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From "Daryn Sharp (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-7854) UGI getCurrentUser is not synchronized
Date Wed, 23 Nov 2011 18:13:43 GMT
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

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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