1. refer:
http://www.cnblogs.com/zl0372/articles/redis_8.html
http://www.cnblogs.com/aixiaomei/p/6311633.html
http://blog.huangz.me/diary/2014/how-to-read-redis-source-code.html
http://gudaoqing.blog.51cto.com/7729345/1601114
http://blog.csdn.net/caishenfans/article/details/44784131
redis 持久化的两种方式
http://blog.csdn.net/u012129558/article/details/51507588
redis跳跃表：
http://blog.csdn.net/acceptedxukai/article/details/17333673
http://blog.csdn.net/universe_ant/article/details/51134020 这个讲得好
压缩列表ziplist
http://blog.csdn.net/u012658346/article/details/51321337