http://mysqllover.com/?p=708
https://yq.aliyun.com/articles/54454
http://blog.csdn.net/zhaiwx1987/article/details/6685156
http://bugs.mysql.com/search.php?cmd=display&status=Active&reporter=5698040
http://www.orczhou.com/index.php/2012/11/mysql-innodb-source-code-optimization-1/