cxzl25 opened a new pull request #23989: [SPARK-27073][CORE]Handling of 
IdleStateEvent causes the normal connection to close
URL: https://github.com/apache/spark/pull/23989
 
 
   ## What changes were proposed in this pull request?
   
   When TransportChannelHandler processes IdleStateEvent, it first calculates 
whether the last request time has timed out.
   At this time, TransportClient.sendRpc initiates a request.
   TransportChannelHandler gets responseHandler.numOutstandingRequests() > 0, 
causing the normal connection to be closed.
   
   ## How was this patch tested?
   
   

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