Prasanth Jayachandran created HIVE-19875:

             Summary: increase LLAP IO queue size for perf
                 Key: HIVE-19875
             Project: Hive
          Issue Type: Bug
    Affects Versions: 3.1.0, 4.0.0
            Reporter: Prasanth Jayachandran
            Assignee: Prasanth Jayachandran

According to [~gopalv] queue limit has perf impact, esp. during hashtable load 
for mapjoin where in the past IO used to queue up more data for processing to 
1) Overall the default limit could be adjusted higher.
2) Depending on Decimal64 availability, the weight for decimal columns could be 

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