java - How can I calculate "uncompressed" size for AWS Lambda?

Question

I am trying to understand the deployment size limits for AWS Lambda as I encountered the following error after adding another layer to my Lambda function:

An error occurred: <function name> - Function code combined with layers exceeds the maximum allowed size of 262144000 bytes. The actual size is 269081659 bytes. (Service: AWSLambdaInternal; Status Code: 400; Error Code: InvalidParameterValueException; Request ID: <request ID>; Proxy: null).

I understand that the total uncompressed size of code + layers cannot exceed 250 MiB but I cannot understand how my code and layers have breached that limit. I especially cannot make my layers add up to the 'actual size' stated in the error.

I am using the Java 8 runtime and my jar is 54 MiB. Unzipped it is 140 MiB. I had two existing layers with the following sizes:

Layer	Compressed size	Uncompressed size
Elasticsearch (jar)	22 MiB	54 MiB
ImageMagick	17 MiB	58 MiB

Answer 1

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