Model partial apply recovery without assuming atomic infrastructure changes
A plan contains several resource updates, and the third may fail after earlier changes succeed.
- Focused work estimate
- 5h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Infrastructure design · Recovery
Estimated field mix
- Cloud infrastructure40%
- System design30%
- Site reliability30%
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
A fictional application team manages a small database, cache, and object store. Reviewers struggle to distinguish harmless configuration changes from destructive replacements.
Setup prerequisites
- Author synthetic infrastructure plans and state snapshots; use local files only and no cloud credentials.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- BIAC-101 · Normalize infrastructure resource actions for review
- BIAC-102 · Redact sensitive plan values while preserving review context
- BIAC-103 · Flag replacements of persistent resources with recovery requirements
- BIAC-104 · Reject public exposure introduced by default configuration
- BIAC-105 · Validate backup retention changes against declared recovery policy
- BIAC-106 · Detect plan drift between review and execution
- BIAC-107 · Keep infrastructure workspace identities from crossing environments
Acceptance criteria
- Identify dependency-ordered partial states.
- Compare forward repair and rollback per resource.
- Preserve completed changes in the recovery record.
Implementation constraints
- Do not present infrastructure apply as one database transaction.
Verification to include
- Simulate failure after two accepted changes.
- Reject a rollback that would delete newly authoritative data.
Deliverables
- Partial-apply recovery decision record.
Rollout and recovery
Keep execution hypothetical until target-specific recovery is verified.
Value of the work
For the engineer: Practice infrastructure risk analysis, plan integrity, and least-privilege change workflows.
For the team: Give infrastructure reviewers concrete change scope and recovery consequences.
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.