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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9747) Reduce unnecessary UGI synchronization
Date Tue, 29 Aug 2017 19:42:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16145977#comment-16145977
] 

Daryn Sharp commented on HADOOP-9747:
-------------------------------------

I'm actively working on this.  I backported to 2.8, which wasn't too hard, mostly that exception
types changed.

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.  Taking care of that use case.

> 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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