重试上传失败的文件到AWS S3

Question

我尝试使用TransferManager.upload(String bucket, String key, File file)从Android应用程序将中等大小（约10 MB）的文件上传到我的AWS S3存储桶。以下代码偶尔有效：

CognitoCachingCredentialsProvider credentialsProvider = new CognitoCachingCredentialsProvider(...);
mTransfer = new TransferManager(credentialsProvider);
mTransfer.upload("bucket", key, file);

大约有一半的时间，这个方法效果很好。另一半的时间，由于SSLException的原因，上传失败了。S3的上传会这么不可靠吗？我应该在客户端代码中处理重试吗？

06-25 18:27:50.326: I/AmazonHttpClient(10765): Unable to execute HTTP request: Write error: ssl=0xa1ef1c00: I/O error during system call, Connection reset by peer
06-25 18:27:50.326: I/AmazonHttpClient(10765): javax.net.ssl.SSLException: Write error: ssl=0xa1ef1c00: I/O error during system call, Connection reset by peer
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at com.android.org.conscrypt.NativeCrypto.SSL_write(Native Method)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at com.android.org.conscrypt.OpenSSLSocketImpl$SSLOutputStream.write(OpenSSLSocketImpl.java:794)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at com.android.okio.Okio$1.write(Okio.java:73)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at com.android.okio.RealBufferedSink.emitCompleteSegments(RealBufferedSink.java:116)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at com.android.okio.RealBufferedSink.write(RealBufferedSink.java:44)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at com.android.okhttp.internal.http.HttpConnection$FixedLengthSink.write(HttpConnection.java:310)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at com.android.okio.RealBufferedSink.emitCompleteSegments(RealBufferedSink.java:116)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at com.android.okio.RealBufferedSink$1.write(RealBufferedSink.java:131)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at com.amazonaws.http.UrlHttpClient.write(UrlHttpClient.java:172)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at com.amazonaws.http.UrlHttpClient.writeContentToConnection(UrlHttpClient.java:129)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at com.amazonaws.http.UrlHttpClient.execute(UrlHttpClient.java:65)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:353)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:196)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:4234)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at com.amazonaws.services.s3.AmazonS3Client.putObject(AmazonS3Client.java:1644)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at com.amazonaws.mobileconnectors.s3.transfermanager.internal.UploadCallable.uploadInOneChunk(UploadCallable.java:134)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at com.amazonaws.mobileconnectors.s3.transfermanager.internal.UploadCallable.call(UploadCallable.java:126)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at com.amazonaws.mobileconnectors.s3.transfermanager.internal.UploadMonitor.upload(UploadMonitor.java:182)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at com.amazonaws.mobileconnectors.s3.transfermanager.internal.UploadMonitor.call(UploadMonitor.java:140)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at com.amazonaws.mobileconnectors.s3.transfermanager.internal.UploadMonitor.call(UploadMonitor.java:54)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at java.util.concurrent.FutureTask.run(FutureTask.java:237)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
06-25 18:27:50.326: I/AmazonHttpClient(10765):  at java.lang.Thread.run(Thread.java:818)

- Zach Rattner

Answer 1

很不幸，这通常发生在网络信号不好的情况下。您还可能遇到“无法执行HTTP请求：无法解析主机名”等错误。SDK无能为力。它内置了自动重试功能，但在网络信号不稳定的情况下，这可能会发生多次，最终SDK将放弃。您可以再次尝试请求，但是否成功取决于网络强度。

- WestonE