LLD - Design — Food Delivery System
You need to design a scalable rating and review system that supports millions of products and users. Which approach best handles high read traffic for average ratings?
You need to design a scalable rating and review system that supports millions of products and users. Which approach best handles high read traffic for average ratings?
hard📝 Trade-off Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand read traffic challenge
Millions of users reading ratings cause heavy load if computed live.Step 2: Choose caching strategy
Precomputing averages and caching them reduces database hits and speeds reads.Final Answer:
Precompute and cache average ratings in a fast key-value store -> Option DQuick Check:
High read scalability = Use caching [OK]
Quick Trick: Cache computed averages to reduce database load [OK]
Common Mistakes:
- Calculating averages live for every request
- Using flat files which are slow for queries
- Disabling caching increases latency
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