Rocksdb

Walrus is a Rust-based distributed log streaming engine with Raft-based metadata, segment-ledership, lease-based write fencing, and sealed segments, marketed as a high-performance Kafka alternative with published benchmarks.

A narrow, single-node KV engine removes fsync from the durable path using fixed-size preallocated files, O_DIRECT writes, and a 4KB-aligned journal with atomic commits, delivering roughly 2x higher 4KB-write throughput and lower tail latency on NVMe, but requiring a narrow SSD durability contract and not intended as a general-purpose KV or transaction engine.