Thank you for another review Ziming, much appreciated! 1. and 2. You are correct, it would be a big and perhaps strange difference. Since our last exchange of emails, the proposal has changed and now it does follow your suggestion to bump metadata.version. The KIP mentions it under "Compatibility, Deprecation, and Migration Plan".
3. I tried to describe this under "Controller", under the heading "Handling replica assignments", but perhaps it could be improved. Let me know what you think. Best, -- Igor
