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https://issues.apache.org/jira/browse/HADOOP-9747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16141807#comment-16141807
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Eric Payne commented on HADOOP-9747:
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[~daryn], I started to commit this, but I ran into a couple of issues:
# If this fix needs to go into branch-2.8, we may need a separate 2.8 patch. I
tried applying the branch-2 patch to branch-2.8, and there were several
conflicts in {{UserGroupInformation.java}}
# {{HADOOP-9747.2.branch-2.patch}} does not apply cleanly to branch-2. It's
just a minor import conflict that I could fix myself, but as long as you need
to address the branch-2.8 conflicts...
> 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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