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https://issues.apache.org/jira/browse/PIG-2553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13495729#comment-13495729
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Rohini Palaniswamy commented on PIG-2553:
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PiggyBank also has a MultiStorage -
http://svn.apache.org/viewvc/pig/trunk/contrib/piggybank/java/src/main/java/org/apache/pig/piggybank/storage/MultiStorage.java?revision=1145447&view=markup.
One thing we could do is print a warning message instead of throwing a error.
I don't see a way to correctly determine and throw an error. And in cases like
MultiStorage the filename is not even static. The output dir name/file name is
dynamic and depends on the value of a field in the record.
> 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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