Wei Yan commented on YARN-2393:

bq. However, it is possible that the amShare becomes greater than what it 
should be for a potentially lower instantaneous fairshare at a later time. We 
could preempt AM containers as well, but need to tread this very carefully.
For the preemption, one concern is that "do we need to turn on the 
preemption.enabled". Users may be confused if AM containers killed, but the 
preemption is disabled.

> Fair Scheduler : Implement steady fair share
> --------------------------------------------
>                 Key: YARN-2393
>                 URL: https://issues.apache.org/jira/browse/YARN-2393
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: fairscheduler
>            Reporter: Ashwin Shankar
>            Assignee: Wei Yan
>         Attachments: YARN-2393-1.patch, YARN-2393-2.patch, YARN-2393-3.patch
> Static fair share is a fair share allocation considering all(active/inactive) 
> queues.It would be shown on the UI for better predictability of finish time 
> of applications.
> We would compute static fair share only when needed, like on queue creation, 
> node added/removed. Please see YARN-2026 for discussions on this. 

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