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BG2BKK avatar BG2BKK commented on July 17, 2024

你好，ngx_lua的cache有多种，ngx_shared_dict、srcache等等，这个项目里用到了ngx_shared_dict，是ngx_lua的一个模块，基于ngx shm实现，可以实现进程间共享，原子操作，十分高效；ngx_lua的任务同步机制，或者说缓存锁，有两种实现方式，一种是lua-resty-lock，基于ngx_shared_dict实现，进程间共享，该repo的README中提到了经典用法；另一种是新版本ngx_lua中的semaphore，基于luajit的ffi实现，在worker内的级别实现锁机制。

具体到本项目，cache模块缓存的是运行时信息和用户特征对应的分流结果，有缓存失效机制，确保lua代码实时拉取运行时信息；缓存失效时有同步机制，目前采用的是semaphore方式，减轻对后端redis的压力。

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