Aborting Incomplete Multipart Uploads Using a Bucket Lifecycle Policy

If you don’t send the complete multipart upload request successfully, Amazon S3 will not assemble the parts and will not create any object. Therefore, the parts remain in Amazon S3 and you pay for the parts that are stored in Amazon S3. As a best practice, we recommend you configure a lifecycle rule (using the Abort Incomplete Multipart Upload action) to minimize your storage costs.lifecycle

We are adding two rules that will give you additional control over two special types of objects: incomplete multipart uploads and expired object delete markers.

Incomplete Multipart Uploads – S3’s multipart upload feature accelerates the uploading of large objects by allowing you to split them up into logical parts that can be uploaded in parallel.  If you initiate a multipart upload but never finish it, the in-progress upload occupies some storage space and will incur storage charges. However, these uploads are not visible when you list the contents of a bucket and (until today’s release) had to be explicitly removed.

Expired Object Delete Markers – S3’s versioning feature allows you to preserve, retrieve, and restore every version of every object stored in a versioned bucket. When you delete a versioned object, a delete marker is created. If all previous versions of the object subsequently expire, an expired object delete marker is left. These markers do not incur storage charges. However, removing unneeded delete markers can improve the performance of S3’s LIST operation.

Open the console and navigating to the desired bucket (mine is called dinfratechsource1)

Then click on Properties, open up the Lifecycle section, and click on Add rule:

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Select the desired storage class if applicable and click next

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Then enable the new rule and select the desired expiration period:

As a best practice, we recommend that you enable this setting even if you are not sure that you are actually making use of multipart uploads. Some applications will default to the use of multipart uploads when uploading files above a particular, application-dependent, size.

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Review the lifecycle policy and click on save.

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Amazon S3 Multipart Upload Limits

Item Specification
Maximum object size 5 TB
Maximum number of parts per upload 10,000
Part numbers 1 to 10,000 (inclusive)
Part size 5 MB to 5 GB, last part can be < 5 MB
Maximum number of parts returned for a list parts request 1000
Maximum number of multipart uploads returned in a list multipart uploads request 1000

 

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