Developers
Metadata Backend Guide
Add a new metadata backend.
Metadata backends provide transactional storage for the namespace, inodes, and slice descriptors. The core abstraction is a transactional key-value / relational client with:
- Namespace operations (lookup, readdir, rename)
- Inode attribute reads and writes
- Slice descriptor append and compaction commits
- Transactions covering multi-key updates
Start from the SQLx implementation (simplest to follow), then compare with the Redis implementation for the latency-optimized variant. Correctness is enforced by a shared transaction test suite that every backend must pass.