You are viewing a plain text version of this content. The canonical link for it is here.

Posted to mapreduce-issues@hadoop.apache.org by "Allen Wittenauer (JIRA)" <ji...@apache.org> on 2014/07/17 21:39:05 UTC

[jira] [Resolved] (MAPREDUCE-224) limit running tasks per job

     [ https://issues.apache.org/jira/browse/MAPREDUCE-224?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Allen Wittenauer resolved MAPREDUCE-224.
----------------------------------------

    Resolution: Duplicate

I'm going to close this out as a duplicate of MAPREDEUCE-5583.

> limit running tasks per job
> ---------------------------
>
>                 Key: MAPREDUCE-224
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-224
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>            Reporter: Doug Cutting
>
> It should be possible to specify a limit to the number of tasks per job permitted to run simultaneously.  If, for example, you have a cluster of 50 nodes, with 100 map task slots and 100 reduce task slots, and the configured limit is 25 simultaneous tasks/job, then four or more jobs will be able to run at a time.  This will permit short jobs to pass longer-running jobs.  This also avoids some problems we've seen with HOD, where nodes are underutilized in their tail, and it should permit improved input locality.



--
This message was sent by Atlassian JIRA
(v6.2#6252)