Hello all, We run into a scenario where we had misconfigured the replication factor and the minimum in-sync replicas count in such a way that the replication factor (either default or defined at the topic level) is strictly lower than the property min.insync.replicas.
We observed broker metrics reporting UnderReplicatedPartitions = 0 and UnderMinPartitionIsrCount > 0, and the topic’s partitions were unavailable for producers (with ack=all) and consumers. Since it seems to be impossible in this scenario to ever reach the number of in-sync replicas, making partitions permanently unavailable, it could be worth to prevent this misconfiguration to make its way to the broker, e.g. a check could be added when a topic is created to ensure the replication factor is greater than or equals to the minimum number of in-sync replicas. I may have missed something though. What do you think? Thank you, Alexandre
