feat(p2p): add Kubernetes Lease-based P2P coordination#478
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feat(p2p): add Kubernetes Lease-based P2P coordination#478
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Add BitTorrent library dependency (anacrolix/torrent) and define constants for P2P model distribution: - Lease coordination constants (prefix, labels, durations) - Default configuration values (ports, rates, timeouts) - Environment variable keys for P2P configuration
Introduce the P2P distributor package with: - Config struct with validation and defaults - ConfigFromEnv for environment-based configuration - Comprehensive Prometheus metrics for P2P operations - Download metrics (total, duration, failures) - Peer discovery and connection metrics - Lease and seeding metrics - Metainfo server metrics
Implement ModelDistributor for P2P model distribution: - BitTorrent client management with rate limiting - Peer discovery via Kubernetes headless service DNS - Metainfo fetching from peers for torrent coordination - Model seeding and download operations - Active torrent tracking with proper cleanup Fix API compatibility with anacrolix/torrent v1.57.1: - Use bencode.Marshal instead of info.MarshalBencode - Use t.Complete().Bool() instead of t.Complete.Bool - Handle PeerRemoteAddr type assertion for peer addresses
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Implement MetainfoServer to enable peers to discover available models:
- GET /metainfo/{modelHash} - serve torrent metainfo
- GET /health - health check endpoint
- GET /stats - P2P distribution statistics
- GET /models - list available models with seeding status
- Graceful shutdown support
Fix API compatibility with anacrolix/torrent v1.57.1:
- Add exists() helper function
- Use bencode.Marshal instead of info.MarshalBencode
Add comprehensive tests for the distributor package: - Config validation tests (valid, missing fields, invalid ports) - ConfigWithDefaults tests - Metrics recording tests - Stats struct tests - Test helper functions for integration tests Fix test config to include required LeaseDurationSeconds field.
Implement P2PLeaseManager for coordinating model downloads: - Lease acquisition with expired lease takeover - Lease renewal for long-running downloads - Complete/release lifecycle management - Ensures only one node downloads from HuggingFace Tests cover: - Lease acquisition (new, existing, expired) - Lease expiration detection - Lease name generation with hash truncation - Renewal and holder verification
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Implement P2PLeaseManager for coordinating model downloads:
Tests cover: