Batch edge-journal metadata updates within a declared loss window
A metadata write for every status poll causes unnecessary emulated erase work. Batch only nonauthoritative counters.
- Focused work estimate
- 2h 45m + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Performance · Durability
Estimated field mix
- Performance engineering40%
- Storage systems30%
- Embedded and edge30%
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 edge display gateway stores noncritical synthetic readings while disconnected. Implement a byte-array flash emulator with explicit erase/write behavior and injected power cuts; no physical storage device is required.
Setup prerequisites
- Specify emulator page size write rules and erase behavior.
- Generate synthetic records and deterministic power-cut schedules.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- CJOUR-101 · Model edge-journal flash writes with explicit emulator constraints
- CJOUR-102 · Encode edge-journal records with bounded length and checksum
- CJOUR-103 · Assign edge-journal event identities independently from delivery attempts
- CJOUR-104 · Commit edge-journal records only after their marker is durable
- CJOUR-105 · Recover edge-journal scanning after a torn final record
- CJOUR-106 · Roll edge-journal writes onto a new page without overwriting unread events
- CJOUR-107 · Recover edge-journal page generation selection after power loss
- CJOUR-108 · Reclaim edge-journal pages only after durable delivery acknowledgements
Acceptance criteria
- Event commits remain durable
- Batching does not weaken acknowledgement protection
- Counter loss window is documented
Implementation constraints
- Do not batch safety-critical authority or claim real endurance improvement.
Verification to include
- Compare emulator operation counts
- Cut power before counter flush
Deliverables
- Counter batching and measured local trace
Rollout and recovery
Disable batching if authority depends on buffered counters.
Value of the work
For the engineer: Practice torn writes, wear-aware batching and acknowledged durability.
For the team: Inspect whether offline device records remain recoverable within stated 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.