Intro
The Opener Market project is finally coming to an end. In this final post, I will review the overall system architecture and share the key lessons learned from building a high-concurrency e-commerce platform.
1. The Big Picture: System Architecture
Our system is divided into three main domains, each solving a specific high-traffic problem:
- Coupon Domain: Uses Redis Lua Scripts for atomic stock control and a Write-Back pattern to ensure data consistency without slowing down the user.
- Order Domain: Implements Database Locking (Pessimistic/Optimistic) to prevent over-selling and ensure transaction integrity.
- Search Domain: Powered by QueryDSL for type-safe dynamic queries and optimized with composite indexes for sub-second latency.
2. Performance Milestones
- Search Latency: Reduced from 1.8s to 0.5s (72% improvement).
- Throughput: Successfully handled high-concurrency coupon issuance using Redis memory instead of DB locks.
- Consistency: Guaranteed atomic transactions across Balance, Stock, and Points.
3. Key Lessons
- Memory-First Strategy: For high-traffic events, the Database should be the last resort. Redis is essential for protecting the core system.
- Asynchronous Processing: Decoupling the user response from heavy tasks (like DB persistence) is the secret to a smooth UX.
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Data Integrity vs. Speed: In e-commerce, speed is important, but accuracy is everything. Always use
@Transactionaland proper locking strategies.
Final Thoughts
Building Opener Market was a deep dive into the world of scalable backend systems. This project taught me how to balance complex requirements with performance optimization.
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