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https://issues.apache.org/jira/browse/MAPREDUCE-1464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12830457#action_12830457
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Kan Zhang commented on MAPREDUCE-1464:
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I looked at the patch again and found that there is no null checking at the
caller (per your HADOOP-6510.21.patch). I suggestion you return an empty ugi
instead of null for getUser() method (do the same in HDFS-935) to reduce the
chance of NullPointerException at runtime.
> In JobTokenIdentifier change method getUsername to getUser which returns UGI
> ----------------------------------------------------------------------------
>
> Key: MAPREDUCE-1464
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1464
> Project: Hadoop Map/Reduce
> Issue Type: New Feature
> Reporter: Jitendra Nath Pandey
> Attachments: MR-1464.1.patch
>
>
> The TokenIdentifier interface has changed in HADOOP-6510. This jira tracks
> corresponding change in MR. The only change is that in JobTokenIdentifier
> getUsername method will be changed to getUser that will return ugi.
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