Atomically adopt a validated configuration snapshot in each process
A process updates settings one field at a time, briefly combining a new retry count with an old deadline.
- Focused work estimate
- 3h 30m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Concurrency · Configuration delivery
Estimated field mix
- Platform engineering60%
- Backend40%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
A fictional internal reporting platform changes feature and timeout settings through environment edits. Partial rollouts leave API and worker processes interpreting different values.
Setup prerequisites
- Create local API and worker configuration consumers.
- Use fabricated settings without secrets.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Validate the full snapshot before replacing the active reference.
- Each request captures one revision for its lifetime.
- Failed adoption retains the complete previous snapshot.
Implementation constraints
- Avoid mutating shared configuration objects after publication.
Verification to include
- Switch snapshots during requests and observe one revision per request.
- Reject one invalid field and retain every previous value.
Deliverables
- Atomic consumer adapter and concurrent-read probe
Rollout and recovery
Canary a local worker consumer; pin its previous revision if adoption fails.
Value of the work
For the engineer: Practice configuration contracts, compatibility and failure recovery.
For the team: Review controlled configuration delivery with inspectable blast radius.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.