RocketMQ源码阅读（3）-Broker启动

1、首先找到BrokerStartup启动的主类

        该类在broker模块中，类全路径为org.apache.rocketmq.broker.BrokerStartup，我们在启动Broker的时候只需要运行该类就行了。

2、从main方法入口看broker启动都做了哪些事情？

public static void main(String[] args) {
    start(createBrokerController(args));
}

public static BrokerController createBrokerController(String[] args) {
        System.setProperty(RemotingCommand.REMOTING_VERSION_KEY, Integer.toString(MQVersion.CURRENT_VERSION));

        if (null == System.getProperty(NettySystemConfig.COM_ROCKETMQ_REMOTING_SOCKET_SNDBUF_SIZE)) {
            // 默认发送缓冲区大小
            NettySystemConfig.socketSndbufSize = 131072;
        }

        if (null == System.getProperty(NettySystemConfig.COM_ROCKETMQ_REMOTING_SOCKET_RCVBUF_SIZE)) {
            // 默认接收缓冲区大小
            NettySystemConfig.socketRcvbufSize = 131072;
        }

        try {
            //PackageConflictDetect.detectFastjson();
            Options options = ServerUtil.buildCommandlineOptions(new Options());
            commandLine = ServerUtil.parseCmdLine("mqbroker", args, buildCommandlineOptions(options),
                new PosixParser());
            if (null == commandLine) {
                System.exit(-1);
            }

            final BrokerConfig brokerConfig = new BrokerConfig();
            final NettyServerConfig nettyServerConfig = new NettyServerConfig();
            final NettyClientConfig nettyClientConfig = new NettyClientConfig();

            nettyClientConfig.setUseTLS(Boolean.parseBoolean(System.getProperty(TLS_ENABLE,
                String.valueOf(TlsSystemConfig.tlsMode == TlsMode.ENFORCING))));
            nettyServerConfig.setListenPort(10911);
            final MessageStoreConfig messageStoreConfig = new MessageStoreConfig();

            if (BrokerRole.SLAVE == messageStoreConfig.getBrokerRole()) {
                int ratio = messageStoreConfig.getAccessMessageInMemoryMaxRatio() - 10;
                messageStoreConfig.setAccessMessageInMemoryMaxRatio(ratio);
            }

            // -c configFile 通过-c命令指定配置文件路径
            if (commandLine.hasOption('c')) {
                String file = commandLine.getOptionValue('c');
                if (file != null) {
                    configFile = file;
                    InputStream in = new BufferedInputStream(new FileInputStream(file));
                    properties = new Properties();
                    properties.load(in);

                    properties2SystemEnv(properties);
                    MixAll.properties2Object(properties, brokerConfig);
                    MixAll.properties2Object(properties, nettyServerConfig);
                    MixAll.properties2Object(properties, nettyClientConfig);
                    MixAll.properties2Object(properties, messageStoreConfig);

                    BrokerPathConfigHelper.setBrokerConfigPath(file);
                    in.close();
                }
            }

            // 将参数封装到brokerConfig实体上
            MixAll.properties2Object(ServerUtil.commandLine2Properties(commandLine), brokerConfig);

            if (null == brokerConfig.getRocketmqHome()) {
                System.out.printf("Please set the %s variable in your environment to match the location of the RocketMQ installation", MixAll.ROCKETMQ_HOME_ENV);
                System.exit(-2);
            }

            String namesrvAddr = brokerConfig.getNamesrvAddr();
            if (null != namesrvAddr) {
                try {
                    String[] addrArray = namesrvAddr.split(";");
                    for (String addr : addrArray) {
                        RemotingUtil.string2SocketAddress(addr);
                    }
                } catch (Exception e) {
                    System.out.printf(
                        "The Name Server Address[%s] illegal, please set it as follows, \"127.0.0.1:9876;192.168.0.1:9876\"%n",
                        namesrvAddr);
                    System.exit(-3);
                }
            }

            // 根据broker角色设置brokerId值，0为master，大于0为slave
            switch (messageStoreConfig.getBrokerRole()) {
                case ASYNC_MASTER:
                case SYNC_MASTER:
                    brokerConfig.setBrokerId(MixAll.MASTER_ID);
                    break;
                case SLAVE:
                    if (brokerConfig.getBrokerId() <= 0) {
                        System.out.printf("Slave's brokerId must be > 0");
                        System.exit(-3);
                    }

                    break;
                default:
                    break;
            }

            //
            messageStoreConfig.setHaListenPort(nettyServerConfig.getListenPort() + 1);
            // 日志相关配置
            LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
            JoranConfigurator configurator = new JoranConfigurator();
            configurator.setContext(lc);
            lc.reset();
            configurator.doConfigure(brokerConfig.getRocketmqHome() + "/conf/logback_broker.xml");

            // -p选项可以打印所有的配置项
            if (commandLine.hasOption('p')) {
                InternalLogger console = InternalLoggerFactory.getLogger(LoggerName.BROKER_CONSOLE_NAME);
                MixAll.printObjectProperties(console, brokerConfig);
                MixAll.printObjectProperties(console, nettyServerConfig);
                MixAll.printObjectProperties(console, nettyClientConfig);
                MixAll.printObjectProperties(console, messageStoreConfig);
                System.exit(0);
            }
            // -m选项打印部分配置，属性上有ImportantField注解的属性
            else if (commandLine.hasOption('m')) {
                InternalLogger console = InternalLoggerFactory.getLogger(LoggerName.BROKER_CONSOLE_NAME);
                MixAll.printObjectProperties(console, brokerConfig, true);
                MixAll.printObjectProperties(console, nettyServerConfig, true);
                MixAll.printObjectProperties(console, nettyClientConfig, true);
                MixAll.printObjectProperties(console, messageStoreConfig, true);
                System.exit(0);
            }
            // 日志打印BrokerConfig、NettyServerConfig、NettyClientConfig和MessageStoreConfig配置
            log = InternalLoggerFactory.getLogger(LoggerName.BROKER_LOGGER_NAME);
            MixAll.printObjectProperties(log, brokerConfig);
            MixAll.printObjectProperties(log, nettyServerConfig);
            MixAll.printObjectProperties(log, nettyClientConfig);
            MixAll.printObjectProperties(log, messageStoreConfig);

            final BrokerController controller = new BrokerController(
                brokerConfig,
                nettyServerConfig,
                nettyClientConfig,
                messageStoreConfig);
            // remember all configs to prevent discard
            controller.getConfiguration().registerConfig(properties);

            boolean initResult = controller.initialize();
            if (!initResult) {
                // 初始化BrokerController失败，关闭一些资源
                controller.shutdown();
                System.exit(-3);
            }

            // 添加关闭钩子，在停止系统时关闭控制器
            Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {
                private volatile boolean hasShutdown = false;
                private AtomicInteger shutdownTimes = new AtomicInteger(0);

                @Override
                public void run() {
                    synchronized (this) {
                        log.info("Shutdown hook was invoked, {}", this.shutdownTimes.incrementAndGet());
                        if (!this.hasShutdown) {
                            this.hasShutdown = true;
                            long beginTime = System.currentTimeMillis();
                            controller.shutdown();
                            long consumingTimeTotal = System.currentTimeMillis() - beginTime;
                            log.info("Shutdown hook over, consuming total time(ms): {}", consumingTimeTotal);
                        }
                    }
                }
            }, "ShutdownHook"));

            return controller;
        } catch (Throwable e) {
            e.printStackTrace();
            System.exit(-1);
        }

        return null;
    }

BrokerController#构造函数

public BrokerController(
        final BrokerConfig brokerConfig,
        final NettyServerConfig nettyServerConfig,
        final NettyClientConfig nettyClientConfig,
        final MessageStoreConfig messageStoreConfig
    ) {
        this.brokerConfig = brokerConfig;
        this.nettyServerConfig = nettyServerConfig;
        this.nettyClientConfig = nettyClientConfig;
        this.messageStoreConfig = messageStoreConfig;
        this.consumerOffsetManager = new ConsumerOffsetManager(this);
        this.topicConfigManager = new TopicConfigManager(this);
        this.pullMessageProcessor = new PullMessageProcessor(this);
        this.pullRequestHoldService = new PullRequestHoldService(this);
        this.messageArrivingListener = new NotifyMessageArrivingListener(this.pullRequestHoldService);
        this.consumerIdsChangeListener = new DefaultConsumerIdsChangeListener(this);
        this.consumerManager = new ConsumerManager(this.consumerIdsChangeListener);
        this.consumerFilterManager = new ConsumerFilterManager(this);
        this.producerManager = new ProducerManager();
        this.clientHousekeepingService = new ClientHousekeepingService(this);
        this.broker2Client = new Broker2Client(this);
        this.subscriptionGroupManager = new SubscriptionGroupManager(this);
        this.brokerOuterAPI = new BrokerOuterAPI(nettyClientConfig);
        this.filterServerManager = new FilterServerManager(this);

        this.slaveSynchronize = new SlaveSynchronize(this);

        this.sendThreadPoolQueue = new LinkedBlockingQueue(this.brokerConfig.getSendThreadPoolQueueCapacity());
        this.pullThreadPoolQueue = new LinkedBlockingQueue(this.brokerConfig.getPullThreadPoolQueueCapacity());
        this.queryThreadPoolQueue = new LinkedBlockingQueue(this.brokerConfig.getQueryThreadPoolQueueCapacity());
        this.clientManagerThreadPoolQueue = new LinkedBlockingQueue(this.brokerConfig.getClientManagerThreadPoolQueueCapacity());
        this.consumerManagerThreadPoolQueue = new LinkedBlockingQueue(this.brokerConfig.getConsumerManagerThreadPoolQueueCapacity());
        this.heartbeatThreadPoolQueue = new LinkedBlockingQueue(this.brokerConfig.getHeartbeatThreadPoolQueueCapacity());
        this.endTransactionThreadPoolQueue = new LinkedBlockingQueue(this.brokerConfig.getEndTransactionPoolQueueCapacity());

        this.brokerStatsManager = new BrokerStatsManager(this.brokerConfig.getBrokerClusterName());
        this.setStoreHost(new InetSocketAddress(this.getBrokerConfig().getBrokerIP1(), this.getNettyServerConfig().getListenPort()));

        this.brokerFastFailure = new BrokerFastFailure(this);
        this.configuration = new Configuration(
            log,
            BrokerPathConfigHelper.getBrokerConfigPath(),
            this.brokerConfig, this.nettyServerConfig, this.nettyClientConfig, this.messageStoreConfig
        );
    }

BrokerController#initialize

public boolean initialize() throws CloneNotSupportedException {
        // 加载文件~/store/config/topics.json
        boolean result = this.topicConfigManager.load();

        // 加载文件~/store/config/consumerOffset.json
        result = result && this.consumerOffsetManager.load();
        // 加载文件~/store/config/subscriptionGroup.json
        result = result && this.subscriptionGroupManager.load();
        // 加载文件~/store/config/consumerFilter.json
        result = result && this.consumerFilterManager.load();

        if (result) {
            try {
                this.messageStore =
                    new DefaultMessageStore(this.messageStoreConfig, this.brokerStatsManager, this.messageArrivingListener,
                        this.brokerConfig);
                if (messageStoreConfig.isEnableDLegerCommitLog()) {
                    DLedgerRoleChangeHandler roleChangeHandler = new DLedgerRoleChangeHandler(this, (DefaultMessageStore) messageStore);
                    ((DLedgerCommitLog)((DefaultMessageStore) messageStore).getCommitLog()).getdLedgerServer().getdLedgerLeaderElector().addRoleChangeHandler(roleChangeHandler);
                }
                this.brokerStats = new BrokerStats((DefaultMessageStore) this.messageStore);
                //load plugin
                MessageStorePluginContext context = new MessageStorePluginContext(messageStoreConfig, brokerStatsManager, messageArrivingListener, brokerConfig);
                this.messageStore = MessageStoreFactory.build(context, this.messageStore);
                this.messageStore.getDispatcherList().addFirst(new CommitLogDispatcherCalcBitMap(this.brokerConfig, this.consumerFilterManager));
            } catch (IOException e) {
                result = false;
                log.error("Failed to initialize", e);
            }
        }

        // 加载消息存储 DefaultMessageStore
        result = result && this.messageStore.load();

        if (result) {
            this.remotingServer = new NettyRemotingServer(this.nettyServerConfig, this.clientHousekeepingService);
            NettyServerConfig fastConfig = (NettyServerConfig) this.nettyServerConfig.clone();
            fastConfig.setListenPort(nettyServerConfig.getListenPort() - 2);
            this.fastRemotingServer = new NettyRemotingServer(fastConfig, this.clientHousekeepingService);

            // 发送消息线程池
            this.sendMessageExecutor = new BrokerFixedThreadPoolExecutor(
                this.brokerConfig.getSendMessageThreadPoolNums(),
                this.brokerConfig.getSendMessageThreadPoolNums(),
                1000 * 60,
                TimeUnit.MILLISECONDS,
                this.sendThreadPoolQueue,
                new ThreadFactoryImpl("SendMessageThread_"));

            // 拉消息线程池
            this.pullMessageExecutor = new BrokerFixedThreadPoolExecutor(
                this.brokerConfig.getPullMessageThreadPoolNums(),
                this.brokerConfig.getPullMessageThreadPoolNums(),
                1000 * 60,
                TimeUnit.MILLISECONDS,
                this.pullThreadPoolQueue,
                new ThreadFactoryImpl("PullMessageThread_"));

            // 查询消息线程池
            this.queryMessageExecutor = new BrokerFixedThreadPoolExecutor(
                this.brokerConfig.getQueryMessageThreadPoolNums(),
                this.brokerConfig.getQueryMessageThreadPoolNums(),
                1000 * 60,
                TimeUnit.MILLISECONDS,
                this.queryThreadPoolQueue,
                new ThreadFactoryImpl("QueryMessageThread_"));

            // Broker管理线程池
            this.adminBrokerExecutor =
                Executors.newFixedThreadPool(this.brokerConfig.getAdminBrokerThreadPoolNums(), new ThreadFactoryImpl(
                    "AdminBrokerThread_"));

            // 客户端管理线程池
            this.clientManageExecutor = new ThreadPoolExecutor(
                this.brokerConfig.getClientManageThreadPoolNums(),
                this.brokerConfig.getClientManageThreadPoolNums(),
                1000 * 60,
                TimeUnit.MILLISECONDS,
                this.clientManagerThreadPoolQueue,
                new ThreadFactoryImpl("ClientManageThread_"));

            // 心跳管理线程池
            this.heartbeatExecutor = new BrokerFixedThreadPoolExecutor(
                this.brokerConfig.getHeartbeatThreadPoolNums(),
                this.brokerConfig.getHeartbeatThreadPoolNums(),
                1000 * 60,
                TimeUnit.MILLISECONDS,
                this.heartbeatThreadPoolQueue,
                new ThreadFactoryImpl("HeartbeatThread_", true));

            // 结束事物线程池
            this.endTransactionExecutor = new BrokerFixedThreadPoolExecutor(
                this.brokerConfig.getEndTransactionThreadPoolNums(),
                this.brokerConfig.getEndTransactionThreadPoolNums(),
                1000 * 60,
                TimeUnit.MILLISECONDS,
                this.endTransactionThreadPoolQueue,
                new ThreadFactoryImpl("EndTransactionThread_"));

            // 消费者管理线程池
            this.consumerManageExecutor =
                Executors.newFixedThreadPool(this.brokerConfig.getConsumerManageThreadPoolNums(), new ThreadFactoryImpl(
                    "ConsumerManageThread_"));

            // 注册各种处理器，大概分为消息发送、消息拉取、消息查询、客户端管理、消费者管理、事务结束和默认处理器这些种
            this.registerProcessor();

            final long initialDelay = UtilAll.computeNextMorningTimeMillis() - System.currentTimeMillis();
            final long period = 1000 * 60 * 60 * 24;
            this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
                @Override
                public void run() {
                    try {
                        // 每天打印一次GET/PUT消息的总量
                        BrokerController.this.getBrokerStats().record();
                    } catch (Throwable e) {
                        log.error("schedule record error.", e);
                    }
                }
            }, initialDelay, period, TimeUnit.MILLISECONDS);

            this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
                @Override
                public void run() {
                    try {
                        // 定时持久化消费者偏移量，持久化文件为~/store/config/consumerOffset.json
                        BrokerController.this.consumerOffsetManager.persist();
                    } catch (Throwable e) {
                        log.error("schedule persist consumerOffset error.", e);
                    }
                }
            }, 1000 * 10, this.brokerConfig.getFlushConsumerOffsetInterval(), TimeUnit.MILLISECONDS);

            this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
                @Override
                public void run() {
                    try {
                        // 定时持久化消费者过滤器，持久化文件为~/store/config/consumerFilter.json
                        BrokerController.this.consumerFilterManager.persist();
                    } catch (Throwable e) {
                        log.error("schedule persist consumer filter error.", e);
                    }
                }
            }, 1000 * 10, 1000 * 10, TimeUnit.MILLISECONDS);

            this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
                @Override
                public void run() {
                    try {
                        // 保护broker，这里的操作主要是在开启disableConsumeIfConsumerReadSlowly配置的情况下，禁用掉消费慢的consumer，从而保护broker
                        BrokerController.this.protectBroker();
                    } catch (Throwable e) {
                        log.error("protectBroker error.", e);
                    }
                }
            }, 3, 3, TimeUnit.MINUTES);

            this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
                @Override
                public void run() {
                    try {
                        // 定时打印水位，主要是一些核心队列状态的打印，如当前队列大小，队列头部任务从创建到现在的时间等
                        BrokerController.this.printWaterMark();
                    } catch (Throwable e) {
                        log.error("printWaterMark error.", e);
                    }
                }
            }, 10, 1, TimeUnit.SECONDS);

            this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
                @Override
                public void run() {
                    try {
                        // 定时打印已存储在提交日志中但尚未调度到消费队列的字节数
                        log.info("dispatch behind commit log {} bytes", BrokerController.this.getMessageStore().dispatchBehindBytes());
                    } catch (Throwable e) {
                        log.error("schedule dispatchBehindBytes error.", e);
                    }
                }
            }, 1000 * 10, 1000 * 60, TimeUnit.MILLISECONDS);

            if (this.brokerConfig.getNamesrvAddr() != null) {
                // 指定了namesrvAddr则更新NameServer的地址
                this.brokerOuterAPI.updateNameServerAddressList(this.brokerConfig.getNamesrvAddr());
                log.info("Set user specified name server address: {}", this.brokerConfig.getNamesrvAddr());
            } else if (this.brokerConfig.isFetchNamesrvAddrByAddressServer()) {
                this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            // 如果指定了通过地址服务器获取地址，则定时获取并更新NameServer地址
                            BrokerController.this.brokerOuterAPI.fetchNameServerAddr();
                        } catch (Throwable e) {
                            log.error("ScheduledTask fetchNameServerAddr exception", e);
                        }
                    }
                }, 1000 * 10, 1000 * 60 * 2, TimeUnit.MILLISECONDS);
            }

            if (!messageStoreConfig.isEnableDLegerCommitLog()) {
                // 如果指定了haMasterAddress，则不需要定期更新haMasterAddress
                if (BrokerRole.SLAVE == this.messageStoreConfig.getBrokerRole()) {
                    if (this.messageStoreConfig.getHaMasterAddress() != null && this.messageStoreConfig.getHaMasterAddress().length() >= 6) {
                        this.messageStore.updateHaMasterAddress(this.messageStoreConfig.getHaMasterAddress());
                        this.updateMasterHAServerAddrPeriodically = false;
                    } else {
                        this.updateMasterHAServerAddrPeriodically = true;
                    }
                } else {
                    this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
                        @Override
                        public void run() {
                            try {
                                // 定时打印slave落后的字节数（commit log）
                                BrokerController.this.printMasterAndSlaveDiff();
                            } catch (Throwable e) {
                                log.error("schedule printMasterAndSlaveDiff error.", e);
                            }
                        }
                    }, 1000 * 10, 1000 * 60, TimeUnit.MILLISECONDS);
                }
            }

            if (TlsSystemConfig.tlsMode != TlsMode.DISABLED) {
                // Register a listener to reload SslContext
                try {
                    fileWatchService = new FileWatchService(
                        new String[] {
                            TlsSystemConfig.tlsServerCertPath,
                            TlsSystemConfig.tlsServerKeyPath,
                            TlsSystemConfig.tlsServerTrustCertPath
                        },
                        new FileWatchService.Listener() {
                            boolean certChanged, keyChanged = false;

                            @Override
                            public void onChanged(String path) {
                                if (path.equals(TlsSystemConfig.tlsServerTrustCertPath)) {
                                    log.info("The trust certificate changed, reload the ssl context");
                                    reloadServerSslContext();
                                }
                                if (path.equals(TlsSystemConfig.tlsServerCertPath)) {
                                    certChanged = true;
                                }
                                if (path.equals(TlsSystemConfig.tlsServerKeyPath)) {
                                    keyChanged = true;
                                }
                                if (certChanged && keyChanged) {
                                    log.info("The certificate and private key changed, reload the ssl context");
                                    certChanged = keyChanged = false;
                                    reloadServerSslContext();
                                }
                            }

                            private void reloadServerSslContext() {
                                ((NettyRemotingServer) remotingServer).loadSslContext();
                                ((NettyRemotingServer) fastRemotingServer).loadSslContext();
                            }
                        });
                } catch (Exception e) {
                    log.warn("FileWatchService created error, can't load the certificate dynamically");
                }
            }
            // 实例化事务需要的三个变量，transactionalMessageService、transactionalMessageCheckListener、transactionalMessageCheckService
            initialTransaction();
            // 如果启动了ACL权限检查，则实例化AccessValidator并注册RPCHook在请求前使用AccessValidator进行权限校验
            initialAcl();
            // 实例化并注册RPCHook
            initialRpcHooks();
        }
        return result;
    }

DefaultMessageStore#load

public boolean load() {
        boolean result = true;

        try {
            // 判断~/store/abort文件是否存在，用于判断进程是否正常退出
            boolean lastExitOK = !this.isTempFileExist();
            log.info("last shutdown {}", lastExitOK ? "normally" : "abnormally");

            if (null != scheduleMessageService) {
                // 加载文件~/store/config/delayOffset.json
                // 将默认的延迟时间“1s 5s 10s 30s 1m 2m 3m 4m 5m 6m 7m 8m 9m 10m 20m 30m 1h 2h”转换为对应的毫秒数
                result = result && this.scheduleMessageService.load();
            }

            // load Commit Log
            // 加载~/store/commitlog目录下的所有文件，并标记每一个文件的写位置、刷新位置和提交位置（也就是commit log文件大小，默认1G）
            result = result && this.commitLog.load();

            // load Consume Queue
            // 加载~/store/consumequeue目录下的所有文件
            // 获取文件后构建ConsumeQueue，并设置topic、queueId、ConsumeQueue三者之间的关系
            // 同样标记每一个文件的写位置、刷新位置和提交位置
            result = result && this.loadConsumeQueue();

            if (result) {
                // 加载~/store/checkpoint文件，主要用于确定物理消息、逻辑消息、索引消息三个时间戳
                this.storeCheckpoint =
                    new StoreCheckpoint(StorePathConfigHelper.getStoreCheckpoint(this.messageStoreConfig.getStorePathRootDir()));
                // 加载~/store/index目录下的索引文件
                this.indexService.load(lastExitOK);
                // 恢复
                this.recover(lastExitOK);

                log.info("load over, and the max phy offset = {}", this.getMaxPhyOffset());
            }
        } catch (Exception e) {
            log.error("load exception", e);
            result = false;
        }

        if (!result) {
            // 如果初始化失败则删除预先分配好的映射文件
            this.allocateMappedFileService.shutdown();
        }

        return result;
    }



 private void recover(final boolean lastExitOK) {
        // 恢复消费队列，确定消费队列的最大物理偏移量，对应~/store/consumequeue/目录下面的内容
        long maxPhyOffsetOfConsumeQueue = this.recoverConsumeQueue();
        // 根据上次进程退出的结果判断采取正常/异常commit log恢复，对应~/store/commitlog目录下面的内容
        if (lastExitOK) {
            this.commitLog.recoverNormally(maxPhyOffsetOfConsumeQueue);
        } else {
            this.commitLog.recoverAbnormally(maxPhyOffsetOfConsumeQueue);
        }
        // 恢复topic队列
        this.recoverTopicQueueTable();
    }

BrokerController#start调用各个组件的start方法，并且向每个NameServer发起注册

public void start() throws Exception {
        if (this.messageStore != null) {
            this.messageStore.start();
        }
        if (this.remotingServer != null) {
            this.remotingServer.start();
        }
        if (this.fastRemotingServer != null) {
            this.fastRemotingServer.start();
        }
        if (this.fileWatchService != null) {
            this.fileWatchService.start();
        }
        if (this.brokerOuterAPI != null) {
            this.brokerOuterAPI.start();
        }
        if (this.pullRequestHoldService != null) {
            this.pullRequestHoldService.start();
        }
        if (this.clientHousekeepingService != null) {
            this.clientHousekeepingService.start();
        }
        if (this.filterServerManager != null) {
            this.filterServerManager.start();
        }
        if (!messageStoreConfig.isEnableDLegerCommitLog()) {
            startProcessorByHa(messageStoreConfig.getBrokerRole());
            handleSlaveSynchronize(messageStoreConfig.getBrokerRole());
        }


        // 启动的时候向每个NameServer发起注册
        this.registerBrokerAll(true, false, true);

        
        this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
            @Override
            public void run() {
                try {
                    // Broker会每隔30s向NameSrv更新自身topic信息
                    BrokerController.this.registerBrokerAll(true, false, brokerConfig.isForceRegister());
                } catch (Throwable e) {
                    log.error("registerBrokerAll Exception", e);
                }
            }
        }, 1000 * 10, Math.max(10000, Math.min(brokerConfig.getRegisterNameServerPeriod(), 60000)), TimeUnit.MILLISECONDS);

        if (this.brokerStatsManager != null) {
            this.brokerStatsManager.start();
        }

        if (this.brokerFastFailure != null) {
            this.brokerFastFailure.start();
        }
    }

3、Broker启动简图