tl;dr : New 'automatic' optimistic conflict detection functions available giving the best of both optimistic and pessimistic replication on the same data MySQL replication supports a number of topologies, and one of the most interesting is an active-active, or master-master topology, where two or more Servers accept read and write traffic, with asynchronous replication between them. This topology
![Eventual consistency with MySQL](https://cdn-ak-scissors.b.st-hatena.com/image/square/a43f742c7b90ce5e693c1448ef30f5fdcf1ae22b/height=288;version=1;width=512/https%3A%2F%2Fblogger.googleusercontent.com%2Fimg%2Fb%2FR29vZ2xl%2FAVvXsEhur2umXhzdJ6zLs9MYcgYHCL_y86WoxiTd4gPlUydc9i9Oixrj9u-AU_iFToG2GqFQJo3YwzbvGy9wuQVWmBQmJq3SeN7LUpS4HyC9uqecjTmW907faIgYad3W-HZkOf0tUQkl06McLVU%2Fw1200-h630-p-k-no-nu%2Fimage2.gif)