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https://issues.apache.org/jira/browse/MAPREDUCE-5513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13900721#comment-13900721
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Jason Lowe commented on MAPREDUCE-5513:
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Note that this is still occurring, see MAPREDUCE-5757.
> ConcurrentModificationException in JobControl
> ---------------------------------------------
>
> Key: MAPREDUCE-5513
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5513
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 2.1.0-beta, 0.23.9
> Reporter: Jason Lowe
> Assignee: Robert Parker
> Fix For: 3.0.0, 0.23.10, 2.2.0
>
> Attachments: MAPREDUCE-5513-1.patch
>
>
> JobControl.toList is locking individual lists to iterate them, but those
> lists can be modified elsewhere without holding the list lock. The locking
> approaches are mismatched, with toList holding the lock on the actual list
> object while other methods hold the JobControl lock when modifying the lists.
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