http://www.ibm.com/developerworks/cn/data/library/bd-1404flumerevolution/index.html
https://flume.apache.org/
https://yq.aliyun.com/articles/50487
http://www.cnblogs.com/smartloli/p/4468708.html
http://www.jianshu.com/p/f0a08bd4f975
http://www.jianshu.com/p/befa9c06baad