http://www.caiyiting.com/blog/2014/mongodb-sharding.html
二、MongoDB分布式高可用集群实现
http://www.caiyiting.com/blog/2014/replica-sets-sharding-realization.html
三、MongoDB分配的原理、搭建与应用
http://www.cnblogs.com/zhoujinyi/p/4635444.html?utm_source=tuicool&utm_medium=referral