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https://issues.apache.org/jira/browse/HADOOP-1374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12498929
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Owen O'Malley commented on HADOOP-1374:
---------------------------------------
One more set of information:
1. In the web/ui the task shows as running both in the jobtracker AND
tasktracker.
2. The logs from the unit test show that the task tracker got both the final
status update (100%) and the done for the stuck map:
{code}
[junit] 2007-05-24 21:04:03,744 INFO mapred.TaskTracker
(TaskTracker.java:reportProgress(1286)) - task_0001_m_000009_0 1.0% Generated
99901 samples.
[junit] 2007-05-24 21:04:03,744 INFO mapred.TaskTracker
(TaskTracker.java:reportDone(1336)) - Task task_0001_m_000009_0 is done.
{code}
I've looked through the locking in the TaskTracker for the status messages and
it looked right to me. I must be missing something.
> TaskTracker falls into an infinite loop.
> ----------------------------------------
>
> Key: HADOOP-1374
> URL: https://issues.apache.org/jira/browse/HADOOP-1374
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.12.3
> Reporter: Konstantin Shvachko
> Assigned To: Arun C Murthy
> Priority: Blocker
> Fix For: 0.13.0
>
> Attachments: DataNode1.log, DataNode2.log, JobTracker.log,
> NameNode.log, TaskTracker1.log, TaskTracker2.log, TestDFSIO.log
>
>
> All maps had been completed successfully. I had only one reduce task during
> which
> TaskTracker infinitely outputs:
> 07/05/15 19:35:41 INFO mapred.TaskTracker: task_0001_r_000000_0 0.16666667%
> reduce > copy (4 of 8 at 0.00 MB/s) >
> 07/05/15 19:35:42 INFO mapred.TaskTracker: task_0001_r_000000_0 0.16666667%
> reduce > copy (4 of 8 at 0.00 MB/s) >
> 07/05/15 19:35:43 INFO mapred.TaskTracker: task_0001_r_000000_0 0.16666667%
> reduce > copy (4 of 8 at 0.00 MB/s) >
> 07/05/15 19:35:44 INFO mapred.TaskTracker: task_0001_r_000000_0 0.16666667%
> reduce > copy (4 of 8 at 0.00 MB/s) >
> 07/05/15 19:35:45 INFO mapred.TaskTracker: task_0001_r_000000_0 0.16666667%
> reduce > copy (4 of 8 at 0.00 MB/s) >
> JobTracker does not log anything about task task_0001_r_000000_0 except for
> 07/05/15 19:49:01 INFO mapred.JobTracker: Adding task 'task_0001_r_000000_0'
> to tip tip_0001_r_000000, for tracker 'tracker_my-host.com:50050'
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