rushsky518 opened a new issue #1776: When enableMsgTrace is true, two 
MQClientInstance objects are created
URL: https://github.com/apache/rocketmq/issues/1776
 
 
   org.apache.rocketmq.client.trace.AsyncTraceDispatcher#start
   ````java
       public void start(String nameSrvAddr, AccessChannel accessChannel) 
throws MQClientException {
           if (isStarted.compareAndSet(false, true)) {
               traceProducer.setNamesrvAddr(nameSrvAddr);
               // instanceName is not pid, so a new MQClinetInstance will be 
crated
               traceProducer.setInstanceName(TRACE_INSTANCE_NAME + "_" + 
nameSrvAddr);
               traceProducer.start();
           }
           this.accessChannel = accessChannel;
           this.worker = new Thread(new AsyncRunnable(), 
"MQ-AsyncTraceDispatcher-Thread-" + dispatcherId);
           this.worker.setDaemon(true);
           this.worker.start();
           this.registerShutDownHook();
       }
   ````
   InstanceName is not pid, and a new MQClinetInstance will be crated. 

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