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From "Harsh J (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-1109) ConcurrentModificationException in jobtracker.jsp
Date Mon, 19 Mar 2012 20:17:39 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13232857#comment-13232857
] 

Harsh J commented on MAPREDUCE-1109:
------------------------------------

Thanks for the review Tom.

{code}
test-patch:
    [exec] -1 overall.
    [exec]
    [exec]     +1 @author.  The patch does not contain any @author tags.
    [exec]
    [exec]     -1 tests included. The patch doesn't appear to include any new or modified
tests.
    [exec]           Please justify why no new tests are needed for this patch.
    [exec]           Also please list what manual steps were performed to verify this patch.
    [exec]
    [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.
    [exec]
    [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler
warnings.
    [exec]
    [exec]     +1 findbugs.  The patch does not introduce any new Findbugs warnings.
    [exec]
    [exec]     +1 release audit.  The applied patch does not increase the total number of
release audit warnings.
{code}
                
> ConcurrentModificationException in jobtracker.jsp
> -------------------------------------------------
>
>                 Key: MAPREDUCE-1109
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1109
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobtracker
>    Affects Versions: 0.20.1
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>         Attachments: MAPREDUCE-1109.patch
>
>
> The jobtracker.jsp invoked methods tracker.runningJobs(), tracker.completedJobs() and
tracker.failedJobs() but these methods are not synchronized and can cause ConcurrentModificationException
if the JT is concurrently changing the contents of these datastructures.

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