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https://issues.apache.org/jira/browse/YARN-6808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16085184#comment-16085184
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Arun Suresh commented on YARN-6808:
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[~haibochen], the plan to use it to provide stricter capacity guarantees to
queue, essentially push preemption to the NM. I guess YARN-1015 / YARN-1013 can
be viewed as something complementary. My understanding is that in the later
case, the scheduler would allocate OPP containers to a specific node based on
unused allocated resources. While, with this patch, OPP containers will be
allocated if an app requests resources beyond its available headroom.
> Allow Schedulers to return OPPORTUNISTIC containers when queues go over
> configured capacity
> -------------------------------------------------------------------------------------------
>
> Key: YARN-6808
> URL: https://issues.apache.org/jira/browse/YARN-6808
> Project: Hadoop YARN
> Issue Type: New Feature
> Reporter: Arun Suresh
> Assignee: Arun Suresh
> Attachments: YARN-6808.001.patch
>
>
> This is based on discussions with [~kasha] and [~kkaranasos].
> Currently, when a Queues goes over capacity, apps on starved queues must wait
> either for containers to complete or for them to be pre-empted by the
> scheduler to get resources.
> This JIRA proposes to allow Schedulers to:
> # Allocate all containers over the configured queue capacity/weight as
> OPPORTUNISTIC.
> # Auto-promote running OPPORTUNISTIC containers of apps as and when their
> GUARANTEED containers complete.
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