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https://issues.apache.org/jira/browse/MAPREDUCE-734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12728762#action_12728762
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Arun C Murthy commented on MAPREDUCE-734:
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Karam, do you know if you submitted _any_ jobs (in particular high-ram jobs)
with zero maps and zero reduces before you saw this?
> java.util.ConcurrentModificationException observed in unreserving slots for
> HiRam Jobs
> --------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-734
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-734
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: contrib/capacity-sched
> Reporter: Karam Singh
>
> Ran jobs out which 3 were HiRAM, the job were not removed from scheduler
> queue even after they successfully completed
> hadoop queue -info queue -showJobs displays somwthing like -:
> job_200907080724_0031 2 1247059146868 username NORMAL 0 running
> map tasks using 0 map slots. 0 additional slots reserved. 0 running reduce
> tasks using 0 reduce slots. 60 additional slots reserved.
> job_200907080724_0030 2 1247059146972 username NORMAL 0 running
> map tasks using 0 map slots. 0 additional slots reserved. 0 running reduce
> tasks using 0 reduce slots. 60 additional slots reserved.
> But it does not block anything, but seems like zombie process of system
> Jobtracker log show java.util.ConcurrentModificationException
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