Carlo Curino commented on YARN-4360:

Rebasing after YARN-3454 got committed. A point of discussion: The 
configuration could be either choosing "GreedyReservationAgent" and set the 
allocation direction, or have an other top-level class (e.g., 
"LeftGreedyReservationAgent") that invokes the same "internals" but configured 
for left-to-right allocation. One less config param, one more class... thoughts?

> Improve GreedyReservationAgent to support "early" allocations, and 
> performance improvements 
> --------------------------------------------------------------------------------------------
>                 Key: YARN-4360
>                 URL: https://issues.apache.org/jira/browse/YARN-4360
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: capacityscheduler, fairscheduler, resourcemanager
>    Affects Versions: 2.8.0
>            Reporter: Carlo Curino
>            Assignee: Carlo Curino
>         Attachments: YARN-4360.2.patch, YARN-4360.patch
> The GreedyReservationAgent allocates "as late as possible". Per various 
> conversations, it seems useful to have a mirror behavior that allocates as 
> early as possible. Also in the process we leverage improvements from 
> YARN-4358, and implement an RLE-aware StageAllocatorGreedy(RLE), which 
> significantly speeds up allocation.

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