amazon-web-services - 获取 EntityTooSmall 异常

Question

我正在尝试从 Azure blob 中下载数据 block ，然后尝试将相同的 block 上传到 aws s3 存储桶。上传时，我收到“您建议的上传大小小于允许的最小大小”异常。我注意到一件事，在上传响应中我得到的内容长度为 0。我尝试的数据大小超过 300MB。有任何指示这里可能有什么问题吗？下面是我的代码片段:

            var remainingLength = blob.Properties.Length;
            long startPosition = 0;
            List<UploadPartResponse> uploadResponses = new List<UploadPartResponse>();
            int i = 1;
            string uploadId = string.Empty;

            //Step 1: build and send a multi upload request
            var initiateRequest = new InitiateMultipartUploadRequest
            {
                BucketName = existingBucketName,
                Key = "firstobj"
            };

            var initResponse = client.InitiateMultipartUpload(initiateRequest);
            uploadId = initResponse.UploadId;

            do
            {
                var blockSize = Math.Min(segmentSize, remainingLength);
                using (var ms = new MemoryStream())
                {
                    blob.DownloadRangeToStream(ms, startPosition, blockSize);

                    //Step 2: upload each chunk (this is run for every chunk unlike the other steps which are run once)
                    var uploadRequest = new UploadPartRequest
                    {
                        BucketName = existingBucketName,
                        Key = "firstobj",
                        UploadId = uploadId,
                        PartNumber = i,
                        PartSize = ms.Length,
                        InputStream = ms
                    };

                    // Upload part and add response to our list.
                    var temp = client.UploadPart(uploadRequest);
                    uploadResponses.Add(temp);
                }

                //Step 3: build and send the multipart complete request
                if (blockSize < segmentSize)
                {

                    var completeRequest = new CompleteMultipartUploadRequest
                    {
                        BucketName = existingBucketName,
                        Key = "firstobj",
                        UploadId = uploadId,
                    };

                    completeRequest.AddPartETags(uploadResponses);    
                    client.CompleteMultipartUpload(completeRequest);
                }

                startPosition += blockSize;
                remainingLength -= blockSize;
                i++;
            }
            while (remainingLength > 0);

Answer 1

经过一番努力之后，我找到了解决方案。在第 2 步中，在将部分上传到 AWS 之前，我们应该将流位置设置为 0。

uploadRequest.InputStream.Position = 0;