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From "Kihwal Lee (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7854) UGI getCurrentUser is not synchronized
Date Wed, 23 Nov 2011 19:41:40 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13156219#comment-13156219

Kihwal Lee commented on HADOOP-7854:

See HADOOP-7831 for the actual exception.
> 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:
>            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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