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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-3969) ConcurrentModificationException in JobHistory.java
Date Sat, 12 May 2012 12:38:48 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Harsh J resolved MAPREDUCE-3969.
--------------------------------

    Resolution: Not A Problem

It appears that such a scenario can't arise. Since I've not seen this issue again after applying
the undocumented fixes to my local branch, I'm re-resolving this.

Thanks Arun and Tom!
                
> ConcurrentModificationException in JobHistory.java
> --------------------------------------------------
>
>                 Key: MAPREDUCE-3969
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3969
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 0.20.203.0
>         Environment: cdh3u1 hadoop distribution, centos 5.5.
>            Reporter: Alexey Zotov
>            Assignee: Harsh J
>         Attachments: MAPREDUCE-3969.patch
>
>
> {code}
> 2012-03-01 04:24:47,479 INFO org.apache.hadoop.mapred.JobInProgress: Task 'attempt_201202150320_3709_m_000148_0'
has completed task_201202150320_3709_m_000148 successfully.
> 2012-03-01 04:24:47,479 INFO org.apache.hadoop.mapred.JobHistory: Logging failed for
job job_201202150320_3709removing PrintWriter from FileManager
> 2012-03-01 04:24:47,479 INFO org.apache.hadoop.ipc.Server: IPC Server handler 5 on 8021,
call heartbeat(org.apache.hadoop.mapred.TaskTrackerStatus@61069281, false, false, true, -21317)
from <TASKTRACKER-IP>:450
> 41: error: java.io.IOException: java.util.ConcurrentModificationException
> java.io.IOException: java.util.ConcurrentModificationException
>         at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
>         at java.util.AbstractList$Itr.next(AbstractList.java:343)
>         at org.apache.hadoop.mapred.JobHistory.log(JobHistory.java:591)
>         at org.apache.hadoop.mapred.JobHistory$MapAttempt.logFinished(JobHistory.java:1735)
>         at org.apache.hadoop.mapred.JobInProgress.completedTask(JobInProgress.java:2515)
>         at org.apache.hadoop.mapred.JobInProgress.updateTaskStatus(JobInProgress.java:1200)
>         at org.apache.hadoop.mapred.JobTracker.updateTaskStatuses(JobTracker.java:4539)
>         at org.apache.hadoop.mapred.JobTracker.processHeartbeat(JobTracker.java:3503)
>         at org.apache.hadoop.mapred.JobTracker.heartbeat(JobTracker.java:3202)
>         at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:597)
>         at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:557)
>         at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1434)
>         at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1430)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at javax.security.auth.Subject.doAs(Subject.java:396)
>         at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1127)
>         at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1428)
> {code}
> Task task_201202150320_3709_m_000148 was being marked as failed (but had not been restarted)
at that moment and job execution was being freezed.

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