I have just implemented MASTER_GTID_WAIT() in MariaDB 10.0. This can be used to give a very elegant solution to the problem of stale reads in replication read-scaleout, without incuring the overheads normally associated with synchronous replication techniques. This idea came up recently in a discussion with Stephane Varoqui, and is similar to the concept of Lamport logical clock described in this Wikipedia article.
I wanted to describe this, hoping to induce people to test and maybe start using this, as it is a simple but very neat idea, actually.
A very typical use of MariaDB/MySQL replication is[Read more...]