回复： why we need keyed state and operate state when we already have checkpoint?

So state: store the result of some operator(such as keyby,map) Checkpoint: store the last result when the program is running OK. Am I right? Thanks for your help~! --原始邮件-- 发件人:

回复： why we need keyed state and operate state when we already have checkpoint?

Thanks for your replies. When I use no state-relevant code in my program,the checkingpoint can be saved and resumed.❶ So then why we needKeyed State/Operator State/Stateful Function?❷ "the operators are reset to the time of the respective checkpoint." We already have met the requirement:"resume