Wangda Tan commented on YARN-3630:

Thanks for sharing your thoughts, I think we can add an interface to Dispatcher 
to get #events waiting.
We can add more details of waiting events for different components, but as the 
first step, I think we can add it for scheduler.

Maybe we can create a SchedulerMetrics to track scheduler internal fields, 
sounds like a plan? [~kasha].

> 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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