Change pipes to use env vars for stdout/stderr files
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Key: MAPREDUCE-2681
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2681
Project: Hadoop Map/Reduce
Issue Type: Improvement
Reporter: Arun C Murthy
Assignee: Vinod Kumar Vavilapalli
Fix For: 0.23.0
Change pipes to use env vars for stdout/stderr files, currently they are
hard-coded. This is important for MAPREDUCE-279.
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