brandboat commented on PR #18193:
URL: https://github.com/apache/kafka/pull/18193#issuecomment-2562793563

   > @chia7712 Kafka Streams is different - it has to handle its own state 
during upgrades (kind of like the broker). The same is not true for regular 
clients. Maintaining tests like this one is pretty painful. Things will 
eventually break in odd ways (since the 0.11 code is so old). Also, it's too 
risky to go from 0.11 to 4.x+ in one go given multiple cycles of deprecations, 
removals, etc. (including non intersecting supported Java versions).
   
   Sorry to interrupt the discussion and thanks for the insightful comment, I 
100% agree we don't encourage user to do major bumps like 0.11 to 4.x. 
   I have a dumb question here. If we can't guarantee Kafka Consumer can 
successfully upgrade from 0.11 to 4.x, how can Kafka Streams guarantee that? 
Especially this kind of upgrade is still valid until Kafka Streams 5.0.0 comes 
out?


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