[Solved] What does the at-least-once delivery guarantee in Kafka ensure? - Ans: Messages are never lost but may be delivered more than once. | Kafka

Kafka - Message Delivery Semantics

What does the at-least-once delivery guarantee in Kafka ensure?

AMessages might be lost but never duplicated.

BMessages are delivered exactly once with no duplicates.

CMessages are never lost but may be delivered more than once.

DMessages are delivered only once, but some may be lost.

Step-by-Step Solution

Solution:

Step 1: Understand at-least-once guarantee meaning
At-least-once means Kafka tries to deliver messages one or more times, so no message is lost but duplicates can occur.
Step 2: Compare options with guarantee definition
Messages are never lost but may be delivered more than once. matches this exactly: no loss but possible duplicates. Others describe different guarantees.
Final Answer:
Messages are never lost but may be delivered more than once. -> Option C
Quick Check:
At-least-once = No loss, possible duplicates [OK]

Quick Trick: At-least-once means no loss, duplicates allowed [OK]

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