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https://issues.apache.org/jira/browse/MAPREDUCE-1109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harsh J resolved MAPREDUCE-1109.
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Resolution: Not A Problem
Fix Version/s: 1.0.0
This is no longer an issue in the current stable releases. The locking is
properly taken care of, and the accessor methods to jobs map all hold lock
before trying to work with it.
We've not seen this report come up in the past year as well.
> 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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