Bound parallel check fan-out per organization and run
One tenant submits many documents and the coordinator starts every check immediately, exhausting provider slots.
- Focused work estimate
- 1h 30m + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Concurrency budgets · Admission control
Estimated field mix
- Distributed systems50%
- Performance engineering30%
- Platform engineering20%
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 vendor portal runs format, policy and duplicate checks in parallel. A slow checker blocks completion, while duplicate callbacks can produce contradictory final summaries.
Setup prerequisites
- Create synthetic document identities and three fake check providers.
- No real risk scoring, hiring decisions or candidate execution is included.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Set explicit per-run and per-tenant in-flight limits.
- Persist queued attempts instead of dropping them.
- Return admission status separate from check completion.
Implementation constraints
- Use documented synthetic limits and a fake provider counter.
Verification to include
- Dispatch a permitted number of synthetic checks.
- Exceed the tenant limit and verify excess work remains queued without provider calls.
Deliverables
- Fan-out admission guard
Rollout and recovery
Canary conservative limits; pause admission when provider capacity is unknown.
Value of the work
For the engineer: Practice fan-out/fan-in, deadline policies and immutable aggregation.
For the team: Review trustworthy partial-result handling and controllable parallel work.
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.