转发：
https://blog.csdn.net/MrZhangBaby/article/details/88319498?utm_medium=distribute.pc_aggpage_search_result.none-task-blog-2~all~sobaiduend~default-1-88319498.nonecase&utm_term=ambari%E5%92%8Ccdh%E7%9A%84%E5%8C%BA%E5%88%AB&spm=1000.2123.3001.4430
原文：https://www.cnblogs.com/whxiao/p/13935433.html