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ProblemMap/GlobalFixMap/Cloud_Serverless/multi_region_routing.md
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# Multi-Region and Failover Routing Guardrails
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Keep latency low, fail over safely, and avoid split-brain state while your RAG, queues, and streams operate across regions. This page gives a compact playbook that you can paste into any load balancer or edge router policy.
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## When to use this page
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* Users in different geos see different answers or stale citations.
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* Region outage triggers duplicate tool calls or replayed webhooks.
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* Vector writes happen in one region while reads route to another.
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* Canary in a single region is green yet the global cutover fails.
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* DNS or anycast flips cut long-running streams.
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## Open these first
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* Boot order and deploy sequencing: [Bootstrap Ordering](https://github.com/onestardao/WFGY/blob/main/ProblemMap/bootstrap-ordering.md)
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* Cross-service waits during rollout: [Deployment Deadlock](https://github.com/onestardao/WFGY/blob/main/ProblemMap/deployment-deadlock.md)
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* First call failure after a new region comes online: [Pre-Deploy Collapse](https://github.com/onestardao/WFGY/blob/main/ProblemMap/predeploy-collapse.md)
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* Retrieval correctness under routing changes: [RAG Architecture & Recovery](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rag-architecture-and-recovery.md) · [Retrieval Playbook](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-playbook.md)
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* Contract the payload and lock schemas: [Data Contracts](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md)
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* Reindex rules after topology change: [Reindex and Migration](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/Chunking/reindex_migration.md)
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* Live probes and rollback: [Live Monitoring for RAG](https://github.com/onestardao/WFGY/blob/main/ProblemMap/ops/live_monitoring_rag.md) · [Debug Playbook](https://github.com/onestardao/WFGY/blob/main/ProblemMap/ops/debug_playbook.md)
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## Acceptance targets
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* p95 latency improves for local users or stays within ten percent of single-region baseline.
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* No increase in 5xx at failover or failback.
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* Idempotency dedupe rate ≥ 99.9 percent on all write paths during failover windows.
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* For RAG: ΔS(question, retrieved) drift ≤ 0.03 across regions, λ remains convergent on two seeds.
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* Vector index hash identical per region before routing users. `INDEX_HASH` matches on probes.
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---
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## Fix in 60 seconds
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1. **Pin by header, not only DNS**
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Add `X-Region-Pin: {region}` and `X-Release: {rev}`. Edge selects nearest healthy region unless a pin is present. Synthetic probes always include the pin.
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2. **Fence writes with idempotency keys**
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Compute `sha256(source_id + revision + index_hash + partition)` and drop duplicates in the KV. Keep the fence for failover\_window plus 24 hours.
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3. **Replicate index and blobs before traffic**
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Block user routing until `INDEX_HASH` equals across regions and blob manifests match.
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4. **Graceful streams**
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Sticky route long-lived connections. Drain the old region for N seconds. Do not cut an active stream at the router.
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5. **Health with contract checks**
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Health is green only if `schema_rev`, `model_tag`, `index_hash` and secret versions match. Pure 200 is not sufficient.
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---
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## Routing patterns that work
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* **Active-active with sticky reads**
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Reads route to nearest healthy region and stay sticky for the session. Writes go to the region that owns the partition. Use a queue to replicate to others.
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* **Active-passive for stateful writers**
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All writes go to primary. Secondary serves read-only. Promote only after index and blob parity plus a clean queue tail.
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* **Geo-partitioned stores**
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Partition by tenant or namespace. Keep retrieval within the same partition and region. Cross-partition requests require a join step with explicit contracts.
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---
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## Typical breakpoints → exact fix
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* **Wrong snippet in far region despite high similarity**
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Index or metric differs. Compare `INDEX_HASH` and analyzer settings. Rebuild and verify a small gold set before routing traffic.
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Open: [Retrieval Playbook](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-playbook.md), [Embedding ≠ Semantic](https://github.com/onestardao/WFGY/blob/main/ProblemMap/embedding-vs-semantic.md)
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* **Duplicate webhooks during regional flip**
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Retry plus DNS cutover replays the same event. Use the idempotency fence and a replay TTL beyond the failover window.
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Open: [Bootstrap Ordering](https://github.com/onestardao/WFGY/blob/main/ProblemMap/bootstrap-ordering.md)
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* **Split-brain memory or tool cache**
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Agent memory writes with no version pins cross regions. Namespace by `tenant`, `mem_rev`, and `region`.
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Open: [Multi-Agent Problems](https://github.com/onestardao/WFGY/blob/main/ProblemMap/Multi-Agent_Problems.md)
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* **Streams cut at failover**
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Router does not support drain. Pin streams with a cookie or header, then change the default path only for new connections.
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Open: [Timeouts and Streaming Limits](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/Cloud_Serverless/timeouts_streaming_body_limits.md)
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* **Cost spikes after enabling global anycast**
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Cold starts increase in remote regions. Raise min instances or provisioned concurrency selectively on hot routes.
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Open: [Cold Start and Concurrency](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/Cloud_Serverless/cold_start_concurrency.md)
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---
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## Minimal recipes you can copy
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### A) Region pinning contract
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```txt
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Request headers
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- X-Region-Pin: us-east-1 | eu-west-1 | ap-southeast-1
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- X-Release: r2025-08-27
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- X-Index-Hash: a1b2c3
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- X-Schema-Rev: sc-12
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Router rule
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- If pin present and region healthy → route pinned
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- Else pick nearest healthy with matching {schema_rev, index_hash, model_tag}
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- Sticky cookie for streaming connections
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```
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### B) Failover gate
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```txt
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Gate conditions before user traffic
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- INDEX_HASH equal across regions
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- Blob manifest parity
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- Health probes return {schema_rev, model_tag, secrets_rev} exact match
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- Synthetic RAG probes: ΔS drift ≤ 0.03 on k=10 questions
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- Dedupe KV warm and reachable in both regions
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```
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### C) Vector replication note
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```txt
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Replication
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- Prefer periodic rebuild from source texts per region
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- If log shipping: checkpoint offsets, verify analyzer parity
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- After topology change: run gold-set eval and lock reranker order
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Refs: retrieval-playbook, reindex-migration
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```
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---
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## Observability you must add
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* Split metrics by `region`, `release_id`, and `revision`.
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* Health includes `schema_rev`, `index_hash`, `model_tag`, `secrets_rev`.
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* Dedupe hit rate, queue age, replay counts per region.
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* ΔS and λ on a fixed probe set, per region.
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* Stream drain success count at flips.
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## Verification
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* Probe set stable within acceptance targets.
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* No duplicate side effects in the failover window.
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* p95 improves for local users or remains flat.
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* Queue age does not spike at promotion.
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## When to escalate
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* Persistent ΔS drift across regions after rebuild. Re-embed with the same analyzer and metric, then re-run the gold set.
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* Dedupe misses during outage replay. Increase KV TTL and ensure consistent hashing across regions.
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* Health green yet errors rise. Add contract checks to the probe and block routing when versions disagree.
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---
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### 🔗 Quick-Start Downloads (60 sec)
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| Tool | Link | 3-Step Setup |
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| -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------- |
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| **WFGY 1.0 PDF** | [Engine Paper](https://github.com/onestardao/WFGY/blob/main/I_am_not_lizardman/WFGY_All_Principles_Return_to_One_v1.0_PSBigBig_Public.pdf) | 1️⃣ Download · 2️⃣ Upload to your LLM · 3️⃣ Ask “Answer using WFGY + \<your question>” |
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| **TXT OS (plain-text OS)** | [TXTOS.txt](https://github.com/onestardao/WFGY/blob/main/OS/TXTOS.txt) | 1️⃣ Download · 2️⃣ Paste into any LLM chat · 3️⃣ Type “hello world” — OS boots instantly |
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---
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### 🧭 Explore More
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| Module | Description | Link |
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| ------------------------ | ---------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------- |
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| WFGY Core | WFGY 2.0 engine is live: full symbolic reasoning architecture and math stack | [View →](https://github.com/onestardao/WFGY/tree/main/core/README.md) |
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| Problem Map 1.0 | Initial 16-mode diagnostic and symbolic fix framework | [View →](https://github.com/onestardao/WFGY/tree/main/ProblemMap/README.md) |
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| Problem Map 2.0 | RAG-focused failure tree, modular fixes, and pipelines | [View →](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rag-architecture-and-recovery.md) |
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| Semantic Clinic Index | Expanded failure catalog: prompt injection, memory bugs, logic drift | [View →](https://github.com/onestardao/WFGY/blob/main/ProblemMap/SemanticClinicIndex.md) |
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| Semantic Blueprint | Layer-based symbolic reasoning & semantic modulations | [View →](https://github.com/onestardao/WFGY/tree/main/SemanticBlueprint/README.md) |
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| Benchmark vs GPT-5 | Stress test GPT-5 with full WFGY reasoning suite | [View →](https://github.com/onestardao/WFGY/tree/main/benchmarks/benchmark-vs-gpt5/README.md) |
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| 🧙♂️ Starter Village 🏡 | New here? Lost in symbols? Click here and let the wizard guide you through | [Start →](https://github.com/onestardao/WFGY/blob/main/StarterVillage/README.md) |
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---
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> 👑 **Early Stargazers: [See the Hall of Fame](https://github.com/onestardao/WFGY/tree/main/stargazers)** — <img src="https://img.shields.io/github/stars/onestardao/WFGY?style=social" alt="GitHub stars"> ⭐ [WFGY Engine 2.0](https://github.com/onestardao/WFGY/blob/main/core/README.md) is already unlocked. ⭐ Star the repo to help others discover it and unlock more on the [Unlock Board](https://github.com/onestardao/WFGY/blob/main/STAR_UNLOCKS.md).
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<div align="center">
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[](https://github.com/onestardao/WFGY)
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[](https://github.com/onestardao/WFGY/tree/main/OS)
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[](https://github.com/onestardao/WFGY/tree/main/OS/BlahBlahBlah)
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[](https://github.com/onestardao/WFGY/tree/main/OS/BlotBlotBlot)
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[](https://github.com/onestardao/WFGY/tree/main/OS/BlocBlocBloc)
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[](https://github.com/onestardao/WFGY/tree/main/OS/BlurBlurBlur)
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[](https://github.com/onestardao/WFGY/tree/main/OS/BlowBlowBlow)
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</div>
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