#rabbitmq
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- RabbitMQ: acks, prefetch and redeliveryWhy a queue keeps a message until the consumer acks it, how prefetch decides who gets the next one, and what happens to messages a consumer was holding when it dies.
- RabbitMQ: dead letters, TTL and length limitsWhere a queue sends the messages it gives up on, how message TTL and a dead-letter exchange make a delayed retry, and what a full queue does with one more message.
- RabbitMQ: exchanges, bindings and routingPublishers never write to queues. How the four exchange types decide which queues get a copy, what topic patterns match, and what happens to a message nothing matches.
- RabbitMQ vs KafkaA queue that forgets acked messages versus a log that keeps everything: how the two differ in routing, delivery, ordering, replay and failure, and when each fits.