Increase default.replication.factor to topics in-place?

[jslusher]

I have a Strimzi (version 0.16.2) cluster and I'm running some debezium connectors in it. Originally I had set default.replication.factor to 2 on the Kafka CRD and I created a handful of connectors using the kafka-connect API (not using Strimzi objects). I then went back and set default.replication.factor to 3 on the Kafka CRD. I see that the setting is in place if I look at the nodes themselves. I expected that would increase the number of replicas for the connector topics to 3 but I still only see there are 2 replicas. Am I misunderstanding how a connector interacts with its topics or should that have increased the replicas on the connector's topics?

[scholzj]

I think this setting applies only to newly created topics using the auto-creation. It does not impact already existing topics. For existing topics, you would need to use the kafka-reassign-partitions.sh tool.

[jslusher]

Ah I see. That makes sense. I'll look into that option. Thanks!