Build a workload that preserves offered arrival rate
A closed-loop load script hides overload by sending fewer requests as responses slow.
- Focused work estimate
- 3h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Load testing
Estimated field mix
- Performance engineering70%
- Quality engineering30%
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
- Record offered, admitted, completed, and rejected rates.
- Use bounded open-loop scheduling.
- Report dropped generator work and resource limits.
Implementation constraints
- Run only against the local fixture.
Verification to include
- Generate the declared steady arrival rate.
- Overload the generator and report its invalid measurement window.
Deliverables
- Load harness.
Rollout and recovery
Cap duration and concurrency; discard runs with unreported generator saturation.
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.