一致性hash介绍
一致性hash一种根据关键字做负载均衡的算法 代码
节点丢失，或者加入的时候，影响的是一小段空间而不是全局数据
一致性hash很难做到完全的负载均衡，都有数据小幅度倾斜
假设有一种算法,可以把节点关键字尽可能的打散均匀的映射到hash空间中,这时候可以完全解决数据倾斜的问题
系统启动的时候负载是做到了均衡，但是当节点丢失，或者新增加节点的时候,一致性hash肯定会再次出现数据倾斜的问题
加虚拟节点(只能降低不能完全解决问题----可以使用上面类似反证法证明）
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