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From "Nathan Marz (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5758) Task attempt stopped shuffling and hung the job
Date Thu, 30 Apr 2009 22:23:31 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12704818#action_12704818
] 

Nathan Marz commented on HADOOP-5758:
-------------------------------------

Logs are already long gone. If it ever happens again I will post more information.

> Task attempt stopped shuffling and hung the job
> -----------------------------------------------
>
>                 Key: HADOOP-5758
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5758
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.18.3
>            Reporter: Nathan Marz
>
> I was running a job and one of the reducer task attempts got stuck during the shuffle
phase. The percentage complete froze at 33.1%, and the logs for the attempt looked like:
> 2009-04-29 15:21:24,431 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200904250602_2468_r_000024_0:
Got 0 new map-outputs & number of known map outputs is 0
> 2009-04-29 15:21:24,431 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200904250602_2468_r_000024_0
Scheduled 0 of 0 known outputs (0 slow hosts and 0 dup hosts)
> 2009-04-29 15:22:24,580 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200904250602_2468_r_000024_0
Need another 1 map output(s) where 0 is already in progress
> 2009-04-29 15:22:24,581 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200904250602_2468_r_000024_0:
Got 0 new map-outputs & number of known map outputs is 0
> 2009-04-29 15:22:24,581 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200904250602_2468_r_000024_0
Scheduled 0 of 0 known outputs (0 slow hosts and 0 dup hosts)
> 2009-04-29 15:23:24,692 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200904250602_2468_r_000024_0
Need another 1 map output(s) where 0 is already in progress
> 2009-04-29 15:23:24,693 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200904250602_2468_r_000024_0:
Got 0 new map-outputs & number of known map outputs is 0
> 2009-04-29 15:23:24,693 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200904250602_2468_r_000024_0
Scheduled 0 of 0 known outputs (0 slow hosts and 0 dup hosts)
> 2009-04-29 15:24:24,718 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200904250602_2468_r_000024_0
Need another 1 map output(s) where 0 is already in progress
> 2009-04-29 15:24:24,718 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200904250602_2468_r_000024_0:
Got 0 new map-outputs & number of known map outputs is 0
> 2009-04-29 15:24:24,719 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200904250602_2468_r_000024_0
Scheduled 0 of 0 known outputs (0 slow hosts and 0 dup hosts)
> 2009-04-29 15:25:24,742 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200904250602_2468_r_000024_0
Need another 1 map output(s) where 0 is already in progress
> 2009-04-29 15:25:24,743 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200904250602_2468_r_000024_0:
Got 0 new map-outputs & number of known map outputs is 0
> 2009-04-29 15:25:24,743 INFO org.apache.hadoop.mapred.ReduceTask: attempt_200904250602_2468_r_000024_0
Scheduled 0 of 0 known outputs (0 slow hosts and 0 dup hosts)
> The mappers and other reducers were long finished. When I manually killed the task attempt
process after 20 minutes of seeing it frozen, it restarted on another machine and succeeded
just fine.

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