[jira] [Commented] (TEZ-3894) Tez intermediate outputs implicitly rely on permissive umask for shuffle

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

    [ https://issues.apache.org/jira/browse/TEZ-3894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16347600#comment-16347600 ] 

Jason Lowe commented on TEZ-3894:
---------------------------------

This is the Tez equivalent of MAPREDUCE-7033.  This will become more of an issue with Hadoop 3.x since HADOOP-11347 fixed a bug in the local filesystem to have it honor the configured fs.permission.umask-mode property where it was ignored in 2.x and implicitly relied on the UNIX umask.

> 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
>
> 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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