dajac commented on PR #12674:
URL: https://github.com/apache/kafka/pull/12674#issuecomment-1259370231

   @hachikuji Yeah, that's right. If a client already specifies the rack id 
before the cluster sets up a replica selector, the client won't be able to 
fetch until all the brokers have the selector. An alternative to the current 
proposal would be to check wether the rack id is present or not. We could for 
instance disallow fetching from a follower if the rack id is null and the 
leader epoch is -1. That would limit the fix to the set of clients that 
implemented FFF without KIP-320. Do you think that would be better?


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