Wangda Tan updated YARN-6538:
    Issue Type: Sub-task  (was: Bug)
        Parent: YARN-8159

> Inter Queue preemption is not happening when DRF is configured
> --------------------------------------------------------------
>                 Key: YARN-6538
>                 URL: https://issues.apache.org/jira/browse/YARN-6538
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: capacity scheduler, scheduler preemption
>    Affects Versions: 2.8.0
>            Reporter: Sunil G
>            Assignee: Sunil G
>            Priority: Major
> Cluster capacity of <memory:3TB, vCores:168>. Here memory is more and vcores 
> are less. If applications have more demand, vcores might be exhausted. 
> Inter queue preemption ideally has to be kicked in once vcores is over 
> utilized. However preemption is not happening.
> Analysis:
> In {{AbstractPreemptableResourceCalculator.computeFixpointAllocation}}, 
> {code}
>     // assign all cluster resources until no more demand, or no resources are
>     // left
>     while (!orderedByNeed.isEmpty() && Resources.greaterThan(rc, totGuarant,
>         unassigned, Resources.none())) {
> {code}
>  will loop even when vcores are 0 (because memory is still +ve). Hence we are 
> having more vcores in idealAssigned which cause no-preemption cases.

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