# Percona Distribution for MySQL 8.0.27 using Percona XtraDB Cluster (2022-04-11)

| Release date    | April 11, 2022 |
| :-------------- | :--------------- |
|**Installation** | [Installing Percona Distribution for MySQL](installing.md)|

Percona Distribution for MySQL is a single solution with the best and most critical enterprise components from the MySQL open source community, designed and tested to work together.

Percona Distribution for MySQL provides two deployment variants: one is based on *Percona Server for MySQL* and another one is based on *Percona XtraDB Cluster*.

This release of Percona Distribution for MySQL is focused on the *Percona XtraDB Cluster*-based deployment variant. It is based on [Percona XtraDB Cluster 8.0.27-17.1](https://www.percona.com/doc/percona-xtradb-cluster/8.0/release-notes/Percona-XtraDB-Cluster-8.0.27-17.1.html)

## Release Highlights

The following lists a number of the bug fixes for *MySQL* 8.0.27, provided by Oracle, and included in Percona Server for MySQL:


* The `default_authentication_plugin` is deprecated. Support for this plugin may be removed in future versions. Use the `authentication_policy` variable.


* The `binary` operator is deprecated. Support for this operator may be removed in future versions. Use `CAST(... AS BINARY)`.


* Fix for when a parent table initiates a cascading `SET NULL` operation on the child table, the virtual column can be set to NULL instead of the value derived from the parent table.

Find the full list of bug fixes and changes in the [MySQL 8.0.27 Release Notes](https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-27.html).

The following is the list of components supplied with the *Percona XtraDB Cluster*-based deployment variant of Percona Distribution for MySQL:

| Component           | Version   | Description                                |
| ------------------- | --------- | -------------------------------------------|
| Percona XtraBackup  | 8.0.27    | An open-source hot backup utility for MySQL-based servers that doesn’t lock your database during the backup.|
| HAProxy             | 2.4.15    | A high-availability and load-balancing solution for Percona XtraDB Cluster. This is a default proxy.|
| ProxySQL            | 2.3.2     | A high performance, high-availability, protocol-aware proxy for MySQL.          |
| Percona Toolkit     | 3.3.1     | The set of scripts to simplify and optimize database operation. |