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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1252) Shuffle deadlocks on wrong number of maps
Date Tue, 01 Dec 2009 01:07:21 GMT
Shuffle deadlocks on wrong number of maps
-----------------------------------------

                 Key: MAPREDUCE-1252
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1252
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: task
    Affects Versions: 0.21.0, 0.22.0
            Reporter: Owen O'Malley
            Assignee: Owen O'Malley
            Priority: Blocker
             Fix For: 0.21.0, 0.22.0
         Attachments: mr-1252.patch

The new shuffle assumes that the number of maps is correct. The new JobSubmitter sets the
old value. Something misfires in the middle causing:

09/12/01 00:00:15 WARN conf.Configuration: mapred.job.split.file is deprecated. Instead, use
mapreduce.job.splitfile
09/12/01 00:00:15 WARN conf.Configuration: mapred.map.tasks is deprecated. Instead, use mapreduce.job.maps

But my reduces got stuck at 2 maps / 12 when there were only 2 maps in the job.


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