Flash-Sale-System-backend

• Designed the “Flash Sale System” project.

• Improving performance from 500 QPS to 10,000 QPS by employing Redis and RocketMQ.

• Functions: commodity; promotion -> order -> pay;

• Adopted DDD(Domain Driving Design): api - application - domain - infrastructure

  • Split order service into promotion and order microservices according to DDD(Domain Driving Design) principles.

• high-concurrency:

  • Implemented cache preheating for active promotions. Completed lock and revert inventory service through Redis and Lua script.
  • Peak-load shifting order service stress by asynchronously create order using RocketMQ. Implemented "Pay-Check&Cancel" by consuming delay message. And optimized optimistic-lock of updating inventory in MySQL database.

• test: Postman; Jmeter

• workflow: JIRA (canary mode)

Version1

1. MySQL lock、Pessimistic Locking、 Optimistic Locking，to prevent oversell
2. Database Event - Transaction， SpringBoot event management
3. PostMan: API-testing tool
4. Jmeter: concurrency testing tool

Version2

1. Redis + Lua script to achieve event, Redis cache preheat

2. RocketMQ

   Idempotency, delay message, etc.

3. Junit5， Mockito: unit test

Version3 (WIP)

1. Distrubuted Transaction
2. Redis: distributed lock
3. SnoFlake to generate OrderId
4. Microservice find and register center: Consul，Feign declare， SpringCloud-Gateway

Tech Stack

Languages:

Java; SQL; JavaScript, HTML, CSS, Ajax, Axios;

Framework & Database:

Spring Boot, Spring Cloud, Restful API; Mircroservice, Consul, Sentinel(, Hystrix) ; JOOQ, (JPA, Hibernate, Mybatis); MySQL, Redis, Lua, RocketMQ, Eventual Consistency, Idempotent Message;

Tools & Others:

JIRA, Confluence, Bitbucket, Git/Github; Junit5, Mockito, Jmeter; Maven, Postman, MysqlWorkbench, RedisInsight, RocketMQ Dashboard; OOD, OOP, SOLID, Design Patterns, DDD; Agile, XML, JSON.