Carlo Curino commented on YARN-4358:

As side effects, this patch also: 
* introduces tracking of reservation count (useful for future sharingpolicies, 
which limit the number of parallel jobs), 
* provides support for user-keyed queries of the plan
* fixes some issue with comparators of reservations (spotted in the context of 
other related patches) 

> Improve relationship between SharingPolicy and ReservationAgent
> ---------------------------------------------------------------
>                 Key: YARN-4358
>                 URL: https://issues.apache.org/jira/browse/YARN-4358
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: capacityscheduler, fairscheduler, resourcemanager
>            Reporter: Carlo Curino
>            Assignee: Carlo Curino
>         Attachments: YARN-4358.patch
> At the moment an agent places based on available resources, but has no 
> visibility to extra constraints imposed by the SharingPolicy. While not all 
> constraints are easily represented some (e.g., max-instantaneous resources) 
> are easily represented.

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