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Date: Mon, 9 Jul 2012 02:30:34 +0000 (UTC)
From: "Harsh J (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Message-ID: <852237815.21127.1341801034758.JavaMail.jiratomcat@issues-vm>
Subject: [jira] [Resolved] (MAPREDUCE-1109) ConcurrentModificationException
 in jobtracker.jsp
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     [ https://issues.apache.org/jira/browse/MAPREDUCE-1109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Harsh J resolved MAPREDUCE-1109.
--------------------------------

    Resolution: Not A Problem

I've not seen this CME occur on the JT UI in 1.x nor heard any further reports of it either. I'm resolving as Not a Problem for now.
                
> 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: Harsh J
>         Attachments: MAPREDUCE-1109.patch, 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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