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: 0.20.2
Environment: cdh3u1 hadoop distribution, centos 5.5.
Reporter: Alexey Zotov
<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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