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Posted to mapreduce-issues@hadoop.apache.org by "Yang Hao (JIRA)" <ji...@apache.org> on 2014/12/03 06:35:13 UTC

[jira] [Updated] (MAPREDUCE-5583) Ability to limit running map and reduce tasks

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5583?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yang Hao updated MAPREDUCE-5583:
--------------------------------
    Attachment: MAPREDUCE-5583-branch2.4.0.patch

> 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-branch2.4.0.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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