At Least Once Guarantees?

At least once guarantee means you will definitely receive and process every message, but you may process some messages additional times in the face of a failure. Here's a few examples of some failure scenarios that can lead to at-least-once semantics: 1.

Does Kafka guarantee at least once?

Now, Kafka provides “at-least-once” delivery guarantees, as each record will likely be delivered one time but in a failure case, data could be duplicated.

What is exactly once guarantee?

There are two possible behaviors of Exactly-Once Processing in Kafka. Idempotent Guarantee: This restricts Exactly-Once Processing on a single Topic-Partition and within a single producer session. Exactly-Once Processing is not guaranteed when the producer is restarted.