Hadoop版本：CDH, HDP, MapR
學習了：http://dongxicheng.org/mapreduce-nextgen/hadoop-distribution-selection/
https://www.cnblogs.com/jinhaolin/p/6750295.html
http://blog.csdn.net/xiangxizhishi/article/details/75711242
CDH: Cloudera Distribution for Hadoop
HDP: Hortonworks Data Platform