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https://issues.apache.org/jira/browse/HADOOP-2573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12557724#action_12557724
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Doug Cutting commented on HADOOP-2573:
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This addresses issues raised in HADOOP-2510.
> limit running tasks per job
> ---------------------------
>
> Key: HADOOP-2573
> URL: https://issues.apache.org/jira/browse/HADOOP-2573
> Project: Hadoop
> Issue Type: New Feature
> Components: mapred
> Reporter: Doug Cutting
> Fix For: 0.17.0
>
>
> 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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