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https://issues.apache.org/jira/browse/PIG-4709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15032504#comment-15032504
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Xuefu Zhang commented on PIG-4709:
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Thanks, [~pallavi.rao]. Great work! I posted a few comments, mostly cosmetic,
on RB. This is a complex optimization, and I hope others can also take a look.
> 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
> Labels: spork
> Fix For: spark-branch
>
> Attachments: PIG-4709.patch
>
>
> 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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