Exercise registration idempotency during client reconnects
A network interruption causes clients to resubmit successful registrations.
- Focused work estimate
- 3h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Idempotency · Concurrency
Estimated field mix
- Backend40%
- Quality engineering30%
- Distributed systems30%
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.
Acceptance criteria
- Reuse stable submission identity.
- Preserve one enrollment per intended registration.
- Return the accepted result on exact replay.
Implementation constraints
- Conflicting payload reuse must fail explicitly.
Verification to include
- Replay after a lost response.
- Race two conflicting submissions under one identity.
Deliverables
- Reconnect regression suite.
Rollout and recovery
Gate the surge rehearsal on idempotency correctness.
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.