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https://issues.apache.org/jira/browse/PIG-3497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13785876#comment-13785876
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Aniket Mokashi commented on PIG-3497:
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+1. Committed to trunk.
[~daijy], should we also commit this to 0.12?
> JobControlCompiler should only do reducer estimation when the job has a
> reduce phase
> ------------------------------------------------------------------------------------
>
> Key: PIG-3497
> URL: https://issues.apache.org/jira/browse/PIG-3497
> Project: Pig
> Issue Type: Bug
> Reporter: Akihiro Matsukawa
> Assignee: Akihiro Matsukawa
> Priority: Minor
> Attachments: reducer_estimation.patch
>
>
> Currently, JobControlCompiler makes an estimation for the number of reducers
> required (by default based on input size into mappers) regardless of whether
> there is a reduce phase in the job. This is unnecessary, especially when
> running more complex custom reducer estimators.
> Change to only estimate reducers when necessary.
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