What are the differences between a pub-sub system and a message queue?

What are the differences between a pub-sub system and a message queue?

A pub-sub system allows multiple subscribers to receive messages from a publisher, while a message queue typically involves a point-to-point communication model where messages are sent to a queue and processed by a single consumer.

Can you give me an example of when to use each?

Sure! Use a pub-sub system for real-time notifications, like social media updates. Use a message queue for tasks that need to be processed in order, like order processing in e-commerce.

What are the advantages of using a pub-sub system?

Advantages include scalability, decoupling of components, and the ability to broadcast messages to multiple subscribers simultaneously.

Are there any downsides to using a message queue?

Yes, potential downsides include increased complexity, the need for message acknowledgment, and possible bottlenecks if a single consumer is overwhelmed.