Mustafa Iman created HIVE-23745:

             Summary: Avoid copying userpayload in task communicator
                 Key: HIVE-23745
             Project: Hive
          Issue Type: Sub-task
            Reporter: Mustafa Iman
            Assignee: Mustafa Iman

 I see this copy take a few milliseconds sometimes. Delay here adds up for all 
tasks of a single vertex in LlapTaskCommunicator as it processes tasks one by 
one. User payload never changes in this codepath. Copy is made because of 
limitations of Protobuf library. Protobuf adds a UnsafeByteOperations class 
that avoid copying of ByteBuffers in 3.1 version. This can be resolved when 
Protobuf is upgraded.

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