fuyou001 commented on a change in pull request #205: [ROCKETMQ-319] improve 
broker register performance and reduce memory usage  
URL: https://github.com/apache/rocketmq/pull/205#discussion_r171816294
 
 

 ##########
 File path: 
broker/src/main/java/org/apache/rocketmq/broker/out/BrokerOuterAPI.java
 ##########
 @@ -231,6 +259,72 @@ public void unregisterBroker(
         throw new MQBrokerException(response.getCode(), response.getRemark());
     }
 
+    public List<Boolean> needRegister(
+        final String clusterName,
+        final String brokerAddr,
+        final String brokerName,
+        final long brokerId,
+        final TopicConfigSerializeWrapper topicConfigWrapper,
+        final int timeoutMills) {
+        final List<Boolean> changedList = new CopyOnWriteArrayList<>();
+        List<String> nameServerAddressList = 
this.remotingClient.getNameServerAddressList();
+        if (nameServerAddressList != null && nameServerAddressList.size() > 0) 
{
+            final CountDownLatch countDownLatch = new 
CountDownLatch(nameServerAddressList.size());
+            for (final String namesrvAddr : nameServerAddressList) {
+                brokerOuterExecutor.execute(new Runnable() {
+                    @Override
+                    public void run() {
+                        try {
+                            QueryDataVersionRequestHeader requestHeader = new 
QueryDataVersionRequestHeader();
+                            requestHeader.setBrokerAddr(brokerAddr);
+                            requestHeader.setBrokerId(brokerId);
+                            requestHeader.setBrokerName(brokerName);
+                            requestHeader.setClusterName(clusterName);
+                            RemotingCommand request = 
RemotingCommand.createRequestCommand(RequestCode.QUERY_DATA_VERSION, 
requestHeader);
+                            
request.setBody(topicConfigWrapper.getDataVersion().encode());
+                            RemotingCommand response = 
remotingClient.invokeSync(namesrvAddr, request, timeoutMills);
+                            DataVersion nameServerDataVersion = null;
 
 Review comment:
   if so , 2 minutes later,name server will close broker's socket 

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