Preserve fair access across tenant request queues
One large tenant fills every waiting slot and blocks smaller tenants.
- Focused work estimate
- 3h 30m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Fair scheduling
Estimated field mix
- Performance engineering40%
- Platform engineering40%
- 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 ticketing service becomes unresponsive during event releases because optional recommendation calls consume the same resources as reservation checks.
Setup prerequisites
- Build a bounded local service and synthetic open-loop workload generator with controllable dependency delays.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Bound per-tenant queued work.
- Define a transparent scheduling policy.
- Prevent idle tenant allocation from wasting all spare capacity.
Implementation constraints
- Use synthetic tenant classes and document fairness assumptions.
Verification to include
- Serve concurrent tenants under sustained load.
- Flood one tenant and verify others retain declared progress.
Deliverables
- Tenant scheduling policy.
Rollout and recovery
Trial with fixed limits; disable new policy if starvation appears.
Value of the work
For the engineer: Practice overload behavior, admission control, and fair performance experiments.
For the team: Create predictable failure and degradation behavior under declared capacity constraints.
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.