问题
We are facing the following dilemma:
Our mobile client application will be user-authenticating through a BaaS (Backend-as-a-Service) and will then need to send a file to the cloud - specifically an Amazon EC2 server where the main processing will take place. Since the time of processing of the file might take place later, there is a need to store the files (and there is also a prospect of keeping an archive of them for future use by the users). The question is what would you suggest as the preferred way from the following:
a) send the file to the EC2 server directly which will then issue an Amazon S3 request to save the file there
OR
b) store the file to the BaaS (which in our case is parse.com which uses S3 as its data-storage) and retrieve it later by the EC2 server
The cost of transferring a file from EC2 to S3 and inverse is 0 as long as both are on the same region which in both a) and b) cases is true. The problem is that there is a need for mapping each user to the files that he has access to and a) and b) differ a lot in this case.
回答1:
So basically you are sending file to EC2 - EC2 is processing it and saving it to S3 or it is just saving it to S3 ??.I used a very easy way of transferring data from Ec2 to S3. i.e. s3fuse :- you can basically mount EC2 drive with S3 , so when you store something on EC2, it will automatically be stored in S3 also. Might be handy for you.
来源：https://stackoverflow.com/questions/12047815/best-way-of-storing-and-retrieving-files-baas-or-s3