liupc commented on issue #23989: [SPARK-27073][CORE]Handling of IdleStateEvent 
causes the normal connection to close
URL: https://github.com/apache/spark/pull/23989#issuecomment-471171220
 
 
   @cxzl25 What if the instructions rearrangement happen? the execution order 
of updating `timeOfLastRequestNs` and adding to `outstandingRpcs` is not 
guaranteed. And without synchronization or volatile the updating result of 
`timeOfLastRequestNs` and `outstandingRpcs` may not be seen immediately in 
`TransportChannelHandler`.
   
   Even without above problems, I think this fix is a little bit tricky.

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