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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5583) Ability to limit running map and reduce tasks
Date Mon, 24 Nov 2014 22:31:13 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14223660#comment-14223660
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Jason Lowe commented on MAPREDUCE-5583:
---------------------------------------

TestDbClasses failure appears to be unrelated.  I can't reproduce it locally, and the only
changes in the patch that would be exposed to hadoop-mapreduce-client-core are the addition
of new properties to MRJobConfig and mapred-default.xml.  The code that acts on those new
properties is above hadoop-mapreduce-client-core.  I suspect it's a sporadic failure due to
a very aggressive timeout (only 1 second).  Filed MAPREDUCE-6172 to track that issue.

> 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-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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