Why is it important to design compensating transactions in a Saga pattern to be idempotent when using Kafka?

hard📝 Conceptual Q10 of 15

Kafka - Event-Driven Architecture

ABecause Kafka guarantees exactly-once delivery, idempotency is optional.

BBecause idempotency improves Kafka topic retention time.

CBecause idempotency allows skipping compensation steps safely.

DBecause Kafka may deliver messages more than once, idempotency prevents duplicate side effects.

Step-by-Step Solution

Solution:

Step 1: Kafka delivery semantics
Kafka can deliver messages multiple times due to retries or failures.
Step 2: Importance of idempotent compensations
Idempotent compensations ensure repeated events do not cause repeated side effects, preserving correctness.
Final Answer:
Because Kafka may deliver messages more than once, idempotency prevents duplicate side effects. -> Option D
Quick Check:
Idempotent compensations = handle duplicate Kafka messages safely [OK]

Quick Trick: Make compensations idempotent to handle retries safely [OK]

Common Mistakes:

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