https://juejin.im/post/5cdd57966fb9a03212507c7b#heading-12

数据同步流程图
https://blog.csdn.net/varyall/article/details/79564418

数据同步附带源码和一些流程图分析
https://cheng-dp.github.io/2019/04/13/zookeeper-data-storage-and-data-sync/#zkdatabase