GCP Professional Cloud Architect Practice Question

A gaming studio is building a new mobile multiplayer game on Android and iOS. Player state (JSON documents under 1 MB) must sync in real time between devices, be available offline, scale automatically to hundreds of thousands of concurrent users worldwide, and enforce per-user access rules integrated with Firebase Authentication. Operational overhead should be minimal. Which Google Cloud data store best meets these requirements?

Cloud Spanner
Cloud Bigtable
Cloud SQL for PostgreSQL backed by Memorystore for Redis
Cloud Firestore in Native mode

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Answer Description

Cloud Firestore in Native mode delivers realtime data synchronization to every connected client and provides built-in offline persistence for the Android and iOS SDKs, so gameplay continues even when devices lose connectivity. As a fully managed, serverless service, it automatically scales to large numbers of concurrent users and offers multi-region replication with strong consistency, minimizing operational effort. Firestore Security Rules integrate directly with Firebase Authentication, allowing per-user or per-document access controls without additional middleware.

Cloud Bigtable and Cloud Spanner can scale massively but offer no native realtime client SDKs, offline caching, or direct Firebase Authentication integration. A solution based on Cloud SQL for PostgreSQL with Memorystore for Redis could be engineered to publish changes through Redis Pub/Sub, yet it provides no built-in offline persistence, requires custom change-capture logic, and demands manual sharding of Cloud SQL to achieve comparable scale, resulting in significantly higher operational complexity.

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