Xianyin Xin commented on YARN-3630:

Thanks [~kasha] and [~leftnoteasy]. Indeed the waiting events in the scheduler 
event handler queue is an important index to show the scheduler's load. Now the 
queue is a private variable of the inner class {{SchedulerEventDispatcher}} and 
it can't be visited from outer space, should we add some methods in 
{{ClusterMetrics}} or other monitor classes to get the queue information? If we 
show the events in web UI, maybe we should also consider which type information 
could be shown, e.g., #events? #events of each app? #events of node update? or 
something like this.

> YARN should suggest a heartbeat interval for applications
> ---------------------------------------------------------
>                 Key: YARN-3630
>                 URL: https://issues.apache.org/jira/browse/YARN-3630
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager, scheduler
>    Affects Versions: 2.7.0
>            Reporter: Zoltán Zvara
>            Assignee: Xianyin Xin
>            Priority: Minor
> It seems currently applications - for example Spark - are not adaptive to RM 
> regarding heartbeat intervals. RM should be able to suggest a desired 
> heartbeat interval to applications.

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