[MAPREDUCE-734] java.util.ConcurrentModificationException observed in unreserving slots for HiRam Jobs

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.21.0
• Fix Version/s: 0.21.0
• Component/s: capacity-sched
• Hadoop Flags: Reviewed
• Assignee: Arun Murthy
• Reporter: Karam Singh
• Created: 08/Jul/09 15:00
• Updated: 24/Aug/10 21:14
• Resolved: 09/Jul/09 12:32

Description

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