Hi, I'm attempting a migration from 2.7 to 3.5.0 and the way it's recommended in the documentation.
1. Freeze the following settings inter.broker.protocol.version=2.7-IV2 log.message.format.version=2.7-IV2 2. Upgrade kafka version to 3.5.0 3. Change inter.broker.protocol.version to 3.5 4. Change log.message.format.version to 3.5 After step 2, I get random under-replicated partitions on some topics (all of them are empty). But the way they are under-replicated seems weird to me: ``` Topic: __consumer_offsets Partition: 13 Leader: 10001 Replicas: 10001,10000,10002 Isr: 10002,10000 ``` It turns out the leader is no longer part of the ISRs. I didn't even know this was possible. Does anyone know how this is possible and if this is a known issue? Kind Regards, J
