[ https://issues.apache.org/jira/browse/HADOOP-7854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13160557#comment-13160557
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Hudson commented on HADOOP-7854:
--------------------------------
Integrated in Hadoop-Common-0.23-Commit #238 (See [https://builds.apache.org/job/Hadoop-Common-0.23-Commit/238/])
Merged r1208926 from trunk for HADOOP-7854.
jitendra : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1208929
Files :
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/UserGroupInformation.java
> 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-trunk.patch, 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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