Jason Lowe created MAPREDUCE-7033:
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Summary: Map outputs implicitly rely on permissive umask for
shuffle
Key: MAPREDUCE-7033
URL: https://issues.apache.org/jira/browse/MAPREDUCE-7033
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: mrv2
Reporter: Jason Lowe
Map tasks do not explicitly set the permissions of their output files for
shuffle. In a secure cluster the shuffle service is running as a different
user than the map task, so the output files require group readability in order
to serve up the data during the shuffle phase. If the user's UNIX umask is too
restrictive (e.g.: 077) then the map task's file.out and file.out.index
permissions can be too restrictive to allow the shuffle handler to access them.
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