Is Left-Right a generic concurrency control?

Spoiler alert, yes, Left-Right is a generic concurrency control! We mentioned Left-Right many times before, but here it goes again. Left-Right is a technique where two replicas of your data are kept up to date. Mutative operations execute in one replica while the other replica can be read by in-flight readers and then the role of the replicas toggles for the write to apply the same operation on th