ExactlyonceSemantik
ExactlyonceSemantik is a concept in distributed systems describing guarantees that a given operation or message is processed exactly once. In practice this means the system avoids duplicates and ensures side effects occur only once. It is contrasted with at-least-once (possible duplicates) and at-most-once (possible losses).
Achieving EOS relies on coordination, reliable storage, and idempotent design. Techniques include idempotent operations, use of
However, guaranteeing EOS across external effects is difficult; outside interactions or long-running processes may require compensating
Common patterns include outbox tables, the Saga pattern, two-phase commit where applicable, and ensuring idempotency across
Exactly-once semantics are critical in financial transactions, inventory updates, and order processing. The term is widely