SocketTimeoutException：插入到Google云端硬盘时读取超时-是否可以重试？

Question

类似于File.insert.execute上的Java Google Drive SDK SocketTimeoutException

上载成千上万个文件，似乎每50个文件中就有1个抛出

java.net.SocketTimeoutException: Read timed out
        at java.net.SocketInputStream.socketRead0(Native Method)
        at java.net.SocketInputStream.read(SocketInputStream.java:152)
        at java.net.SocketInputStream.read(SocketInputStream.java:122)
        at sun.security.ssl.InputRecord.readFully(InputRecord.java:442)
        at sun.security.ssl.InputRecord.read(InputRecord.java:480)
        at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:927)
        at sun.security.ssl.SSLSocketImpl.readDataRecord(SSLSocketImpl.java:884)
        at sun.security.ssl.AppInputStream.read(AppInputStream.java:102)
        at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
        at java.io.BufferedInputStream.read1(BufferedInputStream.java:275)
        at java.io.BufferedInputStream.read(BufferedInputStream.java:334)
        at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:687)
        at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:633)
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1323)
        at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)
        at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:338)
        at com.google.api.client.http.javanet.NetHttpResponse.<init>(NetHttpResponse.java:36)
        at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:94)
        at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:965)
        at com.google.api.client.googleapis.media.MediaHttpUploader.executeCurrentRequestWithoutGZip(MediaHttpUploader.java:545)
        at com.google.api.client.googleapis.media.MediaHttpUploader.executeCurrentRequest(MediaHttpUploader.java:562)
        at com.google.api.client.googleapis.media.MediaHttpUploader.executeUploadInitiation(MediaHttpUploader.java:519)
        at com.google.api.client.googleapis.media.MediaHttpUploader.resumableUpload(MediaHttpUploader.java:384)
        at com.google.api.client.googleapis.media.MediaHttpUploader.upload(MediaHttpUploader.java:336)
        at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:418)
        at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:343)
        at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:460)
...

上 files().insert().execute()

我不确定插入文件时收到此异常的“含义”。

1. 这是否意味着未满足插入请求？
2. 这是否仅表示客户端在发送插入请求后没有收到Google服务器的回音？
3. 出现exponential back-off and retry此错误时该怎么办？

Answer 1

我有同样的问题。一种可能的解决方案是增加读取超时： 超时和错误

private HttpRequestInitializer setHttpTimeout(final HttpRequestInitializer requestInitializer) {
    return new HttpRequestInitializer() {
        @Override
        public void initialize(HttpRequest httpRequest) throws IOException {
            requestInitializer.initialize(httpRequest);
            httpRequest.setConnectTimeout(3 * 60000);  // 3 minutes connect timeout
            httpRequest.setReadTimeout(3 * 60000);  // 3 minutes read timeout
        }
    };
}
...
service = new Drive.Builder(HTTP_TRANSPORT, JSON_FACTORY, setHttpTimeout(credential)).build();

Answer 2

显而易见的事情就是尝试防止超时。我认为没有任何方法可以确定错误是发生在插入帖子完成之前还是之后。当 Drive 基础设施内存在内部超时时，获得 501 响应是很常见的，但您的情况有所不同。唯一确定的方法是在文件对象上设置私有属性，然后搜索云端硬盘以查看是否存在具有该属性的文件（例如 my generatedId = some_random_UUID）。

如果您同时插入数千个文件，则可能会阻塞某些资源（套接字、带宽等）。您可能想尝试稍微限制您的输入。