EmbeddingGemma 2: an open, lightweight multimodal embedding model
deepmind.google·6d ago
AI Engineering
Lobsters·Jul 23·5 min read
How MVCC and Transactions Work in RocksDB
TL;DR
RocksDB implements Multi-Version Concurrency Control (MVCC) by creating new versions of keys for writes, allowing concurrent reads and writes without blocking. This approach enhances performance and consistency in database operations.
✦ Why It Matters
Consider adopting MVCC in your database design to improve concurrent access performance.
Key Takeaways
- Utilize RocksDB's versioning for efficient concurrent data access.
- Implement atomic updates using the write batch API.
- Leverage snapshots for consistent reads during transactions.
- Choose between optimistic and pessimistic transactions based on your use case.
How It Works
RocksDB's MVCC mechanism allows concurrent reads and writes by assigning sequence numbers to each key. When a read query starts, it captures the published sequence number, ensuring it only sees data versions that were committed before the read began.
This is facilitated by a skip list structure that allows efficient searching and insertion, while atomic operations ensure that reads and writes can occur simultaneously without locking.