Since TiDB v6.0.0, the default value of new_collations_enabled_on_first_bootstrap has changed from false to true. BR backs up the new_collations_enabled_on_first_bootstrap configuration of the upstream cluster and then checks whether the value of this configuration is consistent between the upstream and downstream clusters. If the value is consistent, BR safely restores the data backed up in the upstream cluster to the downstream cluster. If the value is inconsistent, BR does not perform the data restore and reports an error.
Suppose that you have backed up the data in a TiDB cluster of an earlier version of v6.0.0, and you want to restore this data to a TiDB cluster of v6.0.0 or later versions. In this situation, you need to manually check whether the value of new_collations_enabled_on_first_bootstrap is consistent between the upstream and downstream clusters:
- If the value is consistent, you can add
--check-requirements=falseto the restore command to skip this configuration check. - If the value is inconsistent, and you forcibly perform the restore, BR reports a data validation error.