需要补的坑

1. Zookeeper

http://blog.csdn.net/liweisnake/article/details/70045164

https://www.jianshu.com/p/74a12162fa03?utm_campaign=maleskine&utm_content=note&utm_medium=seo_notes&utm_source=recommendation

http://blog.jobbole.com/104985/

https://my.oschina.net/lhztt/blog/995114