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From "Harsh J (Reopened) (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (MAPREDUCE-1109) ConcurrentModificationException in jobtracker.jsp
Date Sun, 11 Mar 2012 16:45:59 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Harsh J reopened MAPREDUCE-1109:
--------------------------------


Actually, lemme correct myself. The JSP service, which was completely ignored in my debugging
here, seems to use the should-not-be-public runningJobs API that is not synchronized. Attaching
patch to fix it to call getRunningJobs(…) which is indeed synchronized.
                
> 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
>             Fix For: 1.0.0
>
>
> 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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