Need clarity on a statement in the Upgrade path

Hello, In the upgrade docs, it is mentioned "Restart the brokers one by one for the new protocol version to take effect. *Once the brokers begin using the latest protocol version, it will no longer be possible to downgrade the cluster to an older version.*" What does this mean? Is this statement a

Is there an option to ignore the apiVersion between Kafka versions

Hello, We are trying to upgrade between 2 versions of kafka where the apiVersions of multiple apis have changed. During upgrade we notice a number of UnsupportedVersionExceptions which we want to ignore (during upgrade). Few questions: 1. Is it ok to ignore mismatch of apiVersions? 2. Is the

Brokers not re-joining the ISR list and stuck at started until all the brokers restart

Hi, We are upgrading a 3 broker cluster (1001,1002,1003) from 3.1.0 to 3.2.0. During upgrade, it is noticed that when 1003 is restarted, it doesn't join back the ISR list and the broker is stuck. Same is the case with 1002. Only when 1001 is restarted, 1003,1002 re-join the ISR list and start repli