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From "Eric Payne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9747) Reduce unnecessary UGI synchronization
Date Fri, 25 Aug 2017 16:03:01 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16141807#comment-16141807
] 

Eric Payne commented on HADOOP-9747:
------------------------------------

[~daryn], I started to commit this, but I ran into a couple of issues:

# If this fix needs to go into branch-2.8, we may need a separate 2.8 patch. I tried applying
the branch-2 patch to branch-2.8, and there were several conflicts in {{UserGroupInformation.java}}
# {{HADOOP-9747.2.branch-2.patch}} does not apply cleanly to branch-2. It's just a minor import
conflict that I could fix myself, but as long as you need to address the branch-2.8 conflicts...

> 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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