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https://issues.apache.org/jira/browse/MAPREDUCE-734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12728733#action_12728733
]
Karam Singh commented on MAPREDUCE-734:
---------------------------------------
Stack trace -:
2009-07-08 13:34:18,260 INFO org.apache.hadoop.ipc.Server: IPC Server handler
49 on 50300, call
heartbeat(org.apache.hadoop.mapred.tasktrackersta...@61415858, false, false,
true, 7367) from <host:port>: error: java.io.IOException:
java.util.ConcurrentModificationException
java.io.IOException: java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
at java.util.HashMap$KeyIterator.next(HashMap.java:828)
at
org.apache.hadoop.mapred.JobInProgress.cancelReservedSlots(JobInProgress.java:2361)
at
org.apache.hadoop.mapred.JobInProgress.jobComplete(JobInProgress.java:2267)
at
org.apache.hadoop.mapred.JobInProgress.completedTask(JobInProgress.java:2213)
at
org.apache.hadoop.mapred.JobInProgress.updateTaskStatus(JobInProgress.java:952)
at
org.apache.hadoop.mapred.JobTracker.updateTaskStatuses(JobTracker.java:3899)
at
org.apache.hadoop.mapred.JobTracker.processHeartbeat(JobTracker.java:3090)
at org.apache.hadoop.mapred.JobTracker.heartbeat(JobTracker.java:2828)
at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:508)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:959)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:955)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:953)
> 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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