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An e-commerce company hosts an order submission system on Google Cloud. During marketing flash sales, order submission traffic increases tenfold.
Currently, the frontend microservice synchronously calls an external legacy third-party inventory and payment verification system for each submitted order. The legacy system has strict throughput limitations, does not scale elastically, and responds with high latency under load. Consequently, during traffic spikes, frontend connection pools become exhausted, requests time out, and customer orders fail.
The architecture must meet the following requirements:
Which integration architecture should you implement?
This architecture combines Apigee API Management with Cloud Pub/Sub asynchronous messaging to decouple frontend intake from downstream processing. Apigee acts as the API gateway providing entry governance, security, and traffic shaping, while Cloud Pub/Sub serves as a distributed, highly scalable buffer that temporarily persists incoming order messages until backend consumers are ready to process them.
Synchronous calls to non-scaling backends inevitably lead to connection starvation and elevated error rates during peak traffic. Introducing asynchronous messaging breaks the temporal coupling between the client request and the third-party execution, fulfilling both customer responsiveness and backend protection.
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