Master-Slave

Definitions

1. A replication or control architecture where one node (master/primary) accepts writes and propagates changes to one or more read-only nodes (slaves/replicas). Widely used in databases (MySQL, PostgreSQL) for read scaling and failover. The terminology is being replaced by primary-replica in many projects.

   In plain English: A setup where one main computer handles updates and copies them to helper computers that only serve read requests.

   Example: "Reads go to the replicas, writes go to the primary — the old docs still call it master-slave but we've renamed everything."

Related Terms

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• Event-Driven Architecture
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• ADR
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• Write Concern