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We originally had [b][COLOR=red]one master replica[/color][/b] and [b][COLOR=red]three read/write replicas[/color][/b] of a particular partition. One day, seemingly out of the blue, [b][COLOR=red]one of our read/write replicas[/color][/b] has become a [b][COLOR=red]second master[/color][/b].
Are there any ideas on what may have caused this? Are there any concerns that should be taken into account before getting rid of one of the master replicas?
I'd greatly appreciate any help you can give me.