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https://issues.apache.org/jira/browse/YARN-6443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15960755#comment-15960755
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Jason Lowe commented on YARN-6443:
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Ah, so this apparently is describing a problem that only can occur if scheduler
keys are being used? I'm not sure we need a flag here. Seems like we simply
should not guarantee that allocations are returned within a priority group in
the order they are requested -- they can be returned in any order. It
certainly worked that way without scheduler keys. If you need ordering, that's
what priorities are for. In that sense I see this not as an enhancement but
rather a bugfix. Or am I misunderstanding the problem?
> Allow for Priority order relaxing in favor of improved node/rack locality
> --------------------------------------------------------------------------
>
> Key: YARN-6443
> URL: https://issues.apache.org/jira/browse/YARN-6443
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: capacity scheduler, fairscheduler
> Reporter: Arun Suresh
> Assignee: Hitesh Sharma
>
> Currently the Schedulers examine an applications pending Requests in Priority
> order. This JIRA proposes to introduce a flag (either via the
> ApplicationMasterService::registerApplication() or via some Scheduler
> configuration) to favor an ordering that is baised to the node that is
> currently heartbeating by relaxing the priority constraint.
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