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https://issues.apache.org/jira/browse/HADOOP-9747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16116110#comment-16116110
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Junping Du commented on HADOOP-9747:
------------------------------------

[~daryn], I can understand your passion in fixing this long term existing issue 
so I am OK to get this in 2.8.2 if the patch get well tested in production 
environment before we cut RC (target before end of Aug.). Do you have specific 
test plan or this is already get tested in Yahoo! production cluster?

> 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-9747.2.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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