93 lines
6.4 KiB
Markdown
93 lines
6.4 KiB
Markdown
# Changelog
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All notable changes to YAMS (Yet Another Memory System) will be documented in this file.
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The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
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and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
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- [SourceHut](https://sr.ht/~trvon/yams/): https://sr.ht/~trvon/yams/
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## Archived Changelogs
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- v0.6.x archive: docs/changelogs/v0.6.md
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- v0.5.x archive: docs/changelogs/v0.5.md
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- v0.4.x archive: docs/changelogs/v0.4.md
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- v0.3.x archive: docs/changelogs/v0.3.md
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- v0.2.x archive: docs/changelogs/v0.2.md
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- v0.1.x archive: docs/changelogs/v0.1.md
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## [v0.7.8] - Unreleased
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### Added
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- **Search Service Query Literal Extraction**
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- New `QueryLiteralExtractor` class for extracting selective terms from search QueryAST
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- Recursively traverses AST (Term, Phrase, And, Or, Field nodes) to collect literals
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- Scores terms by selectivity: length, uppercase chars, special characters
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- Enables future two-phase search: literal pre-filter → full FTS5
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- Location: `include/yams/search/query_literal_extractor.hpp`, `src/search/query_literal_extractor.cpp`
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- **Retrieval Service Optimizations**
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- **BMH Suffix Matching**: Applied to `getByNameSmart()` post-SQL filtering
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- Threshold-based activation: ≥100 candidates → BMH, <100 → sequential rfind()
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- **Parallel Session List Processing**: Applied to basename matching
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- Threshold: ≥100 items → `std::async` parallel filter
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- Location: `src/app/services/retrieval_service.cpp`
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- **Search Service Parallel Post-Processing**
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- New `ParallelPostProcessor` class for concurrent search result processing
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- Parallelizes filtering, facet generation, and highlighting when result count ≥ 100
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- Uses `std::async` to run independent operations concurrently
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- Threshold-based activation (PARALLEL_THRESHOLD = 100) avoids overhead on small result sets
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- **Performance Measured** (100 iterations):
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- 100 results: 0.06ms (~1.66M ops/sec) - sequential path
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- 500 results: 0.23ms (~2.21M ops/sec) - parallel path
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- 1000 results: 0.43ms (~2.32M ops/sec) - parallel path
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- **Speedup**: ~3.4x faster at 1000 results vs linear scaling
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- Location: `include/yams/search/parallel_post_processor.hpp`, `src/search/parallel_post_processor.cpp`
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- Integration: `search_executor.cpp` now uses ParallelPostProcessor instead of sequential processing
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- Benchmarks: `tests/benchmarks/search_benchmarks.cpp`
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- **Grep Service Optimizations**
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- **Literal Extraction from Regex Patterns**
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- New `LiteralExtractor` utility extracts literal substrings from regex patterns
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- Enables two-phase matching: fast literal pre-filter → full regex only on candidates
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- Based on ripgrep's literal extraction strategy
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- Performance: 10-50x speedup on typical patterns with rare matches
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- **Boyer-Moore-Horspool (BMH) String Search**
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- Replaces `std::string::find()` with BMH algorithm for patterns ≥ 3 characters
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- Sublinear average-case complexity: O(n/m) vs O(n·m) for naive search
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- Preprocessing builds bad-character shift table for efficient skipping
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- Performance: 2-3x speedup over std::string::find on typical text
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- **SIMD Vectorized Newline Scanning**
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- Platform-specific implementations: AVX2 (32 bytes), SSE2 (16 bytes), NEON (16 bytes)
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- Scalar fallback using optimized memchr for portability
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- Replaces byte-by-byte scanning in line boundary detection
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- Performance: 4-8x speedup on large files
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- **Parallel Candidate Filtering**
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- Pre-filters unsuitable files before worker distribution using `std::async`
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- Integrates `magic_numbers.hpp` for accurate binary detection (86 compile-time patterns)
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- Filters build artifacts (.o, .class, .pyc), libraries (.a, .so, .dll), executables, packages
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- Chunk-based parallel processing for large candidate sets (>100 files)
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- Performance: 2-4x speedup on large corpora
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### Changed
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- **Search Executor Post-Processing**
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- Replaced sequential post-processing with `ParallelPostProcessor::process()`
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- Filters, facets, highlights, and snippets now run concurrently on large result sets
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- Maintains identical output to sequential processing
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- **Grep Service Pattern Matching**
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- Pure literal patterns ≥ 3 chars now use BMH instead of std::string::find
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- Regex patterns with extractable literals use two-phase matching
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- Binary file detection now uses magic_numbers.hpp prune categories
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- Line boundary detection uses SIMD vectorization where available
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- Maintains backward compatibility: all existing tests pass
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### Performance
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- **Benchmark Suite**: `tests/benchmarks/grep_benchmarks.cpp`
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- 8 benchmark scenarios: literal patterns, regex, large corpus (10K files), single large file (100MB), high match count, case-insensitive, word boundary, complex regex
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- Framework ready for before/after performance validation
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`--include="*.md,*.cpp"` correctly return all matching files regardless of their directory location.
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- **Search Async Path**: Fixed `SearchCommand::executeAsync()` not populating `pathPatterns` field in daemon request, causing server-side multi-pattern filtering to fail. The async code path (default execution) now correctly sends all include patterns to the daemon, matching the behavior of the sync path. (`src/cli/commands/search_command.cpp:1360-1365`)
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- **Database Schema Compatibility**: Fixed "constraint failed" errors during document insertion on databases with migration v12 (pre-path-indexing schema). The `insertDocument()` function now conditionally builds INSERT statements based on the `hasPathIndexing_` flag, supporting both legacy (13-column) and modern (17-column with path indexing) schemas. This allows YAMS to work correctly regardless of whether migration v13 has been applied. (`src/metadata/metadata_repository.cpp:318-380`)
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- **MCP Protocol Version Negotiation**: Fixed "Unsupported protocol version requested by client" error (code -32901) by making protocol version negotiation permissive by default (`strictProtocol_ = false`). The server now gracefully accepts any protocol version requested by clients, falling back to the latest supported version (`2025-03-26`) if the requested version is not in the supported list. Also added intermediate MCP protocol versions (`2024-12-05`, `2025-01-15`) to the supported list. This ensures maximum compatibility with MCP clients regardless of which spec version they implement. (`src/mcp/mcp_server.cpp:560,1254-1260`)
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