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https://issues.apache.org/jira/browse/YARN-5906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15805164#comment-15805164
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Wangda Tan commented on YARN-5906:
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Thanks for backporting this! [~sunilg]!
> Update AppSchedulingInfo to use SchedulingPlacementSet
> ------------------------------------------------------
>
> Key: YARN-5906
> URL: https://issues.apache.org/jira/browse/YARN-5906
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Wangda Tan
> Assignee: Wangda Tan
> Fix For: 2.9.0, 3.0.0-alpha2
>
> Attachments: YARN-5906.1.patch, YARN-5906.2.patch, YARN-5906.3.patch,
> YARN-5906.4.patch, YARN-5906.5.patch, YARN-5906.branch-2.005.patch
>
>
> Currently AppSchedulingInfo simply stores resource request and scheduler make
> decision according to stored resource request. For example, CS/FS use
> slightly different approach to get pending resource request and make delay
> scheduling decision.
> There're several benefits of moving pending resource request data structure
> to SchedulingPlacementSet
> 1) Delay scheduling logic should be agnostic to scheduler, for example CS
> supports count-based delay and FS supports both of count-based and time-based
> delay. Ideally scheduler should be able to choose which delay scheduling
> policy to use.
> 2) In addition to 1., YARN-4902 has proposal to support pluggable delay
> scheduling behavior in addition to locality-based (host->rack->offswitch).
> Which requires more flexibility.
> 3) To make YARN-4902 becomes real, instead of directly adding the new
> resource request API to client, we can make scheduler to use it internally to
> make sure it is well defined. And AppSchedulingInfo/SchedulingPlacementSet
> will be the perfect place to isolate which ResourceRequest implementation to
> use.
> 4) Different scheduling requirement needs different behavior of checking
> ResourceRequest table.
> This JIRA is the 1st patch of several refactorings. Which moves all
> ResourceRequest data structure and logics to SchedulingPlacementSet. We need
> follow changes to make it better structured
> - Make delay scheduling to be a plugin of SchedulingPlacementSet
> - After YARN-4902 get committed, change SchedulingPlacementSet to use
> YARN-4902 internally.
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