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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-5583) Ability to limit running map and reduce tasks
Date Thu, 23 Apr 2015 04:37:41 GMT

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

Harsh J updated MAPREDUCE-5583:
-------------------------------
    Target Version/s:   (was: 2.4.0, 2.7.0)
        Release Note: 
This introduces two new MR2 job configs, mentioned below, which allow users to control the
maximum simultaneously-running tasks of the submitted job, across the cluster:

* mapreduce.job.running.map.limit (default: 0, for no limit)
* mapreduce.job.running.reduce.limit (default: 0, for no limit)

This is controllable at a per-job level.

> 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
>             Fix For: 2.7.0
>
>         Attachments: MAPREDUCE-5583-branch2.4.1.patch, MAPREDUCE-5583v1.patch, MAPREDUCE-5583v2.patch,
MAPREDUCE-5583v3.patch, MAPREDUCE-5583v4.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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