THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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- The fallback logic has been discussed previously. Broker with a lower version would just downgrade static membership towards dynamic membership.
Non-goal
We do have some offline discussions on handling leader rejoin case, for example since the broker could also do the subscription monitoring work, we don't actually need to trigger rebalance on leader side blindly based on its rejoin request. However this is a separate topic and we will address it in another KIP.
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