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http://www.doc88.com/p-8981601263112.html
http://www.360doc.com/content/16/0823/11/14513665_585293946.shtml
http://www.cnblogs.com/lpshou/archive/2013/06/14/3136738.html
http://blog.sina.com.cn/s/blog_478fa0650100sg3o.html
http://blog.itpub.net/30316686/viewspace-2106956/
http://blog.csdn.net/mayp1/article/details/51871761
https://en.wikipedia.org/wiki/Atomic_broadcast