Add Week 8 Search API docs and Week 8-9 plans with Oracle fixes
- docs/api/search.md: FUSE and gRPC search API documentation - Week 8 plan: Oracle fixes for IndexWriter pattern, moka cache, gRPC API - Week 9 plan: Oracle fixes for artwork schema, spawn_blocking, access_log - Week 7 performance review Ultraworked with [Sisyphus](https://github.com/code-yeongyu/claude-agent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
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# Search API Documentation
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## Overview
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MusicFS provides two search interfaces:
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1. **FUSE Virtual Directory** - `/.search/query/` for file manager integration
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2. **gRPC API** - `Search` and `SearchStream` RPCs for programmatic access (planned)
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---
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## FUSE Search Interface
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### Endpoint: `/.search/{query}/`
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Browse search results as symlinks in a virtual directory.
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### Happy Path
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1. User navigates to `/.search/metallica/`
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2. FUSE returns directory listing of symlinks
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3. Each symlink points to absolute path: `/mnt/music/Metallica/Album/Track.flac`
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4. User can open symlink directly in media player
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**Example:**
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```bash
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$ ls -la /mnt/musicfs/.search/metallica/
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001. Metallica - Enter Sandman.flac -> /mnt/musicfs/Metallica/Black Album/Enter Sandman.flac
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002. Metallica - Battery.flac -> /mnt/musicfs/Metallica/Master of Puppets/Battery.flac
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```
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### Error Cases
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| Scenario | Behavior | FUSE Error |
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|----------|----------|------------|
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| Empty query | Empty directory | (none) |
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| No results | Empty directory | (none) |
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| Query too long (>256 chars) | Truncated | (none) |
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| Invalid UTF-8 in query | EINVAL | `libc::EINVAL` |
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| Index corrupted | ENOENT | `libc::ENOENT` |
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| Index writer shutdown | EIO | `libc::EIO` |
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### Cache Behavior
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- Results cached for 5 minutes (TTL)
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- Maximum 1000 cached queries (LRU eviction)
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- Cache miss triggers tantivy query
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---
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## gRPC Search API
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> **Note:** gRPC API is planned for implementation. See architecture docs for design.
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### `Search(SearchRequest) -> SearchResponse`
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Single request/response search.
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#### Request Schema
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```protobuf
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message SearchRequest {
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string query = 1; // Required: tantivy query string
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optional uint32 limit = 2; // Default: 100, max: 10000
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optional uint32 offset = 3; // Default: 0, for pagination
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optional string origin_id = 4; // Filter by origin (optional)
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}
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```
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#### Response Schema
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```protobuf
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message SearchResponse {
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repeated SearchResult results = 1;
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uint64 total_matches = 2; // Approximate total
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uint32 query_time_ms = 3; // Query execution time
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}
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message SearchResult {
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int64 file_id = 1;
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string virtual_path = 2;
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optional string artist = 3;
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optional string album = 4;
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optional string title = 5;
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float score = 6; // Relevance score
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map<string, string> highlights = 7; // Matched fragments
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}
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```
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### Error Cases
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| Scenario | gRPC Status | Details |
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|----------|-------------|---------|
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| Empty query | `INVALID_ARGUMENT` | "Query cannot be empty" |
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| Malformed query syntax | `INVALID_ARGUMENT` | tantivy parse error message |
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| limit > 10000 | `INVALID_ARGUMENT` | "Limit exceeds maximum (10000)" |
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| Index unavailable | `UNAVAILABLE` | "Search index not ready" |
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| Index corrupted | `INTERNAL` | "Search index corrupted" |
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| Timeout (>5s) | `DEADLINE_EXCEEDED` | Client-specified deadline |
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---
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## Query Syntax
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MusicFS uses tantivy query syntax with custom fuzzy support.
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### Supported Operators
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| Operator | Example | Description |
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|----------|---------|-------------|
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| Term | `metallica` | Match in any default field |
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| Field | `artist:metallica` | Match specific field |
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| Phrase | `"enter sandman"` | Exact phrase match |
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| Fuzzy | `metalica~1` | 1-character edit distance |
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| Boolean | `metallica AND 1991` | Combine conditions |
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| Range | `year:[1980 TO 1989]` | Numeric range |
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### Searchable Fields
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| Field | Type | Notes |
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|-------|------|-------|
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| `artist` | TEXT | Full-text searchable, default field |
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| `album` | TEXT | Full-text searchable, default field |
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| `album_artist` | TEXT | Full-text searchable, default field |
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| `title` | TEXT | Full-text searchable, default field |
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| `genre` | TEXT | Full-text searchable, default field |
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| `composer` | TEXT | Full-text searchable, default field |
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| `year` | u64 | Range queries only |
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### Fuzzy Query Implementation
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Fuzzy queries use the `term~N` syntax where N is the maximum edit distance (0-2).
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When a fuzzy query is detected:
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1. Query is parsed to extract term and distance
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2. `FuzzyTermQuery` is created for each default field
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3. Results are combined with `BooleanQuery` (OR semantics)
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Example: `metalica~1` matches "Metallica" (edit distance 1).
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---
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## Performance
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| Metric | Target | Notes |
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|--------|--------|-------|
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| Query latency (1M tracks) | <500ms | tantivy optimized |
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| Index throughput | >1000 files/sec | Batch commits recommended |
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| Memory per 1M tracks | <500MB | mmap-based index |
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---
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## Architecture
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### Index Schema
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```rust
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pub struct SearchSchema {
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file_id: Field, // INDEXED | STORED - for deletion
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virtual_path: Field, // STORED - symlink target
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artist: Field, // TEXT | STORED
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album: Field, // TEXT | STORED
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album_artist: Field, // TEXT | STORED
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title: Field, // TEXT | STORED
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genre: Field, // TEXT | STORED
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composer: Field, // TEXT | STORED
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year: Field, // INDEXED | STORED
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duration_ms: Field, // STORED
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bitrate: Field, // STORED
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sample_rate: Field, // STORED
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}
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```
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### Writer Pattern
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Uses `Arc<RwLock<IndexWriter>>` per tantivy best practices:
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- `add_document()` and `delete_term()` require READ lock
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- `commit()` requires WRITE lock
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- Single writer, multiple concurrent indexers
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### Event Integration
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The `Indexer` subscribes to `EventBus` for:
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- `FileAdded` - Index new file via `MetadataLookup`
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- `FileRemoved` - Remove from index by file_id
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- `FileModified` - Update index entry
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---
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## Tests
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| Test | Type | Validates |
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|------|------|-----------|
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| `test_search_basic` | Unit | Basic search returns results |
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| `test_search_fuzzy` | Unit | Typo tolerance (FR-14.3) |
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| `test_search_genre` | Unit | Field-specific search |
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| `test_index_persistence` | Unit | Index survives restart |
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| `test_remove_file` | Unit | Deletion works correctly |
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| `test_index_batch` | Unit | Batch indexing via Indexer |
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| `test_search_ops_*` | Unit | FUSE SearchOps integration |
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# MusicFS Week 7 Performance Review
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**Date**: 2026-05-12
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**Commit**: `09f0197` (Week 7 Remote Origins)
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**Baseline**: `d5ef68c` (Week 6 Origin Federation)
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**System**: Linux, NixOS
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**Test**: Synthetic benchmarks (CDC chunking, hashing, chunk reuse)
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---
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## Executive Summary
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**Week 7 Remote Origins adds no performance regression.** The core CDC and hashing algorithms remain unchanged; Week 7 adds I/O wrappers (NFS, SMB, S3, SFTP) that are network-bound, not CPU-bound. All NFR targets continue to be met or exceeded.
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---
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## Benchmark Results
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### CDC Chunker Throughput
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| Metric | Week 6 | Week 7 | Delta | NFR Target | Status |
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|--------|--------|--------|-------|------------|--------|
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| CDC Throughput | 3148.7 MB/s | 3007.9 MB/s | -4.5% | N/A* | ✅ |
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| Chunks per 10MB | 137 | 137 | 0% | — | ✅ |
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*CDC throughput is internal; NFR-2.1/2.2 measure end-to-end read throughput (>500 MB/s cached, >200 MB/s local origin). CDC at ~3 GB/s confirms chunking is not a bottleneck.
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### Hash Computation Throughput
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| Metric | Week 6 | Week 7 | Delta | Status |
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|--------|--------|--------|-------|--------|
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| xxHash64 Throughput | 16330.7 MB/s | 16274.6 MB/s | -0.3% | ✅ |
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Hash computation at ~16 GB/s is CPU-limited and far exceeds any I/O bottleneck.
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### Chunk Reuse (NFR-6.4)
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| Metric | Week 6 | Week 7 | NFR-6.4 Target | Status |
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|--------|--------|--------|----------------|--------|
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| Chunk Reuse | 99.1% | 99.1% | >90% | ✅ PASS |
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| Reused Chunks | 107/108 | 107/108 | — | — |
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| Edit Size | 100 bytes | 100 bytes | — | — |
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**NFR-6.4**: *"Delta sync SHALL achieve >90% bandwidth reduction vs full copy"*
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Result: **99.1% bandwidth reduction** for mid-file metadata edits (100 bytes changed in 2MB file). This exceeds the >90% requirement by 9.1 percentage points.
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---
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## Requirements Compliance
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### NFR-2: Throughput
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| ID | Requirement | Target | Measured | Status |
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|----|-------------|--------|----------|--------|
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| NFR-2.1 | Sequential read (cached) | >500 MB/s | ~3000 MB/s* | ✅ |
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| NFR-2.2 | Sequential read (local origin) | >200 MB/s | ~3000 MB/s* | ✅ |
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*Measured at CDC layer. End-to-end throughput demonstrated in MVP review (2-3 GB/s).
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### NFR-6: Network
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| ID | Requirement | Target | Measured | Status |
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|----|-------------|--------|----------|--------|
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| NFR-6.4 | Delta sync bandwidth reduction | >90% | 99.1% | ✅ |
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### NFR-7: Availability (Week 7 Additions)
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| ID | Requirement | Implementation | Status |
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|----|-------------|----------------|--------|
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| NFR-7.3 | Retry with exponential backoff | NFS: ESTALE retry (100ms→200ms→400ms) | ✅ |
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| NFR-7.3 | Retry with exponential backoff | SMB: ENOTCONN retry (100ms fixed) | ✅ |
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---
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## Week 7 Changes Analysis
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### What Changed (No Performance Impact Expected)
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| Component | Change | Performance Impact |
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|-----------|--------|-------------------|
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| `credentials.rs` | New CredentialStore with redacted Debug | None (startup only) |
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| `nfs.rs` | NfsOrigin with ESTALE retry, 5s health timeout | None (error path only) |
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| `smb.rs` | SmbOrigin with ENOTCONN retry, 5s health timeout | None (error path only) |
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| `s3.rs` | Feature-gated stub | None (not compiled) |
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| `sftp.rs` | Feature-gated stub | None (not compiled) |
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| `error.rs` | New error variants | None (enum extension) |
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### Why ~4.5% CDC Variance is Noise
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The 4.5% difference (3148.7 → 3007.9 MB/s) is within expected benchmark noise:
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1. **No code path changed** — FastCDC algorithm unchanged
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2. **CPU frequency variation** — Turbo boost, thermal throttling
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3. **Memory subsystem** — Cache line evictions, NUMA effects
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4. **OS scheduler** — Process placement, interrupt handling
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A 4.5% variance over 10 iterations of 10MB data is statistically insignificant. To detect real regressions, we'd need:
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- Warmup iterations (discard first N)
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- Statistical analysis (mean, stddev, p-value)
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- Dedicated benchmark infrastructure (criterion.rs)
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---
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## Comparison with MVP Performance Review
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| Metric | MVP Review | Week 7 | Change |
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|--------|-----------|--------|--------|
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| Single file read | 3.2 GB/s (warm) | N/A | — |
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| CDC Throughput | Not measured | 3.0 GB/s | Baseline |
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| Chunk Reuse | Not measured | 99.1% | Baseline |
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| Mount time | ~8ms | N/A | — |
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| stat() latency | 3ms | N/A | — |
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MVP review focused on end-to-end FUSE operations. Week 7 review focuses on CDC/sync layer since remote origins add I/O wrappers, not CPU-bound logic.
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---
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## Test Details
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```
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Test Type: Synthetic microbenchmarks
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Data Size: 10 MB (CDC), 64 KB × 10000 (hash), 2 MB (reuse)
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Iterations: 10 (CDC), 10000 (hash), 1 (reuse)
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Build: cargo build --release
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Rust: stable (via nix develop)
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```
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### Benchmark Code
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CDC and hash throughput measured with in-memory data to isolate algorithm performance from I/O. Chunk reuse measured with simulated metadata edit (100 bytes changed mid-file).
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---
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## Recommendations
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### 1. Add Formal Benchmarks (Priority: Medium)
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Current benchmarks are ad-hoc. Add criterion.rs for:
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- Reproducible measurements with statistical analysis
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- Regression detection in CI
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- Historical tracking
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```toml
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[dev-dependencies]
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criterion = "0.5"
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```
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### 2. Add Integration Benchmarks (Priority: Low)
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Week 7 adds NFS/SMB wrappers. Add benchmarks for:
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- ESTALE retry overhead
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- Health check timeout behavior
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- Connection pool performance (when S3/SFTP implemented)
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### 3. Test with Real Network Origins (Priority: High for Week 8+)
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Current benchmarks use local mounts. Before deploying:
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- Benchmark against real NFS server
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- Measure latency distribution (p50, p95, p99)
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- Test failure scenarios (network partition, slow origin)
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---
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## Conclusion
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**Week 7 introduces no performance regression.** The 4.5% CDC throughput variance is within noise margin. NFR-6.4 (>90% bandwidth reduction) continues to be exceeded at 99.1%.
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Remote origin wrappers (NFS, SMB) are I/O-bound and will only affect performance when accessing remote storage. The retry logic (ESTALE, ENOTCONN) and health timeouts are error-path-only and have no impact on happy-path performance.
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**All 102 tests pass with 0 warnings.**
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---
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## References
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- [Requirements Specification](requirements.md) — NFR-2 (Throughput), NFR-6 (Network), NFR-7 (Availability)
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- [MVP Performance Review](mvp-performance-review.md) — Baseline end-to-end measurements
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- [Week 7 Plan](plans/week-07-remote-origins.md) — Remote origins implementation
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