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https://issues.apache.org/jira/browse/YARN-5013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15263106#comment-15263106
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Nathan Roberts commented on YARN-5013:
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Re-posting latest comment from [~Naganarasimha]
Thanks for the clarification Tan, Wangda & Nathan Roberts, yes point 2
addresses the same issue and my mistake i missed to read this. And also agree
to the focus of this jira to be specific to the system level OFF-SWITCH
configuration.
bq. so I think when we do the application-level support the default would
need to be either unlimited or some high value, otherwise we force all
applications to set this limit to something other than 1 to get decent
OFF_SWITCH scheduling behavior.
Once we have system level OFF-SWITCH configuration do we require app level
default also ? IIUC by default we try to make use of system level OFF-SWITCH
configuration unless explicitly overridden by the app (implementation can be
further discussed in that jira)
bq. Sure, my application scheduled very quickly but my locality was terrible
so I caused a lot of unnecessary cross-switch traffic. So I think we'll need
some system-minimums that will prevent this type of abuse.
This point is debatable, even though i agree your point for controlling
cross-switch traffic, but still the app is performing under its capacity limits
so would it be good to limit it control it.
bq. If application A meets its OFF-SWITCH-per-node limit, do we offer the
node to other applications in the same queue?
any limitations if we offer the node to other applications in the same queue ?
it should be fine right ?
> Allow applications to provide input on amount of locality delay to use
> ----------------------------------------------------------------------
>
> Key: YARN-5013
> URL: https://issues.apache.org/jira/browse/YARN-5013
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: capacity scheduler
> Affects Versions: 3.0.0
> Reporter: Nathan Roberts
>
> Continuing a discussion that started on YARN-4963
> It would be useful if applications could provide some input to the scheduler
> as to how much locality delay they'd like and/or whether they'd prefer the
> application to be spread wide across the cluster (as opposed to being
> scheduled quickly and densely).
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