https://josedavidbaena.com Personal website and blog where I document thoughts, ideas, and interests in software engineering, web performance, and open source technologies. en-us josedab@gmail.com (José David Baena) josedab@gmail.com (José David Baena) Sun, 26 Jul 2026 00:00:00 GMT https://josedavidbaena.com/blog/kafka-protocol-internals/04-producer-idempotence-transactions https://josedavidbaena.com/blog/kafka-protocol-internals/04-producer-idempotence-transactions How producer IDs, epochs, sequences, fencing, and transaction markers make Kafka retries safe—and where exactly-once semantics stop. Sun, 26 Jul 2026 00:00:00 GMT josedab@gmail.com (José David Baena) kafkadistributed-systemsprotocolidempotencetransactions