[Solved] Which of the following is a common technique to implement idempotency in event consumers? — Ans: Storing processed event IDs and skipping duplicates | Microservices

Microservices - Event-Driven Architecture

Which of the following is a common technique to implement idempotency in event consumers?

AProcessing events only if they arrive in a strict sequence

BIgnoring all events that arrive after the first one

CStoring processed event IDs and skipping duplicates

DUsing random delays before processing each event

Step-by-Step Solution

Solution:

Step 1: Identify how to detect duplicate events
Storing event IDs allows the consumer to recognize if an event was already processed.
Step 2: Understand skipping duplicates
When a duplicate event ID is found, the consumer skips processing to avoid side effects.
Final Answer:
Storing processed event IDs and skipping duplicates -> Option C
Quick Check:
Duplicate detection = Store and skip [OK]

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

Common Mistakes:

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Which of the following is a common technique to implement idempotency in event consumers?