LevelDB MVCC

February 8, 2025 · 502 words · 3 min · LevelDB MVCC Storage

LevelDB implements concurrent sstable read/write operations and snapshot reads through MVCC. Let’s examine its implementation.

Sequence Number LevelDB uses Sequence Numbers as logical clocks to maintain a total order of KV write operations. The Sequence Number is encoded in the last few bytes of the InternalKey. This encoding ensures data ordering during memory writes.