0.3

MVCC

• add version support in Memtable and SST storage
• implement watermark and transaction, supports Optimistic Concurrency Control (OCC)
• implement serializable snapshot isolation
• compaction filter

0.2

Compaction and Persistence

• Implements compaction, include strategies below:
  • Full compaction
  • Simple compaction
  • Tiered compaction, refs to Universal Compaction - RocksDB Wiki
  • Leveled compaction, refs to Leveled Compaction - RocksDB Wiki
• LSM state persistence:
  • Write ahead log(WAL)
  • Manifest

0.1

Basic LSM implement, includes:

• Memtable
• SST and Block encoding, decoding
• LSM Storage engine