feat: Implement WAL-based RaftLog storage #16776
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Replace sled-based storage with a dedicated WAL implementation optimized for Raft Log operations. The new implementation provides: Performance improvements: - Non-blocking batched fdatasync - FILO caching for latest logs (configurable size/count) - ~0.5ms write latency Compatibility: - Backward compatible with existing data format - Auto-upgrades from V003 to V004 format on startup - Supports rolling upgrades (no protocol changes) - databend-metactl supports both V003/V004 import/export Technical details: - New storage format: V004 - Optimized specifically for Raft Log operations - Preserves all existing functionality
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Summary
feat: Implement WAL-based RaftLog storage
Replace sled-based storage with a dedicated WAL implementation optimized
for Raft Log operations. The new implementation provides:
Performance improvements:
Compatibility:
Technical details:
Tests
Type of change
Related Issues
This change is