Yufei Gu commented on YARN-4212:

Very glad to have this in. Thanks! 

> FairScheduler: Can't create a DRF queue under a FAIR policy queue
> -----------------------------------------------------------------
>                 Key: YARN-4212
>                 URL: https://issues.apache.org/jira/browse/YARN-4212
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Arun Suresh
>            Assignee: Yufei Gu
>              Labels: fairscheduler
>             Fix For: 2.9.0
>         Attachments: YARN-4212.002.patch, YARN-4212.003.patch, 
> YARN-4212.004.patch, YARN-4212.005.patch, YARN-4212.006.patch, 
> YARN-4212.007.patch, YARN-4212.008.patch, YARN-4212.009.patch, 
> YARN-4212.010.patch, YARN-4212.011.patch, YARN-4212.1.patch
> The Fair Scheduler, while performing a {{recomputeShares()}} during an 
> {{update()}} call, uses the parent queues policy to distribute shares to its 
> children.
> If the parent queues policy is 'fair', it only computes weight for memory and 
> sets the vcores fair share of its children to 0.
> Assuming a situation where we have 1 parent queue with policy 'fair' and 
> multiple leaf queues with policy 'drf', Any app submitted to the child queues 
> with vcore requirement > 1 will always be above fairshare, since during the 
> recomputeShare process, the child queues were all assigned 0 for fairshare 
> vcores.

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