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From "Rohini Palaniswamy (JIRA)" <j...@apache.org>
Subject [jira] [Created] (PIG-4802) Autoparallelism should estimate less when there is combiner
Date Wed, 10 Feb 2016 14:53:18 GMT
Rohini Palaniswamy created PIG-4802:
---------------------------------------

             Summary: Autoparallelism should estimate less when there is combiner
                 Key: PIG-4802
                 URL: https://issues.apache.org/jira/browse/PIG-4802
             Project: Pig
          Issue Type: Improvement
            Reporter: Rohini Palaniswamy
            Assignee: Rohini Palaniswamy
             Fix For: 0.16.0


  When there is a combiner, it reduces records by a lot. Auto-parallelism should take that
into account. 

  Also currently we multiply by a factor of 10 if there is any FLATTEN. Users usually have
FLATTEN(group) when the group by key is a compound key and it ends up estimating high. Only
FLATTEN of bag should be considered.



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