## MapReduce倒排索引
参考https://www.cnblogs.com/zll20153246/p/9334857.html
## MapReduce表连接操作
参考https://blog.csdn.net/chuyouyinghe/article/details/78845364
## CAP理论介绍
参考http://www.ruanyifeng.com/blog/2018/07/cap.html
https://www.zhihu.com/question/54105974