Github user revans2 commented on the issue:

    https://github.com/apache/storm/pull/2241
  
    @roshannaik The output collector is wrapped separately by each bolt so it 
will have no effect.
    
    
https://github.com/apache/storm/blob/master/storm-client/src/jvm/org/apache/storm/topology/BasicBoltExecutor.java#L44
    
    I am not saying that we cannot make the change.  I just want us all to 
understand the consequences of these changes.  Removing the synchronization 
from the shuffle grouping  will make it so this is no longer a rolling upgrade. 
 To me the cost just does not offset the reward for doing so.


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