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S3 InvalidPart error encountered during multipart upload.

One or more of the specified parts could not be found in the multipart upload.

Understanding Amazon S3 and Its Purpose

Amazon Simple Storage Service (S3) is a scalable object storage service provided by AWS. It is designed to store and retrieve any amount of data from anywhere on the web. S3 is commonly used for backup and restore, data archiving, and as a data lake for analytics.

Identifying the InvalidPart Error

When working with Amazon S3, you might encounter the InvalidPart error during a multipart upload. This error indicates that one or more of the specified parts could not be found in the multipart upload process.

What is Observed?

During a multipart upload, you may receive an error message stating: "The part number you specified could not be found. Please ensure that the part number is correct and that the part has been uploaded."

Explaining the InvalidPart Issue

The InvalidPart error occurs when there is a mismatch between the parts specified in the upload request and the parts that have been successfully uploaded to S3. This can happen due to incorrect part numbers or missing parts.

Common Causes

  • Incorrect part numbers specified in the upload request.
  • Parts not uploaded successfully before completing the multipart upload.
  • Network interruptions causing incomplete uploads.

Steps to Resolve the InvalidPart Error

To resolve the InvalidPart error, follow these steps:

Step 1: Verify Part Numbers

Ensure that the part numbers specified in your complete multipart upload request match the part numbers of the uploaded parts. You can list the parts using the AWS CLI:

aws s3api list-parts --bucket <bucket-name> --key <object-key> --upload-id <upload-id>

Step 2: Check Uploaded Parts

Verify that all parts have been uploaded successfully. If any parts are missing, re-upload them using the following command:

aws s3api upload-part --bucket <bucket-name> --key <object-key> --part-number <part-number> --upload-id <upload-id> --body <file-path>

Step 3: Complete the Multipart Upload

Once all parts are verified and uploaded, complete the multipart upload:

aws s3api complete-multipart-upload --bucket <bucket-name> --key <object-key> --upload-id <upload-id> --multipart-upload file://<json-file>

Additional Resources

For more information on multipart uploads, refer to the AWS S3 Multipart Upload Overview. If you encounter further issues, consult the CompleteMultipartUpload API Documentation.

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