Release Notes for MariaDB Enterprise Server 10.3.21-5


This fifth release of MariaDB Enterprise Server 10.3 is a maintenance release, including a variety of fixes.

MariaDB Enterprise Server 10.3.21-5 was released on 2020-01-06.

Notable Changes

Issues Fixed

Can result in data loss

  • A table could not be loaded after an instant ALTER ... ADD COLUMN or ALTER ... DROP COLUMN, if the primary key is a CHAR column with variable-length encoding like UTF8 (MDEV-21088)

Can result in a hang or crash

  • Primary (master) could crash when it executes RESET MASTER and a replica (slave) reconnects having reset its connection status with the primary (e.g., CHANGE MASTER TO MASTER_USE_GTID = slave_pos). (MENT-19376)

  • "Out of memory" error could occur when accessing partitioned InnoDB tables. (MDEV-20611)

  • A crash could occur when ADD PRIMARY KEY was executed by a connection just after another connection issued an instant ADD COLUMN to the same InnoDB table and if DMLs were executed at the same time. (MDEV-21045)

Can result in unexpected behavior

Interface Changes

  • None.


In alignment to the enterprise lifecycle, MariaDB Enterprise Server 10.3.21-5 is provided for:

  • Red Hat Enterprise Linux 8

  • Red Hat Enterprise Linux 7

  • Red Hat Enterprise Linux 6

  • CentOS 8

  • CentOS 7

  • CentOS 6

  • Ubuntu 18.04

  • Ubuntu 16.04

  • Debian 10

  • Debian 9

  • Debian 8

  • SUSE Linux Enterprise Server 15

  • SUSE Linux Enterprise Server 12

  • Microsoft Windows

Some components of MariaDB Enterprise Server might not support all platforms. For additional information, see "MariaDB Corporation Engineering Policies".


CentOS 6, Debian 8, and Red Hat Enterprise Linux 6 are no longer supported as per the MariaDB Engineering Policy. Older releases are available from the MariaDB Downloads page. Instructions for installation are included as a README file within the download.