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Using multipart uploads, Amazon S3 retains all the parts until the upload is either completed or aborted. In an anonymous drop situation, it would be good for abandoned uploads to be automatically aborted after a timeout to reclaim the space and avoid the cost of holding any parts that made it.
It would be possible to create some external monitor using ListMultipartUploads, but it would be better if S3 did it automatically.
If you initiate an upload and maybe upload some parts, but then do nothing further, will S3 eventually abort it for the bucket owner?
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Multipart upload completion When you complete a multipart upload, Amazon S3 creates an object by concatenating the parts in ascending order based on the part number. If any object metadata was provided in the initiate multipart upload request, Amazon S3 associates that metadata with the object.
You can stop an in-progress multipart upload by calling the AmazonS3. abortMultipartUpload method. This method deletes any parts that were uploaded to Amazon S3 and frees up the resources. You must provide the upload ID, bucket name, and key name.
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.
Can Amazon S3 uploads resume on failure or do they need to restart? A. B. You can resume them, if you flag the “resume on failure” option before uploading.
You can set this here:
https://aws.amazon.com/blogs/aws/s3-lifecycle-management-update-support-for-multipart-uploads-and-delete-markers/
and say afer 7 days or so, just delete them.
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Note the newer setting mentioned in Andrew's answer
Original response:
No. From the doc page you linked, "Once you initiate a multipart upload, Amazon S3 retains all the parts until you either complete or abort the upload."
If you do not either complete or abort the upload, any parts that have been uploaded will just kinda hang around and cause you storage charges until you do so.
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