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https://issues.apache.org/jira/browse/YARN-211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13495326#comment-13495326
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Thomas Graves commented on YARN-211:
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The number of active applications is controlled by maximum-am-resource-percent. 
(Maximum percent of resources in the cluster which can be used to run 
application masters)   Which is settable per queue also. It is a percent and 
not a direct #.
                
> Allow definition of max-active-tasks 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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