Since PostgreSQL 9.5 logical replication has replication origin infrastructure for replication progress tracking. Now 16th version is coming with feature which made bi-directional replication setups possible using said infrastructure. In earliest reviews it got a nickname of "native multimaster" for cluster, interconnected with said replication, bearing some resemblance to PostgresPro's Multimaster. We're going to figure out degree of it and explain insides of them. Talk expects you to have a basic knowledge of WAL insides and it's role in PostgreSQL functioning.