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https://issues.apache.org/jira/browse/YARN-3652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14561210#comment-14561210
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Varun Vasudev commented on YARN-3652:
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My apologies for the delay [~xinxianyin]. We do need a SchedulerMetrics class.
The general idea is that SchedulerHealth should pick up values from the
SchedulerMetrics class but that the SchedulerMetrics class should ideally
provide more information. As an example, the SchedulerHealth cares about the
number of reserved containers, which the SchedulerMetrics class should provide.
Ideally, though, the SchedulerMetrics class would also give me some extra
information such as the mean, the distribution and the variance of the the
number of reserved containers.
I think purely for the purposes of YARN-3630, you should use modify the
SchedulerHealth class to expose the number of waiting events, but we can
independently work on a SchedulerMetrics class as well.
> 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
>
> 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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