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Whether you choose Azure Functions or AWS Lambda, you cannot easily switch to another. Performance - Serverless Functions that are used less frequently may suffer from warmup response latency, where the infrastructure needs some time to deploy the function. Amazon: AWS Lambda. On Public Clouds: Microsoft: Azure Functions.
Given that Amazon’s AWS Lambda functions are only five years old this November, anyone with more than three years of experience is a very early adopter. Testing is more complex and labor intensive for serverless architectures, with more scenarios to address and different types of dependencies (e.g., latency, startup, mocking, etc.)
I was a little restricted in my thinking the first time around and I’ve come to see FaaS as something not quite stateless, since caching state in a Lambda instance that might stick around for 5 hours is a perfectly reasonable idea. I also rewrote the section on Startup Latency since Cold Starts are one of the big “FUD” areas of Serverless.
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