参考:
yum方式扩容:
https://www.cnblogs.com/yinzhengjie/articles/11104776.html
二进制包方式扩容:
https://www.cnblogs.com/yinzhengjie/articles/11102924.html
CDH5.12扩容
https://blog.51cto.com/flyfish225/2118098
CDH6.2扩容
原文：https://www.cnblogs.com/hongfeng2019/p/11370399.html
