Mustafa Iman created HIVE-23746:

             Summary: Send task attempts async from AM to daemons
                 Key: HIVE-23746
             Project: Hive
          Issue Type: Sub-task
          Components: llap
            Reporter: Mustafa Iman
            Assignee: Mustafa Iman

LlapTaskCommunicator uses sync client to send task attempts. There are fixed 
number of communication threads (10 by default). This causes unneccessary 
delays when there are enough free execution slots in daemons but they do not 
receive all the tasks because of this bottleneck. LlapTaskCommunicator can use 
an async client to pass these tasks to daemons. 

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