Yufei Gu commented on YARN-6926:

Looking more deeply, this isn't a issue since method 
{{assignPreemptedContainers}} check node's preemption list first. Scheduler 
doesn't assign container if there is no item in preemption list. In that sense, 
scheduler doesn't assign preemption resource request on the node without 
preemption list. 

> FSSchedulerNode reservation conflict
> ------------------------------------
>                 Key: YARN-6926
>                 URL: https://issues.apache.org/jira/browse/YARN-6926
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: fairscheduler
>            Reporter: Miklos Szegedi
>            Assignee: Yufei Gu
> FSSchedulerNode reserves space for preemptor apps, but other nodes may 
> reserve normally, if there is not enough free space. This causes double 
> accounting and reservation.

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