Verify archive cache fills before promoting temporary bytes
Interrupted origin reads leave files that future requests treat as complete. Stage and verify each fill.
- Focused work estimate
- 2h 15m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Integrity · Atomic publication
Estimated field mix
- Storage systems100%
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 media archive Ash serves generated byte fixtures through a fast local cache and slower provider stub. Both tiers run locally.
Setup prerequisites
- Create immutable generated blobs with known digests.
- Implement controllable cache and origin adapters with read failures.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Fill checks declared digest
- Unverified files stay invisible
- Failed fill removes or quarantines its temporary file
Implementation constraints
- Promotion must not expose partial bytes.
Verification to include
- Fill valid fixture
- Truncate origin stream
Deliverables
- Verified fill and failure cases
Rollout and recovery
Disable cache writes while serving origin directly.
Value of the work
For the engineer: Practice cache correctness, request coalescing and capacity control.
For the team: Inspect whether faster delivery preserves bytes and operating limits.
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.