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https://issues.apache.org/jira/browse/YARN-4104?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wangda Tan updated YARN-4104:
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Parent Issue: YARN-5437 (was: YARN-4091)
> dryrun of schedule for diagnostic and tenant's complain
> -------------------------------------------------------
>
> Key: YARN-4104
> URL: https://issues.apache.org/jira/browse/YARN-4104
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: scheduler
> Reporter: Hong Zhiguo
> Assignee: Hong Zhiguo
> Priority: Minor
>
> We have more than 1 thousand queues and several hundreds of tenants in a busy
> cluster. We get a lot of complains/questions from owner/operator of queues
> about "Why my queue/app can't get resource for a long while? "
> It's really hard to answer such questions.
> So we added a diagnostic REST endpoint
> "/ws/v1/cluster/schedule/dryrun/{parentQueueName}" which returns the sorted
> list of it's children according to it's SchedulingPolicy.getComparator().
> All scheduling parameters of the children are also displayed, such as
> minShare, usage, demand, weight, priority etc.
> Usually we just call "/ws/v1/cluster/schedule/dryrun/root", and the result
> self-explains to the questions.
> I feel it's really useful for multi-tenant clusters, and hope it could be
> merged into the mainline.
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