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From "Aaron T. Myers (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3096) Add a good way to control the number of map/reduce tasks per node
Date Mon, 26 Sep 2011 23:55:12 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13115045#comment-13115045
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Aaron T. Myers commented on MAPREDUCE-3096:
-------------------------------------------

Hi Arsen, to be completely clear, do you want to be able to limit the maximum number of concurrent
map/reduce tasks *from a single job* that run on a given node? Or the maximum number of concurrent
map/reduce tasks that run on a given node *across all jobs*?
                
> Add a good way to control the number of map/reduce tasks per node
> -----------------------------------------------------------------
>
>                 Key: MAPREDUCE-3096
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3096
>             Project: Hadoop Map/Reduce
>          Issue Type: Task
>            Reporter: Arsen Zahray
>             Fix For: 0.20.204.0
>
>
> Currently, controlling the number of map/reduce tasks is a hell.
> I've tried for it many times, and it doesn't work right. Also, I am not the only one
person, who seems to have this problem.
> There must be a better way to do it.
> Here's my proposal:
> add following functions to Job:
> setNumberOfMappersPerNode(int);
> setNumberOfReducersPerNode(int);
> setMaxMemoryPerMapper(int);
> setMaxMemoryPerReducer(int);

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