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From "Eric Payne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-7033) Map outputs implicitly rely on permissive umask for shuffle
Date Wed, 31 Jan 2018 21:32:00 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-7033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16347646#comment-16347646
] 

Eric Payne commented on MAPREDUCE-7033:
---------------------------------------

+1
[~jlowe] thanks for taking the time to fix this issue. I will commit shortly.

> 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
>            Assignee: Jason Lowe
>            Priority: Critical
>         Attachments: MAPREDUCE-7033.001.patch, MAPREDUCE-7033.002.patch
>
>
> 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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