Karthik Kambatla commented on YARN-3691:

The number of reservations should be per component and not per application? If 
an app is looking to get resources for 10 containers, it should be able to make 
reservations independently for each container. 

> FairScheduler: Limit number of reservations for a container
> -----------------------------------------------------------
>                 Key: YARN-3691
>                 URL: https://issues.apache.org/jira/browse/YARN-3691
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>            Reporter: Arun Suresh
>            Assignee: Arun Suresh
> Currently, It is possible to reserve resource for an app on all nodes. 
> Limiting this to possibly just a number of nodes (or a ratio of the total 
> cluster size) would improve utilization of the cluster and will reduce the 
> possibility of starving other apps.

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