A developer notices that the e-commerce order service sometimes processes duplicate orders when users click 'Buy' multiple times quickly. What is the best fix?

medium📝 Analysis Q6 of 15

LLD - Design — Online Shopping Cart

AAllow duplicates and fix them manually later

BImplement idempotency keys to prevent duplicate order processing

CRemove all input validation to speed up processing

DDisable the 'Buy' button permanently

Step-by-Step Solution

Solution:

Step 1: Understand duplicate order causes
Multiple clicks can cause repeated requests leading to duplicate orders.
Step 2: Use idempotency keys
Idempotency keys ensure repeated requests with the same key are processed only once, preventing duplicates.
Final Answer:
Implement idempotency keys to prevent duplicate order processing -> Option B
Quick Check:
Idempotency keys = no duplicate orders [OK]

Quick Trick: Use idempotency keys to avoid duplicates [OK]

Common Mistakes:

Ignoring duplicate requests
Removing validation
Disabling UI elements permanently

Master "Design — Online Shopping Cart" in LLD

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Arch Try Challenge Design Recall Scale

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions

More LLD Quizzes

A developer notices that the e-commerce order service sometimes processes duplicate orders when users click 'Buy' multiple times quickly. What is the best fix?

Step 1: Understand duplicate order causes

Step 2: Use idempotency keys

Final Answer:

Quick Check:

Want More Practice?