Glossary term
What is EOS (Exactly-Once Semantics)?
EOS stands for Exactly-Once Semantics.
Kafka's feature for exactly-once processing within Kafka. Example: Read → process → write back to Kafka atomically.
Learn it properly · System DesignLesson 37: At-Most-Once, At-Least-Once, Exactly-OnceAcknowledge too early and a crash loses the payment; acknowledge too late and it charges twice. At-most-once, at-least-once and why true exactly-once is impossible — plus idempotent consumers, Kafka's exactly-once and the transactional outbox.