So, the other day I posted the performance benchmarks for the multi-master MariaDB/Galera cluster. Spectacular performance. But some of you may justifiably say:

— Well, we were born into a master/slave world. We, like, adapted to it. We have invested so much brain power to make our applications to work in master/slave environment. What do we do now with all these read/write splitting voodoo Lua scripts and slave lag battling techniques? And master failover... There's a whole industry there. Thousands of jobs!

— But of course! — I say, — Galera likes read/write splitting like the other guy. If you want a node as a slave - just don't use it as a master, simple as that. (Slave lag and master failover will have to go though. Sorry about that.)

Also about a year ago I was so fed up with the expert opinions about how synchronous replication is "slow" (Why "slow"? The word "synchronous" does not even have …