[MAPREDUCE-3969] ConcurrentModificationException in JobHistory.java

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: 0.20.203.0

Environment

cdh3u1 hadoop distribution, centos 5.5.

• Assignee: Harsh J
• Reporter: Aleksei Zotov
• Created: 05/Mar/12 06:12
• Updated: 12/May/12 12:37
• Resolved: 12/May/12 12:37

Description

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)

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.