Apache Kafka

Kafka vs Redis pub/sub: when to use each for messaging?

The question is about Apache Kafka .

Answer:
Kafka is the better choice when message durability, consumer replay, high throughput, and long-term event storage are required - Kafka retains all messages regardless of consumer activity. Redis pub/sub is the better choice for low-latency, ephemeral message broadcasting where messages do not need to be stored or replayed - real-time notifications and cache invalidation signals. Redis pub/sub loses messages if no consumer is connected; Kafka never loses committed messages.

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