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You want to ensure exactly-once processing in a Kafka consumer application. Which commit strategy is safer and why?

hard📝 Application Q15 of 15
Kafka - Consumers
You want to ensure exactly-once processing in a Kafka consumer application. Which commit strategy is safer and why?
AAuto-commit, because it commits offsets automatically without extra code.
BManual commit, because you commit offsets only after successful processing.
CAuto-commit, because it commits offsets after processing each message.
DManual commit, because it commits offsets before processing messages.
Step-by-Step Solution
Solution:

  1. Step 1: Understand exactly-once processing needs

    Exactly-once means processing each message once and committing offset only after success.

  2. Step 2: Compare commit strategies

    Auto-commit commits offsets automatically at intervals, risking committing before processing completes. Manual commit lets you commit only after successful processing.

  3. Final Answer:

    Manual commit, because you commit offsets only after successful processing. -> Option B

  4. Quick Check:

    Exactly-once needs manual commit after success [OK]
Quick Trick: Commit manually after success for exactly-once processing [OK]
Common Mistakes:
  • Assuming auto-commit guarantees exactly-once
  • Committing offsets before processing
  • Ignoring commit timing importance

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