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https://issues.apache.org/jira/browse/PIG-2652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13253890#comment-13253890
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Dmitriy V. Ryaboy commented on PIG-2652:
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+1.
This code is quite the mess. At some point we need to refactor it.

Not running sampling for skewed / merge / order jobs when parallelism is set to 
1 should be a separate ticket (I think I filed it already? Maybe just meant to).

Please commit to 10 and 11.
                
> 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: Bill Graham
>         Attachments: PIG-2652_1.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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