Calling a lambda function once, it's executed twice

Question

This is more of a concern than a question, but still, has anyone experienced this before? Does anyone know how to prevent it?

I have a lambda function (L1) which cal

Answer 1

One case that may cause this is that in your L2 lambda you didn't return anything, which will lead the L1 lambda (the caller) to think there is an error with L2 and so the Retry mechanism is triggered. Try to return something in L2, even simply an "OK".