chia7712 commented on PR #17576:
URL: https://github.com/apache/kafka/pull/17576#issuecomment-2451281344

   > Please remember that the first production KRaft version with 3.3, and we 
do not support upgrades from versions earlier than that. (We will test older 
clients, of course, but clients don't use ZK.)
   
   Do you mean that we don't need to test the new client (4.0) producing and 
consuming from older brokers (2.1 to 2.3)?


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