获取 EntityTooSmall 异常答案

【问题标题】：Getting EntityTooSmall Exception获取 EntityTooSmall 异常
【发布时间】：2018-08-18 02:24:26
【问题描述】：

我正在尝试以块的形式从 Azure blob 下载数据，然后尝试将相同的块上传到 aws s3 存储桶。上传时我收到"Your proposed upload is smaller than the minimum allowed size"exception。我注意到一件事，在上传响应中，我得到的内容长度为 0。我正在尝试的数据大小超过 300MB。任何指针这里可能有什么问题？下面是我的代码 sn-p ：

            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);

【问题讨论】：

您尝试在 S3 中上传的分段大小/块大小是多少？
@GauravMantri 50 MB
代码中的哪一行出现错误？
@GauravMantri client.CompleteMultipartUpload(completeRequest);抛出错误
PartSize = ms.Length?这似乎不对。这似乎应该是PartSize = blockSize，不是吗？

标签： amazon-web-services azure amazon-s3

【解决方案1】：

在敲了很多头之后，我得到了解决方案。在将部分上传到 AWS 之前的第 2 步中，我们应该将流位置设置为 0。

uploadRequest.InputStream.Position = 0;

【讨论】：