Prevent a new blob reference racing with reclamation
A document attaches a blob while cleanup deletes its file. Coordinate reference admission and deletion eligibility.
- Focused work estimate
- 4h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Concurrency · Transactions
Estimated field mix
- Database engineering60%
- Storage systems40%
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 archive Moss deduplicates generated attachments across documents within each organization. Use local files and transactional metadata stubs.
Setup prerequisites
- Generate duplicate and unique local byte fixtures.
- Create synthetic document references across two organizations.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- New reference either cancels eligibility or fails explicitly
- Deletion cannot remove newly referenced bytes
- Retried admission is safe
Implementation constraints
- Choose and document one atomic state protocol.
Verification to include
- Attach before claim
- Race attachment against deletion claim
Deliverables
- Reclamation protocol and interleaving tests
Rollout and recovery
Disable reclamation if the mutual-exclusion invariant fails.
Value of the work
For the engineer: Practice reclamation races and explicit data-lifecycle guarantees.
For the team: Inspect whether storage cleanup avoids broken references and hidden retention.
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.