kubernetes raft一致性算法

参考文档

• https://cizixs.com/2017/12/04/raft-consensus-algorithm
• https://mp.weixin.qq.com/s/2fr1gMcOUcwktP1lz_EGcw
• https://www.cnblogs.com/mindwind/p/5231986.html
• https://segmentfault.com/a/1190000016641336
• https://zhuanlan.zhihu.com/p/27415397
• https://github.com/happyer/distributed-computing