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Active-Active Datastores

A datastore that provides strong replication between 2+ locations in a way that allows both reads and writes to occur at both locations can be referred to as Active Active.

This is in comparison to Active-Passive, which require a failover in order to provide reads/writes at the non-primary location.

There also exists readonly replicas, but those would not qualify as Active-Active, due to the inability to write to the non-primary datastore.

Related Products: Spanner, CockroachDB

Prerequisites: Synchronous Replication

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Related Terms: Active-Passive Datastores, Replication, Consistency, CAP Theorem