Apache Kafka Practice Exam 2025 – The Complete All-in-One Guide for Exam Success!

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What does 'exactly once' semantics ensure in Kafka?

Messages are delivered at least twice

Messages are processed without duplication or loss

'Exactly once' semantics in Kafka ensures that messages are processed without duplication or loss. This means that when a message is produced and consumed in a Kafka system configured for exactly once semantics, the message will be delivered and processed exactly one time, regardless of any potential failures or restarts in the system. This is particularly important in scenarios where it's critical to maintain integrity, such as financial transactions or counting events, as it prevents both the ingestion of duplicate entries and the loss of important messages.

In contrast, the other options describe different behaviors: one indicates messages can be redundantly delivered, another acknowledges potential message loss during failures, and yet another refers to processing delays, none of which align with the rigorous guarantees provided by exactly once processing.

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Messages can be lost if there's a failure

Messages may be processed with a delay

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