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Posted to dev@pig.apache.org by "Pallavi Rao (JIRA)" <ji...@apache.org> on 2015/10/21 10:06:27 UTC

[jira] [Created] (PIG-4709) Improve performance of GROUPBY operator on Spark

Pallavi Rao created PIG-4709:
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             Summary: Improve performance of GROUPBY operator on Spark
                 Key: PIG-4709
                 URL: https://issues.apache.org/jira/browse/PIG-4709
             Project: Pig
          Issue Type: Sub-task
          Components: spark
            Reporter: Pallavi Rao
            Assignee: Pallavi Rao


Currently, the GROUPBY operator of PIG is mapped by Spark's CoGroup. When the grouped data is consumed by subsequent operations to perform algebraic operations, this is sub-optimal as there is lot of shuffle traffic. 

The Spark Plan must be optimized to use reduceBy, where possible, so that a combiner is used.



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