thinkharderdev commented on PR #6794:
URL: https://github.com/apache/arrow-rs/pull/6794#issuecomment-2506302158

   > It also is not immediately obvious when the checksums are needed or not...
   
   The AWS docs are not very helpful here but we pieced together that to write 
to an S3 bucket using multi-part with object locking enabled you need to:
   
   1. Specify the checksum algo in the initial API call to 
`CreateMultiPartUpload`
   2. Send the checksum for each part while calling `PutPart`
   3. When calling `CompleteMultipartUpload` you need to send the checksum 
again for each part that was uploaded
   
   The current implementation does 2 but not 1 or 3. 


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