Record the decision between regional caching and replica reads
The team jumps to database replicas when a scoped cache might cover the tolerated-staleness tracking view.
- Focused work estimate
- 2h + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Architecture decisions · Caching tradeoffs
Estimated field mix
- System design50%
- Database engineering30%
- Distributed systems20%
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.
Acceptance criteria
- Compare invalidation, freshness, failure and operational costs.
- Keep sensitive and read-after-write paths explicit.
- Name a workload or consistency change that revisits the choice.
Implementation constraints
- Do not assume an additional region is free or already configured.
Verification to include
- Evaluate both options against one tracking read.
- Evaluate an authorization change and reject an option that cannot enforce it.
Deliverables
- Regional-read architecture decision
Rollout and recovery
Review using the consistency matrix; implement only the smallest local prototype selected.
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.