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https://issues.apache.org/jira/browse/PIG-1790?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Corinne Chandel resolved PIG-1790.
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Resolution: Fixed
Performance and Efficiency doc updated
New Combiner section added.
Patch will be submitted under Pig-1772.
> Need to document when combiner is used
> --------------------------------------
>
> Key: PIG-1790
> URL: https://issues.apache.org/jira/browse/PIG-1790
> Project: Pig
> Issue Type: Improvement
> Components: documentation
> Reporter: Olga Natkovich
> Assignee: Corinne Chandel
> Fix For: 0.9.0
>
>
> I serached through the documentation but could not find a section that
> describes the cases under which combiner is used. Since combiner has such a
> significant impact on query performance, I think it is important to add this
> information. Also, with 0.9 we are expending combiner usage so having
> documentation would be useful for that as well.
> Here are the JIRAs for combiner use slated for 0.9:
> https://issues.apache.org/jira/browse/PIG-750
> https://issues.apache.org/jira/browse/PIG-490
> https://issues.apache.org/jira/browse/PIG-946
> https://issues.apache.org/jira/browse/PIG-1735
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