aws lambda function not able to create a new instance each time it is invoked and resuses old instances

Question

Hi, I want my java aws lambda function to create a new instance each time it is invoked with a fresh environment.

But as of now it is reusing an existing aws lambda instance which is already created.

I tried setting AWS_LAMBDA_INITIALIZATION_TYPE environment variable to "on-demand" but it doesn't work.

How to achieve the desired outcome.

Mikel Del Tio · Answer

Hello,

According to [AWS documentation](https://docs.aws.amazon.com/lambda/latest/dg/lambda-runtime-environment.html), it's not possible to create a new instance with a fresh environment each time, since after the function and all extensions have completed, Lambda freezes the execution environment for some time in anticipation of another function invocation.

It doesn't always happen,  so do not assume that Lambda automatically reuses the execution environment for all subsequent function invocations, but it is the default/expected behaviour.

Uri Segev · Answer

Lambda was designed to reuse the execution environment between invocations to save on cold starts. Why do you need to create a new one for each invocation?

aws lambda function not able to create a new instance each time it is invoked and resuses old instances

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