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Percona Software for MySQL Documentation

Percona Distribution for MySQL 8.0.32 using Percona XtraDB Cluster (2023-04-18)

Release date April 18, 2023
Installation Installing Percona Distribution for MySQL

Percona Distribution for MySQL is the most stable, scalable and secure open-source MySQL distribution, with two download options: one based on Percona Server for MySQL and one based on Percona XtraDB Cluster.

This release is focused on the Percona XtraDB Cluster-based deployment variation. It is based on Percona XtraDB Cluster 8.0.32-24

Release highlights

  • Percona decided to revert the following MySQL bug fix:

The data and the GTIDs backed up by mysqldump were inconsistent when the options --single-transaction and --set-gtid-purged=ON were both used. It was because in between the transaction started by mysqldump and the fetching of GTID_EXECUTED, GTIDs on the server could have increased already. With this fixed, a FLUSH TABLES WITH READ LOCK is performed before the fetching of GTID_EXECUTED to ensure its value is consistent with the snapshot taken by mysqldump.

The MySQL fix also added a requirement when using –single-transaction and executing FLUSH TABLES WITH READ LOCK for the RELOAD privilege. (MySQL bug #109701, MySQL bug #105761)

The Percona Server version of the mysqldump utility, in some modes, can be used with MySQL Server. This utility provides a temporary workaround for the “additional RELOAD privilege” limitation introduced by Oracle MySQL Server 8.0.32.

For more information, see the Percona Performance Blog A Workaround for the “RELOAD/FLUSH_TABLES privilege required” Problem When Using Oracle mysqldump 8.0.32.

  • The ProxySQL version is updated from 2.4.8 to 2.5.1.

  • The HAProxy version is updated from 2.5.12 to 2.6.12. The changes introduced by HAProxy 2.6.0 are the following:

    • The SSL engines are disabled by default. This means that the ssl-engine keyword does not work. The ssl-engine keyword may be re-enabled by building with “USE_ENGINE=1” and ignoring the warnings.

    • openssl 0.9.8 is no longer supported.

    • The HTTP version in HTTP/1.1 requests does not accept Real Time Streaming Protocol (RTSP) unless you use the accept-invalid-http-requests option.

    • A h1-accept-payload-with-any-method global directive is added. This global directive allows users using HTTP/1.0 to send a payload with GET, HEAD, and DELETE requests.

    Find the full list of changes in the HAProxy 2.6.12 release notes, Announcing HAProxy 2.6 blog post, and in the HAProxy 2.6.0 release announce.

Improvements and bug fixes introduced by Oracle for MySQL 8.0.32 and included in Percona XtraDB Cluster and Percona Distribution for MySQL are the following:

  • A replica can add a Generated Invisible Primary Keys(GIPK) to any InnoDB table. To achieve this behavior, the GENERATE value is added as a possible value for the CHANGE REPLICATION SOURCE TO statement’s REQUIRE_TABLE_PRIMARY_KEY_CHECK option.

  • The REQUIRE_TABLE_PRIMARY_KEY_CHECK = GENERATE option can be used on a per-channel basis.

  • Setting sql_generate_invisible_primary_key on the source is ignored by a replica because this variable is not replicated. This behavior is inherited from the previous releases.

  • An upgrade from 8.0.28 caused undetectable problems, such as server exit and corruption.

  • A fix for after an upgrade, all columns added with ALGORITHM=INSTANT materialized and have version=0 for any new row inserted. Now, a column added with ALGORITHM=INSTANT fails if the maximum possible size of a row exceeds the row size limit, so that all new rows with materialized ALGORITHM=INSTANT columns are within row size limit. (Bug #34558510)

  • After a drop, adding a specific column using the INSTANT algorithm could cause a data error and a server exit. (Bug #34122122)

  • An online rebuild DDL no longer crashes after a column is added with ALGORITHM=INSTANT. Thank you Qingda Hu for reporting this bug. (Bug #33788578, Bug #106279)

Find the full list of bug fixes and changes in the MySQL 8.0.32 Release Notes.

Supplied components

Review each component’s release notes for What’s new, improvements, or bug fixes. The following is a list of the components supplied with the Percona XtraDB Cluster-based variation of the Percona Distribution for MySQL:

Component Version Description
Percona XtraBackup 8.0.32-26 An open-source hot backup utility for MySQL-based servers that doesn’t lock your database during the backup.
HAProxy 2.6.12 A high-availability and load-balancing solution for Percona XtraDB Cluster. This is a default proxy.
ProxySQL 2.5.1 A high performance, high-availability, protocol-aware proxy for MySQL.
Percona Toolkit 3.5.2 The set of scripts to simplify and optimize database operation.
relication_manager.sh 1.0 A tool to manage multi-source replication between multiple Percona XtraDB Cluster clusters.

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