問題文
A platform attaches the consent state to each record so consumers can decide locally. A user withdraws consent. Records already in flight and in downstream stores still carry the old state. What does the design have to add?
選択肢
- Nothing, because the attached state will be refreshed at the next write, and every record in the platform is rewritten in the course of normal daily operation.
- A validity period on the attached state and a rule that a consumer must re-check when it expires, so a withdrawal takes effect within a bounded time.
- Some mechanism that pushes the withdrawal to every downstream store as soon as it is recorded, because a withdrawal that takes effect only when a validity period expires leaves the processing running for as long as that period lasts, and the only design that honors the withdrawal properly is one in which the change propagates to every holder of the state immediately.
- One requirement that consumers always call the central store before processing, so that the attached state is treated as a hint and never as the decision itself.