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From "Yang Hao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5583) Ability to limit running map and reduce tasks
Date Mon, 08 Dec 2014 02:53:13 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14237385#comment-14237385
] 

Yang Hao commented on MAPREDUCE-5583:
-------------------------------------

The configure mapreduce.job.running.reduces.limit in mapred-default.xml should be mapreduce.job.running.reduce.limit

> Ability to limit running map and reduce tasks
> ---------------------------------------------
>
>                 Key: MAPREDUCE-5583
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5583
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mr-am, mrv2
>    Affects Versions: 0.23.9, 2.1.1-beta
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>         Attachments: MAPREDUCE-5583-branch2.4.1.patch, MAPREDUCE-5583v1.patch, MAPREDUCE-5583v2.patch
>
>
> It would be nice if users could specify a limit to the number of map or reduce tasks
that are running simultaneously.  Occasionally users are performing operations in tasks that
can lead to DDoS scenarios if too many tasks run simultaneously (e.g.: accessing a database,
web service, etc.).  Having the ability to throttle the number of tasks simultaneously running
would provide users a way to mitigate issues with too many tasks on a large cluster attempting
to access a serivce at any one time.
> This is similar to the functionality requested by MAPREDUCE-224 and implemented by HADOOP-3412
but was dropped in mrv2.



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