Jian He commented on YARN-3153:

As the 
  already explicitly mentions "specified as float", to keep it compatible, we 
may choose to do 1)

> Capacity Scheduler max AM resource limit for queues is defined as percentage 
> but used as ratio
> ----------------------------------------------------------------------------------------------
>                 Key: YARN-3153
>                 URL: https://issues.apache.org/jira/browse/YARN-3153
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>            Priority: Critical
> In existing Capacity Scheduler, it can limit max applications running within 
> a queue. The config is yarn.scheduler.capacity.maximum-am-resource-percent, 
> but actually, it is used as "ratio", in implementation, it assumes input will 
> be \[0,1\]. So now user can specify it up to 100, which makes AM can use 100x 
> of queue capacity. We should fix that.

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