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https://issues.apache.org/jira/browse/HADOOP-9747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16146006#comment-16146006
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Junping Du commented on HADOOP-9747:
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bq. I did find one small gotcha when logging in directly from a subject. If
there's a keytab, it works fine, because the login module gets a TGT. If the
subject contains just a TGT, ex. storm auto-tgt, it fails to login.
Is this a potential regression? If so, may be we should fix this issue or defer
to 2.9? CC [~owen.omalley], [~jlowe].
> 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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