Hacker News Reader

Message queues (or similar things like Kafka, which isn't quite a proper "message queue") are used for basically everything at this scale. Messages are being passed indirectly. An event happens, it gets popped on a queue, and then the recipients do something with it.

View on HN

Maybe you'll consider this pedantic, or maybe even wrong, but I think you meant to say "asynchronous" as opposed to "indirectly". I think anyone googling to learn more will get better results.

True, but there is also the store-and-forward subscription model where the message is placed on the queue without an intended recipient. Message passing can also be asynchronous but direct, e.g., Mach messages.

Reply on news.ycombinator.com