qiurunze123/miaosha

This is a Java-based educational project focused on designing and building a high-concurrency flash sale system, the kind of backend architecture needed to handle thousands of users simultaneously trying to buy a limited-quantity product in seconds, like during a major online shopping event. The repository is primarily a learning resource for intermediate-to-advanced Java developers preparing for technical interviews at major Chinese tech companies. It covers how to architect systems that stay fast and reliable under extreme load, including handling race conditions (when thousands of requests arrive at the exact same moment), preventing overselling, implementing message queues, Redis caching, and distributed coordination. Alongside the main flash sale project, the author has linked several companion educational repositories: a guide to Java multithreading, JVM memory optimization, a lightweight workflow engine, ZooKeeper distributed system design (ZooKeeper is a tool for coordinating distributed services), and design pattern studies. The README and most content is written in Chinese, making this most accessible to Chinese-speaking developers. For non-Chinese speakers, the code itself is navigable, but the explanatory context is in Mandarin. The project is no longer actively updated but remains a useful reference architecture for understanding how to build systems that handle massive simultaneous demand, a skill set highly valued in backend engineering interviews at companies like Alibaba, Tencent, and ByteDance.