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3路由注册
NameServer处理心跳包
DefaultRequestProcessor网络处理器解析请求类型，RequestCode.REGISTER_BROKER类型请求转发给RouteInfoManager的registerBroker方法：
public RegisterBrokerResult registerBroker(
final String clusterName,
final String brokerAddr,
final String brokerName,
final long brokerId,
final String haServerAddr,
final TopicConfigSerializeWrapper topicConfigWrapper,
final List<String> filterServerList,
final Channel channel) {
RegisterBrokerResult result = new RegisterBrokerResult();
try {
try {
//加写锁
this.lock.writeLock().lockInterruptibly();
Set<String> brokerNames = this.clusterAddrTable.get(clusterName);
if (null == brokerNames) {
brokerNames = new HashSet<String>();
this.clusterAddrTable.put(clusterName, brokerNames);
}
brokerNames.add(brokerName);
boolean registerFirst = false;
BrokerData brokerData = this.brokerAddrTable.get(brokerName);
if (null == brokerData) {
registerFirst = true;
brokerData = new BrokerData(clusterName, brokerName, new HashMap<Long, String>());
this.brokerAddrTable.put(brokerName, brokerData);
}
Map<Long, String> brokerAddrsMap = brokerData.getBrokerAddrs();
//Switch slave to master: first remove <1, IP:PORT> in namesrv, then add <0, IP:PORT>
//The same IP:PORT must only have one record in brokerAddrTable
Iterator<Entry<Long, String>> it = brokerAddrsMap.entrySet().iterator();
while (it.hasNext()) {
Entry<Long, String> item = it.next();
if (null != brokerAddr && brokerAddr.equals(item.getValue()) && brokerId != item.getKey()) {
it.remove();
}
}
String oldAddr = brokerData.getBrokerAddrs().put(brokerId, brokerAddr);
registerFirst = registerFirst || (null == oldAddr);
//如果Broker为Master，并且Broker Topic配置信息发生变化或者是初次注册，则需要创建或更新Topic路由元数据，填充topicQueueTable
// ，其实就是为默认主题自动注册路由信息，其中包含MixAll.DEFAULT_TOPIC的路由信息。
if (null != topicConfigWrapper && MixAll.MASTER_ID == brokerId) {
if (this.isBrokerTopicConfigChanged(brokerAddr, topicConfigWrapper.getDataVersion()) || registerFirst) {
ConcurrentMap<String, TopicConfig> tcTable = topicConfigWrapper.getTopicConfigTable();
if (tcTable != null) {
for (Map.Entry<String, TopicConfig> entry : tcTable.entrySet()) {
this.createAndUpdateQueueData(brokerName, entry.getValue());
}
}
}
}
BrokerLiveInfo prevBrokerLiveInfo = this.brokerLiveTable.put(brokerAddr,
new BrokerLiveInfo(
System.currentTimeMillis(),
topicConfigWrapper.getDataVersion(),
channel,
haServerAddr));
if (null == prevBrokerLiveInfo) {
log.info("new broker registered, {} HAServer: {}", brokerAddr, haServerAddr);
}
if (filterServerList != null) {
if (filterServerList.isEmpty()) {
this.filterServerTable.remove(brokerAddr);
} else {
this.filterServerTable.put(brokerAddr, filterServerList);
}
}
if (MixAll.MASTER_ID != brokerId) {
String masterAddr = brokerData.getBrokerAddrs().get(MixAll.MASTER_ID);
if (masterAddr != null) {
BrokerLiveInfo brokerLiveInfo = this.brokerLiveTable.get(masterAddr);
if (brokerLiveInfo != null) {
result.setHaServerAddr(brokerLiveInfo.getHaServerAddr());
result.setMasterAddr(masterAddr);
}
}
}
} finally {
this.lock.writeLock().unlock();
}
} catch (Exception e) {
log.error("registerBroker Exception", e);
}
return result;
}
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路由注册需要加写锁，防止并发修改RouteInfoManager中的路由表。首先判断Broker所属集群是否存在，如果不存在，则创建，然后将broker名加入到集群Broker集合中。
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维护BrokerData信息，首先从brokerAddrTable根据brokerName尝试获取Broker信息，如果不存在，直接替换原先的
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如果Broker为Master，并且Broker Topic配置信息发生变化或者是初次注册，则需要创建或更新Topic路由元数据，填充topicQueueTable
private void createAndUpdateQueueData(final String brokerName, final TopicConfig topicConfig) { QueueData queueData = new QueueData(); queueData.setBrokerName(brokerName); queueData.setWriteQueueNums(topicConfig.getWriteQueueNums()); queueData.setReadQueueNums(topicConfig.getReadQueueNums()); queueData.setPerm(topicConfig.getPerm()); queueData.setTopicSynFlag(topicConfig.getTopicSysFlag()); List<QueueData> queueDataList = this.topicQueueTable.get(topicConfig.getTopicName()); if (null == queueDataList) { queueDataList = new LinkedList<QueueData>(); queueDataList.add(queueData); this.topicQueueTable.put(topicConfig.getTopicName(), queueDataList); log.info("new topic registered, {} {}", topicConfig.getTopicName(), queueData); } else { boolean addNewOne = true; Iterator<QueueData> it = queueDataList.iterator(); while (it.hasNext()) { QueueData qd = it.next(); if (qd.getBrokerName().equals(brokerName)) { if (qd.equals(queueData)) { addNewOne = false; } else { log.info("topic changed, {} OLD: {} NEW: {}", topicConfig.getTopicName(), qd, queueData); it.remove(); } } } if (addNewOne) { queueDataList.add(queueData); } } } -
更新BrokerLiveInfo，存活Broker信息表，BrokerLiveInfo是执行路由删除的重要依据。
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注册Broker的过滤器Server地址列表，一个Broker上会关联多个FilterServer消息过滤服务器，如果此Broker为从节点，则需要查找该Broker的Master的节点信息，并更新对应的masterAddr属性。
NameServer与Broker保持长连接，Broker状态存储在brokerLiveTable中，NameServer每收到一个心跳包，将更新brokerLiveTable中关于Broker的状态信息以及路由表。更新路由表使用读写锁，允许多个消费生产者并发读，保证消息发送时的高并发。但同一时刻NameServer只处理一个Broker心跳包，多个心跳包请求串行执行。
