Hi, We are upgrading our Cassandra clusters from 3.0.27 to 4.0.6 and we observed some error related to repair: j.l.IllegalArgumentException: Unknown verb id 32
We have two datacenters for each Cassandra cluster and when we are doing an upgrade, we want to upgrade 1 datacenter first and monitor the upgrade datacenter for some time (1 week) to make sure there is no issue, then we will upgrade the second datacenter for that cluster. We have some automated repair jobs running, is it expected to have repair stuck if we have 1 datacenter on 4.0 and 1 datacenter on 3.0? Do you have any suggestions on how we should do the upgrade, is waiting for 1 week between two datacenters too long? Thanks, Runtian
