AWS Lambda clear /tmp folder on Java17 Runtime

Question

Hi! I'm working on my senior project that involves downloading files from github to the /tmp folder in lambda. Unfortunately that /tmp folder is not automatically cleared after every invocation, and because of that repository files are getting mixed up together. I have been trying to manually clear the folder, but nothing has worked so far, neither shell commands nor java code clears the folder properly. I try to clear it both before and after i'm done using the files, and nothing works.. Any help would be so appreciated!

Behrens, Isaac · Answer

This should help you understand the /tmp environment within Lambda.
https://docs.aws.amazon.com/lambda/latest/operatorguide/execution-environment.html

Note:
Delete any /tmp files before exiting, and **use UUID naming to prevent different instances from accessing the same temporary files**

Clearing the folder is not needed -- you gain efficiency on later invocations by leaving it there as cache.  Only delete items that you specifically add (data) and name the files with UUID or other random names to avoid conflicts between invocations that may overlap.

Hope this helps!

AWS Lambda clear /tmp folder on Java17 Runtime

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