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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9747) Reduce unnecessary UGI synchronization
Date Wed, 29 Mar 2017 18:05:42 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15947615#comment-15947615
] 

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

Branch-2 failures due to 8 allowing association of a principal with a keytab, unlike 7.  In
practice the subject contains a KerberosPrincipal and Keytab.  I  opted to extract the keytab's
principal as fallback if a KerberosPrincipal is not present.  It's a "nice to have" but I'll
just remove it.  It shouldn't impede a review (hint, hint, watchers) because I'll just be
deleting a handful of lines.

> 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.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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