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From "Jeff Bean (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-2905) Allow mapred.fairscheduler.assignmultple to be set per job
Date Mon, 29 Aug 2011 17:20:37 GMT
Allow mapred.fairscheduler.assignmultple to be set per job
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                 Key: MAPREDUCE-2905
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2905
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: contrib/fair-share
            Reporter: Jeff Bean


We encountered a situation where in the same cluster, large jobs benefit from mapred.fairscheduler.assignmultiple,
but small jobs with small numbers of mappers do not: the mappers all clump to fully occupy
just a few nodes, which causes those nodes to saturate and bottleneck. The desired behavior
is to round-robin spread the job across more nodes.

It'd be nice developers can set a param similar to mapred.fairscheduler.assignmultiple on
a per-job basis to better control the task allocation of a particular job.

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