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https://issues.apache.org/jira/browse/PIG-2553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13495554#comment-13495554
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Rohini Palaniswamy commented on PIG-2553:
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This might break some existing custom StoreFuncs. Currently you can write a
custom storer which allows to write into same directory, but with different
file names. We have users who have written that kind of Storers.
> Pig shouldn't allow attempts to write multiple relations into same directory
> ----------------------------------------------------------------------------
>
> Key: PIG-2553
> URL: https://issues.apache.org/jira/browse/PIG-2553
> Project: Pig
> Issue Type: Improvement
> Reporter: Dmitriy V. Ryaboy
> Assignee: Prashant Kommireddi
> Attachments: PIG-2553.patch
>
>
> We've seen multiple occasions where users accidentally try to store 2 or more
> different relations to the same destination directory. Currently, this passes
> the Pig planner and fails on MR side due to concurrent attempts to create the
> same part file on the reducer. This is extremely confusing to the user, and
> hard to debug.
> We should instead fail their scripts before they are even submitted, since we
> can identify the erroneous condition from the beginning.
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