span class=line> <span class=keyword>return</span> queryBrokerTopicConfig(ctx, request);</span><br><span class=line> <span class=keyword>case</span> RequestCode.REGISTER_BROKER:</span><br><span class=line> <span class=type>Version</span> <span class=variable>brokerVersion</span> <span class=operator>=</span> MQVersion.value2Version(request.getVersion());</span><br><span class=line> <span class=keyword>if</span> (brokerVersion.ordinal() >= MQVersion.Version.V3_0_11.ordinal()) {</span><br><span class=line> <span class=keyword>return</span> <span class=built_in>this</span>.registerBrokerWithFilterServer(ctx, request);</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> <span class=keyword>return</span> <span class=built_in>this</span>.registerBroker(ctx, request);</span><br><span class=line> }</span><br><span class=line> <span class=keyword>case</span> RequestCode.UNREGISTER_BROKER:</span><br><span class=line> <span class=keyword>return</span> <span class=built_in>this</span>.unregisterBroker(ctx, request);</span><br><span class=line> <span class=keyword>case</span> RequestCode.GET_ROUTEINTO_BY_TOPIC:</span><br><span class=line> <span class=keyword>return</span> <span class=built_in>this</span>.getRouteInfoByTopic(ctx, request);</span><br><span class=line> <span class=keyword>case</span> RequestCode.GET_BROKER_CLUSTER_INFO:</span><br><span class=line> <span class=keyword>return</span> <span class=built_in>this</span>.getBrokerClusterInfo(ctx, request);</span><br><span class=line> <span class=keyword>case</span> RequestCode.WIPE_WRITE_PERM_OF_BROKER:</span><br><span class=line> <span class=keyword>return</span> <span class=built_in>this</span>.wipeWritePermOfBroker(ctx, request);</span><br><span class=line> <span class=keyword>case</span> RequestCode.GET_ALL_TOPIC_LIST_FROM_NAMESERVER:</span><br><span class=line> <span class=keyword>return</span> getAllTopicListFromNameserver(ctx, request);</span><br><span class=line> <span class=keyword>case</span> RequestCode.DELETE_TOPIC_IN_NAMESRV:</span><br><span class=line> <span class=keyword>return</span> deleteTopicInNamesrv(ctx, request);</span><br><span class=line> <span class=keyword>case</span> RequestCode.GET_KVLIST_BY_NAMESPACE:</span><br><span class=line> <span class=keyword>return</span> <span class=built_in>this</span>.getKVListByNamespace(ctx, request);</span><br><span class=line> <span class=keyword>case</span> RequestCode.GET_TOPICS_BY_CLUSTER:</span><br><span class=line> <span class=keyword>return</span> <span class=built_in>this</span>.getTopicsByCluster(ctx, request);</span><br><span class=line> <span class=keyword>case</span> RequestCode.GET_SYSTEM_TOPIC_LIST_FROM_NS:</span><br><span class=line> <span class=keyword>return</span> <span class=built_in>this</span>.getSystemTopicListFromNs(ctx, request);</span><br><span class=line> <span class=keyword>case</span> RequestCode.GET_UNIT_TOPIC_LIST:</span><br><span class=line> <span class=keyword>return</span> <span class=built_in>this</span>.getUnitTopicList(ctx, request);</span><br><span class=line> <span class=keyword>case</span> RequestCode.GET_HAS_UNIT_SUB_TOPIC_LIST:</span><br><span class=line> <span class=keyword>return</span> <span class=built_in>this</span>.getHasUnitSubTopicList(ctx, request);</span><br><span class=line> <span class=keyword>case</span> RequestCode.GET_HAS_UNIT_SUB_UNUNIT_TOPIC_LIST:</span><br><span class=line> <span class=keyword>return</span> <span class=built_in>this</span>.getHasUnitSubUnUnitTopicList(ctx, request);</span><br><span class=line> <span class=keyword>case</span> RequestCode.UPDATE_NAMESRV_CONFIG:</span><br><span class=line> <span class=keyword>return</span> <span class=built_in>this</span>.updateConfig(ctx, request);</span><br><span class=line> <span class=keyword>case</span> RequestCode.GET_NAMESRV_CONFIG:</span><br><span class=line> <span class=keyword>return</span> <span class=built_in>this</span>.getConfig(ctx, request);</span><br><span class=line> <span class=keyword>default</span>:</span><br><span class=line> <span class=keyword>break</span>;</span><br><span class=line> }</span><br><span class=line> <span class=keyword>return</span> <span class=literal>null</span>;</span><br><span class=line> }</span><br></pre></table></figure><p>以broker注册为例,<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br></pre><td class=code><pre><span class=line><span class=keyword>case</span> RequestCode.REGISTER_BROKER:</span><br><span class=line> <span class=type>Version</span> <span class=variable>brokerVersion</span> <span class=operator>=</span> MQVersion.value2Version(request.getVersion());</span><br><span class=line> <span class=keyword>if</span> (brokerVersion.ordinal() >= MQVersion.Version.V3_0_11.ordinal()) {</span><br><span class=line> <span class=keyword>return</span> <span class=built_in>this</span>.registerBrokerWithFilterServer(ctx, request);</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> <span class=keyword>return</span> <span class=built_in>this</span>.registerBroker(ctx, request);</span><br><span class=line> }</span><br></pre></table></figure><p>做了个简单的版本管理,我们看下前面一个的代码<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 class=code><pre><span class=line><span class=keyword>public</span> RemotingCommand <span class="title function_">registerBrokerWithFilterServer</span><span class=params>(ChannelHandlerContext ctx, RemotingCommand request)</span></span><br><span class=line> <span class=keyword>throws</span> RemotingCommandException {</span><br><span class=line> <span class=keyword>final</span> <span class=type>RemotingCommand</span> <span class=variable>response</span> <span class=operator>=</span> RemotingCommand.createResponseCommand(RegisterBrokerResponseHeader.class);</span><br><span class=line> <span class=keyword>final</span> <span class=type>RegisterBrokerResponseHeader</span> <span class=variable>responseHeader</span> <span class=operator>=</span> (RegisterBrokerResponseHeader) response.readCustomHeader();</span><br><span class=line> <span class=keyword>final</span> <span class=type>RegisterBrokerRequestHeader</span> <span class=variable>requestHeader</span> <span class=operator>=</span></span><br><span class=line> (RegisterBrokerRequestHeader) request.decodeCommandCustomHeader(RegisterBrokerRequestHeader.class);</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (!checksum(ctx, request, requestHeader)) {</span><br><span class=line> response.setCode(ResponseCode.SYSTEM_ERROR);</span><br><span class=line> response.setRemark(<span class=string>"crc32 not match"</span>);</span><br><span class=line> <span class=keyword>return</span> response;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=type>RegisterBrokerBody</span> <span class=variable>registerBrokerBody</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">RegisterBrokerBody</span>();</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (request.getBody() != <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> registerBrokerBody = RegisterBrokerBody.decode(request.getBody(), requestHeader.isCompressed());</span><br><span class=line> } <span class=keyword>catch</span> (Exception e) {</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">RemotingCommandException</span>(<span class=string>"Failed to decode RegisterBrokerBody"</span>, e);</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> registerBrokerBody.getTopicConfigSerializeWrapper().getDataVersion().setCounter(<span class=keyword>new</span> <span class="title class_">AtomicLong</span>(<span class=number>0</span>));</span><br><span class=line> registerBrokerBody.getTopicConfigSerializeWrapper().getDataVersion().setTimestamp(<span class=number>0</span>);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=type>RegisterBrokerResult</span> <span class=variable>result</span> <span class=operator>=</span> <span class=built_in>this</span>.namesrvController.getRouteInfoManager().registerBroker(</span><br><span class=line> requestHeader.getClusterName(),</span><br><span class=line> requestHeader.getBrokerAddr(),</span><br><span class=line> requestHeader.getBrokerName(),</span><br><span class=line> requestHeader.getBrokerId(),</span><br><span class=line> requestHeader.getHaServerAddr(),</span><br><span class=line> registerBrokerBody.getTopicConfigSerializeWrapper(),</span><br><span class=line> registerBrokerBody.getFilterServerList(),</span><br><span class=line> ctx.channel());</span><br><span class=line></span><br><span class=line> responseHeader.setHaServerAddr(result.getHaServerAddr());</span><br><span class=line> responseHeader.setMasterAddr(result.getMasterAddr());</span><br><span class=line></span><br><span class=line> <span class=type>byte</span>[] jsonValue = <span class=built_in>this</span>.namesrvController.getKvConfigManager().getKVListByNamespace(NamesrvUtil.NAMESPACE_ORDER_TOPIC_CONFIG);</span><br><span class=line> response.setBody(jsonValue);</span><br><span class=line></span><br><span class=line> response.setCode(ResponseCode.SUCCESS);</span><br><span class=line> response.setRemark(<span class=literal>null</span>);</span><br><span class=line> <span class=keyword>return</span> response;</span><br><span class=line>}</span><br></pre></table></figure><p>可以看到主要的逻辑还是在<code>org.apache.rocketmq.namesrv.routeinfo.RouteInfoManager#registerBroker</code>这个方法里<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br><span class=line>49</span><br><span class=line>50</span><br><span class=line>51</span><br><span class=line>52</span><br><span class=line>53</span><br><span class=line>54</span><br><span class=line>55</span><br><span class=line>56</span><br><span class=line>57</span><br><span class=line>58</span><br><span class=line>59</span><br><span class=line>60</span><br><span class=line>61</span><br><span class=line>62</span><br><span class=line>63</span><br><span class=line>64</span><br><span class=line>65</span><br><span class=line>66</span><br><span class=line>67</span><br><span class=line>68</span><br><span class=line>69</span><br><span class=line>70</span><br><span class=line>71</span><br><span class=line>72</span><br><span class=line>73</span><br><span class=line>74</span><br><span class=line>75</span><br><span class=line>76</span><br><span class=line>77</span><br><span class=line>78</span><br><span class=line>79</span><br><span class=line>80</span><br><span class=line>81</span><br><span class=line>82</span><br><span class=line>83</span><br><span class=line>84</span><br><span class=line>85</span><br><span class=line>86</span><br><span class=line>87</span><br><span class=line>88</span><br><span class=line>89</span><br><span class=line>90</span><br><span class=line>91</span><br><span class=line>92</span><br><span class=line>93</span><br><span class=line>94</span><br><span class=line>95</span><br><span class=line>96</span><br><span class=line>97</span><br><span class=line>98</span><br><span class=line>99</span><br><span class=line>100</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> RegisterBrokerResult <span class="title function_">registerBroker</span><span class=params>(</span></span><br><span class=line><span class=params> <span class=keyword>final</span> String clusterName,</span></span><br><span class=line><span class=params> <span class=keyword>final</span> String brokerAddr,</span></span><br><span class=line><span class=params> <span class=keyword>final</span> String brokerName,</span></span><br><span class=line><span class=params> <span class=keyword>final</span> <span class=type>long</span> brokerId,</span></span><br><span class=line><span class=params> <span class=keyword>final</span> String haServerAddr,</span></span><br><span class=line><span class=params> <span class=keyword>final</span> TopicConfigSerializeWrapper topicConfigWrapper,</span></span><br><span class=line><span class=params> <span class=keyword>final</span> List&LTString> filterServerList,</span></span><br><span class=line><span class=params> <span class=keyword>final</span> Channel channel)</span> {</span><br><span class=line> <span class=type>RegisterBrokerResult</span> <span class=variable>result</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">RegisterBrokerResult</span>();</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=built_in>this</span>.lock.writeLock().lockInterruptibly();</span><br><span class=line></span><br><span class=line> <span class=comment>// 更新这个clusterAddrTable</span></span><br><span class=line> Set&LTString> brokerNames = <span class=built_in>this</span>.clusterAddrTable.get(clusterName);</span><br><span class=line> <span class=keyword>if</span> (<span class=literal>null</span> == brokerNames) {</span><br><span class=line> brokerNames = <span class=keyword>new</span> <span class="title class_">HashSet</span>&LTString>();</span><br><span class=line> <span class=built_in>this</span>.clusterAddrTable.put(clusterName, brokerNames);</span><br><span class=line> }</span><br><span class=line> brokerNames.add(brokerName);</span><br><span class=line></span><br><span class=line> <span class=type>boolean</span> <span class=variable>registerFirst</span> <span class=operator>=</span> <span class=literal>false</span>;</span><br><span class=line></span><br><span class=line> <span class=comment>// 更新brokerAddrTable</span></span><br><span class=line> <span class=type>BrokerData</span> <span class=variable>brokerData</span> <span class=operator>=</span> <span class=built_in>this</span>.brokerAddrTable.get(brokerName);</span><br><span class=line> <span class=keyword>if</span> (<span class=literal>null</span> == brokerData) {</span><br><span class=line> registerFirst = <span class=literal>true</span>;</span><br><span class=line> brokerData = <span class=keyword>new</span> <span class="title class_">BrokerData</span>(clusterName, brokerName, <span class=keyword>new</span> <span class="title class_">HashMap</span>&LTLong, String>());</span><br><span class=line> <span class=built_in>this</span>.brokerAddrTable.put(brokerName, brokerData);</span><br><span class=line> }</span><br><span class=line> Map&LTLong, String> brokerAddrsMap = brokerData.getBrokerAddrs();</span><br><span class=line> <span class=comment>//Switch slave to master: first remove &LT1, IP:PORT> in namesrv, then add &LT0, IP:PORT></span></span><br><span class=line> <span class=comment>//The same IP:PORT must only have one record in brokerAddrTable</span></span><br><span class=line> Iterator&LTEntry&LTLong, String>> it = brokerAddrsMap.entrySet().iterator();</span><br><span class=line> <span class=keyword>while</span> (it.hasNext()) {</span><br><span class=line> Entry&LTLong, String> item = it.next();</span><br><span class=line> <span class=keyword>if</span> (<span class=literal>null</span> != brokerAddr && brokerAddr.equals(item.getValue()) && brokerId != item.getKey()) {</span><br><span class=line> it.remove();</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=type>String</span> <span class=variable>oldAddr</span> <span class=operator>=</span> brokerData.getBrokerAddrs().put(brokerId, brokerAddr);</span><br><span class=line> registerFirst = registerFirst || (<span class=literal>null</span> == oldAddr);</span><br><span class=line></span><br><span class=line> <span class=comment>// 更新了org.apache.rocketmq.namesrv.routeinfo.RouteInfoManager#topicQueueTable中的数据</span></span><br><span class=line> <span class=keyword>if</span> (<span class=literal>null</span> != topicConfigWrapper</span><br><span class=line> && MixAll.MASTER_ID == brokerId) {</span><br><span class=line> <span class=keyword>if</span> (<span class=built_in>this</span>.isBrokerTopicConfigChanged(brokerAddr, topicConfigWrapper.getDataVersion())</span><br><span class=line> || registerFirst) {</span><br><span class=line> ConcurrentMap&LTString, TopicConfig> tcTable =</span><br><span class=line> topicConfigWrapper.getTopicConfigTable();</span><br><span class=line> <span class=keyword>if</span> (tcTable != <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>for</span> (Map.Entry&LTString, TopicConfig> entry : tcTable.entrySet()) {</span><br><span class=line> <span class=built_in>this</span>.createAndUpdateQueueData(brokerName, entry.getValue());</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// 更新活跃broker信息</span></span><br><span class=line> <span class=type>BrokerLiveInfo</span> <span class=variable>prevBrokerLiveInfo</span> <span class=operator>=</span> <span class=built_in>this</span>.brokerLiveTable.put(brokerAddr,</span><br><span class=line> <span class=keyword>new</span> <span class="title class_">BrokerLiveInfo</span>(</span><br><span class=line> System.currentTimeMillis(),</span><br><span class=line> topicConfigWrapper.getDataVersion(),</span><br><span class=line> channel,</span><br><span class=line> haServerAddr));</span><br><span class=line> <span class=keyword>if</span> (<span class=literal>null</span> == prevBrokerLiveInfo) {</span><br><span class=line> log.info(<span class=string>"new broker registered, {} HAServer: {}"</span>, brokerAddr, haServerAddr);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// 处理filter</span></span><br><span class=line> <span class=keyword>if</span> (filterServerList != <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>if</span> (filterServerList.isEmpty()) {</span><br><span class=line> <span class=built_in>this</span>.filterServerTable.remove(brokerAddr);</span><br><span class=line> } <span class=keyword>else</span> {</span><br><span class=line> <span class=built_in>this</span>.filterServerTable.put(brokerAddr, filterServerList);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// 当当前broker非master时返回master信息</span></span><br><span class=line> <span class=keyword>if</span> (MixAll.MASTER_ID != brokerId) {</span><br><span class=line> <span class=type>String</span> <span class=variable>masterAddr</span> <span class=operator>=</span> brokerData.getBrokerAddrs().get(MixAll.MASTER_ID);</span><br><span class=line> <span class=keyword>if</span> (masterAddr != <span class=literal>null</span>) {</span><br><span class=line> <span class=type>BrokerLiveInfo</span> <span class=variable>brokerLiveInfo</span> <span class=operator>=</span> <span class=built_in>this</span>.brokerLiveTable.get(masterAddr);</span><br><span class=line> <span class=keyword>if</span> (brokerLiveInfo != <span class=literal>null</span>) {</span><br><span class=line> result.setHaServerAddr(brokerLiveInfo.getHaServerAddr());</span><br><span class=line> result.setMasterAddr(masterAddr);</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>finally</span> {</span><br><span class=line> <span class=built_in>this</span>.lock.writeLock().unlock();</span><br><span class=line> }</span><br><span class=line> } <span class=keyword>catch</span> (Exception e) {</span><br><span class=line> log.error(<span class=string>"registerBroker Exception"</span>, e);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=keyword>return</span> result;</span><br><span class=line> }</span><br></pre></table></figure><p>这个是注册 broker 的逻辑,再看下根据 topic 获取 broker 信息和 topic 信息,<code>org.apache.rocketmq.namesrv.processor.DefaultRequestProcessor#getRouteInfoByTopic</code> 主要是这个方法的逻辑<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></pre><td class=code><pre><span class=line><span class=keyword>public</span> RemotingCommand <span class="title function_">getRouteInfoByTopic</span><span class=params>(ChannelHandlerContext ctx,</span></span><br><span class=line><span class=params> RemotingCommand request)</span> <span class=keyword>throws</span> RemotingCommandException {</span><br><span class=line> <span class=keyword>final</span> <span class=type>RemotingCommand</span> <span class=variable>response</span> <span class=operator>=</span> RemotingCommand.createResponseCommand(<span class=literal>null</span>);</span><br><span class=line> <span class=keyword>final</span> <span class=type>GetRouteInfoRequestHeader</span> <span class=variable>requestHeader</span> <span class=operator>=</span></span><br><span class=line> (GetRouteInfoRequestHeader) request.decodeCommandCustomHeader(GetRouteInfoRequestHeader.class);</span><br><span class=line></span><br><span class=line> <span class=type>TopicRouteData</span> <span class=variable>topicRouteData</span> <span class=operator>=</span> <span class=built_in>this</span>.namesrvController.getRouteInfoManager().pickupTopicRouteData(requestHeader.getTopic());</span><br><span class=line></span><br><span class=line> <span class=keyword>if</span> (topicRouteData != <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>if</span> (<span class=built_in>this</span>.namesrvController.getNamesrvConfig().isOrderMessageEnable()) {</span><br><span class=line> <span class=type>String</span> <span class=variable>orderTopicConf</span> <span class=operator>=</span></span><br><span class=line> <span class=built_in>this</span>.namesrvController.getKvConfigManager().getKVConfig(NamesrvUtil.NAMESPACE_ORDER_TOPIC_CONFIG,</span><br><span class=line> requestHeader.getTopic());</span><br><span class=line> topicRouteData.setOrderTopicConf(orderTopicConf);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=type>byte</span>[] content = topicRouteData.encode();</span><br><span class=line> response.setBody(content);</span><br><span class=line> response.setCode(ResponseCode.SUCCESS);</span><br><span class=line> response.setRemark(<span class=literal>null</span>);</span><br><span class=line> <span class=keyword>return</span> response;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> response.setCode(ResponseCode.TOPIC_NOT_EXIST);</span><br><span class=line> response.setRemark(<span class=string>"No topic route info in name server for the topic: "</span> + requestHeader.getTopic()</span><br><span class=line> + FAQUrl.suggestTodo(FAQUrl.APPLY_TOPIC_URL));</span><br><span class=line> <span class=keyword>return</span> response;</span><br><span class=line> }</span><br></pre></table></figure><p>首先调用<code>org.apache.rocketmq.namesrv.routeinfo.RouteInfoManager#pickupTopicRouteData</code>从<code>org.apache.rocketmq.namesrv.routeinfo.RouteInfoManager#topicQueueTable</code>获取到<code>org.apache.rocketmq.common.protocol.route.QueueData</code>这里面存了 brokerName,再通过<code>org.apache.rocketmq.namesrv.routeinfo.RouteInfoManager#brokerAddrTable</code>里获取到 broker 的地址信息等,然后再获取 orderMessage 的配置。<p>简要分析了下 RocketMQ 的 NameServer 的代码,比较粗粒度。</div><footer class=post-footer><div class=reward-container><div>请我一杯咖啡吧!</div><button>赞赏</button><div class=post-reward><div><img alt="Nicksxs 微信" src=https://i.loli.net/2020/01/12/NUlWanT31E8LQGx.png><span>微信</span></div><div><img alt="Nicksxs 支付宝" src=https://ooo.0o0.ooo/2016/08/17/57b421e773057.jpg><span>支付宝</span></div></div></div><div class=post-copyright><ul><li class=post-copyright-author><strong>本文作者: </strong>Nicksxs<li class=post-copyright-link><strong>本文链接:</strong> <a title="聊一下 RocketMQ 的 NameServer 源码" 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