exactly-once processing

RU: exactly-once обработка

An application-level guarantee that each input message causes exactly one state change or side-effect, achieved without requiring impossible exactly-once delivery at the transport layer. Implementations combine at-least-once delivery with idempotent operations or deduplication keys to suppress the effects of duplicates. In Kafka, the transactions API (KIP-98) enables exactly-once processing by atomically committing output records and consumer offsets.