LLD - Design — Library Management System
How would you design a scalable hold system to handle millions of concurrent users holding items with expiration?
How would you design a scalable hold system to handle millions of concurrent users holding items with expiration?
hard📝 Trade-off Q8 of Q15
Step-by-Step Solution
Solution:
Step 1: Identify scalability needs
Millions of users require fast, distributed, and efficient hold tracking.Step 2: Choose appropriate technology
Distributed cache with TTL (time-to-live) automatically expires holds; background cleanup ensures consistency.Final Answer:
Use distributed cache with TTL and a background cleanup service -> Option DQuick Check:
Scalable hold system = distributed cache + TTL [OK]
Quick Trick: Distributed cache with TTL handles large scale holds efficiently [OK]
Common Mistakes:
MISTAKES- Using single DB table causing bottlenecks
- Relying on client-side timers which are unreliable
- Checking holds on every request causing overhead
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