Some consumer trace send fail

[yuz10]

1. Please describe the issue you observed:

• What did you do (The steps to reproduce)?

  1. produce 3 messages
  2. consume the messages with trace enabled

     int main(int argc, char* argv[]) {
     int i = 0;
     printf("PushConsumer Initializing....\n");
     CPushConsumer* consumer = CreatePushConsumer("Group_Consumer_Test");
     SetPushConsumerMessageTrace(consumer, OPEN);
     SetPushConsumerNameServerAddress(consumer, "127.0.0.1:9876");
     Subscribe(consumer, "TopicTest", "*");
     RegisterMessageCallback(consumer, doConsumeMessage);
     StartPushConsumer(consumer);
     printf("Push Consumer Start...\n");
     for (i = 0; i < 10; i++) {
     printf("Now Running : %d S\n", i * 10);
     thread_sleep(10000);
     }
     ShutdownPushConsumer(consumer);
     DestroyPushConsumer(consumer);
     printf("PushConsumer Shutdown!\n");
     return 0;
     }

• What did you expect to see? all the trace produce success

• What did you see instead? some trace produce fail some error is print in DefaultMQPushConsumerImpl::submitSendTraceRequest but if I dont send some messages before starting consume, no error is print

2. Please tell us about your environment:

   • What is your OS?

   • What is your client version?

   • What is your RocketMQ version?

3. Other information (e.g. detailed explanation, logs, related issues, suggestions on how to fix, etc):