http://www.cnblogs.com/mindwind/p/6106425.html (it soft knowledge)
https://tech.meituan.com/cache_about.html
http://www.cnblogs.com/paddix/p/5405678 .html(concurrency)
non-technical
https://www.zhihu.com/question/23448090
https://my.oschina.net/pingpangkuangmo/home?type=&scope=all&showme=NOTSHOW&p=2&temp=1502432789566
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