v8.6.0

This is the General Availability release of Redis 8.6 in Redis Open Source.

Major changes compared to 8.4

• Substantial performance improvements
• Substantial memory reduction for hashes (hashtable-encoded) and sorted sets (skiplist-encoded)
• Streams: XADD idempotency (at-most-once guarantee) with new IDMPAUTO and IDMP arguments
• New eviction policies - least recently modified: volatile-lrm and allkeys-lrm
• Hot keys detection and reporting; new command: HOTKEYS
• TLS certificate-based automatic client authentication
• Time series: support NaN values; new aggregators: COUNTNAN and COUNTALL

For more details, see the 8.6 release blog post.

Binary distributions

• Alpine and Debian Docker images - https://hub.docker.com/_/redis
• Install using snap - see https://github.com/redis/redis-snap
• Install using brew - see https://github.com/redis/homebrew-redis
• Install using RPM - see https://github.com/redis/redis-rpm
• Install using Debian APT - see https://github.com/redis/redis-debian

Operating systems we test Redis 8.6 on

• Ubuntu 22.04 (Jammy Jellyfish), 24.04 (Noble Numbat)
• Rocky Linux 8.10, 9.5
• AlmaLinux 8.10, 9.5, 10.1
• Debian 12 (Bookworm), Debian 13 (Trixie)
• macOS 14 (Sonoma), 15 (Sequoia)

New Features (compared to 8.6-RC1)

• #14695 Keys memory size histograms

Performance and resource utilization improvements (compared to 8.6-RC1)

• #14714 Optimize user ACL permission verification
• #14692 Optimize peak memory metric collection
• #14739 Avoid allocating and releasing list node in reply copy avoidance
• #14713 Reduce per command syscalls by reusing cached time when hardware monotonic clock is available
• #14726 Optimize XREADGROUP CLAIM
• #13962 Vector set: replace manual popcount with __builtin_popcountll for binary vector distance (Intel, AMD, ARM)
• #14474 Vector set: vectorized the quantized 8-bit vector distance calculation (Intel, AMD)
• #14492 Vector set: vectorize binary quantization path for vectorsets distance calculation (Intel, AMD)

Configuration parameters

• #14719 cluster-slot-stats-enabled - per-slot resource consumptions statistics to collect
• #14695 key-memory-histograms collect memory consumption histograms per data type

Metrics

• #14695 db0_distrib_lists_sizes, db0_distrib_sets_sizes, db0_distrib_hashes_sizes, db0_distrib_zsets_sizes

known bugs and limitations

• Streams: avoid using XADD with the new IDMP or IDMPAUTO options when using appendonly yes with aof-use-rdb-preamble no (non default). This limitation will be removed in the next patch.