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https://issues.apache.org/jira/browse/HADOOP-6912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13003754#comment-13003754
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Jitendra Nath Pandey commented on HADOOP-6912:
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> one should check again whether the HDFS or MR builds break since the
> signature of a public method is changing.
This method is not being used in HDFS or MR in trunk.
> Guard against NPE when calling UGI.isLoginKeytabBased()
> -------------------------------------------------------
>
> Key: HADOOP-6912
> URL: https://issues.apache.org/jira/browse/HADOOP-6912
> Project: Hadoop Common
> Issue Type: Bug
> Components: security
> Reporter: Kan Zhang
> Assignee: Kan Zhang
> Fix For: 0.23.0
>
> Attachments: c6912-01.patch
>
>
> NPE can happen when isLoginKeytabBased() is called before a login is
> performed. See MAPREDUCE-1992 for an example.
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