I have master/slave setup with two MariaDB 10.x instances. They were bidirectional but for the past two months it was only one direction.
When re-enabling the bi-directional it looks as if the master (where slave was being enable) lost data on some tables for exact period of time it was not setup as a slave. These are InnoDB tables, replicated with statements.
Given it's two months out and the binary logs are not kept for any longer than 3 days, this seems impossible. Is there any factor which could make this kind of data loss possible?