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Posted to common-dev@hadoop.apache.org by "Doug Cutting (JIRA)" <ji...@apache.org> on 2006/03/16 01:05:59 UTC
[jira] Resolved: (HADOOP-82) JobTracker loses it:
NoSuchElementException
[ http://issues.apache.org/jira/browse/HADOOP-82?page=all ]
Doug Cutting resolved HADOOP-82:
--------------------------------
Fix Version: 0.1
Resolution: Fixed
I just committed this. Thanks, Michael!
> JobTracker loses it: NoSuchElementException
> -------------------------------------------
>
> Key: HADOOP-82
> URL: http://issues.apache.org/jira/browse/HADOOP-82
> Project: Hadoop
> Type: Bug
> Reporter: stack@archive.org
> Priority: Minor
> Fix For: 0.1
> Attachments: completes.patch
>
> On a number of occasions, JobTracker goes into a loop that it never recovers from. Over and over it prints the below to the jobtracker log.
> 060304 124522 Server handler 5 on 8010 call error: java.io.IOException: java.util.NoSuchElementException
> java.io.IOException: java.util.NoSuchElementException
> at java.util.TreeMap.key(TreeMap.java:433)
> at java.util.TreeMap.firstKey(TreeMap.java:287)
> at java.util.TreeSet.first(TreeSet.java:407)
> at org.apache.hadoop.mapred.TaskInProgress.getTaskToRun(TaskInProgress.java:428Timed out.org.apache.hadoop.fs.ChecksumException: Checksum error:/2/hadoop/nara/data/tmp/task_r_m80hob/all.1 at 1554810368 at
> org.apache.hadoop.fs.FSDataInputStream$Checker.verifySum(FSDataInputStream.java:122)
> at org.apache.hadoop.fs.FSDataInputStream$Checker.read(FSDataInputStream.java:98)
> at org.apache.hadoop.fs.FSDataInputStream$PositionCache.read(FSDataInputStream.java:158)
> at java.io.BufferedInputStream.fill(BufferedInputStream.java:218) at
> java.io.BufferedInputStream.read(BufferedInputStream.java:235) at
> org.apache.hadoop.fs.FSDataInputStream$Buffer.read(FSDataInputStream.java:210)
> at java.io.DataInputStream.readInt(DataInputStream.java:353) at
> org.apache.hadoop.io.SequenceFile$Reader.next(SequenceFile.java:367) at
> org.apache.hadoop.io.SequenceFile$Sorter$SortPass.run(SequenceFile.java:557)
> at org.apache.hadoop.io.SequenceFile$Sorter.sortPass(SequenceFile.java:523)
> at org.apache.hadoop.io.SequenceFile$Sorter.sort(SequenceFile.java:511)
> at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:254) at
> org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:666)
> I added debug to TIP#getTaskToRun so i could tell which TIP had empted its allotment of tasks. Below is extract from jobtracker log that shows sequence of events for TIP tip_fizr7m that lead up to JT losing it:
> 060314 203637 Adding task 'task_m_4d6ht0' to tip tip_fizr7m, for tracker 'tracker_41791' on ia109314.archive.org
> 060314 204758 Task 'task_m_4d6ht0' has been lost.
> 060314 204811 Adding task 'task_m_fb0wf0' to tip tip_fizr7m, for tracker 'tracker_70065' on ia109314.archive.org
> 060314 210118 Task 'task_m_fb0wf0' has been lost.
> 060314 210119 Adding task 'task_m_irar47' to tip tip_fizr7m, for tracker 'tracker_82285' on ia109324.archive.org
> 060314 211541 Taskid 'task_m_irar47' has finished successfully.
> 060314 211541 Task 'task_m_irar47' has completed.
> 060314 211543 Adding task 'task_m_qo1g69' to tip tip_fizr7m, for tracker 'tracker_97839' on ia109306.archive.org
> 060314 213004 Taskid 'task_m_qo1g69' has finished successfully.
> 060314 213004 Task 'task_m_qo1g69' has completed.
> 060314 213005 Adding task 'task_m_t0lnzk' to tip tip_fizr7m, for tracker 'tracker_57273' on ia109314.archive.org
> 060314 214118 Task 'task_m_t0lnzk' has been lost.
> So, we lose two, complete two, then lose a third.
> TIP should have been done on first completion.
> TIP accounting is off.
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