Z_572(Zheng Junjie) suggests not to inherit from redis, to ease the
deletion of redis package. 
-- 
Retrieve my PGP public key:
执行下列命令以获取我的 PGP 公有密钥：

  gpg --recv-keys B3EBC086AB0EBC0F45E0B4D433DB374BCEE4D9DC

Zihao