While I was working on my grFailOver POC, I have also done some additional parallel testing. One of them was to see how online DDL is executed inside a Group Replication cluster. The online DDL feature provides support for instant and in-place table alterations and concurrent DML. Checking the Group Replication (GR) official documentation, I [&]

https://www.percona.com/blog/2021/04/15/online-ddl-with-group-replication-in-percona-server-for-mysql-8-0-22/