Pig shouldn't allow attempts to write multiple relations into same directory
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Key: PIG-2553
URL: https://issues.apache.org/jira/browse/PIG-2553
Project: Pig
Issue Type: Improvement
Reporter: Dmitriy V. Ryaboy
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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