WFGY/ProblemMap/predeploy-collapse.md

# 📒 Pre‑Deploy Collapse Problem Map  
*“Everything looked fine in CI… until **nothing** booted in prod.”*

Pre‑deploy collapse happens **before** a single user query is served.  
Migrations pass, tests are green, images ship — yet the first container
crashes or the very first LLM call returns a 500. Common root causes:

* Model checkpoint ≠ tokenizer version  
* Env var misspells (e.g., `OPEN_API_KEY` vs `OPENAI_API_KEY`)  
* Hidden f‑strings / Jinja placeholders left unresolved  
* GPU drivers mismatch container base (CUDA 11 vs 12)

WFGY’s *pre‑flight sanity layer* runs a semantic diff between **declared**
runtime and **effective** runtime, catching mismaps before traffic starts.

---

## 🚨 Typical Pre‑Deploy Collapses

| Pattern                               | Real‑World Fallout                   |
| ------------------------------------- | ------------------------------------ |
| Tokenizer / checkpoint version skew   | Embeds garbage; queries 0 % recall   |
| Missing secret in K‑V store           | First API call 401 / segfault        |
| CUDA / driver mismatch                | GPU container exits code 139         |
| Undigested template vars (`{{ }}`)    | Prompt crashes, empty completions    |

---

## 🛡️ WFGY Pre‑Flight Guards

| Collapse Pattern      | Guard Module            | Remedy                               | Status |
| --------------------- | ----------------------- | ------------------------------------ | ------ |
| Version skew          | **SemVers Diff**        | Abort deploy if `model.json` ↔ runtime mismatch | ✅ Stable |
| Missing secret        | **Boot Checkpoint**     | Block start until secret present     | ✅ Stable |
| Driver mismatch       | **Cuda‑Probe**          | Warn & fall back to CPU safe mode    | ⚠️ Beta |
| Stray `{{var}}` tokens| **Prompt Lint**         | Fail CI; highlight undeclared vars   | ✅ Stable |

---

## 📝 How It Works

1. **SemVers Diff**  
   Parses `model‑card.json`, compares `tokenizer_sha`, `pytorch_sha`,
   `cuda`, etc., with container runtime; throws if mismatch unless
   `--force`.

2. **Boot Checkpoint** *(shared)*  
   Kubernetes init‑container polls secret store; fails pod after
   `secret_timeout`.

3. **Cuda‑Probe**  
   Minimal `nvidia‑smi` check; if driver ≠ compiled CUDA, WFGY rewrites
   env `CUDA_VISIBLE_DEVICES=""` and logs downgrade.

4. **Prompt Lint**  
   CI step: scans prompts for `{{ }}` or `${}` tokens lacking a default in
   `prompt_vars.yaml`.

---

## ✍️ Demo — Tokenizer Version Skew

```bash
$ wgfy preflight
✔ env vars ............... OK
✖ checkpoint ↔ tokenizer .. MISMATCH
  • model: facebook/llama‑2‑7b‑chat‑hf  tokenizer‑sha = `ad4c1b9`
  • runtime: tokenizer‑sha = `9e7f02d`
  → Aborting deploy (use --force to override)
````

---

## 🗺️ Module Cheat‑Sheet

| Module              | Role                            |
| ------------------- | ------------------------------- |
| **SemVers Diff**    | Catch model / tokenizer skew    |
| **Boot Checkpoint** | Ensure secrets & config exist   |
| **Cuda‑Probe**      | Verify GPU driver compatibility |
| **Prompt Lint**     | Fail CI on stray template vars  |

---

## 📊 Implementation Status

| Feature                  | State    |
| ------------------------ | -------- |
| SemVers diff             | ✅ Stable |
| Boot checkpoint          | ✅ Stable |
| Cuda‑probe fallback      | ⚠️ Beta  |
| Prompt lint in CI action | ✅ Stable |

---

## 📝 Tips & Limits

* Add `ignore_versions: ["minor"]` in `wgfy.yaml` to allow 1‑patch drifts.
* Set `secret_timeout = 90s` for slower vaults.
* GPU fallback adds \~0.4 s latency per request — tune `cuda_probe.mode`.

---

### 🔗 Quick‑Start Downloads (60 sec)

| Tool                       | Link                                                | 3‑Step Setup                                                                      |
| -------------------------- | --------------------------------------------------- | --------------------------------------------------------------------------------- |
| **WFGY 1.0 PDF**           | [Engine Paper](https://zenodo.org/records/15630969) | 1️⃣ Download · 2️⃣ Upload to LLM · 3️⃣ Ask “Answer using WFGY + \<your question>” |
| **TXT OS (plain‑text OS)** | [TXTOS.txt](https://zenodo.org/records/15788557)    | 1️⃣ Download · 2️⃣ Paste in any LLM chat · 3️⃣ Type “hello world” — OS boots      |

---

↩︎ [Back to Problem Index](../README.md)

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<div align="center">

[![WFGY Main](https://img.shields.io/badge/WFGY-Main-red?style=flat-square)](https://github.com/onestardao/WFGY)
 
[![TXT OS](https://img.shields.io/badge/TXT%20OS-Reasoning%20OS-orange?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS)
 
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