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From "Evert Lammerts (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-2636) Scheduling over disks horizontally
Date Fri, 01 Jul 2011 08:30:29 GMT
Scheduling over disks horizontally
----------------------------------

                 Key: MAPREDUCE-2636
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2636
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: job submission
            Reporter: Evert Lammerts
            Priority: Minor


Based on this message: http://mail-archives.apache.org/mod_mbox/hadoop-hdfs-user/201106.mbox/browser

The JT schedules tasks on nodes based on metadata it gets from the NN. The namenode does not
know on which disk a block resides. It might happen that on a node running 4 tasks, all read
from the same disk. This can affect performance.

An optimization might be to schedule horizontally over disks instead of nodes. Any ideas?

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