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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5513) ConcurrentModificationException in JobControl
Date Fri, 27 Sep 2013 14:18:16 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13779966#comment-13779966
] 

Hudson commented on MAPREDUCE-5513:
-----------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk #1561 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1561/])
MAPREDUCE-5513. ConcurrentModificationException in JobControl. Contributed by Robert Parker
(jlowe: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1526688)
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/jobcontrol/JobControl.java

                
> 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, 2.1.2-beta
>
>         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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