What data structure implements RocksDB's default MemTable?

RocksDB's default MemTable implementation uses a skip list to keep incoming writes ordered by key.

• A skip list supports efficient, roughly logarithmic-time insertion and lookup, similar in spirit to a balanced tree
• Keeping the MemTable sorted means it can be flushed directly into an already-sorted SSTable with no extra sorting step needed
• RocksDB is also pluggable here, alternative memtable implementations exist for specific workload patterns

The skip list's combination of simplicity and efficient ordered access is a big part of why it was chosen as RocksDB's default in-memory structure.

Invest now in Acorns!!! 🚀
Join Acorns and get your $5 bonus!

Acorns is a micro-investing app that automatically invests your "spare change" from daily purchases into diversified, expert-built portfolios of ETFs. It is designed for beginners, allowing you to start investing with as little as $5. The service automates saving and investing. Disclosure: I may receive a referral bonus.

Invest now!!! Get Free equity stock (US, UK only)!

Use Robinhood app to invest in stocks. It is safe and secure. Use the Referral link to claim your free stock when you sign up!.

The Robinhood app makes it easy to trade stocks, crypto and more.

Webull! Receive free stock by signing up using the link: Webull signup.