Maximum file size from S3 a Lambda can open using open() method

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I'm currently developing some lambdas to execute Python script on text files hosted on S3.

Those text files can be quite large (up to 1GB), as far as I know, Lambda has a 512Mb tmp directory, so I assume I can only load a 512MB file.

But I also read that it has up 10240MB function memory allocation.

So will I be able to open a 1GB file from S3 using the open() method?

If somebody can also give me some insights to a newbie about the difference of that tmp folder and memory ==> If the memory is 10GB why would one want to use the 512MB tmp folder?

Thanks a lot!

Have a great 2022 year

aws-lambda amazon-web-services amazon-s3 python
1 Answers

You can use regular get_object, without the need to write it to /tmp:

s3 = boto3.client('s3')

def lambda_handler(event, context):

    response = s3.get_object(
        Bucket='your-bucket',
        Key='your-key'
    )
    
    # get the content of the file as bytes 
    text_bytes = response['Body'].read()
    
    # change it to string
    text_str  = text_bytes.decode()

    # process as you want the text_str
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