github sysown/proxysql v4.0.8
ProxySQL 4.0.8
on GitHub

latest release: v3.0.8
pre-release8 hours ago

ProxySQL 4.0.8 Release Notes

Release date: 2026-04-25

ProxySQL 4.0.8 is a maintenance release for the AI/MCP Tier, incorporating all improvements from ProxySQL 3.1.8 and 3.0.8. The headline 4.0-specific change in this cycle is the removal of the experimental Rust-based sqlite-rembed dependency, which eliminates the Rust toolchain requirement for PROXYSQLGENAI=1 builds and trims the GenAI documentation accordingly.

Release commit: 6ef036a00c6f1dbcf3f27fe7f6e07f3211d7d6f8

Highlights (AI/MCP Tier)

  • No Rust Toolchain Required: With sqlite-rembed removed, PROXYSQLGENAI=1 (and therefore PROXYSQL31=1) builds no longer require rustc / cargo. sqlite-vec (the C-only sibling) is preserved.
  • FFTO Enabled by Default (4.0.x): FFTO remains enabled by default in 4.0.x, providing full traffic observability out of the box. (FFTO is opt-in in 3.1.x.)
  • All 3.1.8 / 3.0.8 Improvements Included: MySQL session-variable tracking (#5166), PostgreSQL Cluster Sync (#5297), per-server PgSQL backend SSL (#5583), PgSQL backend SSL keylog (#5567), mid-transaction backend-death recovery (#5654, #5659), mysql-zstd_compression_level (#5637), mysql-resolution_family (#5554), and the caching_sha2_password hex-rounds authentication fix.
  • AI/MCP-Tier Package Coverage: The new on-demand package pipeline produces proxysql-4.0.8-* RPMs / DEBs for 13 distros × 2 architectures and proxysql-4.0.8-<sha>-macos-<arch>.tar.gz tarballs for macOS.

New Features (4.0.x)

Build Simplification

Removed Vendored sqlite-rembed and Rust Toolchain Requirement (#5616, c3266dd, 57c3e3f)

The experimental sqlite-rembed-0.0.1-alpha.9 Rust extension (previously vendored under deps/sqlite3/sqlite-rembed-source/) has been removed. The extension's hook pointer was permanently NULL in the runtime, with a TODO admitting the original integration was incomplete — so the extension was never registered at runtime in any tier, stable or GENAI.

With sqlite-rembed gone, the only consumer of rustc/cargo in the tree is removed, and the Rust toolchain detection block in deps/Makefile (along with the SQLITE3_* env exports that existed solely for the cargo build) goes with it. PROXYSQLGENAI=1 builds now succeed with rustc and cargo stripped from PATH.

Documentation in doc/GENAI.md and doc/SQLite3-Server.md has been updated to remove references to sqlite-rembed. Nine rembed-only auxiliary docs/scripts (shell demos, SQL examples, integration guide, posts-embeddings setup, MCP vector embeddings plan, python processor) are also removed. sqlite-vec (the C-only sibling) is preserved unchanged and continues to be registered under #ifdef PROXYSQLGENAI.

Known Limitation: GenAI on Older Distributions

The GenAI tier relies on C++17 features (notably std::regex::multiline) that are unavailable on the libstdc++ shipping with AlmaLinux 8 and on the libc++ shipping with openSUSE Leap 15. proxysql-4.0.8-*-almalinux8* and proxysql-4.0.8-*-opensuse15* packages are therefore not produced in this cycle. Use a newer distribution (AlmaLinux 9+, Fedora 42+, Debian 12+, Ubuntu 22.04+, openSUSE Leap 16) for the GenAI tier.

Features Inherited from v3.1.8 (Innovative Tier)

ProxySQL 4.0.8 includes all features from the v3.1.8 (Innovative) release, including:

  • FFTO Default Behavior: FFTO remains enabled by default in 4.0.x.
  • TSDB Subsystem: Behavior unchanged this cycle (warning cleanup and lint pass only).

Features Inherited from v3.0.8 (Stable Tier)

ProxySQL 4.0.8 includes all features, bug fixes, and improvements from the v3.0.8 release, including:

  • MySQL Session-Variable Tracking — new mysql-session_track_system_variables mode (DISABLED / OPTIONAL / ENFORCED) with backend-driven variable sync and per-server backoff (#5166).
  • PostgreSQL Cluster Sync — peer-to-peer sync for PgSQL admin tables with runtime checksums and save-to-disk (#5297).
  • Per-Server PgSQL Backend SSL — new pgsql_servers_ssl_params admin table mirroring mysql_servers_ssl_params (#5583).
  • PgSQL Backend SSL Keylog — NSS-format keylog for PgSQL backends via libpq PQsetSSLKeyLogCallback patch (#5567).
  • PgSQL Mid-Transaction Backend-Death Recovery — pgsql-preserve_client_on_broken_backend_in_tx (default true) keeps client sessions alive across mid-tx backend death, with new pgsql_tx_poisoned_* counters (#5654, #5659).
  • PgSQL Monitor: Scheduler Clamp on Interval Change — runtime interval changes take effect immediately (#5614).
  • PgSQL CopyCmdMatcher — fast-reject + comment-tolerant regex (#5596).
  • GTID Ranged Updates — internal Gtid_Interval/GTID_Set rework + I3/I4 wire-message parsing (#5224, #5557).
  • MySQL mysql-zstd_compression_level — decoupled from zlib, range 1–22 default 3 (#5637).
  • MySQL mysql-resolution_family — deterministic IPv4/IPv6 backend hostname resolution (#5554).
  • Greeting Capabilities Restored — upper-word capability bits re-advertised in the MySQL greeting.
  • Authentication: caching_sha2_password rounds parsed as hex; CACHING_SHA2_PASSWORD() accepts an optional rounds argument (#5640).
  • Bug Fixes: MySQL 9.x charset handling in validate_charset; GR Monitor first-iteration probe; GTID range validation; GTID parser NULL check after strchr; PgSQL MD5 → EVP migration.
  • Build & Platform: macOS build support (#5664); 156 on-demand Linux package workflows + 6 macOS workflows landing in a single canonical draft release (#5662, #5666, #5668, #5671); ASAN unit-test coverage (#5618).
  • Code Quality: lint and static-analysis sweep across ~100+ files (#5594).

For a detailed list of these core improvements, please refer to the ProxySQL 3.0.8 Release Notes.

Contributors

ProxySQL is a community-driven project, and we are grateful to all the contributors who helped make this release possible. A special thank you to:

  • @wazir-ahmed for MySQL session-variable tracking (#5166), GTID range parsing and unit tests, TSDB / MCP stack maintenance, and the GTID strchr NULL-check.
  • @rahim-kanji for PostgreSQL Cluster Sync (#5297), the mid-transaction backend-death recovery (#5654, #5659), per-server PgSQL SSL parameters (#5583), PgSQL backend SSL keylog (#5567), the CopyCmdMatcher improvements (#5596), the PgSQL Monitor scheduler clamp (#5614), and the MD5→EVP migration.
  • @proton-lisandro-pin for the initial GTID interval refactor that made ranged updates possible (#5224).
  • @mirostauder for continued build system and distribution-support work.

We also thank everyone who reported bugs, tested experimental features, and provided feedback during this release cycle.

Hashes

The release commit is: 6ef036a00c6f1dbcf3f27fe7f6e07f3211d7d6f8

SHA256s: 

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