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https://issues.apache.org/jira/browse/HADOOP-9747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16246681#comment-16246681
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Bharat Viswanadham commented on HADOOP-9747:
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Hi [~daryn]
Thank You for providing patch.
One comment from me, is this patch removed the flag
HADOOP_TREAT_SUBJECT_EXTERNAL_KEY.
So, this configuration need to be removed from the CommonConfigurations.java
and also from core-default.xml
And also could you rebase your patch, as this is not cleanly applying to trunk.
> 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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