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https://issues.apache.org/jira/browse/HADOOP-1253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12489365
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Hadoop QA commented on HADOOP-1253:
-----------------------------------
Integrated in Hadoop-Nightly #60 (See
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Nightly/60/)
> ConcurrentModificationException and NPE in JobControl
> -----------------------------------------------------
>
> Key: HADOOP-1253
> URL: https://issues.apache.org/jira/browse/HADOOP-1253
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.12.3
> Reporter: Johan Oskarson
> Priority: Minor
> Fix For: 0.13.0
>
> Attachments: hadoop-jobcontrol-v2.patch
>
>
> toArrayList(Hashtable jobs) in JobControl.java isn't synchronized and it
> resulted in a ConcurrentModificationException.
> checkRunningState in Job.java can throw a NullPointerException if running =
> jc.getJob(this.mapredJobID) fails, leaving running null.
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