Wei Shao commented on YARN-3806:

Hi Karthik, see proposal and comments above for why this proposal is came up. I 
am aware of FairScheduler design and proposal of YARN-3306. Thanks!

> Proposal of Generic Scheduling Framework for YARN
> -------------------------------------------------
>                 Key: YARN-3806
>                 URL: https://issues.apache.org/jira/browse/YARN-3806
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: scheduler
>            Reporter: Wei Shao
>         Attachments: ProposalOfGenericSchedulingFrameworkForYARN-V1.2.pdf
> Currently, a typical YARN cluster runs many different kinds of applications: 
> production applications, ad hoc user applications, long running services and 
> so on. Different YARN scheduling policies may be suitable for different 
> applications. For example, capacity scheduling can manage production 
> applications well since application can get guaranteed resource share, fair 
> scheduling can manage ad hoc user applications well since it can enforce 
> fairness among users. However, current YARN scheduling framework doesn’t have 
> a mechanism for multiple scheduling policies work hierarchically in one 
> cluster.
> YARN-3306 talked about many issues of today’s YARN scheduling framework, and 
> proposed a per-queue policy driven framework. In detail, it supported 
> different scheduling policies for leaf queues. However, support of different 
> scheduling policies for upper level queues is not seriously considered yet. 
> A generic scheduling framework is proposed here to address these limitations. 
> It supports different policies (fair, capacity, fifo and so on) for any queue 
> consistently. The proposal tries to solve many other issues in current YARN 
> scheduling framework as well.
> Two new proposed scheduling policies YARN-3807 & YARN-3808 are based on 
> generic scheduling framework brought up in this proposal.

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