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David Snelling 0bcf50a442 fix: resolve HNSW concurrency race condition across all storage adapters 
Fixes critical P0 bug causing data corruption during bulk imports with 50+ concurrent operations. The non-atomic read-modify-write pattern in saveHNSWData() combined with fire-and-forget neighbor updates was causing 16-32 concurrent writes per entity, resulting in lost HNSW connections and corrupted graph structure.

**Root Cause:**
- saveHNSWData() used non-atomic read-modify-write
- HNSW neighbor updates fired without await (16-32 concurrent writes/entity)
- Popular nodes became hotspots (100 concurrent imports = 3,400 concurrent saveHNSWData calls)
- Result: Lost neighbor connections, 0 search results

**Atomic Write Strategies by Adapter:**

FileSystemStorage:
- Atomic rename with temp files
- Write to {file}.tmp.{timestamp}.{random}
- POSIX-guaranteed atomic rename(temp, final)

GCSStorage:
- Optimistic locking with generation numbers
- preconditionOpts: { ifGenerationMatch }
- 5 retries with exponential backoff (50ms→800ms)

S3/R2/AzureStorage:
- ETag-based optimistic locking
- IfMatch/conditions preconditions
- 5 retries with exponential backoff

MemoryStorage + OPFSStorage:
- Mutex locks per entity path
- Serializes async operations even in single-threaded environments

HNSW Index:
- Changed fire-and-forget .catch() to await
- Serializes 16-32 neighbor updates per entity
- Trade-off: 20-30% slower bulk import vs 100% data integrity

**Sharding Compatibility:**
- ✅ Works with deterministic UUID sharding (256 shards, always on)
- ✅ Works with distributed multi-node sharding (optional)
- ✅ All atomic strategies work in both single-node and distributed deployments

**Index Impact:**
- Only HNSW index modified (saveHNSWData, saveHNSWSystem)
- Other 4 indexes unaffected (Metadata, Graph Adjacency, Deleted Items, Entity ID Mapper)
- No regression risk - isolated code paths

**Testing:**
- 8/8 unit tests passing (real concurrent operations, no mocks)
- Tests verify data integrity after 20 concurrent updates
- Tests verify temp file cleanup and mutex serialization

**Files Modified:**
- All 8 storage adapters (FileSystem, GCS, S3, R2, Azure, Memory, OPFS)
- HNSW Index (neighbor update serialization)
- New test: tests/unit/storage/hnswConcurrency.test.ts (8 passing tests)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
2025-10-29 15:24:20 -07:00
..
api feat: Brainy 3.0 - Production-ready Triple Intelligence database 2025-09-11 16:23:32 -07:00
augmentations/intelligentImport feat: add intelligent import for CSV, Excel, and PDF files 2025-10-01 16:51:03 -07:00
benchmarks feat: remove legacy ImportManager, standardize getStats() API 2025-10-09 11:40:31 -07:00
comprehensive fix: resolve 10 test failures across clustering, metadata, and deletion 2025-10-09 16:33:08 -07:00
configs 🧠 Brainy 2.0.0 - Zero-Configuration AI Database with Triple Intelligence™ 2025-08-26 12:32:21 -07:00
fixtures/import feat: add intelligent import for CSV, Excel, and PDF files 2025-10-01 16:51:03 -07:00
helpers feat: Brainy 3.0 - Triple Intelligence Release 2025-09-15 11:06:16 -07:00
integration test: comprehensive tests for remaining APIs (17/17 passing) 2025-10-24 12:59:41 -07:00
manual test: add comprehensive API verification tests (21/25 passing) 2025-10-24 12:09:42 -07:00
performance docs: remove exaggerated performance claims and add honest benchmarks 2025-10-28 09:54:01 -07:00
scripts feat: Brainy 3.0 - Production-ready Triple Intelligence database 2025-09-11 16:23:32 -07:00
unit fix: resolve HNSW concurrency race condition across all storage adapters 2025-10-29 15:24:20 -07:00
vfs fix: resolve 10 test failures across clustering, metadata, and deletion 2025-10-09 16:33:08 -07:00
brainy-3.test.ts fix: resolve 10 test failures across clustering, metadata, and deletion 2025-10-09 16:33:08 -07:00
critical-error-handling.test.ts feat: Brainy 3.0 - Production-ready Triple Intelligence database 2025-09-11 16:23:32 -07:00
critical-neural-validation.test.ts feat: Brainy 3.0 - Production-ready Triple Intelligence database 2025-09-11 16:23:32 -07:00
critical-performance-benchmark.test.ts feat: Brainy 3.0 - Production-ready Triple Intelligence database 2025-09-11 16:23:32 -07:00
distributed-demo.test.ts feat: Brainy 3.0 - Production-ready Triple Intelligence database 2025-09-11 16:23:32 -07:00
model-loading.test.ts 🧠 Brainy 2.0.0 - Zero-Configuration AI Database with Triple Intelligence™ 2025-08-26 12:32:21 -07:00
opfs-storage.test.ts 🧠 Brainy 2.0.0 - Zero-Configuration AI Database with Triple Intelligence™ 2025-08-26 12:32:21 -07:00
package-size-breakdown.test.ts 🧠 Brainy 2.0.0 - Zero-Configuration AI Database with Triple Intelligence™ 2025-08-26 12:32:21 -07:00
package-size-limit.test.ts 🧠 Brainy 2.0.0 - Zero-Configuration AI Database with Triple Intelligence™ 2025-08-26 12:32:21 -07:00
setup-integration.ts 🧠 Brainy 2.0.0 - Zero-Configuration AI Database with Triple Intelligence™ 2025-08-26 12:32:21 -07:00
setup-unit.ts 🧠 Brainy 2.0.0 - Zero-Configuration AI Database with Triple Intelligence™ 2025-08-26 12:32:21 -07:00
setup.ts 🧠 Brainy 2.0.0 - Zero-Configuration AI Database with Triple Intelligence™ 2025-08-26 12:32:21 -07:00
streaming-pipeline.test.ts feat: Brainy 3.0 - Production-ready Triple Intelligence database 2025-09-11 16:23:32 -07:00
type-utils.test.ts 🧠 Brainy 2.0.0 - Zero-Configuration AI Database with Triple Intelligence™ 2025-08-26 12:32:21 -07:00
typeAwareHNSWIndex.test.ts feat: Phase 2 Type-Aware HNSW - 87% memory reduction @ billion scale 2025-10-15 15:39:28 -07:00
typeAwareQueryPlanner.test.ts feat: Phase 3 - Unified Semantic Type Inference (Nouns + Verbs) 2025-10-16 10:59:26 -07:00