xkrogen commented on pull request #3976:
URL: https://github.com/apache/hadoop/pull/3976#issuecomment-1050121895


   I agree with you that the current logic has RPCs that are theoretically 
unnecessary. I would be very open to some approach that allows 
`ObservedReadProxyProvider` to share information with its `failoverProxy` 
instance (either direction, from ORRP to `failoverProxy` or from 
`failoverProxy` to ORPP, could be useful) to eliminate unnecessary work. But we 
need to make sure it is layered cleanly, so that `failoverProxy` and ORPP both 
continue to respect their duties: `failoverProxy` is responsible for 
finding/contacting the Active NN (including for `msync`), and ORPP is 
responsible for finding/contacting Observer NNs.


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