http://mt.sohu.com/20150604/n414449770.shtml
http://my.oschina.net/mkh/blog/330386
http://itindex.net/detail/51632-spark-%E7%BB%8F%E9%AA%8C
http://itindex.net/detail/51631-spark-%E7%BB%8F%E9%AA%8C
原文：http://www.cnblogs.com/liuchangchun/p/4718313.html