Running Spring Boot on Amazon Lambda

Question

I am trying to deploy a Spring Boot application on Amazon Lambda. I noticed that if the handler is called in quick succession - spring tries to reload itself, re-setup the datsources, reload beans etc

Is there anyway to tell Spring Boot not to reinitialize itself if the main method has already been called?

Thanks Damien

Answer 1

As far as I know, a Amazon Lambda is a stateless function, that is instantiated for every request.

If you call the Lambda many times, it is quite normal, that you see a Spring Boot initialization for every request.

If the requests come slowly, its possible that AWS is reusing the same Lambda again, so only one Spring initialization is done.

If the request come fast, or in parallel, AWS will launch more instances of Lambdas to scale dynamically. This explains what you are facing.

I think, using a whole Spring application as an AWS Lambda is not the right approach. A Lambda should be a stateless function, that can be instantiated quickly.

You might try to make your spring app as small as possible, to decrease load time and save resources, as explained in this tutorial.