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https://issues.apache.org/jira/browse/HADOOP-9747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15282176#comment-15282176
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Sangjin Lee commented on HADOOP-9747:
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There has been no movement on this for a while. We'll need to move it out of
scope for 2.8.0 soon. Let me know if you disagree.
> 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
>
> Jstacks of heavily loaded NNs show up to dozens of threads blocking in the
> UGI.
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