mosche commented on a change in pull request #16987:
URL: https://github.com/apache/beam/pull/16987#discussion_r818814475



##########
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:
       Btw, here's docs for respective AWS limits: 
https://docs.aws.amazon.com/AmazonS3/latest/userguide/qfacts.html
   5MB is the lower limit, so things will certainly work. But performance might 
suffer




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