adamswanglin commented on pull request #1196:
URL: https://github.com/apache/rocketmq/pull/1196#issuecomment-646547368


   > @aftersss it means that the Server is very busy to resolve the stacked 
requests, so retrying at this time will increase the pressure on the server, so 
fast failure is a good choice.
   
   
![image](https://user-images.githubusercontent.com/26845930/85120285-9c273180-b255-11ea-8f37-1b2ac60f14a2.png)
   
   In our production environment, queues of a topic discarded on at least two 
brokers. Sudden IO may cause broker SYSTEM_BUSY(actually it happened). Isn't 
that normal for client try another broker to send the message ?(The code above 
shows that the default strategy of retried queue is from another broker) 


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