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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7854) UGI getCurrentUser is not synchronized
Date Wed, 23 Nov 2011 18:27:40 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13156027#comment-13156027
] 

Hadoop QA commented on HADOOP-7854:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12504902/HADOOP-7854.patch
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    -1 patch.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/399//console

This message is automatically generated.
                
> 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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