[HADOOP-1060] IndexOutOfBoundsException in JobInProgress.updateTaskStatus leads to hung jobs

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.12.0
• Fix Version/s: 0.12.1
• Assignee: Arun Murthy
• Reporter: Arun Murthy
• Created: 03/Mar/07 00:43
• Updated: 08/Jul/09 16:52
• Resolved: 07/Mar/07 22:36

Description

When the JobTracker detects that a TaskTracker is 'lost' and tries to fail the incomplete tasks and the completed map tasks it fails with:
2007-03-03 00:38:24,056 ERROR org.apache.hadoop.mapred.JobTracker: Tracker Expiry Thread got exception: java.lang.IndexOutOfBoundsException: Index: 310, Size: 307
at java.util.ArrayList.RangeCheck(ArrayList.java:546)
at java.util.ArrayList.get(ArrayList.java:321)
at org.apache.hadoop.mapred.JobInProgress.updateTaskStatus(JobInProgress.java:342)
at org.apache.hadoop.mapred.JobInProgress.failedTask(JobInProgress.java:862)
at org.apache.hadoop.mapred.JobTracker.lostTaskTracker(JobTracker.java:1637)
at org.apache.hadoop.mapred.JobTracker$ExpireTrackers.run(JobTracker.java:269)
at java.lang.Thread.run(Thread.java:595)

Another instance of same exception:
2007-03-05 07:44:42,869 INFO org.apache.hadoop.ipc.Server: IPC Server handler 9 on 50020 call error: java.io.IOException: java.lang.IndexOutOfBoundsException: Index: 12341
215, Size: 83189
java.io.IOException: java.lang.IndexOutOfBoundsException: Index: 12341215, Size: 83189
at java.util.ArrayList.RangeCheck(ArrayList.java:547)
at java.util.ArrayList.get(ArrayList.java:322)
at org.apache.hadoop.mapred.JobInProgress.updateTaskStatus(JobInProgress.java:342)
at org.apache.hadoop.mapred.JobTracker.updateTaskStatuses(JobTracker.java:1611)
at org.apache.hadoop.mapred.JobTracker.processHeartbeat(JobTracker.java:1163)
at org.apache.hadoop.mapred.JobTracker.heartbeat(JobTracker.java:1037)
at sun.reflect.GeneratedMethodAccessor5.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$Server.call(RPC.java:336)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:559)

This means that the tasks aren't updated correctly and the JT just assumes the task is running and never restarts the task... thereby leading to a hung job.

Issue Links

• is blocked by: HADOOP-1077 Race condition in fetching map outputs (might lead to hung reduces)