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System Design Quiz Practice
Active Recall Drill Session
← Exit Session
Question 1 of 1
medium
System Design
Why does each notification delivery channel need its own idempotency handling?
A
Idempotency only matters for payment systems, not notifications
B
Because at-least-once delivery is the practical default for the underlying queue, and without idempotency, a redelivered message could cause a user to receive the same notification (e.g. the same email) more than once
C
Idempotency handling is automatically provided by pub/sub systems with no extra work
D
It's purely a backend concern with no relevance to system design
Check Answer