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https://issues.apache.org/jira/browse/PIG-1249?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12983470#action_12983470
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Daniel Dai commented on PIG-1249:
---------------------------------

Agreed, "mapred.reduce.task" should have higher priority than 
estimateNumberOfreducers(). If not, then it's a bug. 

> Safe-guards against misconfigured Pig scripts without PARALLEL keyword
> ----------------------------------------------------------------------
>
>                 Key: PIG-1249
>                 URL: https://issues.apache.org/jira/browse/PIG-1249
>             Project: Pig
>          Issue Type: Improvement
>    Affects Versions: 0.8.0
>            Reporter: Arun C Murthy
>            Assignee: Jeff Zhang
>            Priority: Critical
>             Fix For: 0.8.0
>
>         Attachments: PIG-1249-4.patch, PIG-1249.patch, PIG-1249_5.patch, 
> PIG_1249_2.patch, PIG_1249_3.patch
>
>
> It would be *very* useful for Pig to have safe-guards against naive scripts 
> which process a *lot* of data without the use of PARALLEL keyword.
> We've seen a fair number of instances where naive users process huge 
> data-sets (>10TB) with badly mis-configured #reduces e.g. 1 reduce. 

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