https://github.com/twitter/snowflake/releases/tag/snowflake-2010
http://boundary.com/blog/2012/01/12/flake-a-decentralized-k-ordered-unique-id-generator-in-erlang/
http://heipark.iteye.com/category/126118
http://blog.sina.com.cn/s/blog_56fd58ab0100wga0.html
http://www.infoq.com/cn/articles/Visualizing-Java-Garbage-Collection
http://wenku.baidu.com/link?url=s0Ro6vR9JyqGbANbMXFr1CXPBMfsTBJFdhfew4dqiIpHli_Wl6FTBeb8e7ld8TEH8hPZdi7kAtLUz6zpM9aye164BeaPEA82OuTOCBjA5DS