Release Notes for MariaDB MaxScale 2.5.21

Overview

MariaDB MaxScale is an advanced database proxy, firewall, and query router. MaxScale is a component of MariaDB Enterprise.

MariaDB MaxScale 2.5.21 was released on 2022-07-13. This release is of General Availability (GA) maturity.

Notable Changes

Issues Fixed

Can Result in Crashes, Hangs, Stalls

Can Result in Unexpected Behavior

  • When the same query is executed multiple times, the size of the query classifier cache could incorrectly increase, even though the query was only cached once. (MXS-4194)

    • In earlier releases, repeatedly executing a query could cause the size of the query classifier cache to surpass the value of the query_classifier_cache_size parameter, which would cause the query classifier cache to be disabled.

    • Starting with this release, the size of the query classifier cache is updated correctly when the same query is executed multiple times.

Install and Upgrade

  • When the MaxScale package is installed, the /etc/maxscale.cnf.d/ directory is not automatically created. (MXS-4134)

Platforms

In alignment to the MariaDB Corporation Engineering Policy, MariaDB MaxScale 2.5.21 is provided for:

  • CentOS 7 (x86_64)

  • Debian 9 (x86_64 / ARM64)

  • Debian 10 (x86_64 / ARM64)

  • Debian 11 (x86_64 / ARM64)

  • Red Hat Enterprise Linux 7 (x86_64)

  • Red Hat Enterprise Linux 8 (x86_64 / ARM64)

  • Rocky Linux 8 (x86_64 / ARM64)

  • SUSE Linux Enterprise Server 15 (x86_64 / ARM64)

  • Ubuntu 18.04 (x86_64 / ARM64)

  • Ubuntu 20.04 (x86_64 / ARM64)

  • Ubuntu 22.04 (x86_64 / ARM64)