Publish/subscribe messaging is a form of asynchronous

service-to-service communication.

▪ Any message published to a topic is immediately received

by all of the subscribers to the topic.

▪ Enable event-driven architectures, and decouple

applications to increase performance, reliability and scalability.

▪ Applications are decoupled into smaller, independent

building blocks that are easier to develop, deploy and

maintain.

▪ Publish/Subscribe (Pub/Sub) messaging provides instant

event notifications for these distributed applications.

▪ A message topic provides a lightweight mechanism to

broadcast asynchronous event notifications.

▪ All components that subscribe to the topic receive every

message, unless a message filtering policy is set by the

subscriber.

Benefits

● Adding new subscriber services very easily

● Increase flexible scalability

● Distribute received messages at scale

● Event-driven Microservices

Drawbacks

● Single Point of Failure - Message Broker

● Hard to Debugging

● Not Good for FIFO and exact-once requirements

can cause performance and scalability problems 

https://solace.com/blog/publish-subscribe-messaging-pattern/