Same configuration in Kafka Producer, Broker and Topic

Question

I see few configurations which are a part of configuration list of brokers, producers as well as topics like: compression.type

How does all 3 configs work together? Like, if we I have compression.type in producer config as None, and compression.type in broker config as gzip. How does it work?

There are similarly other configs too, like min.insync.replicas. My understanding is, it should be a Topic configuration (which it is), but it is also a broker configuration. Is it something like - a broker has say min.insync.isr as 4, so all the topics created on that broker will have min.insync.isr as 4?

Answer 1

The broker configs are defaults. Everything else is an explicit override.