[jira] [Created] (MAPREDUCE-7033) Map outputs implicitly rely on permissive umask for shuffle

["Jason Lowe (JIRA)" <ji...@apache.org>]

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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