Wrote an essay on how MySQL binlog replication actually works under the hood.
This week, I went deep into binary log formats, event structures, threading models, replication modes, and all the practical considerations for running replication at scale. I have covered how the source (master), replica, relay log, SQL threads, and multi-threaded appliers all coordinate to keep data consistent.
If you want to know and understand how MySQL replicates changes, why row-based logging matters, how replication lag happens, and best practices for production deployments, give this essay a read. It’s pretty in-depth.