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At Least Once as a Paradigm
At least once as a paradigm is you're basically saying that in the event of failures, so any sort of networking problem, you will err on the side of delivering a message multiple times rather than zero times. Kafka and most Q systems that call themselves streaming works slightly differently to at least once. A lot of them will behave in a way where under certain circumstances, they will lose data. It doesn't mean there's not circumstances where you might drop data under certain circumstances.