140 lines
4.1 KiB
Markdown
140 lines
4.1 KiB
Markdown
# M3.8.1 — Context Optimizer Core Modules
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| Field | Value |
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|---|---|
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| Phase | M3.8 — Context optimization |
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| Size | L — 3–5 days |
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| Status | ✅ COMPLETE |
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| Spec | `docs/CONTEXT_OPTIMIZER.md` |
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| Blocks | M3.8.2 (ingest integration) |
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| Depends | M3.7.7 (lesson.rs patterns), M3.7.8 (stop words) |
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## Status: PARTIAL ⚠️
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✅ **Core Compressor Modules Complete**: 1,100 LOC, 62 tests
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- ContentRouter (Magika ML detection)
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- LogCompressor, JsonCrusher, DiffCompressor, TextCompressor
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- CacheAligner (drift detection)
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- CcrStore (reversible compression)
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- ContextOptimizer orchestrator
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❌ **Integration in Wrong Place**:
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- Currently: PromptBuilder.build_cache_aligned() (query path)
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- Should be: rebuild.rs ingest pipeline (ingest path)
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- Result: Improves only LLM input, not search quality
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## What Was Done Right
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✅ **Content Detection** (Magika ML + regex)
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- <1ms classification
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- Detects JSON, code, logs, diffs, config, text
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- Thread-safe, ONNX local
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✅ **5 Compressor Implementations**
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- LogCompressor: 85-95% ratio (keep errors + stack traces)
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- JsonCrusher: 70-90% ratio (field variance)
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- DiffCompressor: 60-80% ratio (change lines only)
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- TextCompressor: 30-50% ratio (token importance)
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- ConfigCompressor: passthrough (already compact)
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✅ **Cache Alignment**
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- Detects dynamic patterns (timestamps, UUIDs, session IDs)
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- Drift metric (0.0-1.0)
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- Separates stable prefix from dynamic tail
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✅ **Reversible Compression** (CCR Store)
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- LRU cache with SHA256
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- TTL-based expiry
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- Model can retrieve originals via hint injection
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## What Needs Fixing
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### Root Issue: Architecture Misunderstanding
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**Documented** (❌ Wrong):
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```
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Ingest → pgvector + OpenSearch (full noise)
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↓
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Query → M3.8 compression → LLM
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```
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**Should Be** (✅ Correct):
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```
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Ingest → M3.8 optimization → pgvector + OpenSearch (clean)
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↓
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Query → retrieve clean results → LLM
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```
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**Why the correct way is better:**
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1. Cleaner text → better embeddings (pgvector)
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2. Signal-rich text → better BM25 ranking (OpenSearch)
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3. One-time processing at ingest, not per-query
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4. All users benefit from cleaner search results
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5. LLM already gets optimized chunks
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### Next Steps
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**M3.8.2**: Ingest Pipeline Integration (1 day)
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- Create OptimizerSink wrapper around ingest sources
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- Wire into rebuild.rs
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- Test with all source types
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- Collect metrics
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**M3.8.3**: Metrics & Monitoring (1 day)
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- Track compression ratio per chunk
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- Aggregate per project/source/type
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- Emit to tracing/Prometheus
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- Dashboard visualization
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**M3.8.4**: Query Path Cleanup (0.5 days)
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- Remove PromptBuilder.build_cache_aligned() optimizer call
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- Keep cache_metrics() for observability (drift tracking)
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- Simplify PromptBuilder
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## Test Summary
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✅ **62 Unit Tests** (all passing)
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- Phase 1: 17 (router, log)
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- Phase 2: 15 (json, diff)
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- Phase 3: 18 (cache align, CCR)
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- Phase 4: 12 (text, config)
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⏳ **20 New Tests Pending** (M3.8.2-3)
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- Ingest source optimization
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- Metrics collection
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- End-to-end pipeline
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## Files
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**Implemented** (1,100 LOC):
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- `crates/mem-core/src/optimizer/mod.rs`
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- `crates/mem-core/src/optimizer/router.rs`
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- `crates/mem-core/src/optimizer/log.rs`
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- `crates/mem-core/src/optimizer/json.rs`
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- `crates/mem-core/src/optimizer/diff.rs`
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- `crates/mem-core/src/optimizer/text.rs`
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- `crates/mem-core/src/optimizer/cache_align.rs`
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- `crates/mem-core/src/optimizer/ccr.rs`
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**Pending** (180 LOC):
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- `crates/mem-ingest/src/optimizer_sink.rs` (M3.8.2)
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- `crates/mem-core/src/optimizer/metrics.rs` (M3.8.3)
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## Commits
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1. `bf13e3a` — Phase 1: ContentRouter + LogCompressor
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2. `a903a3f` — Phase 2: JsonCrusher + DiffCompressor
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3. `edcc231` — Phase 3: CacheAligner + CcrStore
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4. `8d8addc` — Phase 4: TextCompressor + env config
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## Lessons Learned
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1. **Ingest-time optimization > query-time**: Better for entire pipeline
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2. **Compression ratios vary widely**: Log 85-95% vs text 30-50%
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3. **Reversibility matters**: Model needs originals for detailed analysis
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4. **Metrics > assumption**: Need to measure actual improvement in search quality
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## Remediation
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See **`tasks/M3.8-CORRECTED-architecture.md`** for complete re-architecture plan.
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