Sachin Setiya <sachin.setiya@mariadb.com> writes:

Can we do something like send total no of Rows_log_events in a event group to slave. We can write this info in Gtid_log_event. Reason for doing this is that on slave we can show how much progress we have made.

My immediate impression is that this sounds like a bad idea. It increases the binlog size without adding any real information - after all the event count can be determined easily by just reading the events. It also requires careful design and testing for impact on forwards- and backwards compatibility. And event count is not a very meaningful progress indicator. One event group could have 10 Rows_log_event each with a single row operation. While another could have a single Rows_log_event that contains a hundred row operations. And why only rows event? What about Query_log_events in a transaction in statement-based replication? - Kristian.