CoachUnder at-most-once delivery a message may be lost but is never processed twice: the consumer commits the offset before processing. Under at-least-once delivery a message is never lost but may be processed more than once: the consumer commits after processing, and a crash in between repeats the uncommitted messages.
Quantitative Finance · Glossary
What is At-most-once and at-least-once delivery?
Also known as: at-most-once delivery · at-least-once delivery