元数据缓存器将目录和文件的路径名称保存为键，将元数据保存为值（如文件长度、最后修改时间、标记该条目是文件还是目录等）。
The metadata cache contains the full path names of directories and files as keys and metadata (e.g. file length, last modification date, and whether the key is a file or a directory) as values.
memcached服务器只是网络上针对一些键存储值的一个缓存。
The memcached server is just a cache storing values against keys over a network.
由于处理器与请求者和参数无关，缓存散列键就可以仅由HTTP的action参数值组成。
Because the processor is independent of the requestor and the parameters, the hash key for caching simply can be composed of the value of the action HTTP parameter.
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