Csaba Ringhofer created IMPALA-13630:
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             Summary: Don't hold KrpcDataStreamMgr::lock_ during CancelStream()
                 Key: IMPALA-13630
                 URL: https://issues.apache.org/jira/browse/IMPALA-13630
             Project: IMPALA
          Issue Type: Improvement
          Components: Backend
            Reporter: Csaba Ringhofer


KrpcDataStreamMgr::Cancel()/KrpcDataStreamMgr::DeregisterRecvr() holds this 
global lock during the whole operation. KrpcDataStreamRecvr::CancelStream() may 
take some time to complete if it needs to wait for lock or there are a large 
number of deferred rpcs.



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