Explain 'Exactly-Once Semantics' (EOS).

Explain 'Exactly-Once Semantics' (EOS).

Approach: Describe a guarantee against duplicates and loss.

A delivery guarantee in stream processing where each message is processed exactly once, ensuring no data loss and no duplicate processing even in the event of failures.

Follow-up: How does Kafka achieve this?

Key concepts: transactions, idempotency, consistency.