S3 CompleteMultipartUpload在每个部件上传成功后失败

我今天很难将（低级别）多部分上传到AmazonS3，尽管它已经运行了好几个月了。在最后一天左右，它开始失败。我有一个80多个文件上传的队列，直到大约60个文件之后都很好，然后失败的次数比成功的次数多。从那时起，即使是单个文件队列也出现了故障。

我使用的代码基本上与文档中的低级别多部分上传示例中的代码相同，只是使用了一个do-while循环，如果失败，该循环将重试上传单个部分。只有成功的部分上传才会添加到列表中，后者作为CompleteMultipartUploadRequest的一部分添加。

尽管上传的部分从未失败过；只有在所有部件上传之后发送的CompleteMultipartUploadRequest。这是我在每次失败中看到的唯一例外，它总是源于CompleteMultipartUpload请求。

我甚至将CompleteMultipartUpload对象的创建和请求封装在一个循环中，以防S3"准备好"将这些部分连接在一起时出现问题，但即使是具有显著时间延迟的渐进后退期也无济于事。

Exception: Maximum number of retry attempts reached : 3
Exception: at Amazon.S3.AmazonS3Client.pauseOnRetry(Int32 retries, Int32 maxRetries, HttpStatusCode status, String requestAddr, WebHeaderCollection headers, Exception cause)
   at Amazon.S3.AmazonS3Client.handleRetry(S3Request userRequest, HttpWebRequest request, WebHeaderCollection respHdrs, Int64 orignalStreamPosition, Int32 retries, HttpStatusCode statusCode, Exception cause)
   at Amazon.S3.AmazonS3Client.getResponseCallback[T](IAsyncResult result)
   at Amazon.S3.AmazonS3Client.endOperation[T](IAsyncResult result)
   at Amazon.S3.AmazonS3Client.EndCompleteMultipartUpload(IAsyncResult asyncResult)
   at Amazon.S3.AmazonS3Client.CompleteMultipartUpload(CompleteMultipartUploadRequest request)

这是下面的代码。有什么建议吗？

// List to store upload part responses.
List<UploadPartResponse> uploadResponses = new List<UploadPartResponse>();
List<PartETag> uploadPartETags = new List<PartETag>();
// 1. Initialize.
InitiateMultipartUploadRequest initiateRequest = new InitiateMultipartUploadRequest()
    .WithBucketName(s3bucketName)
    .WithKey(key);
initResponse = s3Client.InitiateMultipartUpload(initiateRequest);
bwLogUploadFiles("multipart upload ID " + initResponse.UploadId);

// 2. Upload Parts.
uploadFileSize = new FileInfo(sourceFilepath).Length;
uploadTypicalPartSize = PART_SIZE_DEFAULT;      // 5 MB
uploadNumParts = uploadFileSize / uploadTypicalPartSize + 1;
Debug.WriteLine("# of parts: " + uploadNumParts);
int retryCount = 0;
long filePosition = 0;
for (int i = 1; filePosition < uploadFileSize; i++)
{
    uploadCurrentPart = i;
    //long percent = (100 * filePosition) / uploadFileSize;
    //reportUploadProgress((int)percent, filePosition);
    bwLogUploadFiles("upload part " + i + " of " + uploadNumParts);
    retryCount = 0;
    // make the part size exactly equal to the lesser of the part size (5MB) or the remaining amount
    //long tmpPartSize = Math.Min(uploadTypicalPartSize, (uploadFileSize - filePosition));      
    // per documentation examples, just make part size the same every time, even if remaining file length is bigger
    long tmpPartSize = uploadTypicalPartSize;
    // Create request to upload a part.
    UploadPartRequest uploadRequest = new UploadPartRequest()
        .WithBucketName(s3bucketName)
        .WithKey(key)
        .WithUploadId(initResponse.UploadId)
        .WithPartNumber(i)
        .WithPartSize(tmpPartSize)
        .WithFilePosition(filePosition)
        .WithFilePath(sourceFilepath)
        .WithSubscriber(transferUtilityUploadSubscriberLowLevel)
        .WithReadWriteTimeout(PART_TIMEOUT)
        .WithTimeout(UPLOAD_TIMEOUT);

    UploadPartResponse resp = null;
    // repeat the part upload until it succeeds.
    Boolean anotherPass;  
    do
    {
        anotherPass = false;  // assume everythings ok
        try {
            // Upload part
            resp = s3Client.UploadPart(uploadRequest);
            // add response to our list.
            uploadResponses.Add(resp);
            // only creating PartETag and adding to a list for testing a different way of constructing the CompleteMultipartUploadRequest at the end.
            PartETag petag = new PartETag(resp.PartNumber, resp.ETag);
            uploadPartETags.Add(petag);
            bwLogUploadFiles("upload part " + resp.PartNumber + " of " + uploadNumParts + " success. Part ETag "+resp.ETag);
        }
        catch (Exception e)
        {
            anotherPass = true; // repeat
            retryCount++;
            Debug.WriteLine(e.Message +": retry part #" + i);
            bwLogUploadFiles("upload part " + i + " of " + uploadNumParts + " FAIL.  Will retry if attempt #" + retryCount + "<"uploading part #"+i+" couldn't upload after "+MAX_RETRIES+" attempts.  Upload failed");
    filePosition += tmpPartSize;

}
//reportUploadProgress(100, uploadFileSize);

// Step 3: complete.
Boolean retryCompleteRequest = true;
Boolean completeSuccess = false;
int  completeAttempts = 0;
const int delaySecondsMultiple = 3;

// retry a few times in case it's just a timing or S3 sync or readiness issue.  Maybe giving it some time make following the part uploads will do the trick
do
{
    retryCompleteRequest = false;
    try
    {
        bwLogUploadFiles("complete the multipart upload, attempt #"+(completeAttempts+1) );
        if (completeAttempts >0)
        {
            bwLogUploadFiles("delay " + (delaySecondsMultiple * completeAttempts) + " seconds");
            Thread.Sleep(delaySecondsMultiple * 1000 * completeAttempts);       // 
        }
        Debug.WriteLine("now complete the Mulitpart Upload Request");
        CompleteMultipartUploadRequest completeRequest = new CompleteMultipartUploadRequest()
            .WithBucketName(s3bucketName)
            .WithKey(key)
            .WithUploadId(initResponse.UploadId)
            //.WithPartETags(uploadResponses)   // historically we've been attaching a List<UploadPartResponse> 
            .WithPartETags(uploadPartETags);    // for testing we're trying List<PartETag>
        CompleteMultipartUploadResponse completeUploadResponse = s3Client.CompleteMultipartUpload(completeRequest);
        completeSuccess = true;
    }
    catch (Exception e)
    {
        completeAttempts++;
        retryCompleteRequest = true;
        Console.WriteLine("Exception occurred: {0}", e.Message);
        Console.WriteLine(e.StackTrace);
        bwLogUploadFiles("Exception: " + e.Message);
        bwLogUploadFiles("Exception: " + e.StackTrace);
    }
}
while (retryCompleteRequest && completeAttempts < MAX_RETRIES);