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Master / slave are catch all terms versus more precise ones that represent the exact relationship of two systems.

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I personally prefer primary/secondary anyway.

So do I, but I wouldn't care enough to start a debate about it.

If you did care enough to debate about it, that's okay.

That doesn't infer the same relationship of dependency, but infers a parallel independent relationship.

Not the same thing.

Primary / Replica.

That's not either, slave is not always a "replica" of the master, only in some contexts.

And a master does not even need a slave (like in the github case) - so git's master is not even like the master (who had slaves) that people are offended about.

It's more similar to the meaning of audio master, like a reference copy, not that branches are slave of it.

So in a master slave database setup, the slave does all the work while the master supervises?

That's... A really good argument.

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