Building event-driven Java applications using Redis Streams by Mark Paluch

Events are all around us. With Redis Streams, we can capture these and store events in Redis. Redis Streams represent a journal-like data structure and allow sequential processing of messages since Redis 5.0.

Let’s take together a look, how we can integrate streams into applications; How to consume and produce messages to build a message-oriented Java application using the Spring Framework and Redis.

[djpentz]

I don't quite follow - the presenter seems to suggest at the end that Redis streams use isn't actually scalable? Or am I misunderstanding his comment?