Redis Pub/Sub
ELI5 — The Vibe Check
Redis Pub/Sub is like a PA system in a building. You shout a message on a channel, and everyone listening to that channel hears it instantly. But if nobody's listening? The message vanishes into thin air like it never existed. It's fire-and-forget messaging at its finest.
Real Talk
A lightweight messaging pattern in Redis where publishers send messages to channels and all subscribed clients receive them in real-time. Messages are not persisted — if no subscriber is connected, the message is lost. Best suited for real-time notifications where delivery guarantees aren't critical.
When You'll Hear This
"We use Redis Pub/Sub to broadcast cache invalidation events across all our app servers." / "Redis Pub/Sub is perfect for our chat feature — real-time delivery, no persistence needed."
Related Terms
Redis Cluster
One Redis server is fast. But what if you need MORE fast? Redis Cluster takes your data and spreads it across multiple Redis nodes using hash slots, like d
Redis Streams
Redis looked at Kafka and said 'I can do that too, but simpler and from memory!' Redis Streams is an append-only log data structure built right into Redis.
WebSocket
WebSocket is like upgrading a walkie-talkie from push-to-talk to a full phone call.