Flink之状态编程OperatorState的使用
https://developer.aliyun.com/article/926426
Flink中状态的自动管理
https://blog.csdn.net/tototuzuoquan/article/details/125669059
flink--state状态管理
https://blog.csdn.net/longlovefilm/article/details/103754115
Flink SQL空闲状态保留时间(idle state retention time)实现原理
https://blog.csdn.net/nazeniwaresakini/article/details/112306222
通过WordCount来理解Flink的状态与容错,checkpoint如何恢复?Flink学习入门(四)
https://blog.csdn.net/weixin_38586230/article/details/109706867