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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9747) Reduce unnecessary UGI synchronization
Date Fri, 19 Jan 2018 18:33:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16332706#comment-16332706

Daryn Sharp commented on HADOOP-9747:

Will post a branch-2 patch if this version is deemed acceptable.  As mentioned before, all
"intelligent" studying of the subject is gone.  It just tracks explicitly principal, keytab,
ticket cache used during login.  Ensures those parameters are used during relogin.  Removes
all the synchronization.  Ignores "external" subjects that lack a User principal not created
by the UGI.

> 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-trunk-03.patch, HADOOP-9747-trunk.01.patch, HADOOP-9747-trunk.02.patch,
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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