ai-enabled-hr-talent-automation

Resilience and Disaster Recovery

Title: Resilience and Disaster Recovery Version: 1.0 Owner: [TENANT_CONFIGURATION_REQUIRED — Architecture/DevOps] Status: Draft Last reviewed: 2026-09-07 Next review: [TENANT_CONFIGURATION_REQUIRED] Reviewers: Architecture, DevOps, Security

Purpose and scope

Defines resilience patterns for transient failures and disaster-recovery strategy for larger outages. Complements deployment-architecture.md (RTO/RPO targets) and integration-architecture.md (retry/circuit-breaker/DLQ patterns).

Resilience patterns in force

Pattern	Scope	Configuration key
Idempotency keys	All command APIs, all event consumers	`resilience.idempotency.*`
Optimistic concurrency (ETag/version)	All mutable entities	`resilience.concurrency.*`
Retry with exponential backoff + jitter	All external/MCP calls	`resilience.retry.*`
Circuit breaker	Per external system adapter	`resilience.circuit_breaker.*`
Dead-letter queue + alert	Message bus consumers	`resilience.dlq.*`
Bulkhead (resource isolation)	Agent Plane vs. Core API (separate pools)	`resilience.bulkhead.*`
Timeout budgets	Every synchronous call, including LLM/tool calls	`resilience.timeouts.*`
Graceful degradation	RAG retrieval failure → “no-answer” fallback, not a hard error	`rag.no_answer_fallback`

Default values live in config/defaults/platform.default.yaml; see platform-config.schema.json.

Disaster recovery strategy

flowchart LR
    A[Primary Region] -- continuous backup --> B[(Backup Store)]
    A -- async replication --> C[Secondary Region - warm standby]
    B --> D{DR Trigger}
    C --> D
    D -->|Failover| E[Promote Secondary / Restore from Backup]
    E --> F[Validate data integrity + audit continuity]
    F --> G[Resume traffic]

Failure scenario	Detection	Response
Database primary failure	Health checks / managed-DB failover	Automated failover to replica (managed service), validate RPO
Full region outage	Multi-region health checks	Manual or automated failover to secondary region per DR runbook
Object storage outage	Health checks	Serve cached metadata; block new uploads with clear error; no data loss (durable storage layer)
Vector store outage	Health checks	Fall back to “no-answer” RAG mode; core workflow unaffected (vector store is not system of record)
Message bus outage	Health checks	Outbox retains events; relay resumes on recovery — no event loss
MCP server outage (single integration)	Circuit breaker	Isolated to that integration; workflow continues, manual fallback offered to users

Backup and restore

RDBMS: continuous point-in-time backup, tested restore on a configurable cadence (default: quarterly — [TENANT_CONFIGURATION_REQUIRED]).
Object storage: versioning + soft-delete retention window (see data-classification-and-retention.md).
Vector store: rebuildable from source documents; not independently backed up as a hard requirement.

Chaos/resilience testing

See test-strategy.md for the chaos/resilience test tier (e.g., inject MCP timeouts, kill outbox relay, simulate DB failover) run in staging on a configurable cadence.

Assumptions and dependencies

Actual RTO/RPO contractual commitments and DR test cadence are [TENANT_CONFIGURATION_REQUIRED].

Risks and open questions

Cross-region data residency constraints may prohibit a warm-standby secondary region in some jurisdictions — [LEGAL_REVIEW_REQUIRED].

Change control

Version	Date	Author	Change
1.0	2026-09-07	Documentation package generation	Initial creation

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