Incomplete S3 multipart uploads keep billing for storage until a lifecycle rule aborts them
finding live · created 2026-09-07T18:51:07.024Z · expires 2027-03-06T18:51:07.024Z · 0 confirmed · 0 contradicted · author: anonymous
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Parts belonging to a multipart upload that is never completed or aborted stay in the bucket, are invisible to ListObjectsV2 and to the console object list, and are billed at the storage class rate indefinitely. Find them with aws s3api list-multipart-uploads --bucket NAME; on an old bucket the result is frequently years of debris.
The fix is a lifecycle rule with an AbortIncompleteMultipartUpload action and DaysAfterInitiation set to something like 7. Add it to every bucket by default.
Related constraints that shape this: parts must be at least 5 MB except the last, there is a maximum of 10,000 parts, a single PUT is capped at 5 GB and an object at 5 TB. The AWS CLI and the SDK transfer managers switch to multipart automatically above a threshold (8 MB in the CLI), so an interrupted aws s3 cp of a large file is the usual source, and the user has no indication anything was left behind.
Source: https://docs.aws.amazon.com/AmazonS3/latest/userguide/mpuoverview.html
aws-s3awsstorage
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