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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2573) limit running tasks per job
Date Wed, 03 Jun 2009 08:38:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12715867#action_12715867
] 

Tom White commented on HADOOP-2573:
-----------------------------------

I think this is covered by HADOOP-5170. If so, we can close this issue as a duplicate.

> limit running tasks per job
> ---------------------------
>
>                 Key: HADOOP-2573
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2573
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: mapred
>            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.

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