Redis 6.0 Stable Release: New Features and Multithreading Support

Redis 6.0.0 GA, the largest release in Redis history, introduces a series of new features and officially adds optional multithreaded I/O support.

Key enhancements include a redesigned client‑side cache that uses only key names, automatic deletion of obsolete RDB files, an expanded ACL system with a new ACL LOG command, improvements to the replication protocol (PSYNC2), support for decimal timeouts in blocking commands, up to 30% faster RDB loading, and a new STRALGO command implementing the longest common subsequence (LCS) algorithm.

The multithreading capability, announced at RedisConf 2019, can double I/O performance by allowing multiple threads to handle network operations, offering an alternative to single‑threaded designs such as Memcached.

Benchmarks comparing single‑threaded and multithreaded Redis for SET and GET operations are shown in the following images:

Although Redis 6.0 GA is stable, the author advises thorough testing before production deployment, and the community plans to release Redis 6.0.1 soon.