Release Notes for MariaDB MaxScale 2.5.13


MariaDB MaxScale is an advanced database proxy, firewall, and query router.

MariaDB MaxScale 2.5.13 was released on 2021-06-04. This release is of General Availability (GA) maturity.

Issues Fixed

Can result in a hang or crash

Can result in unexpected behavior

  • When a client executed the EXPLAINEXPLAIN statement, the internal query classifier leaked a small amount of memory. (MXS-3566)

  • When a client executed a server-side prepared statement by sending a COM_STMT_EXECUTE packet with no metadata, the Read/Write Split Router (readwritesplit) required the request to be sent to the previous target server. (MXS-3565)

  • When a client attempted to authenticate using a specific authentication plugin, the plugin name was compared to the names of supported authentication plugins in a case sensitive manner. Starting with this release, plugin names are compared in a case insensitive manner. For example, both PAM and pam resolve to the pam authentication plugin. (MXS-3548)

  • When the max_slave_connections parameter was set to 0, the Read/Write Split Router (readwritesplit) refused all connections. Starting with this release, the router will only connect to the primary server when the max_slave_connections parameter is set to 0 (MXS-3536)

  • When a user-defined variable was referenced in a JOIN clause, the internal query classifier did not detect it, and MaxScale routed the query to the wrong target server. (MXS-3535)

  • When the syslog parameter was changed at runtime with maxctrl alter maxscale, the runtime value of the parameter was not changed. (MXS-3524)

  • When the maxlog parameter was disabled, MaxScale wrote messages to the MaxScale log during startup. (MXS-3479)

  • The CURRENT_TIMESTAMP() function can cause a parser error. (MXS-3589)

  • Read/Write Split router sending SET STATEMENT statements to replica servers on parser errors. (MXS-3586)

  • When using persistent connections, connection shutdowns right after creation are treated as an error. (MXS-3582)

  • Replicator component does not check node state for every operation. (MXS-3581)


In alignment to the MariaDB Corporation Engineering Policy, MariaDB MaxScale 2.5.13 is provided for:

  • CentOS 7

  • Debian 9

  • Debian 10

  • Red Hat Enterprise Linux 7

  • Red Hat Enterprise Linux 8

  • SUSE Linux Enterprise Server 12

  • SUSE Linux Enterprise Server 15

  • Ubuntu 18.04

  • Ubuntu 20.04