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https://issues.apache.org/jira/browse/PIG-4709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15102914#comment-15102914
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Mohit Sabharwal commented on PIG-4709:
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Thanks, [~pallavi.rao]. Sorry about the delay! Left some minor comments on RB.
Didn't get a chance to go through in detail.
I think we can have this committed based on Kelly's feedback (as soon as the
latest round of feedback is addressed)
Will take a detailed look once I have time. We can incorporate feedback, if
any, in a follow-up patch.
> 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-v1.patch, PIG-4709-v2.patch, PIG-4709.patch,
> TEST-org.apache.pig.test.TestCombiner.xml
>
>
> 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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