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https://issues.apache.org/jira/browse/HADOOP-9747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16116600#comment-16116600
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Jeff Storck commented on HADOOP-9747:
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[~djp] [~daryn] I've tested this patch against an HDP 2.6 cluster using the
code I've linked on HADOOP-14699, and the results are promising. I'll be doing
some more testing today to verify that the patch also resolves an issue with a
single UGI that gets into a hung state where the principal has been "forgotten"
and falls back to the login user, for which no ticket has been (or can be, in
the tested configuration) be acquired.
> 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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