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https://issues.apache.org/jira/browse/HADOOP-14659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16090006#comment-16090006
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Rushabh S Shah commented on HADOOP-14659:
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+1 non-binding.
> UGI getShortUserName does not need to search the Subject
> --------------------------------------------------------
>
> Key: HADOOP-14659
> URL: https://issues.apache.org/jira/browse/HADOOP-14659
> Project: Hadoop Common
> Issue Type: Improvement
> Components: common
> Affects Versions: 2.0.0-alpha
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Attachments: HADOOP-14659.patch
>
>
> {{UGI#getShortUserName}} searches the subject for the {{User}} instance.
> It's not cheap to iterate a synchronized set, copy matches into a new set,
> then iterating that set. The UGI ctor already set the {{User}} into a final
> field...
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