LLD - Design — Online Shopping Cart
In designing an e-commerce system to handle flash sales with thousands of users buying limited stock simultaneously, which approach best ensures system reliability and fairness?
In designing an e-commerce system to handle flash sales with thousands of users buying limited stock simultaneously, which approach best ensures system reliability and fairness?
hard📝 Trade-off Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Identify challenges in flash sales
Flash sales cause high concurrency and limited stock, needing careful inventory control.Step 2: Evaluate approaches for reliability and fairness
Distributed locking and reserving inventory before payment prevents overselling and ensures fairness.Step 3: Reject unsafe or inefficient options
Allowing unlimited purchases or disabling authentication causes errors and security risks; poor database design hurts performance.Final Answer:
Implement distributed locking and inventory reservation before payment -> Option AQuick Check:
Concurrency + limited stock = locking + reservation [OK]
Quick Trick: Lock inventory before payment to avoid overselling [OK]
Common Mistakes:
- Ignoring concurrency control
- Disabling security features
- Using inefficient database design
Master "Design — Online Shopping Cart" in LLD
Want More Practice?
15+ quiz questions · All difficulty levels · Free
Free Signup - Practice All QuestionsMore LLD Quizzes