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From "Mike Smith (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1374) TaskTracker falls into an infinite loop.
Date Sat, 02 Jun 2007 18:35:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12500959
] 

Mike Smith commented on HADOOP-1374:
------------------------------------

I do have the similar problem on 0.12.3. My last reducer stucks in almost end of copying the
map output and it stays there for ever. But, when I kill that node and the task is assigned
to another node, the task will finish successfully. The stucked tasktracker keeps sending
this log:

2007-06-02 13:33:13,335 INFO org.apache.hadoop.mapred.TaskRunner: task_0023_r_000085_0 Got
3 known map output location(s); scheduling...
2007-06-02 13:33:13,335 INFO org.apache.hadoop.mapred.TaskRunner: task_0023_r_000085_0 Scheduled
0 of 3 known outputs (3 slow hosts and 0 dup hosts)
2007-06-02 13:33:14,034 INFO org.apache.hadoop.mapred.TaskTracker: task_0023_r_000085_0 0.33295453%
reduce > copy (2637 of 2640 at 0.00 MB/s) >
2007-06-02 13:33:15,044 INFO org.apache.hadoop.mapred.TaskTracker: task_0023_r_000085_0 0.33295453%
reduce > copy (2637 of 2640 at 0.00 MB/s) >
2007-06-02 13:33:16,054 INFO org.apache.hadoop.mapred.TaskTracker: task_0023_r_000085_0 0.33295453%
reduce > copy (2637 of 2640 at 0.00 MB/s) >
2007-06-02 13:33:17,064 INFO org.apache.hadoop.mapred.TaskTracker: task_0023_r_000085_0 0.33295453%
reduce > copy (2637 of 2640 at 0.00 MB/s) >
2007-06-02 13:33:18,074 INFO org.apache.hadoop.mapred.TaskTracker: task_0023_r_000085_0 0.33295453%
reduce > copy (2637 of 2640 at 0.00 MB/s) >
2007-06-02 13:33:18,343 INFO org.apache.hadoop.mapred.TaskRunner: task_0023_r_000085_0 Need
3 map output(s)
2007-06-02 13:33:18,344 INFO org.apache.hadoop.mapred.TaskRunner: task_0023_r_000085_0 Need
3 map output location(s)
2007-06-02 13:33:18,345 INFO org.apache.hadoop.mapred.TaskRunner: task_0023_r_000085_0 Got
0 new map outputs from jobtracker and 0 map outputs from previous failures


> 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
>            Assignee: Arun C Murthy
>             Fix For: 0.14.0
>
>         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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