GCP Professional Data Engineer Practice Question

An online multiplayer game with millions of mobile users must persist each player's profile, inventory, and current game state. The data must be delivered to every client with sub-second latency, automatically synchronize in real time when any device updates it, continue to function when a device is offline, and scale horizontally without manual sharding or capacity planning. Which Google Cloud managed storage service best meets these requirements?

Cloud Bigtable
Cloud Spanner
Firestore in Native mode
Cloud SQL for MySQL

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Answer Description

Firestore in Native mode is built for mobile, web, and server development that needs real-time, bidirectional data synchronization. Its client SDKs stream document changes to and from the backend, provide local caching and offline persistence, and automatically merge updates once connectivity is restored. Firestore scales elastically to millions of concurrent connections, requires no manual sharding, and offers multi-region replication to keep read/write latency low.

Cloud Spanner delivers strong consistency and global scaling but lacks built-in real-time push updates and offline SDK support, making more client-side engineering necessary. Cloud Bigtable excels at high-throughput key-value workloads but provides only server-side APIs with eventually consistent replication and no real-time listeners. Cloud SQL's relational engine cannot scale to millions of concurrent, low-latency connections without significant operational effort and also lacks native real-time synchronization and offline capabilities.

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