Pubsub

Redis Pub/Sub and Streams answer different delivery questions. Pub/Sub broadcasts to currently active subscriptions without retaining messages for later replay. A stream stores entries that readers can revisit while they remain retained. Choosing between them starts with who must receive an event and what should happen during a consumer’s absence. ...

Redis Pub/Sub broadcasts to subscriptions that are active when a message is published. It does not retain an inbox for a disconnected listener. This suits replaceable live notifications, but a positive PUBLISH response is not evidence that a worker finished a job or that an offline consumer can recover it. ...