Out of memory exception when downloading large files from Blob

[ibruynin]

Hi

Based on application insights logs, the following method throws System.OutOfMemoryException exception when downloading files larger than 350Mb on an Azure web app running on 3.5Gb (S2 service plan)

[Edit: it's not that crazy... it's 350Mb :)]

Strathweb.AspNetCore.AzureBlobFileProvider.AzureBlobFileInfo.CreateReadStream

I'll attach the full stack trace in a separate file:
fullstacktrace.txt

I'm not sure if this is intended to be used for large files, but it sure would be a great and powerful feature if it could be used like that!

[ibruynin]

and this is a snapshot of the heap

The large amount of memory is taken by a memorystream instance that seems to take twice the size of the file being downloaded...

[johnayling]

The way it is using a MemoryStream within the CreateReadStream method prevents it from being used for large files. Really want to return a FileStreamResult directly so that the stream acts as a pipe from storage to the client.