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ProblemMap/GlobalFixMap/OpsDeploy/cache_warmup_invalidation.md
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ProblemMap/GlobalFixMap/OpsDeploy/cache_warmup_invalidation.md
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# Cache Warmup and Invalidation: OpsDeploy Guardrails
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Warm caches stop cold-start spikes and prevent stampedes. Correct invalidation prevents stale or cross-index answers. Use this page to design keys, warmup order, and safe evictions for RAG and agent pipelines.
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---
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## Open these first
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- Readiness gate: [rollout_readiness_gate.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/rollout_readiness_gate.md)
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- Version locking: [version_pinning_and_model_lock.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/version_pinning_and_model_lock.md)
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- Index build and swap: [vector_index_build_and_swap.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/vector_index_build_and_swap.md)
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- Canary staging: [staged_rollout_canary.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/staged_rollout_canary.md)
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- Traceability and contracts: [retrieval-traceability.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md), [data-contracts.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md)
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- Live ops: [live_monitoring_rag.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/ops/live_monitoring_rag.md), [debug_playbook.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/ops/debug_playbook.md)
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---
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## When to use
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- After index rebuilds or alias flips.
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- When prompts, models, rerankers, or analyzers change.
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- If first calls after deploy are slow or inconsistent.
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- If users see stale citations or mixed-arm results.
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- If retry storms or thundering herd appear under load.
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---
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## Acceptance targets
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- First production call warms within 5 minutes of release.
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- ΔS(question, retrieved) ≤ 0.45 on three paraphrases after warmup.
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- Coverage ≥ 0.70 to the target section.
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- λ convergent across two seeds with warmed headers.
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- Duplicate side effects = 0 during warmup window.
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---
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## 60-second warmup plan
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1) **Partition the cache by version**
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Include these in every cache key: `INDEX_HASH`, `PROMPT_VER`, `MODEL_VER`, `RERANK_CONF`, and optionally `TENANT_ID`, `LOCALE`.
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See: [version_pinning_and_model_lock.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/version_pinning_and_model_lock.md)
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2) **Prime the hot paths**
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Run a 20–40 item gold set to fill retrieval and rerank caches. Verify citations and offsets.
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See: [retrieval-traceability.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md)
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3) **Enable single-flight**
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Coalesce identical misses so only one worker computes each key. Stampede protection is mandatory.
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4) **Set layered TTLs**
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Short TTL for query→top-k, slightly longer for rerank→final set, shortest for negative cache. Use jitter.
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5) **Wire safe evictions**
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Do not scan and delete. Flip namespace by changing the versioned prefix. Old space dies out naturally.
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---
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## Key design: scope and structure
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- **Two-level cache**
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L1: query normalization → candidate ids.
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L2: candidate ids → ranked snippets with citation fields.
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- **Key template**
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```
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L1: q:{hash(query\_norm)}:{INDEX\_HASH}:{PROMPT\_VER}:{RERANK\_CONF}
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L2: r:{hash(candidates)}:{INDEX\_HASH}:{PROMPT\_VER}:{RERANK\_CONF}
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````
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If locale, tokenizer, or analyzer can change results, add `LOCALE`, `TOK_VER`, `ANALYZER_CONF`.
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- **What never to cache**
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Tool call side effects or write steps. Use idempotency fences.
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See: [idempotency_dedupe.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/idempotency_dedupe.md)
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---
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## Invalidation strategy
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- **Prefer namespace rotation over delete**
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Keys carry the current `INDEX_HASH` and `PROMPT_VER`. A swap creates a new namespace. Old keys expire on TTL.
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- **Trigger list that must rotate namespace**
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- Index alias flips or index rebuilds.
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- Prompt pack changes or header reordering.
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- Reranker cutoff or model version changes.
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- Analyzer or tokenizer changes.
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- **Negative cache discipline**
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Cache misses for a short time only. TTL 10–30 seconds with jitter to avoid synchronized expiry.
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- **Per-tenant isolation**
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If tenants use different corpora or flags, put `TENANT_ID` into the key prefix. Never share warmed entries across tenants.
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---
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## Warmup ordering
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1) Secrets and boot order pass.
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See: [bootstrap-ordering.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/bootstrap-ordering.md)
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2) Retriever reports `INDEX_HASH` ready.
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3) Run the gold set to fill L1 and L2.
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4) Prime common user queries and help topics.
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5) Verify ΔS, coverage, λ on warmed paths.
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6) Open canary at 5 percent.
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See: [staged_rollout_canary.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/staged_rollout_canary.md)
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---
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## Stampede control
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- **Single-flight lock** for each key with a short lease.
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- **Request collapsing** by query hash.
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- **Backoff and queueing** on provider 429/5xx.
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- **Circuit breakers** for downstream stores.
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---
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## Store-specific notes
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- **Redis**
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Avoid `SCAN DEL`. Use versioned prefixes. For atomic set-if-absent plus short lock, use `SET key val NX PX=ms`.
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- **CDN or edge**
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Only cache read-only pages. For dynamic RAG responses, keep cache at app or Redis with versioned keys.
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- **Vector result caches**
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Key by `INDEX_HASH` and metric. If metric or normalization changes, treat as a new namespace.
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See: [metric_mismatch.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/Embeddings/metric_mismatch.md), [normalization_and_scaling.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/Embeddings/normalization_and_scaling.md)
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- **Fragmented stores**
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If hit distributions vary wildly across partitions, caching will mask deeper issues. Fix the store first.
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See: [pattern_vectorstore_fragmentation.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/patterns/pattern_vectorstore_fragmentation.md)
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---
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## Example: single-flight and versioned key (pseudo)
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```python
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ver = f"{INDEX_HASH}:{PROMPT_VER}:{RERANK_CONF}"
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k1 = f"q:{hash(query_norm)}:{ver}"
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if redis.set(f"lock:{k1}", "1", nx=True, px=3000):
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try:
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val = compute_topk(query_norm)
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ttl = jitter(60, 15) # 60s ±15%
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redis.set(k1, serialize(val), ex=ttl)
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finally:
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redis.delete(f"lock:{k1}")
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else:
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sleep(0.05); val = redis.get(k1) or wait_poll(k1)
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return val
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````
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---
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## Observability fields to log
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* Version pins: `INDEX_HASH`, `PROMPT_VER`, `MODEL_VER`, `RERANK_CONF`, `TOK_VER`, `ANALYZER_CONF`.
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* Cache events: hit, miss, fill time, lock wait, evict reason.
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* Quality: ΔS(question, retrieved), ΔS(retrieved, anchor), coverage, λ states.
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* Latency p50 and p95 for retrieve, rerank, reason.
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---
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## Common pitfalls
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* Deleting keys in place which causes long stalls. Rotate namespace instead.
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* Mixed caches across regions or tenants. Prefix by region and `TENANT_ID`.
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* Cache keys without `INDEX_HASH`, leading to stale blends after a swap.
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* Negative cache with long TTL, causing false “no answer” pockets.
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* Warming only L1 but not L2, so reranker work still stampedes.
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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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