Lambda Layers
Additional libraries may be bundled and moved as a layer.
Lambda can have upto 5 layers per function, with maximum deployment size limit of 50 MB/layer.
The packages added in layers are available in
/optdirectory during invocations.
Custom Runtimes
Allows languages that are not officially supported by AWS to be used to develop and deploy on Lambda.
C++ rutimes is one such example. Some of the common ones can be found here.
Externalize Dependencies
Dependencies which we use in our lambda code may not change often compare to our application/lambda code. So in order to avoid reuploading dependencies which seldom changes, one can leverage the lambda layers.
As layers are externalized they can be reused across multiple function code.
References
Using Lambda Layers
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