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Posted to mapreduce-issues@hadoop.apache.org by "Jason Lowe (JIRA)" <ji...@apache.org> on 2013/09/18 16:25:52 UTC

[jira] [Created] (MAPREDUCE-5513) ConcurrentModificationException in JobControl

Jason Lowe created MAPREDUCE-5513:
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             Summary: ConcurrentModificationException in JobControl
                 Key: MAPREDUCE-5513
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5513
             Project: Hadoop Map/Reduce
          Issue Type: Bug
    Affects Versions: 0.23.9, 2.1.0-beta
            Reporter: Jason Lowe


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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