Recently, we had an edge case where a MySQL slave went out-of-sync but it couldnt be rebuilt from scratch. The slave was acting as a master server to some applications and it had data was being written to it. It was a design error, and this is not recommended, but it happened. So how do you [&]

https://www.percona.com/blog/2019/03/13/live-mysql-slave-rebuild-with-percona-toolkit/