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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-172) Reducers stuck in 'sort'
Date Thu, 17 Jul 2014 16:57:07 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-172?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Allen Wittenauer resolved MAPREDUCE-172.
----------------------------------------

    Resolution: Fixed

I'm going to close this out as stale.  I suspect this is no longer an issue.

> Reducers stuck in 'sort'
> ------------------------
>
>                 Key: MAPREDUCE-172
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-172
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Arun C Murthy
>
> A couple of reduces seem stuck on a small 20-node cluster in the 'sort' phase for almost
an hour:
> TaskTracker logs:
> ------------------------
> 2007-03-28 14:13:46,471 INFO org.apache.hadoop.mapred.TaskTracker: task_0002_r_000005_0
0.33333334% reduce > sort
> 2007-03-28 14:13:46,478 INFO org.apache.hadoop.mapred.TaskTracker: task_0002_r_000009_0
0.33333334% reduce > sort
> 2007-03-28 14:13:47,476 INFO org.apache.hadoop.mapred.TaskTracker: task_0002_r_000005_0
0.33333334% reduce > sort
> 2007-03-28 14:13:47,483 INFO org.apache.hadoop.mapred.TaskTracker: task_0002_r_000009_0
0.33333334% reduce > sort
> ...
> ...
> ...
> 2007-03-28 15:06:04,376 INFO org.apache.hadoop.mapred.TaskTracker: task_0002_r_000005_0
0.33333334% reduce > sort
> 2007-03-28 15:06:04,411 INFO org.apache.hadoop.mapred.TaskTracker: task_0002_r_000009_0
0.33333334% reduce > sort
> 2007-03-28 15:06:05,379 INFO org.apache.hadoop.mapred.TaskTracker: task_0002_r_000005_0
0.33333334% reduce > sort
> 2007-03-28 15:06:05,414 INFO org.apache.hadoop.mapred.TaskTracker: task_0002_r_000009_0
0.33333334% reduce > sort
> Eventually the JobTracker declared the same TT 'lost' (presumably for no heartbeats):
> 2007-03-28 15:18:20,341 INFO org.apache.hadoop.mapred.JobTracker: Lost tracker 'tracker_XXX:9020'



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