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https://issues.apache.org/jira/browse/MAPREDUCE-63?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13422949#comment-13422949
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jinseng lin commented on MAPREDUCE-63:
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I encounter this problem too. My cluster relies on the /etc/hosts file to
resolve host name and my fault causing this problem is that there is a wrong
record in the /etc/hosts file.
After correcting the wrong record and then the problem is solved.
> TaskTracker falls into an infinite loop.
> ----------------------------------------
>
> Key: MAPREDUCE-63
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-63
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Konstantin Shvachko
> Assignee: Arun C Murthy
> Attachments: DataNode1.log, DataNode2.log, JobTracker.log,
> NameNode.log, TaskTracker1.log, TaskTracker2.log, TestDFSIO.log,
> hadoop-1374-yunhong.tar.gz
>
>
> 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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