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https://issues.apache.org/jira/browse/HADOOP-9317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15282179#comment-15282179
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Sangjin Lee commented on HADOOP-9317:
-------------------------------------

There has been no movement on this for a while. We'll need to move it out of 
scope for 2.8.0 soon. Let me know if you disagree.

> User cannot specify a kerberos keytab for commands
> --------------------------------------------------
>
>                 Key: HADOOP-9317
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9317
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 0.23.0, 2.0.0-alpha, 3.0.0-alpha1
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>         Attachments: HADOOP-9317.branch-23.patch, 
> HADOOP-9317.branch-23.patch, HADOOP-9317.patch, HADOOP-9317.patch, 
> HADOOP-9317.patch, HADOOP-9317.patch
>
>
> {{UserGroupInformation}} only allows kerberos users to be logged in via the 
> ticket cache when running hadoop commands.  {{UGI}} allows a keytab to be 
> used, but it's only exposed programatically.  This forces keytab-based users 
> running hadoop commands to periodically issue a kinit from the keytab.  A 
> race condition exists during the kinit when the ticket cache is deleted and 
> re-created.  Hadoop commands will fail when the ticket cache does not 
> momentarily exist.



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