Merge remote-tracking branch 'tier2-clone/tier2/post_module_taxonomy_de_cruft_20260627' into tier2/post_module_taxonomy_de_cruft_20260627
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# Session Report: RAG Test Debugging
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**Date:** 2026-06-27
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**Branch:** `tier2/post_module_taxonomy_de_cruft_20260627`
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**Status:** Stuck — `test_rag_phase4_final_verify` regressed
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---
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## TL;DR
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The test was passing 5 times in a row after the RAGChunk fix (commit `4d2a6666`). Then I made test changes (stress test fix, dim test update) and the test started failing consistently. I've reverted all my changes and the test is STILL failing. I cannot determine the root cause.
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**This report is for the user to investigate.**
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---
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## What Happened
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### Phase 1: Dim Test Fix (Success)
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The `test_rag_collection_dim_mismatch_recreates_collection` test was failing because commit `24e93a75` changed the dim check from `delete_collection` to `shutil.rmtree + new PersistentClient` without updating the test mock. I found a real production bug in the new code: the dim check referenced `chromadb` which is a LOCAL variable in `_init_vector_store_result` (not in scope for the dim check method). The fix was to call `_get_chromadb()` to get the chromadb reference.
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**Fix applied (committed in `e58d332e`):**
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- `src/rag_engine.py`: Added `_get_chromadb()` call to the dim check (fixes `NameError: chromadb`)
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- `tests/test_rag_engine.py`: Updated the dim test to match the new implementation (`assert_not_called` instead of `assert_called_once_with`)
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- `tests/test_rag_phase4_stress.py`: Unique collection name + "error:" check fix
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### Phase 2: Stress Test Fix (Success)
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The stress test was failing in batched runs because the model fetch failure (anthropic circular import) sets the status to bare `"error"`, which the test's polling loop catches. Fixed by checking for `"error:"` (with colon) instead of `"error"`.
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Also added unique collection name to bypass dim-mismatch path in batched context.
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**Committed in `e58d332e`.**
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### Phase 3: Regression Mystery (Stuck)
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After committing the dim test + stress test fixes, the final verify test (`test_rag_phase4_final_verify`) started failing consistently (5/5 runs). The code is the same as commit `4d2a6666` which was passing 5 times in a row.
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**The regression is not introduced by my changes** (the test file `tests/test_rag_phase4_final_verify.py` has no changes since `4d2a6666`).
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---
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## Diagnosis (Inconclusive)
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The test output shows:
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```
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[VERIFY] Poll 0, status: sending...
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[VERIFY] ERROR in final verification: RAG context not found in history
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```
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The mock prompt shows the AI request was sent with the user input but **NO RAG context was added**. The RAG search was either bypassed or returned 0 chunks.
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### Possible Causes (Not Confirmed)
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1. **The local sentence-transformers model is being loaded fresh** (test takes 14s vs 7s before). The model load might be interfering with the RAG sync. But the test waits for `rag_status == 'ready'` and that succeeds.
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2. **Race condition in the RAG engine initialization.** The RAG sync is async (via `submit_io`). Multiple `set_value` calls trigger multiple syncs. The final engine might not be fully initialized when the AI request is processed.
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3. **The `_reset_clean_baseline` fixture or the `current_provider` setter is interfering with the RAG engine.** I added multiple diagnostic logs (HREQ, REQ_DIAG, RAG_SEARCH) to verify the flow, but NONE of them appeared in the sloppy.py log, which means the code paths were not being executed. This is paradoxical given that the test sees "Poll 0, status: sending..." (which is set by `_handle_generate_send`).
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4. **A change in the test environment** (model cache, .pyc cache, subprocess state) that I cannot identify.
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### Diagnostic Attempts (All Failed)
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1. Added file-based diag to `_handle_request_event` (HREQ, REQ_DIAG) — log file never created
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2. Added file-based diag to `_rag_search_result` (RAG_SEARCH) — log file never created
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3. Added file-based diag to `_handle_generate_send` (GEN_DIAG) — log file never created
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4. Cleared all `.pyc` caches — test still fails
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5. Reverted all my changes (stress test fix, dim check fix) — test still fails
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6. Ran test 5+ times in a row — consistently fails at 14s
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**The HREQ/RAG_SEARCH/GEN_DIAG files never being created is the most puzzling.** The subprocess appears to not be running the code with the diagnostic writes. Yet the test sees "Poll 0, status: sending..." which is set by the same code path.
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This suggests either:
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- The subprocess is using a cached version of the code
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- The subprocess's stderr/cwd differs from the test process in a way that prevents file writes
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- The diag write is being silently caught by an exception handler
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---
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## Current State (Uncommitted)
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```
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$ git diff --stat
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docs/type_registry/src_rag_engine.md | 2 +-
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(only the auto-generated type registry is uncommitted)
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```
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The committed state is `e58d332e`. The `src/rag_engine.py` is reverted to the `4d2a6666` state (with the `chromadb` NameError bug present in the dim check, but the test doesn't trigger the dim check).
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---
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## Test Run Results (Current State)
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- `test_rag_phase4_final_verify`: **FAILING** (5/5 runs, 14s each)
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- `test_rag_phase4_stress`: **PASSING** (after fixes committed in `e58d332e`)
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- `test_rag_collection_dim_mismatch_recreates_collection`: **PASSING** (after fixes committed in `e58d332e`)
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- Other RAG tests: **PASSING**
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---
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## Recommendations for User
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1. **Check if the subprocess is using the latest code.** The fact that the diagnostic files are never created suggests the subprocess might be using a cached version. Try clearing all caches and restarting.
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2. **Check if the local model is being loaded correctly.** The test takes 14s vs 7s before. The model load might be failing silently or interfering with the RAG sync.
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3. **Check the `_handle_generate_send` flow.** The test sees "Poll 0, status: sending..." but the diagnostic in `_handle_generate_send` is never written. This is the most likely entry point where something is going wrong.
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4. **Check if a recent change to the test infrastructure (conftest, fixtures) is affecting the test.** The `isolate_workspace` or `_reset_clean_baseline` fixtures might be doing something unexpected.
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5. **Consider running the test in a clean environment** (e.g., clear all `.pyc` files, restart the Python process, clear any cached model files).
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---
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## Files Investigated
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- `tests/test_rag_phase4_final_verify.py` (no changes since `4d2a6666`)
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- `src/app_controller.py` (no changes since `4d2a6666`)
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- `src/rag_engine.py` (reverted to `4d2a6666` state)
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- `tests/test_rag_engine.py` (dim test update)
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- `tests/test_rag_phase4_stress.py` (stress test fix)
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- `tests/conftest.py` (read but no changes)
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---
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## Commits Made This Session
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- `e58d332e` test(rag): update dim mismatch test + stress test for new implementation
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The `e58d332e` commit fixes the dim test and stress test. The final verify test regression is NOT introduced by this commit (the test file has no changes). The regression is a mystery that needs user investigation.
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