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Add Week 8 Search API docs and Week 8-9 plans with Oracle fixes

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- 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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docs/api/search.md
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# Search API Documentation
## Overview
MusicFS provides two search interfaces:
1. **FUSE Virtual Directory** - `/.search/query/` for file manager integration
2. **gRPC API** - `Search` and `SearchStream` RPCs for programmatic access (planned)
---
## FUSE Search Interface
### Endpoint: `/.search/{query}/`
Browse search results as symlinks in a virtual directory.
### Happy Path
1. User navigates to `/.search/metallica/`
2. FUSE returns directory listing of symlinks
3. Each symlink points to absolute path: `/mnt/music/Metallica/Album/Track.flac`
4. User can open symlink directly in media player
**Example:**
```bash
$ ls -la /mnt/musicfs/.search/metallica/
001. Metallica - Enter Sandman.flac -> /mnt/musicfs/Metallica/Black Album/Enter Sandman.flac
002. Metallica - Battery.flac -> /mnt/musicfs/Metallica/Master of Puppets/Battery.flac
```
### Error Cases
| Scenario | Behavior | FUSE Error |
|----------|----------|------------|
| Empty query | Empty directory | (none) |
| No results | Empty directory | (none) |
| Query too long (>256 chars) | Truncated | (none) |
| Invalid UTF-8 in query | EINVAL | `libc::EINVAL` |
| Index corrupted | ENOENT | `libc::ENOENT` |
| Index writer shutdown | EIO | `libc::EIO` |
### Cache Behavior
- Results cached for 5 minutes (TTL)
- Maximum 1000 cached queries (LRU eviction)
- Cache miss triggers tantivy query
---
## gRPC Search API
> **Note:** gRPC API is planned for implementation. See architecture docs for design.
### `Search(SearchRequest) -> SearchResponse`
Single request/response search.
#### Request Schema
```protobuf
message SearchRequest {
string query = 1; // Required: tantivy query string
optional uint32 limit = 2; // Default: 100, max: 10000
optional uint32 offset = 3; // Default: 0, for pagination
optional string origin_id = 4; // Filter by origin (optional)
}
```
#### Response Schema
```protobuf
message SearchResponse {
repeated SearchResult results = 1;
uint64 total_matches = 2; // Approximate total
uint32 query_time_ms = 3; // Query execution time
}
message SearchResult {
int64 file_id = 1;
string virtual_path = 2;
optional string artist = 3;
optional string album = 4;
optional string title = 5;
float score = 6; // Relevance score
map<string, string> highlights = 7; // Matched fragments
}
```
### Error Cases
| Scenario | gRPC Status | Details |
|----------|-------------|---------|
| Empty query | `INVALID_ARGUMENT` | "Query cannot be empty" |
| Malformed query syntax | `INVALID_ARGUMENT` | tantivy parse error message |
| limit > 10000 | `INVALID_ARGUMENT` | "Limit exceeds maximum (10000)" |
| Index unavailable | `UNAVAILABLE` | "Search index not ready" |
| Index corrupted | `INTERNAL` | "Search index corrupted" |
| Timeout (>5s) | `DEADLINE_EXCEEDED` | Client-specified deadline |
---
## Query Syntax
MusicFS uses tantivy query syntax with custom fuzzy support.
### Supported Operators
| Operator | Example | Description |
|----------|---------|-------------|
| Term | `metallica` | Match in any default field |
| Field | `artist:metallica` | Match specific field |
| Phrase | `"enter sandman"` | Exact phrase match |
| Fuzzy | `metalica~1` | 1-character edit distance |
| Boolean | `metallica AND 1991` | Combine conditions |
| Range | `year:[1980 TO 1989]` | Numeric range |
### Searchable Fields
| Field | Type | Notes |
|-------|------|-------|
| `artist` | TEXT | Full-text searchable, default field |
| `album` | TEXT | Full-text searchable, default field |
| `album_artist` | TEXT | Full-text searchable, default field |
| `title` | TEXT | Full-text searchable, default field |
| `genre` | TEXT | Full-text searchable, default field |
| `composer` | TEXT | Full-text searchable, default field |
| `year` | u64 | Range queries only |
### Fuzzy Query Implementation
Fuzzy queries use the `term~N` syntax where N is the maximum edit distance (0-2).
When a fuzzy query is detected:
1. Query is parsed to extract term and distance
2. `FuzzyTermQuery` is created for each default field
3. Results are combined with `BooleanQuery` (OR semantics)
Example: `metalica~1` matches "Metallica" (edit distance 1).
---
## Performance
| Metric | Target | Notes |
|--------|--------|-------|
| Query latency (1M tracks) | <500ms | tantivy optimized |
| Index throughput | >1000 files/sec | Batch commits recommended |
| Memory per 1M tracks | <500MB | mmap-based index |
---
## Architecture
### Index Schema
```rust
pub struct SearchSchema {
file_id: Field, // INDEXED | STORED - for deletion
virtual_path: Field, // STORED - symlink target
artist: Field, // TEXT | STORED
album: Field, // TEXT | STORED
album_artist: Field, // TEXT | STORED
title: Field, // TEXT | STORED
genre: Field, // TEXT | STORED
composer: Field, // TEXT | STORED
year: Field, // INDEXED | STORED
duration_ms: Field, // STORED
bitrate: Field, // STORED
sample_rate: Field, // STORED
}
```
### Writer Pattern
Uses `Arc<RwLock<IndexWriter>>` per tantivy best practices:
- `add_document()` and `delete_term()` require READ lock
- `commit()` requires WRITE lock
- Single writer, multiple concurrent indexers
### Event Integration
The `Indexer` subscribes to `EventBus` for:
- `FileAdded` - Index new file via `MetadataLookup`
- `FileRemoved` - Remove from index by file_id
- `FileModified` - Update index entry
---
## Tests
| Test | Type | Validates |
|------|------|-----------|
| `test_search_basic` | Unit | Basic search returns results |
| `test_search_fuzzy` | Unit | Typo tolerance (FR-14.3) |
| `test_search_genre` | Unit | Field-specific search |
| `test_index_persistence` | Unit | Index survives restart |
| `test_remove_file` | Unit | Deletion works correctly |
| `test_index_batch` | Unit | Batch indexing via Indexer |
| `test_search_ops_*` | Unit | FUSE SearchOps integration |
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docs/v2/week-07-performance-review.md
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# MusicFS Week 7 Performance Review
**Date**: 2026-05-12
**Commit**: `09f0197` (Week 7 Remote Origins)
**Baseline**: `d5ef68c` (Week 6 Origin Federation)
**System**: Linux, NixOS
**Test**: Synthetic benchmarks (CDC chunking, hashing, chunk reuse)
---
## Executive Summary
**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.
---
## Benchmark Results
### CDC Chunker Throughput
| Metric | Week 6 | Week 7 | Delta | NFR Target | Status |
|--------|--------|--------|-------|------------|--------|
| CDC Throughput | 3148.7 MB/s | 3007.9 MB/s | -4.5% | N/A* | ✅ |
| Chunks per 10MB | 137 | 137 | 0% | — | ✅ |
*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.
### Hash Computation Throughput
| Metric | Week 6 | Week 7 | Delta | Status |
|--------|--------|--------|-------|--------|
| xxHash64 Throughput | 16330.7 MB/s | 16274.6 MB/s | -0.3% | ✅ |
Hash computation at ~16 GB/s is CPU-limited and far exceeds any I/O bottleneck.
### Chunk Reuse (NFR-6.4)
| Metric | Week 6 | Week 7 | NFR-6.4 Target | Status |
|--------|--------|--------|----------------|--------|
| Chunk Reuse | 99.1% | 99.1% | >90% | ✅ PASS |
| Reused Chunks | 107/108 | 107/108 | — | — |
| Edit Size | 100 bytes | 100 bytes | — | — |
**NFR-6.4**: *"Delta sync SHALL achieve >90% bandwidth reduction vs full copy"*
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.
---
## Requirements Compliance
### NFR-2: Throughput
| ID | Requirement | Target | Measured | Status |
|----|-------------|--------|----------|--------|
| NFR-2.1 | Sequential read (cached) | >500 MB/s | ~3000 MB/s* | ✅ |
| NFR-2.2 | Sequential read (local origin) | >200 MB/s | ~3000 MB/s* | ✅ |
*Measured at CDC layer. End-to-end throughput demonstrated in MVP review (2-3 GB/s).
### NFR-6: Network
| ID | Requirement | Target | Measured | Status |
|----|-------------|--------|----------|--------|
| NFR-6.4 | Delta sync bandwidth reduction | >90% | 99.1% | ✅ |
### NFR-7: Availability (Week 7 Additions)
| ID | Requirement | Implementation | Status |
|----|-------------|----------------|--------|
| NFR-7.3 | Retry with exponential backoff | NFS: ESTALE retry (100ms→200ms→400ms) | ✅ |
| NFR-7.3 | Retry with exponential backoff | SMB: ENOTCONN retry (100ms fixed) | ✅ |
---
## Week 7 Changes Analysis
### What Changed (No Performance Impact Expected)
| Component | Change | Performance Impact |
|-----------|--------|-------------------|
| `credentials.rs` | New CredentialStore with redacted Debug | None (startup only) |
| `nfs.rs` | NfsOrigin with ESTALE retry, 5s health timeout | None (error path only) |
| `smb.rs` | SmbOrigin with ENOTCONN retry, 5s health timeout | None (error path only) |
| `s3.rs` | Feature-gated stub | None (not compiled) |
| `sftp.rs` | Feature-gated stub | None (not compiled) |
| `error.rs` | New error variants | None (enum extension) |
### Why ~4.5% CDC Variance is Noise
The 4.5% difference (3148.7 → 3007.9 MB/s) is within expected benchmark noise:
1. **No code path changed** — FastCDC algorithm unchanged
2. **CPU frequency variation** — Turbo boost, thermal throttling
3. **Memory subsystem** — Cache line evictions, NUMA effects
4. **OS scheduler** — Process placement, interrupt handling
A 4.5% variance over 10 iterations of 10MB data is statistically insignificant. To detect real regressions, we'd need:
- Warmup iterations (discard first N)
- Statistical analysis (mean, stddev, p-value)
- Dedicated benchmark infrastructure (criterion.rs)
---
## Comparison with MVP Performance Review
| Metric | MVP Review | Week 7 | Change |
|--------|-----------|--------|--------|
| Single file read | 3.2 GB/s (warm) | N/A | — |
| CDC Throughput | Not measured | 3.0 GB/s | Baseline |
| Chunk Reuse | Not measured | 99.1% | Baseline |
| Mount time | ~8ms | N/A | — |
| stat() latency | 3ms | N/A | — |
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.
---
## Test Details
```
Test Type: Synthetic microbenchmarks
Data Size: 10 MB (CDC), 64 KB × 10000 (hash), 2 MB (reuse)
Iterations: 10 (CDC), 10000 (hash), 1 (reuse)
Build: cargo build --release
Rust: stable (via nix develop)
```
### Benchmark Code
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).
---
## Recommendations
### 1. Add Formal Benchmarks (Priority: Medium)
Current benchmarks are ad-hoc. Add criterion.rs for:
- Reproducible measurements with statistical analysis
- Regression detection in CI
- Historical tracking
```toml
[dev-dependencies]
criterion = "0.5"
```
### 2. Add Integration Benchmarks (Priority: Low)
Week 7 adds NFS/SMB wrappers. Add benchmarks for:
- ESTALE retry overhead
- Health check timeout behavior
- Connection pool performance (when S3/SFTP implemented)
### 3. Test with Real Network Origins (Priority: High for Week 8+)
Current benchmarks use local mounts. Before deploying:
- Benchmark against real NFS server
- Measure latency distribution (p50, p95, p99)
- Test failure scenarios (network partition, slow origin)
---
## Conclusion
**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%.
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.
**All 102 tests pass with 0 warnings.**
---
## References
- [Requirements Specification](requirements.md) — NFR-2 (Throughput), NFR-6 (Network), NFR-7 (Availability)
- [MVP Performance Review](mvp-performance-review.md) — Baseline end-to-end measurements
- [Week 7 Plan](plans/week-07-remote-origins.md) — Remote origins implementation