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https://issues.apache.org/jira/browse/YARN-211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13495350#comment-13495350
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Radim Kolar commented on YARN-211:
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I know that it is currently controlled by percent and it can be configured per
queue. This is unsuitable if you need to limit number of running applications
to certain low number to work around primitive cluster scheduling in hadoop.
For example if you have nodes with 2 GPU units, then create queue with
maximum-running-tasks 1 or 2 and submit applications to that queue, there is
better chance that they will not run concurrently on one node.
Using percentage for configuration is tricky, its difficult to predict target
effect and it changes with number of nodes in cluster.
> Allow definition of max-active-applications per queue
> -----------------------------------------------------
>
> Key: YARN-211
> URL: https://issues.apache.org/jira/browse/YARN-211
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: capacityscheduler
> Reporter: Radim Kolar
> Attachments: capacity-maxactive.txt
>
>
> In some cases, automatic max-active is not enough, especially if you need
> less active tasks in given queue
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