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From "Matt Foley (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-7854) UGI getCurrentUser is not synchronized
Date Mon, 28 Nov 2011 00:50:41 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-7854?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matt Foley updated HADOOP-7854:
-------------------------------

       Resolution: Fixed
    Fix Version/s: 1.0.0
           Status: Resolved  (was: Patch Available)

Marking this fixed in 1.0.0 (0.20.205.1), because this patch will prevent the problem from
recurring.

If further disposition is required (such as opening bug against JDK), please do so.

Should this be merged to trunk?
                
> 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: 1.0.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>             Fix For: 1.0.0
>
>         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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