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In the aws-sdk's S3 class, what is the difference between upload() and putObject()? They seem to do the same thing. Why might I prefer one over the other?
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Adds an object to a bucket. You must have WRITE permissions on a bucket to add an object to it. Amazon S3 never adds partial objects; if you receive a success response, Amazon S3 added the entire object to the bucket.
When you upload large files to Amazon S3, it's a best practice to leverage multipart uploads. If you're using the AWS Command Line Interface (AWS CLI), then all high-level aws s3 commands automatically perform a multipart upload when the object is large. These high-level commands include aws s3 cp and aws s3 sync.
If you pass the same key to upload a file, it is replaced, unless versioning is on. S3 supports versioning. This means that when you upload to the same key twice, two versions of the file are stored. Note that if you upload the exact same file twice, you get to pay for two identical copies of the same file on S3.
The advantage to using AWS SDK upload() over putObject() is as below:
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