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入口
-
核心流程
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BrokerController是如何被创建的
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Broker是如何注册到NameServer的
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registerBrokerAll
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doRegisterBrokerAll
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registerBrokerAll()
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总结
入口
Broker启动的源码入口是BrokerStartup.Java
核心流程
主要流程和NameServer启动有些类似
-
创建 BrokerController -
启动 BrokerController
public static void main(String[] args) {
start(createBrokerController(args));
}
public static BrokerController start(BrokerController controller) {
try {
controller.start();
String tip = "The broker[" + controller.getBrokerConfig().getBrokerName() + ", "
+ controller.getBrokerAddr() + "] boot success. serializeType=" + RemotingCommand.getSerializeTypeConfigInThisServer();
if (null != controller.getBrokerConfig().getNamesrvAddr()) {
tip += " and name server is " + controller.getBrokerConfig().getNamesrvAddr();
}
log.info(tip);
System.out.printf("%s%n", tip);
return controller;
} catch (Throwable e) {
e.printStackTrace();
System.exit(-1);
}
return null;
}
BrokerController是如何被创建的
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)) {
NettySystemConfig.socketSndbufSize = 131072;
}
// 设置socket 发送缓冲大小
if (null == System.getProperty(NettySystemConfig.COM_ROCKETMQ_REMOTING_SOCKET_RCVBUF_SIZE)) {
NettySystemConfig.socketRcvbufSize = 131072;
}
try {
//PackageConflictDetect.detectFastjson();
// 解析启动参数 args
Options options = ServerUtil.buildCommandlineOptions(new Options());
commandLine = ServerUtil.parseCmdLine("mqbroker", args, buildCommandlineOptions(options),
new PosixParser());
if (null == commandLine) {
System.exit(-1);
}
// Broker核心配置类
final BrokerConfig brokerConfig = new BrokerConfig();
// Netty服务器配置
final NettyServerConfig nettyServerConfig = new NettyServerConfig();
// Netty客户端配置TLS
final NettyClientConfig nettyClientConfig = new NettyClientConfig();
// 设置Netty客户端是否使用
nettyClientConfig.setUseTLS(Boolean.parseBoolean(System.getProperty(TLS_ENABLE,
String.valueOf(TlsSystemConfig.tlsMode == TlsMode.ENFORCING))));
// 设置Netty服务器监听端口为 10911
nettyServerConfig.setListenPort(10911);
// Broker 消息配置类
final MessageStoreConfig messageStoreConfig = new MessageStoreConfig();
// broker是否为 slave broker 如果是 则将 消息占用内存百度分 减10%, 默认40%,超过内存的消息将置换出内存
if (BrokerRole.SLAVE == messageStoreConfig.getBrokerRole()) {
int ratio = messageStoreConfig.getAccessMessageInMemoryMaxRatio() - 10;
messageStoreConfig.setAccessMessageInMemoryMaxRatio(ratio);
}
// 读取解析启动配置信息
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();
}
}
MixAll.properties2Object(ServerUtil.commandLine2Properties(commandLine), brokerConfig);
// 检查ROCKETMQ_HOME环境变量， 如果没有直接退出
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);
}
// 获取Nameserver地址，;分割解析为数组 因为Nameserver可能为集群，所以有多个
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);
}
}
// 判断Broker角色，作相应的处理 master有两种同步消息方式
switch (messageStoreConfig.getBrokerRole()) {
// 异步复制:生产者写入消息到Master后无需等待消息复制到slave即可返回，消息的复制由旁路线程进行异步复制
case ASYNC_MASTER:
/* 同步复制的方式，表现出来的是类似同步双写的策略。即Master写入完消息之后，需要等待Slave的复制成功。
注，这里只需要有一个Slave复制成功并成功应答即算成功，所以在这种模式下，如果有3个Slave，当生产者获得SEND_OK的应答时，
代表消息已经达到Maser和一个Slave（注：这里并不代表已经持久化到磁盘，而只能证明肯定到了PageCache，
是否能刷到磁盘取决于刷盘策略是同步刷盘还是异步刷盘），而还有两个Slave实际上是无法保证的，
并且这里也不支持配置，即不支持如“”同步半数以上”之类的设置 */
case SYNC_MASTER:
brokerConfig.setBrokerId(MixAll.MASTER_ID);
break;
/**
* 消息发送的状态除了SEND_OK外，还会多出以下的状态：
* FLUSH_SLAVE_TIMEOUT ： 同步到slave等待超时，即一直等Slave上报同步的进度，但过了超时时间都没有成功没有同步完。
* SLAVE_NOT_AVAILABLE：当前没有可用的Slave。注：如果slave落后master实在太多，
* 那个slave也会认为是暂时不可用的slave，直到它同步到接近的范围为止，
* 这个不可用的阈值由broker配置haSlaveFallbehindMax（默认是1024 * 1024 * 256）决定
*/
case SLAVE:
if (brokerConfig.getBrokerId() <= 0) {
System.out.printf("Slave's brokerId must be > 0");
System.exit(-3);
}
break;
default:
break;
}
// 是否基于dleger技术管理主从同步和CommitLog
if (messageStoreConfig.isEnableDLegerCommitLog()) {
brokerConfig.setBrokerId(-1);
}
// 设置HA监听端口
messageStoreConfig.setHaListenPort(nettyServerConfig.getListenPort() + 1);
// 日志相关
LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
JoranConfigurator configurator = new JoranConfigurator();
configurator.setContext(lc);
lc.reset();
configurator.doConfigure(brokerConfig.getRocketmqHome() + "/conf/logback_broker.xml");
// 打印启动参数信息
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);
} 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);
}
log = InternalLoggerFactory.getLogger(LoggerName.BROKER_LOGGER_NAME);
MixAll.printObjectProperties(log, brokerConfig);
MixAll.printObjectProperties(log, nettyServerConfig);
MixAll.printObjectProperties(log, nettyClientConfig);
MixAll.printObjectProperties(log, messageStoreConfig);
// 基于上面的配置参数 创建 BrokerController
final BrokerController controller = new BrokerController(
brokerConfig,
nettyServerConfig,
nettyClientConfig,
messageStoreConfig);
// remember all configs to prevent discard
controller.getConfiguration().registerConfig(properties);
// 初始化 BrokerController
boolean initResult = controller.initialize();
if (!initResult) {
controller.shutdown();
System.exit(-3);
}
// 钩子线程 JVM退出时打印消费时间
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;
}
上面代码可以看到主要是读取一些配置文件，根据配置文件设置不同的一些枚举状态，然后在上面代码中又有一个比较核心的方法
boolean initResult = controller.initialize();
我们进去看看
下面代码很长，可以简单过一下，这里先作一个总结吧 下面的代码主要是配置启动一些线程池，然后作内存持久化到磁盘的操作，然后就是一些Netty的配置，大致就是干了这些事。这里不用太注意细节，源码每个点都看懂太难了，我们主要是挑核心的看，下面代码我也作了一些注释
public boolean initialize() throws CloneNotSupportedException {
// 从磁盘中初始化 topicConfigManager
boolean result = this.topicConfigManager.load();
// 加载消费偏移
result = result && this.consumerOffsetManager.load();
// 加载消费组信息
result = result && this.subscriptionGroupManager.load();
// 加载过滤器配置
result = result && this.consumerFilterManager.load();
if (result) {
try {
// 创建消息存储管理组件,默认使用commitLog 管理磁盘消息
this.messageStore =
new DefaultMessageStore(this.messageStoreConfig, this.brokerStatsManager, this.messageArrivingListener,
this.brokerConfig);
// 如果使用Dleger 管理 commitlog 初始化相关信息
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);
}
}
result = result && this.messageStore.load();
if (result) {
// 启动Netty服务器
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);
this.sendMessageExecutor = new BrokerFixedThreadPoolExecutor(
this.brokerConfig.getSendMessageThreadPoolNums(),
this.brokerConfig.getSendMessageThreadPoolNums(),
1000 * 60,
TimeUnit.MILLISECONDS,
this.sendThreadPoolQueue,
new ThreadFactoryImpl("SendMessageThread_"));
this.pullMessageExecutor = new BrokerFixedThreadPoolExecutor(
this.brokerConfig.getPullMessageThreadPoolNums(),
this.brokerConfig.getPullMessageThreadPoolNums(),
1000 * 60,
TimeUnit.MILLISECONDS,
this.pullThreadPoolQueue,
new ThreadFactoryImpl("PullMessageThread_"));
this.replyMessageExecutor = new BrokerFixedThreadPoolExecutor(
this.brokerConfig.getProcessReplyMessageThreadPoolNums(),
this.brokerConfig.getProcessReplyMessageThreadPoolNums(),
1000 * 60,
TimeUnit.MILLISECONDS,
this.replyThreadPoolQueue,
new ThreadFactoryImpl("ProcessReplyMessageThread_"));
this.queryMessageExecutor = new BrokerFixedThreadPoolExecutor(
this.brokerConfig.getQueryMessageThreadPoolNums(),
this.brokerConfig.getQueryMessageThreadPoolNums(),
1000 * 60,
TimeUnit.MILLISECONDS,
this.queryThreadPoolQueue,
new ThreadFactoryImpl("QueryMessageThread_"));
this.adminBrokerExecutor =
Executors.newFixedThreadPool(this.brokerConfig.getAdminBrokerThreadPoolNums(), new ThreadFactoryImpl(
"AdminBrokerThread_"));
this.clientManageExecutor = new ThreadPoolExecutor(
this.brokerConfig.getClientManageThreadPoolNums(),
this.brokerConfig.getClientManageThreadPoolNums(),
1000 * 60,
TimeUnit.MILLISECONDS,
this.clientManagerThreadPoolQueue,
new ThreadFactoryImpl("ClientManageThread_"));
this.heartbeatExecutor = new BrokerFixedThreadPoolExecutor(
this.brokerConfig.getHeartbeatThreadPoolNums(),
this.brokerConfig.getHeartbeatThreadPoolNums(),
1000 * 60,
TimeUnit.MILLISECONDS,
this.heartbeatThreadPoolQueue,
new ThreadFactoryImpl("HeartbeatThread_", true));
this.endTransactionExecutor = new BrokerFixedThreadPoolExecutor(
this.brokerConfig.getEndTransactionThreadPoolNums(),
this.brokerConfig.getEndTransactionThreadPoolNums(),
1000 * 60,
TimeUnit.MILLISECONDS,
this.endTransactionThreadPoolQueue,
new ThreadFactoryImpl("EndTransactionThread_"));
this.consumerManageExecutor =
Executors.newFixedThreadPool(this.brokerConfig.getConsumerManageThreadPoolNums(), new ThreadFactoryImpl(
"ConsumerManageThread_"));
this.registerProceSSOr();
final long initialDelay = UtilAll.computeNextMorningTimeMillis() - System.currentTimeMillis();
final long period = 1000 * 60 * 60 * 24;
// 定时记录broker状态 默认 86400s 一次
this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
try {
BrokerController.this.getBrokerStats().record();
} catch (Throwable e) {
log.error("schedule record error.", e);
}
}
}, initialDelay, period, TimeUnit.MILLISECONDS);
// 定时持久化 offset, 5s 持久化一次
this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
try {
BrokerController.this.consumerOffsetManager.persist();
} catch (Throwable e) {
log.error("schedule persist consumerOffset error.", e);
}
}
}, 1000 * 10, this.brokerConfig.getFlushConsumerOffsetInterval(), TimeUnit.MILLISECONDS);
// 定时持久化filter, 10s同步一次
this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
try {
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 {
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 {
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 {
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) {
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 {
BrokerController.this.brokerOuterAPI.fetchNameServerAddr();
} catch (Throwable e) {
log.error("ScheduledTask fetchNameServerAddr exception", e);
}
}
}, 1000 * 10, 1000 * 60 * 2, TimeUnit.MILLISECONDS);
}
if (!messageStoreConfig.isEnableDLegerCommitLog()) {
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 {
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");
}
}
initialTransaction();
initialAcl();
initialRpcHooks();
}
return result;
}
Broker是如何注册到NameServer的
比较关键的一个点就是==Broker是如何注册到NameServer的==,我们来看看这段代码吧 在创建出BrokerController后调用了start方法
我们进入这个方法会看到一个定时线程池
this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
try {
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);
registerBrokerAll
然后进入方法registerBrokerAll
BrokerController.this.registerBrokerAll(true, false, brokerConfig.isForceRegister());
public synchronized void registerBrokerAll(final boolean checkOrderConfig, boolean oneway, boolean forceRegister) {
// Topic 相关配置信息
TopicConfigSerializeWrapper topicConfigWrapper = this.getTopicConfigManager().buildTopicConfigSerializeWrapper();
// 处理 TopicConfig信息
if (!PermName.isWriteable(this.getBrokerConfig().getBrokerPermission())
|| !PermName.isReadable(this.getBrokerConfig().getBrokerPermission())) {
ConcurrentHashMap<String, TopicConfig> topicConfigTable = new ConcurrentHashMap<String, TopicConfig>();
for (TopicConfig topicConfig : topicConfigWrapper.getTopicConfigTable().values()) {
TopicConfig tmp =
new TopicConfig(topicConfig.getTopicName(), topicConfig.getReadQueueNums(), topicConfig.getWriteQueueNums(),
this.brokerConfig.getBrokerPermission());
topicConfigTable.put(topicConfig.getTopicName(), tmp);
}
topicConfigWrapper.setTopicConfigTable(topicConfigTable);
}
// 判断是否进行Broker注册
if (forceRegister || needRegister(this.brokerConfig.getBrokerClusterName(),
this.getBrokerAddr(),
this.brokerConfig.getBrokerName(),
this.brokerConfig.getBrokerId(),
this.brokerConfig.getRegisterBrokerTimeoutMills())) {
// 真正注册Broker关键入口
doRegisterBrokerAll(checkOrderConfig, oneway, topicConfigWrapper);
}
}
doRegisterBrokerAll
我们进入到doRegisterBrokerAll看看，这下面就是注册Broker到NameServer的核心代码，涉及到Netty网络请求相关的代码被封装在registerBrokerAll()方法中，这段代码看完了我们可以进去看看
private void doRegisterBrokerAll(boolean checkOrderConfig, boolean oneway,
TopicConfigSerializeWrapper topicConfigWrapper) {
// 将Broker 注册到所有NameServer上，NameServer可能是集群有多个，所以这里是List
List<RegisterBrokerResult> registerBrokerResultList = this.brokerOuterAPI.registerBrokerAll(
this.brokerConfig.getBrokerClusterName(),
this.getBrokerAddr(),
this.brokerConfig.getBrokerName(),
this.brokerConfig.getBrokerId(),
this.getHAServerAddr(),
topicConfigWrapper,
this.filterServerManager.buildNewFilterServerList(),
oneway,
this.brokerConfig.getRegisterBrokerTimeoutMills(),
this.brokerConfig.isCompressedRegister());
// 如果注册结果大于 0 则继续处理相关逻辑
if (registerBrokerResultList.size() > 0) {
RegisterBrokerResult registerBrokerResult = registerBrokerResultList.get(0);
if (registerBrokerResult != null) {
if (this.updateMasterHAServerAddrPeriodically && registerBrokerResult.getHaServerAddr() != null) {
this.messageStore.updateHaMasterAddress(registerBrokerResult.getHaServerAddr());
}
this.slaveSynchronize.setMasterAddr(registerBrokerResult.getMasterAddr());
if (checkOrderConfig) {
this.getTopicConfigManager().updateOrderTopicConfig(registerBrokerResult.getKvTable());
}
}
}
}
registerBrokerAll()
这里我们来看看registerBrokerAll()方法
public List<RegisterBrokerResult> registerBrokerAll(
final String clusterName,
final String brokerAddr,
final String brokerName,
final long brokerId,
final String haServerAddr,
final TopicConfigSerializeWrapper topicConfigWrapper,
final List<String> filterServerList,
final boolean oneway,
final int timeoutMills,
final boolean compressed) {
// 用于存放每个远程注册的返回结果
final List<RegisterBrokerResult> registerBrokerResultList = new CopyOnWriteArrayList<>();
// NameServer的注册地址
List<String> nameServerAddressList = this.remotingClient.getNameServerAddressList();
if (nameServerAddressList != null && nameServerAddressList.size() > 0) {
// 构建网络请求头
final RegisterBrokerRequestHeader requestHeader = new RegisterBrokerRequestHeader();
requestHeader.setBrokerAddr(brokerAddr);
requestHeader.setBrokerId(brokerId);
requestHeader.setBrokerName(brokerName);
requestHeader.setClusterName(clusterName);
requestHeader.setHaServerAddr(haServerAddr);
requestHeader.setCompressed(compressed);
// 构建网络请求 body
RegisterBrokerBody requestBody = new RegisterBrokerBody();
requestBody.setTopicConfigSerializeWrapper(topicConfigWrapper);
requestBody.setFilterServerList(filterServerList);
final byte[] body = requestBody.encode(compressed);
final int bodyCrc32 = UtilAll.crc32(body);
requestHeader.setBodyCrc32(bodyCrc32);
// 多线程注册提高效率
final CountDownLatch countDownLatch = new CountDownLatch(nameServerAddressList.size());
for (final String namesrvAddr : nameServerAddressList) {
//自定义线程池
brokerOuterExecutor.execute(() -> {
try {
RegisterBrokerResult result = registerBroker(namesrvAddr,oneway, timeoutMills,requestHeader,body);
if (result != null) {
registerBrokerResultList.add(result);
}
log.info("register broker[{}]to name server {} OK", brokerId, namesrvAddr);
} catch (Exception e) {
log.warn("registerBroker Exception, {}", namesrvAddr, e);
} finally {
countDownLatch.countDown();
}
});
}
try {
countDownLatch.await(timeoutMills, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
}
}
return registerBrokerResultList;
}
总结
我们这里就把Broker的启动流程分析完了，我们这里并没有一行代码一行代码去看，因为有些代码不知道实际的业务场景，我们也不知道是干嘛的，总的来说看了整个源码的一个核心流程，相关细节并没有很深入，主要是对Broker的启动有了一个大致的了解，后续如果需要修改或者遇到了相关问题，可以很好的找到入库，问题排查也会更轻松
原文始发于微信公众号（小奏技术）：RocketMQ源码分析【三】Broker启动流程源码分析
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