With the release of Percona XtraBackup 8.0.34-39, Percona XtraBackup (PXB) allows a backup on server version 8.0.35 and higher. We have removed the server version check because the MySQL 8.0 series has transitioned to bug fixes.
A feature change in the MySQL 8.0 series, such as the redo log record structure, could cause PXB to fail when taking a backup. To ensure a valid backup, use a PXB version equal to or higher than your source server version. Complete the process and prepare and restore your backups regularly. Do not assume that, because you have no error messages, that the backup ran successfully.
Before the backup starts, PXB checks the source server version to the PXB version to prevent a failed or corrupted backup due to source server changes. Percona XtraBackup 8.0.22 added the no-server-version-check option. This option ignored the check so that the backup could continue and could have one of the following consequences:
- Backup failed
- Backup corrupted
- Backup successful
The check had the following scenarios:
- The source server version and the Percona XtraBackup version are the same: the backup continues.
- The source server version is less than the Percona XtraBackup version: the backup continues.
- The source server version is greater than the Percona XtraBackup version: the backup stops and generates an error message.
- The source server version is greater than the Percona XtraBackup version; with the
--no-server-version-checkoption, the backup continues.
With the release of MySQL 8.0.34, the MySQL 8.0 series transitioned to bug fixes. We do not expect any breaking changes that would break backward compatibility. Therefore, Percona XtraBackup 8.0.34 will backup and restore a server version higher than 8.0.34.
