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From "Daryn Sharp (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7854) UGI getCurrentUser is not synchronized
Date Wed, 23 Nov 2011 22:58:40 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13156372#comment-13156372
] 

Daryn Sharp commented on HADOOP-7854:
-------------------------------------

Stack trace is in the bug Kihwal mentioned: HADOOP-7831 
                
> UGI getCurrentUser is not synchronized
> --------------------------------------
>
>                 Key: HADOOP-7854
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7854
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 0.20.205.1
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>         Attachments: HADOOP-7854.patch
>
>
> Sporadic {{ConcurrentModificationExceptions}} are originating from {{UGI.getCurrentUser}}
when it needs to create a new instance.  The problem was specifically observed in a JT under
heavy load when a post-job cleanup is accessing the UGI while a new job is being processed.

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