Review cache warmup without creating a database stampede
Every process warms the same popular course pages simultaneously after deployment.
- Focused work estimate
- 3h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Caching · Load control
Estimated field mix
- Performance engineering50%
- Distributed systems30%
- Site reliability20%
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 course platform expects a registration deadline spike. Capacity assumptions, escalation ownership, and degradation decisions are scattered across old documents.
Setup prerequisites
- Create synthetic registration traces and local dependency doubles with finite connection and request limits.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- BREADINESS-101 · Turn the registration forecast into a workload envelope
- BREADINESS-102 · Inventory dependency quotas and exhaustion behavior
- BREADINESS-103 · Add connection-pool wait time to registration diagnostics
- BREADINESS-104 · Exercise registration idempotency during client reconnects
- BREADINESS-105 · Decouple confirmation delivery from accepted registration
- BREADINESS-106 · Test read-only degradation when enrollment writes are unavailable
Acceptance criteria
- Bound warmup concurrency and total work.
- Coalesce identical cache fills.
- Keep cache failure from multiplying database reads.
Implementation constraints
- Use a finite synthetic course list.
Verification to include
- Warm popular entries under the configured budget.
- Expire entries together and verify bounded database pressure.
Deliverables
- Cache warmup controller.
Rollout and recovery
Warm gradually before synthetic peak; disable warmup if database wait rises.
Value of the work
For the engineer: Practice readiness reviews, capacity reasoning, and cross-functional operational handoffs.
For the team: Produce a concrete launch-readiness assessment with measurable risks and recovery actions.
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.