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Posted to mapreduce-issues@hadoop.apache.org by "Jason Lowe (JIRA)" <ji...@apache.org> on 2013/10/14 23:17:47 UTC

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

Jason Lowe created MAPREDUCE-5583:
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             Summary: 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: 2.1.1-beta, 0.23.9
            Reporter: Jason Lowe


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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