s3 File Uploading is so slow C#

Question

I'm using the transferUtility class to upload files into S3 using input stream in .NET. The problem is, uploading a file of 4MB takes around a minute. I tried both transferUtility.Upload and S3Client.PutObject and the upload time didn't seem to change. The code is below:

WebRequest.DefaultWebProxy = null;


this.S3Client = new Amazon.S3.AmazonS3Client(accessKeyId, secretAccessKey, endPoint);

this.transferUtility = new TransferUtility(this.S3Client);

Amazon.S3.Transfer.TransferUtilityUploadRequest transferRequest = new TransferUtilityUploadRequest();

transferRequest.BucketName = s3Bucket;

transferRequest.CannedACL = Amazon.S3.S3CannedACL.PublicRead;


transferRequest.InputStream = (Stream)fileStream;

transferRequest.Key = newFileName;

transferRequest.Headers.Expires = new DateTime(2020, 1, 1);

this.transferUtility.Upload(transferRequest);

Any help would be appreciated.

Thank you,

Answer 1

我发现发生这种情况是因为将文件流上传到应用程序服务器需要很长时间。

Answer 2

This is likely also due to the C# SDK MD5sum'ing every chunk it uploads (CPU performance hit and thus slows down the upload while an MD5Sum is computed).

See https://github.com/aws/aws-sdk-net/issues/832#issuecomment-383756520 for workaround.