Pause mobile transfers when storage reservation fails
A nearly full emulator accepts several downloads and fails unpredictably. Reserve a bounded budget before writing.
- Focused work estimate
- 2h 15m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Resource management · Concurrency
Estimated field mix
- Storage systems50%
- Mobile30%
- Performance 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
Fictional learning app Birch offers synthetic text and small local media fixtures through a loopback adapter. No copyrighted course assets or network accounts are needed.
Setup prerequisites
- Create small local byte fixtures and a range-response stub.
- Simulate low storage, interruptions and stale manifests.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Admission accounts for active transfers
- Failure preserves existing content
- User sees required space
Implementation constraints
- Reservation estimates must state uncertainty.
Verification to include
- Admit fitting transfer
- Start competing transfers exceeding budget
Deliverables
- Storage admission policy
Rollout and recovery
Stop new transfers while preserving installed courses.
Value of the work
For the engineer: Practice mobile file lifecycles and background state recovery.
For the team: Inspect predictable resource usage and truthful download status.
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.