About yarn.scheduler.capacity..disable_preemption

[Todd]

Hi,
There is a configuration property 
yarn.scheduler.capacity.<queue-path>.disable_preemption that can be configured 
on a queue.
My question is when I set this property on root.A,does it mean that queue A's 
resources can't be preempted by other queues, or queue A can't  
preempt resources from other queues?

Thanks!