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https://issues.apache.org/jira/browse/HADOOP-9747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16374631#comment-16374631
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Kihwal Lee commented on HADOOP-9747:
------------------------------------

Thanks for the review [~bharatviswa]. With my official +1, I will commit it 
shortly.

> Reduce unnecessary UGI synchronization
> --------------------------------------
>
>                 Key: HADOOP-9747
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9747
>             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-9747-trunk-03.patch, HADOOP-9747-trunk-04.patch, 
> HADOOP-9747-trunk.01.patch, HADOOP-9747-trunk.02.patch, 
> HADOOP-9747.2.branch-2.patch, HADOOP-9747.2.trunk.patch, 
> HADOOP-9747.branch-2.patch, HADOOP-9747.trunk.patch
>
>
> Jstacks of heavily loaded NNs show up to dozens of threads blocking in the 
> UGI.



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