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https://issues.apache.org/jira/browse/PIG-2652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13415459#comment-13415459
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Jie Li commented on PIG-2652:
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Then the skewed keys will only go to some of the reducers, and ideally we want
to distribute them across all reducers right? I can fix it in PIG-2779.
> Skew join and order by don't trigger reducer estimation
> -------------------------------------------------------
>
> Key: PIG-2652
> URL: https://issues.apache.org/jira/browse/PIG-2652
> Project: Pig
> Issue Type: Bug
> Reporter: Bill Graham
> Assignee: Dmitriy V. Ryaboy
> Fix For: 0.9.3, 0.11, 0.10.1
>
> Attachments: PIG-2652_1.patch, PIG-2652_2.patch, PIG-2652_3.patch,
> PIG-2652_3_10.patch, PIG-2652_4.patch, PIG-2652_5.patch, PIG-2652_6.patch,
> PIG-2652_7.patch
>
>
> If neither PARALLEL, default parallel or {{mapred.reduce.tasks}} are set, the
> number of reducers is not estimated based on input size for skew joins or
> order by. Instead, these jobs get only 1 reducer.
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