更改 Kafka Streams 内部主题的复制因子会影响 kafka 流吗？ 流媒体会处于错误状态吗？

Question

I have two Kafka streams applications running on two different nodes. Brokers are 5. Replication factor of topics and changelog topics is 2. Now I want to increase or decrease replication factor for internal topics. Would this affect my running Kafka Streams? Do I have to restart applications for the change to take place or do I have to change application ids for streams? If yes, is there any strong reason for that?

Same is question for changing standy by replicas of stores (eg NUM_STANDBY_REPLICAS_CONFIG)?

Thank you.

Answer 1

Changing replication factor would not affect the topology, because (hopefully) the leader brokers of each partition are not changing while the replication process occurs

Should you chose to lower the replication factor, thus removing leadership while the application is running, then you would see errors like "broker is not assigned partition"