Exam Professional Cloud Developer topic 1 question 269 discussion

I'd go with B. Sure it may be costly but this option is far more adequate than A or C. Not D because performance and scalability for the Cloud Spanner emulator is not comparable to the real service: https://cloud.google.com/spanner/docs/emulator#limitations

Since the testing needs to accommodate scenarios where multiple commits are made simultaneously, and hence multiple tests might run concurrently, the testing environment should support isolated and independent testing instances to avoid interference among tests. Given these requirements, using the Cloud Spanner emulator would not be the best choice for this scenario. The emulator is primarily suited for local development, unit, and integration testing, and is not built for production-scale performance testing. It may not accurately replicate performance characteristics at scale or under load, which are crucial aspects in this case.

B is the right choice in my opinion

D. https://cloud.google.com/sdk/gcloud/reference/beta/emulators/spanner Use an emulator if possible when testing. B. It could work, but in real world, spanning an cluster of cloud spanner takes a lot of time, and also money

Isolation of Test Environments: Creating a new Cloud Spanner instance for each build ensures complete isolation of test environments. This is crucial for accurate performance testing, as it avoids any interference from other concurrent test runs. Consistency and Accuracy of Data: By loading the required data into each new instance, you ensure that every test starts with a consistent dataset, which is essential for reliable and repeatable performance testing. Resource Management: Automatically deleting the Cloud Spanner instance after each test helps manage resources and costs effectively. It ensures that you are only using and paying for resources during the duration of the test. Parallel Testing: This approach supports concurrent testing for multiple commits, as each test run has its own dedicated Cloud Spanner instance.