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https://issues.apache.org/jira/browse/TEZ-3894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16358845#comment-16358845
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Kuhu Shukla commented on TEZ-3894:
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The patch looks good to me. +1. Committing this shortly.

> Tez intermediate outputs implicitly rely on permissive umask for shuffle
> ------------------------------------------------------------------------
>
>                 Key: TEZ-3894
>                 URL: https://issues.apache.org/jira/browse/TEZ-3894
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Major
>         Attachments: TEZ-3894.001.patch
>
>
> Tez does not explicitly set the permissions of intermediate output files for 
> shuffle. In a secure cluster the shuffle service is running as a different 
> user than the task, so the output files require group readability in order to 
> serve up the data during the shuffle phase. If the umask is too restrictive 
> (e.g.: 077) then the 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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