What happens to the target file (i.e. the file being written) if an error occurs during the copy-operation on AWS S3? The API documentation states this;
You create a copy of your object up to 5 GB in size in a single atomic action using this API
Does that mean that for files < 5 GB in size, no partial target file will be written/visible?
Objects will never be in a 'partial' in S3. Either the whole file is available, or none of it is.
If the file is less than 5GB, it can be uploaded with a normal upload command. If it works, then it appears. If it fails, then there is no change on S3.
Larger files need Uploading and copying objects using multipart upload - Amazon Simple Storage Service. This uploads the file in 'parts', and each part can be retried. When all parts are uploaded, a final command tells S3 to join the parts into one Object.
