What’s New in Redis 6.0? Key Features and Improvements Explained

Redis author announced the stable release of Redis 6.0.0.

From RC1 to now, several changes have been made:

Client‑side caching has been redesigned, dropping the caching slot and using only key names.

Redis now supports a mode where an RDB file used for replication is deleted immediately when it becomes obsolete, allowing pure in‑memory operation.

ACL improvements include a new ACL LOG command that records every ACL violation, showing the client, the disallowed command, and the key, which helps debugging.

The replication protocol PSYNC2 has been enhanced, enabling more frequent partial resynchronizations and allowing replicas to find a common offset with the master.

Commands with timeouts now accept decimal values, extending support beyond whole‑second BLPOP.

RDB loading is 20‑30 % faster depending on file composition, and information is delivered more quickly when many clients are connected.

A new STRALGO command implements complex string algorithms; currently it provides LCS (longest common subsequence), useful for comparing viral RNA or DNA sequences.

Redis 6 is the largest release to date; although it is stable, it should be tested with production workloads before deployment, and a Redis 6.0.1 patch is planned.