[Solved] What does exactly-once stream processing guarantee in Kafka? — Ans: Each message is processed only once, even with failures | Kafka

Kafka - Advanced Stream Processing

What does exactly-once stream processing guarantee in Kafka?

AMessages can be processed multiple times for safety

BMessages are processed at least once, but duplicates may occur

CEach message is processed only once, even with failures

DMessages are processed only if no failures happen

Step-by-Step Solution

Solution:

Step 1: Understand exactly-once semantics meaning
Exactly-once means each message is processed a single time, no duplicates, even if failures happen.
Step 2: Compare options with definition
Only Each message is processed only once, even with failures matches this guarantee. Others allow duplicates or depend on no failures.
Final Answer:
Each message is processed only once, even with failures -> Option C
Quick Check:
Exactly-once = Each message processed once [OK]

Quick Trick: Exactly-once means no duplicates despite failures [OK]

Common Mistakes:

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