java - Blobstore/FileService 写入突然 100% 失败

Question

它已经工作了好几个星期，今天中午也工作得很好，然后(没有任何部署/更改)它突然开始 100% 失败。对于昨天有效但在开发中仍然正常工作的相同 URL，它在生产中失败了。

我认为这是某种服务中断，但 App Engine 状态页面显示全绿色。

这是堆栈跟踪:

java.io.IOException
at com.google.appengine.api.files.FileServiceImpl.translateException(FileServiceImpl.java:588)
at com.google.appengine.api.files.FileServiceImpl.makeSyncCall(FileServiceImpl.java:561)
at com.google.appengine.api.files.FileServiceImpl.create(FileServiceImpl.java:479)
at com.google.appengine.api.files.FileServiceImpl.createNewBlobFile(FileServiceImpl.java:99)
at com.google.appengine.api.files.FileServiceImpl.createNewBlobFile(FileServiceImpl.java:81)
at mikelike.common.Image.getImageFromUrl(Image.java:303)
at mikelike.account.PinFactory.createPin(PinFactory.java:251)
at org.apache.jsp.WEB_002dINF.ml.account.add_jsp._jspService(add_jsp.java:123)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:390)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:327)
at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126)
at mikelike.common.HideJspServlet.doGet(HideJspServlet.java:24)
at mikelike.common.HideJspServlet.doPost(HideJspServlet.java:31)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at mikelike.common.MikeLikeServletFilter.doFilter(MikeLikeServletFilter.java:190)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:102)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:249)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:135)
at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:422)
at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:449)
at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:455)
at com.google.tracing.TraceContext.runInContext(TraceContext.java:695)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:333)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:325)
at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:453)
at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251)
at java.lang.Thread.run(Thread.java:679)
Caused by: com.google.apphosting.api.ApiProxy$ApplicationException: ApplicationError: 1:
at java.lang.Thread.getStackTrace(Thread.java:1495)
at com.google.apphosting.runtime.ApiProxyImpl.doSyncCall(ApiProxyImpl.java:235)
at com.google.apphosting.runtime.ApiProxyImpl.access$000(ApiProxyImpl.java:68)
at com.google.apphosting.runtime.ApiProxyImpl$1.run(ApiProxyImpl.java:180)
at com.google.apphosting.runtime.ApiProxyImpl$1.run(ApiProxyImpl.java:178)
at java.security.AccessController.doPrivileged(Native Method)
at com.google.apphosting.runtime.ApiProxyImpl.makeSyncCall(ApiProxyImpl.java:178)
at com.google.apphosting.runtime.ApiProxyImpl.makeSyncCall(ApiProxyImpl.java:68)
at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:101)
at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:50)
at com.google.appengine.api.files.FileServiceImpl.makeSyncCall(FileServiceImpl.java:557)
... 52 more
Caused by: com.google.apphosting.api.ApiProxy$ApplicationException: ApplicationError: 1:
at com.google.apphosting.runtime.ApiProxyImpl$AsyncApiFuture.failure(ApiProxyImpl.java:544)
at com.google.net.rpc3.client.RpcStub$RpcCallbackDispatcher$1.runInContext(RpcStub.java:748)
at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:455)
at com.google.tracing.TraceContext.runInContext(TraceContext.java:695)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:333)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:325)
at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:453)
at com.google.net.rpc3.client.RpcStub$RpcCallbackDispatcher.rpcFinished(RpcStub.java:788)
at com.google.net.rpc3.client.RpcStub$RpcCallbackDispatcher.failure(RpcStub.java:779)
at com.google.net.rpc3.impl.client.RpcClientInternalContext.runCallbacks(RpcClientInternalContext.java:890)
at com.google.net.rpc3.impl.client.RpcClientInternalContext.finishRpcAndNotifyApp(RpcClientInternalContext.java:793)
at com.google.net.rpc3.impl.client.RpcNetChannel.afterFinishingActiveRpc(RpcNetChannel.java:1049)
at com.google.net.rpc3.impl.client.RpcNetChannel.finishRpc(RpcNetChannel.java:895)
at com.google.net.rpc3.impl.client.RpcNetChannel.handleResponse(RpcNetChannel.java:2248)
at com.google.net.rpc3.impl.client.RpcNetChannel.messageReceived(RpcNetChannel.java:2060)
at com.google.net.rpc3.impl.client.RpcNetChannel.access$2000(RpcNetChannel.java:147)
at com.google.net.rpc3.impl.client.RpcNetChannel$TransportCallback.receivedMessage(RpcNetChannel.java:3097)
at com.google.net.rpc3.impl.client.RpcChannelTransportData$TransportCallback.receivedMessage(RpcChannelTransportData.java:602)
at com.google.net.rpc3.impl.wire.RpcBaseTransport.receivedMessage(RpcBaseTransport.java:420)
at com.google.net.rpc3.impl.wire.RpcClientTcpTransport.parseOneMessage(RpcClientTcpTransport.java:773)
at com.google.net.rpc3.impl.wire.RpcClientTcpTransport.parseMessages(RpcClientTcpTransport.java:651)
at com.google.net.rpc3.impl.wire.RpcClientTcpTransport.access$100(RpcClientTcpTransport.java:38)
at com.google.net.rpc3.impl.wire.RpcClientTcpTransport$1.dataReceived(RpcClientTcpTransport.java:293)
at com.google.net.async3.SocketConnection.handleNetworkReadEvent(SocketConnection.java:843)
at com.google.net.async3.SocketConnection.access$400(SocketConnection.java:40)
at com.google.net.async3.SocketConnection$NetworkReadHandlerImpl.run(SocketConnection.java:872)
at com.google.net.eventmanager.AbstractFutureTask$Sync.innerRun(AbstractFutureTask.java:260)
at com.google.net.eventmanager.AbstractFutureTask.run(AbstractFutureTask.java:121)
at com.google.net.eventmanager.EventManagerImpl.runTask(EventManagerImpl.java:576)
at com.google.net.eventmanager.EventManagerImpl.internalRunWorkerLoop(EventManagerImpl.java:997)
at com.google.net.eventmanager.EventManagerImpl.runWorkerLoop(EventManagerImpl.java:878)
at com.google.net.eventmanager.WorkerThreadInfo.runWorkerLoop(WorkerThreadInfo.java:134)
at com.google.net.eventmanager.EventManagerImpl$WorkerThread.run(EventManagerImpl.java:1833) 

有人对调试或让 Google 工程人员关注它有什么建议吗？还有其他人遇到过这种情况吗？

这是我的代码，以防它有助于将事情放在上下文中。

URL url = new URL(urlString);
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setConnectTimeout(10000);
conn.setReadTimeout(15000);

String contentType = conn.getContentType();

InputStream is = conn.getInputStream();

FileService fileService = FileServiceFactory.getFileService();
AppEngineFile file = fileService.createNewBlobFile(contentType);
FileWriteChannel writeChannel = fileService.openWriteChannel(file, true);

int nRead;
byte[] data = new byte[8192];
while ((nRead = is.read(data, 0, data.length)) != -1) {
    writeChannel.write(ByteBuffer.wrap(data,0,nRead));
}

writeChannel.closeFinally();
BlobKey blobKey = fileService.getBlobKey(file);

Answer 1

我在 appengine 论坛上回复了您的帖子 - 本质上，文件 API 目前处于实验阶段。虽然我们正在努力提高其可靠性，使其摆脱实验状态，但在关键任务代码路径中使用它时应小心。

我观察到，很多时候它会因 DeadlineExceeded 错误而失败 - 也许您可以编写代码以在发生这种情况时重试该操作。