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https://issues.apache.org/jira/browse/MAPREDUCE-6176?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yang Hao resolved MAPREDUCE-6176.
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Resolution: Duplicate
Target Version/s: (was: 2.4.0, 2.5.0, 2.4.1, 2.5.1, 2.5.2)
> To limit the map task number or reduce task 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: 2.4.0, 2.5.0, 2.4.1, 2.5.1, 2.5.2
> Reporter: Yang Hao
> Assignee: Yang Hao
> Labels: patch
> Attachments: MAPREDUCE-6176-branch2.4.0.patch
>
>
> As MapReduce is a batch framework of calculation, so people may want to run
> application A as well as application B 、C, and a limit resource be put on A.
> 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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