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