Write the staged regional-read adoption and rollback plan
The architecture review approves a limited regional tracking view, but the rollout ticket still says switch all traffic.
- Focused work estimate
- 2h + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Rollout design · Architecture communication
Estimated field mix
- System design60%
- Platform engineering40%
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 logistics dashboard serves distant customers from one primary region. Stakeholders want faster reads and outage recovery but have not agreed which data may be stale.
Setup prerequisites
- Create a local primary/replica simulator and synthetic shipment records.
- Use local models; no multi-region infrastructure is provisioned.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- AREGION-101 · Classify shipment reads by tolerated staleness
- AREGION-102 · Calculate regional latency contributions with stated assumptions
- AREGION-103 · Record the decision between regional caching and replica reads
- AREGION-104 · Define a read-after-write token for shipment changes
- AREGION-105 · Fence regional write authority before promoting a standby
- AREGION-106 · Preserve command identity across a regional routing retry
- AREGION-107 · Define regional fallback for unavailable authorization freshness
- AREGION-108 · Model recovery-point and recovery-time limits for a regional outage
- AREGION-109 · Reconcile divergent regional observations after connectivity returns
Acceptance criteria
- Start with the approved read class and synthetic cohort.
- Define freshness and denial checks before wider routing.
- Rollback by restoring primary routing without rewriting accepted data.
Implementation constraints
- Include unresolved dependencies as explicit blockers.
Verification to include
- Walk a permitted tracking request through the proposed rollout.
- Trigger stale authorization and verify protected traffic stays on the declared safe path.
Deliverables
- Regional adoption plan and decision checklist
Rollout and recovery
Review the plan with the local simulator; retain a primary-routing override for recovery.
Value of the work
For the engineer: Practice consistency tradeoffs, failover authority and recovery assumptions.
For the team: Review regional availability proposals with explicit data-loss and staleness limits.
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.