Arun Suresh created YARN-5255:
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Summary: 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: Bug
Reporter: Arun Suresh
YARN-4879 proposes to enhance the Allocate Request by introducing a way to
explicitly identify a ResourceRequest explicitly
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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