When to use publisher queue size vs. subscriber queue size
Although most tutorials only discuss the publisher queue size, a subscriber has such a parameter as well. So I'm wondering: When to use which queue size?
Actually the subscriber seems to be the natural place for a queue: If new messages arrive and the handler hasn't finished processing the previous message, it decides whether to store or to discard the message.
But what is the purpose of a publisher queue? If I'm understanding the documentation correctly, it manages whether to publish or to discard a message if any subscriber is still busy.