mustafaiman opened a new pull request #1053:
URL: https://github.com/apache/hive/pull/1053


   We should avoid calling LlapTaskScheduler to get initial isguaranteed flag 
for all the tasks. It causes arbitrary delays in sending tasks out. Since 
communicator is a single thread, any blocking there delays all the tasks.
   
   There is https://jira.apache.org/jira/browse/HIVE-23589 for a proper 
solution to this. However, that requires a Tez release which seems far right 
now. We can replace the current hack with another hack that does not require 
locking.
   
   Change-Id: If08961fcb0e5ea3b2772c619be1a26068afe1327


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