steveloughran commented on PR #7882:
URL: https://github.com/apache/hadoop/pull/7882#issuecomment-3444243683

   OK, this is all related to checksums on multipart puts.
   
   If you declare that checksums are always required on requests, you MUST 
define a checksum algorithm to use for multipart put, otherwise upload 
completions fail. I have no idea why, will file some SDK bug report to say 
"this is wrong" and simply change our settings to
   - checksums NOT always required
   - MD5 always enabled
   - checksum algorithm is CRC32C (will test with third party store)
   
   checksums in MPUs breaks a couple of the multipart uploader tests; more 
worried that about a ITestS3AOpenCost test failing with checksum verification 
being enabled (slow, expensive). I need to make sure that this is not an SDK 
regression.


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