Retry the same multipart part without creating contradictory receipts
A timeout after part acceptance leads to duplicate receipts with different checksums. Bind retries to part number and digest.
- Focused work estimate
- 3h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Idempotency · Integrity
Estimated field mix
- Storage systems50%
- Distributed systems50%
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 document archive Fern stores synthetic byte objects. Use a local S3-compatible adapter or deterministic in-memory provider; no cloud credentials are needed.
Setup prerequisites
- Generate small deterministic byte fixtures.
- Implement local multipart provider responses including timeout and missing parts.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Same bytes return stable receipt
- Different bytes require explicit replacement
- Uncertain responses reconcile with provider state
Implementation constraints
- Provider ETag is opaque unless contract says otherwise.
Verification to include
- Retry identical part
- Retry changed bytes under same operation
Deliverables
- Part-retry coordinator and cases
Rollout and recovery
Stop retries and expose reconciliation status.
Value of the work
For the engineer: Practice object lifecycle, retry semantics and integrity verification.
For the team: Inspect whether uploads avoid corruption, orphan cost and tenant crossover.
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.