Jian He commented on YARN-2498:

lgtm, +1

> Respect labels in preemption policy of capacity scheduler for inter-queue 
> preemption
> ------------------------------------------------------------------------------------
>                 Key: YARN-2498
>                 URL: https://issues.apache.org/jira/browse/YARN-2498
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>         Attachments: STALED-YARN-2498.zip, YARN-2498.1.patch, 
> YARN-2498.2.patch, YARN-2498.3.patch, YARN-2498.4.patch
> There're 3 stages in ProportionalCapacityPreemptionPolicy,
> # Recursively calculate {{ideal_assigned}} for queue. This is depends on 
> available resource, resource used/pending in each queue and guaranteed 
> capacity of each queue.
> # Mark to-be preempted containers: For each over-satisfied queue, it will 
> mark some containers will be preempted.
> # Notify scheduler about to-be preempted container.
> We need respect labels in the cluster for both #1 and #2:
> For #1, when calculating ideal_assigned for each queue, we need get 
> by-partition-ideal-assigned according to queue's 
> guaranteed/maximum/used/pending resource on specific partition.
> For #2, when we make decision about whether we need preempt a container, we 
> need make sure, resource this container is *possibly* usable by a queue which 
> is under-satisfied and has pending resource.
> In addition, we need to handle ignore_partition_exclusivity case, when we 
> need to preempt containers from a queue's partition, we will first preempt 
> ignore_partition_exclusivity allocated containers.

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