Xianyin Xin updated YARN-3652:
    Attachment: YARN-3652-preview.patch

A preview patch submitted.

> A SchedulerMetrics may be need for evaluating the scheduler's performance
> -------------------------------------------------------------------------
>                 Key: YARN-3652
>                 URL: https://issues.apache.org/jira/browse/YARN-3652
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager, scheduler
>            Reporter: Xianyin Xin
>         Attachments: YARN-3652-preview.patch
> As discussed in YARN-3630, a {{SchedulerMetrics}} may be need for evaluating 
> the scheduler's performance. The performance indexes includes #events waiting 
> for being handled by scheduler, the throughput, the scheduling delay and/or 
> other indicators.

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