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What guarantee does setting enable.idempotence=true provide when producing messages to Kafka?

easy🧠 Conceptual Q1 of Q15
Kafka - Message Delivery Semantics

What guarantee does setting enable.idempotence=true provide when producing messages to Kafka?

AIt ensures messages are delivered exactly once without duplicates.
BIt compresses messages to reduce network usage.
CIt disables retries on message send failures.
DIt allows messages to be sent without acknowledgments.
Step-by-Step Solution
Solution:

  1. Step 1: Understand idempotence

    Idempotence in Kafka producer means that even if a message is sent multiple times due to retries, it will be written only once to the topic.

  2. Step 2: Effect of enable.idempotence=true

    Enabling this setting ensures the producer assigns sequence numbers to messages and the broker deduplicates them.

  3. Final Answer:

    It ensures messages are delivered exactly once without duplicates. -> Option A

  4. Quick Check:

    Idempotence prevents duplicate messages [OK]
Quick Trick: Idempotence avoids duplicates, ensuring exactly-once delivery [OK]
Common Mistakes:
MISTAKES
  • Confusing idempotence with compression
  • Thinking it disables retries
  • Assuming it removes acknowledgments

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