Grokking the System Design Interview
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Primary-Replica vs Peer-to-Peer Replication

A user in Tokyo presses Save. The database's primary node is in Virginia, in the United States. The write crosses the Pacific Ocean and returns about 180 milliseconds later. Someone on the team asks: why not let a node in Tokyo accept writes too?

That question is the subject of this lesson. Keeping copies of data on several machines is called replication, and each copy is called a replica. The Redundancy and Replication lesson explains why systems keep copies

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