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https://issues.apache.org/jira/browse/YARN-5255?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Subru Krishnan updated YARN-5255:
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Issue Type: Improvement (was: Sub-task)
Parent: (was: YARN-4879)
> Move ResourceRequest expansion for Delay Scheduling to the Scheduler
> --------------------------------------------------------------------
>
> Key: YARN-5255
> URL: https://issues.apache.org/jira/browse/YARN-5255
> Project: Hadoop YARN
> Issue Type: Improvement
> Reporter: Arun Suresh
> Assignee: Arun Suresh
>
> YARN-4879 proposes to enhance the Allocate Request by introducing an id to
> explicitly identify a ResourceRequest.
> Currently, if relaxLocality == true, a Node specific request is expanded to
> rack and *ANY* request by the {{AMRMClient}} before being sent to the
> Scheduler. The requires the 3 copies to perform locality specific delay
> scheduling.
> It would be better to perform the expansion in the Scheduler itself, rather
> than the client, since:
> # The expansion is not really specified in the ApplicationMasterProtocol, a
> non-java client will have to duplicate the expansion logic.
> # Refactor out a lot of unnecessary code in the {{AMRMClientImpl}}
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