[Solved] Why is it important to guarantee exactly-once processing semantics during event replay? — Ans: To avoid duplicate state changes and ensure data consistency | Microservices

Microservices - Event-Driven Architecture

Why is it important to guarantee exactly-once processing semantics during event replay?

ATo avoid duplicate state changes and ensure data consistency

BTo speed up event processing by skipping some events

CTo allow multiple services to replay events simultaneously without coordination

DTo reduce storage space by deleting events after replay

Step-by-Step Solution

Solution:

Step 1: Define exactly-once processing
Exactly-once means each event affects state only once, preventing duplicates.
Step 2: Explain importance
Duplicate processing causes inconsistent state. Speeding up by skipping events or allowing uncoordinated replay risks errors. Deleting events after replay loses history.
Final Answer:
To avoid duplicate state changes and ensure data consistency -> Option A
Quick Check:
Exactly-once = consistent state [OK]

Quick Trick: Exactly-once prevents duplicates, ensuring consistency [OK]

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