I have test setInstanceName . If not set, the instanceName is  pid , 
If not set the instanceName , A JVM have start two consumer client with 
diffirent groupName, but the inner
client is the same , the   connection is the same .
**MQClientManager  is singleton , if not setInstanceName , so get 
getAndCreateMQClientInstance is use the same one** 

[ Full content available at: https://github.com/apache/rocketmq/issues/473 ]
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