Padma Penumarthy created DRILL-6180:

             Summary: Use System Option "output_batch_size" for External Sort
                 Key: DRILL-6180
             Project: Apache Drill
          Issue Type: Improvement
          Components: Execution - Flow
    Affects Versions: 1.12.0
            Reporter: Padma Penumarthy
            Assignee: Padma Penumarthy
             Fix For: 1.13.0

External Sort has boot time configuration for output batch size 
"drill.exec.sort.external.spill.merge_batch_size" which is defaulted to 16M.

To make batch sizing configuration uniform across all operators, change this to 
use new system option that is added 
"drill.exec.memory.operator.output_batch_size". This option has default value 
of 32M.

So, what are the implications if default is changed to 32M for external sort ?

Instead, should we change the output batch size default to 16M for all 
operators ?



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