Release Notes for MariaDB Enterprise Server 10.3.20-4

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

MariaDB Enterprise Server 10.3.20-4 was released on 2019-11-18.

Fixed Security Vulnerabilities

Notable Changes

• New option innodb_change_buffer_dump added to Debug builds. This option dumps the contents of the InnoDB change buffer to the server error log at startup. This is useful when a slow shutdown cannot be performed successfully. (MDEV-20864)

• Eliminated unnecessary logging of warnings to the error log regarding InnoDB maximum row size for DML statements which should be present only for DDL operations. (MENT-454)

Issues Fixed

Can result in data loss

• mariabackup --prepare --export ... could overwrite binary logs if certain conditions were present. (MDEV-20703) Conditions which must be present to trigger this bug:
  • mariabackup is executed on the MariaDB Server host, and
  • Configuration files from the master are used, and
  • Configuration files enable binary logging

• If unable to upgrade to MariaDB Enterprise Server 10.3.20-4, where this bug is fixed, a workaround is available: use the --defaults option to mariabackup to avoid the bug-triggering conditions by specifying a different configuration file.

Can result in a hang or crash

• Prior removal of a #FULLTEXT# index from an InnoDB table can cause a hang on startup. (MDEV-19647)

• Removal of a #FULLTEXT# index from an InnoDB table can cause a hang. (MDEV-19529)

• Change to a InnoDB table containing a #FULLTEXT# index can cause Server to become unresponsive. (MDEV-20987)

• Removal of a virtual column used by an index can result in a crash. (MENT-434)

• CREATE INDEX, ALTER TABLE , or OPTIMIZE TABLE on an InnoDB table can cause Server to become unresponsive. (MDEV-20852)

• INSTANT ADD COLUMN on an InnoDB table which includes a FOREIGN KEY definition can result in a crash. (MENT-435)

Can result in unexpected behavior

• Unnecessary logging of warnings to the error log regarding InnoDB maximum row size for DML statements which should be present only for DDL operations. (MENT-454)

• After server restart, a SELECT using a #FULLTEXT# index on InnoDB tables can fail to return some data. (MDEV-19073)

• MariaDB Enterprise Backup and MariaDB Backup, when using mbstream, recreated xtrabackup_info in the same directory as the backup file. Repeated extract of the backup could fail. (MDEV-18438)

• mysqld_multi.sh script could not be launched and returned a syntax error. (MENT-433)

• Though not supported on Microsoft Windows, the server_audit_output_type system variable for the Audit plugin accepted a SYSLOG value. (MDEV-19851)

• FOREIGN KEY constraints have been ignored during DELETE when parent table is System-Versioned. (MDEV-16210)

• DELETE from child table with FOREIGN KEY was not possible when the table is System-Versioned. (MDEV-20812)

Related to install and upgrade

• Installing MariaDB Enterprise Server from repository failed on CentOS 7 due to package dependencies. (MENT-420)

Interface Changes

• WARN_INNODB_PARTITION_OPTION_IGNORED error code added

Platforms

In alignment to the enterprise lifecycle, MariaDB Enterprise Server 10.3.20-4 is provided for:

• CentOS 8

• CentOS 7

• CentOS 6

• Debian 10

• Debian 9

• Debian 8

• Red Hat Enterprise Linux 8

• Red Hat Enterprise Linux 7

• Red Hat Enterprise Linux 6

• SUSE Linux Enterprise Server 15

• SUSE Linux Enterprise Server 12

• Ubuntu 18.04

• Ubuntu 16.04

• Microsoft Windows

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