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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