Which of the following best describes the guarantee provided by Kafka's Exactly-once semantics (EOS)?

easy🧠 Conceptual Q1 of Q15

Kafka - Message Delivery Semantics

AMessages are delivered at least once, allowing duplicates in failure scenarios.

BEach message is processed and committed exactly once, even in the presence of failures.

CMessages are delivered at most once, potentially losing some messages during failures.

DMessages are processed multiple times to ensure no data loss.

Step-by-Step Solution

Solution:

Step 1: Understand EOS definition
Exactly-once semantics means that each message is guaranteed to be processed and committed only once, avoiding duplicates and data loss.
Step 2: Compare options
Each message is processed and committed exactly once, even in the presence of failures. correctly states the guarantee. Options B and C describe at-least-once and at-most-once semantics respectively, which are different from EOS. Messages are processed multiple times to ensure no data loss. is incorrect as it implies multiple processing.
Final Answer:
Each message is processed and committed exactly once, even in the presence of failures. -> Option B
Quick Check:
EOS means exactly one processing per message [OK]

Quick Trick: EOS means no duplicates or message loss [OK]

Common Mistakes:

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