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https://issues.apache.org/jira/browse/YARN-5392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15386676#comment-15386676
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Arun Suresh commented on YARN-5392:
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[~leftnoteasy], I understand we've touched a lot of the code, but our thinking
was that:
# replacing Priority with SchedulerKey means we actually do NOT have to change
core logic. As you can see, It is almost always a strict replacement of
Priority with SchedulerKey.
# also, like I mentioned earlier, having something like SchedulerKey means we
won't have to change any more code later, if say we decide we need some other
parameter to prioritize scheduling decisions. We can even choose to ignore
current attributes like priority for a deployment if we want, based on
configuration (if we make the SchedulerKey truly pluggable.. but that can be
another JIRA)
> Replace use of Priority in the Scheduling infrastructure with an opaque
> ShedulerKey
> -----------------------------------------------------------------------------------
>
> Key: YARN-5392
> URL: https://issues.apache.org/jira/browse/YARN-5392
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Arun Suresh
> Assignee: Arun Suresh
> Attachments: YARN-5392.001.patch, YARN-5392.002.patch,
> YARN-5392.003.patch, YARN-5392.004.patch
>
>
> Based on discussions in YARN-4888, this jira proposes to replace the use of
> {{Priority}} in the Scheduler infrastructure (Scheduler, Queues, SchedulerApp
> / Node etc.) with a more opaque and extensible {{SchedulerKey}}.
> Note: Even though {{SchedulerKey}} will be used by the internal scheduling
> infrastructure, It will not be exposed to the Client or the AM. The
> SchdulerKey is meant to be an internal construct that is derived from
> attributes of the ResourceRequest / ApplicationSubmissionContext / Scheduler
> Configuration etc.
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