Xuanwo commented on issue #5549:
URL: https://github.com/apache/opendal/issues/5549#issuecomment-2664905567

   The problem with `ChecksumLayer` is that services have different checksum 
support, making it difficult to unify them.
   
   To make things more complex, [S3 handles 
checksums](https://docs.aws.amazon.com/AmazonS3/latest/userguide/checking-object-integrity.html)
 in two different ways: full-object checksums and part-object checksums.
   
   
   
![Image](https://github.com/user-attachments/assets/f017e935-27ab-4ef9-8b4b-9d6201c78ae6)
   
   full-object means passing the full-object checksums while calling 
`Writer::close()`, part-object checksums means that using the checksum of 
different parts to build one.


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