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https://issues.apache.org/jira/browse/MAPREDUCE-734?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hemanth Yamijala updated MAPREDUCE-734:
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    Attachment: MAPREDUCE-734-20.patch

Patch (MAPREDUCE-734-20.patch) for Yahoo! Hadoop distribution. The previous one 
had a minor error preventing compilation. Verified that this compiles fine. 
Also ran capacity scheduler tests for sanity.

> 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
>    Affects Versions: 0.21.0
>            Reporter: Karam Singh
>            Assignee: Arun C Murthy
>             Fix For: 0.21.0
>
>         Attachments: MAPREDUCE-734-1.patch, MAPREDUCE-734-2.patch, 
> MAPREDUCE-734-20.patch, MAPREDUCE-734-ydist.patch, 
> MAPREDUCE-734_0_20090708.patch, MAPREDUCE-734_0_20090708_yhadoop20.patch
>
>
> 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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