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Posted to mapreduce-issues@hadoop.apache.org by "Yang Hao (JIRA)" <ji...@apache.org> on 2014/11/27 09:42:13 UTC

[jira] [Created] (MAPREDUCE-6176) Users should limit the number of an application

Yang Hao created MAPREDUCE-6176:
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             Summary: Users should limit the number of an application
                 Key: MAPREDUCE-6176
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6176
             Project: Hadoop Map/Reduce
          Issue Type: New Feature
          Components: mr-am, mrv2
    Affects Versions: 2.5.2, 2.5.1, 2.4.1, 2.5.0
            Reporter: Yang Hao
            Assignee: Yang Hao


As MapReduce is batch framework of calculation, so people may want to run application A as well as application B . A good way to do so is that we can limit the number of application's map task or reduce task. If we set mapreduce.map.num.max as M, then the map task number will not exceed M. At the same time, if we set mapreduce.map.num.max as R, then the reduce task number will not exceed R



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