How does micronaut-kafka handle the error when the connection to the broker is lost?

I have multiple Kafka brokers. How micronaut-kafka deal with the error when one broker goes down? Does it automatically switch to another broker?

Solution

That's not handled by Micronaut but by Apache Kafka client.

Depending on the cluster configuration (unclean election) the partition leader might move to a different broker, and producers/consumers pointing there would reconnect after discovering that the old leader is unavailable.

TDLR: Apache Kafka is designed to be highly available service, the frontend (client) impact should be minimal.