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Difficulty: MediumDesigning Infrastructure for Technical Requirements and High Availability

An online gaming enterprise is architecting its real-time session state and player inventory backend on Google Cloud. The workload requires zero data loss (RPO=0RPO = 0) during regional outages along with continuous multi-region availability and transactional consistency. Furthermore, the cloud backend must connect to legacy game server hosts in an on-premises data center using private connectivity capable of sustaining throughput exceeding 15 Gbps. Which TWO architectural components should be selected to meet these high availability and technical requirements?

  1. Deploy a multi-region Cloud Spanner instance configuration to handle the transactional backend workload with synchronous cross-region replication.Answer
  2. B
    Provision a Cloud SQL for PostgreSQL instance with regional High Availability (HA) and asynchronous cross-region read replicas.
  3. Provision redundant 10 Gbps Dedicated Interconnect circuits configured with Cloud Router BGP routing between on-premises and Google Cloud.Answer
  4. D
    Configure multiple HA VPN tunnels with Cloud Router dynamic BGP routing over public internet connections.
  5. E
    Establish VPC Network Peering between the database VPC and a transit VPC, relying on transitive routing to reach a third peered VPC containing on-premises proxy gateways.

Answer

The architecture should use a multi-region Cloud Spanner instance configuration for zero-RPO transactional data consistency across regions, combined with redundant 10 Gbps Dedicated Interconnect connections to satisfy the private high-throughput hybrid network requirements (>15 Gbps).
Combining a multi-region Cloud Spanner deployment with redundant Dedicated Interconnect links satisfies all requirements. Cloud Spanner guarantees multi-region strong consistency and RPO=0RPO = 0 via synchronous Paxos consensus. Dedicated Interconnect provides private, direct network links that easily support bandwidth requirements greater than 15 Gbps without using the public internet.

Step-by-Step Solution

1
Evaluate multi-region transactional storage requirements
Cloud Spanner multi-region instances utilize Paxos consensus across regional nodes to achieve synchronous write replication, guaranteeing RPO=0RPO = 0 across region failures. Cloud SQL uses asynchronous replication for cross-region replicas, which violates the RPO=0RPO = 0 requirement.
Only Cloud Spanner supports globally distributed synchronous relational transactions on GCP.
2
Evaluate hybrid connectivity throughput constraints
The throughput requirement is >15 Gbps> 15\text{ Gbps}. Standard HA VPN is bounded at 3 Gbps per tunnel, whereas Dedicated Interconnect scales up to multiple 10 Gbps or 100 Gbps links over private fiber connections.
Dedicated Interconnect is required for private hybrid connectivity demanding sustained bandwidth above 3 Gbps.

Key Concept

Multi-region high availability architectures require synchronous data replication services (Cloud Spanner) for RPO=0RPO = 0 requirements and dedicated physical interconnects (Dedicated Interconnect) for high-bandwidth (>3 Gbps) hybrid network transport.
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Topics

Designing Infrastructure for Technical Requirements and High Availability