FastDFS is an open source high performance distributed file system (DFS). It's major functions include: file storing, file syncing and file accessing, and design for high capacity and load balance. Wechat/Weixin public account (Chinese Language): fastdfs
下载时， 为什么不是在请求tracker server 时返回一个可用的storage server. 而是要用nginx module 再判断是否同步完成，并且重定向资源呢？