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