if one backend_service the agent may be never reconnect

[xiongrl]

Please answer these questions before submitting your issue.

• Why do you submit this issue?
• Question or discussion
• Bug
• Requirement
• Feature or performance improvement

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Question

• What do you want to know?

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Bug

• Which version of SkyWalking, OS and JRE?

org.apache.skywalking.apm.agent.core.remote.GRPCChannelManager
  @Override
   public void run() {
       logger.debug("Selected collector grpc service running, reconnect:{}.", reconnect);
       if (reconnect) {
           if (grpcServers.size() > 0) {
               String server = "";
               try {
                   int index = Math.abs(random.nextInt()) % grpcServers.size();
                   if (index != selectedIdx) {
                       selectedIdx = index;

only one grpcServer so grpcServers.size() = 1
First reconnection set selectedIdx = 1 if connection fail ;
The second reconnection if 1 !=1 (code if (index != selectedIdx)) never to reconnection

[kezhenxu94]

The bug should be fixed in 6.3.0, #3181 and #3240 , please try the master branch @xiongrl

[kezhenxu94]

@xiongrl #3181 is included in version 6.3.0, while #3240 is not and will be included in next version

[xiongrl]

thx

[kanouken]

version 7.0.0 + can reproduce this issue again 。。。