[Solved] Which of the following is a correct way to implement idempotency in an event consumer? — Ans: Store processed event IDs and skip duplicates | Microservices

Microservices - Event-Driven Architecture

Which of the following is a correct way to implement idempotency in an event consumer?

AProcess events without checking any IDs

BStore processed event IDs and skip duplicates

CIgnore event payload and always acknowledge

DProcess events only if they arrive in order

Step-by-Step Solution

Solution:

Step 1: Identify idempotency implementation
Idempotency requires tracking which events were already processed.
Step 2: Choose correct method
Storing processed event IDs and skipping duplicates ensures no repeated processing.
Final Answer:
Store processed event IDs and skip duplicates -> Option B
Quick Check:
Track event IDs = idempotency [OK]

Quick Trick: Track event IDs to skip duplicates [OK]

Common Mistakes:

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Which of the following is a correct way to implement idempotency in an event consumer?