mosche commented on a change in pull request #16987:
URL: https://github.com/apache/beam/pull/16987#discussion_r819472165



##########
File path: 
sdks/java/io/amazon-web-services2/src/main/java/org/apache/beam/sdk/io/aws2/s3/S3FileSystem.java
##########
@@ -548,12 +554,15 @@ CompleteMultipartUploadResponse multipartCopy(
                         Math.min(objectSize - 1, bytePosition + 
uploadBufferSizeBytes - 1)))

Review comment:
       I can't find any good recommendations regarding part sizes of multipart 
copy... my gut feeling is that using the max possible we're on the other far 
end.  But it should be fine.
   Have you been able to run some tests against S3 @spatel11?




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