Question

我尝试从云存储中读取文件时遇到"Unexpected cause of ExecutionException"错误。以下是完整的堆栈跟踪。

文件大小为20MB。

com.google.appengine.tools.cloudstorage.NonRetriableException：了java.lang.RuntimeException： com.google.appengine.tools.cloudstorage.SimpleGcsInputChannelImpl$1@ef713e： ExecutionException的意外原因在com.google.appengine.tools.cloudstorage.RetryHelper.doRetry（RetryHelper.java:120）在com.google.appengine.tools.cloudstorage.RetryHelper.runWithRetries（RetryHelper.java:166）在com.google.appengine.tools.cloudstorage.RetryHelper.runWithRetries（RetryHelper.java:156）在com.google.appengine.tools.cloudstorage.SimpleGcsInputChannelImpl.read（SimpleGcsInputChannelImpl.java:84）在DownloadAttachment.doGet（DownloadAttachment.java:194）在javax.servlet.http.HttpServlet.service（HttpServlet.java:617）在javax.servlet.http.HttpServlet.service（HttpServlet.java:717）在com.google.inject.servlet.ServletDefinition.doService（ServletDefinition.java:263）在com.google.inject.servlet.ServletDefinition.service（ServletDefinition.java:178）在com.google.inject.servlet.ManagedServletPipeline.service（ManagedServletPipeline.java:91）在com.google.inject.servlet.FilterChainInvocation.doFilter（FilterChainInvocation.java:62） at com.pw.budgeting.integration.SynchronizationMessageFilter.doFilter（SynchronizationMessageFilter.java:34）在com.google.inject.servlet.FilterDefinition.doFilter（FilterDefinition.java:163）在com.google.inject.servlet.FilterChainInvocation.doFilter（FilterChainInvocation.java:58）在com.google.inject.servlet.FilterDefinition.doFilter（FilterDefinition.java:168）在com.google.inject.servlet.FilterChainInvocation.doFilter（FilterChainInvocation.java:58）在com.google.inject.servlet.FilterDefinition.doFilter（FilterDefinition.java:168）在com.google.inject.servlet.FilterChainInvocation.doFilter（FilterChainInvocation.java:58）在com.google.inject.servlet.FilterDefinition.doFilter（FilterDefinition.java:168）在com.google.inject.servlet.FilterChainInvocation.doFilter（FilterChainInvocation.java:58）在com.google.inject.servlet.FilterDefinition.doFilter（FilterDefinition.java:168）在com.google.inject.servlet.FilterChainInvocation.doFilter（FilterChainInvocation.java:58）在com.google.inject.servlet.FilterDefinition.doFilter（FilterDefinition.java:168）在com.google.inject.servlet.FilterChainInvocation.doFilter（FilterChainInvocation.java:58）在com.google.inject.servlet.FilterDefinition.doFilter（FilterDefinition.java:168）在com.google.inject.servlet.FilterChainInvocation.doFilter（FilterChainInvocation.java:58）在com.google.inject.servlet.FilterDefinition.doFilter（FilterDefinition.java:168）在com.google.inject.servlet.FilterChainInvocation.doFilter（FilterChainInvocation.java:58）在com.google.inject.servlet.FilterDefinition.doFilter（FilterDefinition.java:168）在com.google.inject.servlet.FilterChainInvocation.doFilter（FilterChainInvocation.java:58）在com.google.inject.servlet.FilterDefinition.doFilter（FilterDefinition.java:168）在com.google.inject.servlet.FilterChainInvocation.doFilter（FilterChainInvocation.java:58）在com.google.inject.servlet.FilterDefinition.doFilter（FilterDefinition.java:168）在com.google.inject.servlet.FilterChainInvocation.doFilter（FilterChainInvocation.java:58）在com.google.inject.servlet.FilterDefinition.doFilter（FilterDefinition.java:168）在com.google.inject.servlet.FilterChainInvocation.doFilter（FilterChainInvocation.java:58）在com.google.inject.servlet.FilterDefinition.doFilter（FilterDefinition.java:168）在com.google.inject.servlet.FilterChainInvocation.doFilter（FilterChainInvocation.java:58） at com.pw.features.FeatureFilter.doFilter（FeatureFilter.java:39）在com.google.inject.servlet.FilterDefinition.doFilter（FilterDefinition.java:163）在com.google.inject.servlet.FilterChainInvocation.doFilter（FilterChainInvocation.java:58）在com.pw.security.AuthenticationFilter.doFilter（AuthenticationFilter.java:43）在com.google.inject.servlet.FilterDefinition.doFilter（FilterDefinition.java:163）在com.google.inject.servlet.FilterChainInvocation.doFilter（FilterChainInvocation.java:58）在com.pw.security.SchemaFilter.doFilter（SchemaFilter.java:36）在com.google.inject.servlet.FilterDefinition.doFilter（FilterDefinition.java:163）在com.google.inject.servlet.FilterChainInvocation.doFilter（FilterChainInvocation.java:58）在com.google.inject.servlet.ManagedFilterPipeline.dispatch（ManagedFilterPipeline.java:118）在com.google.inject.servlet.GuiceFilter.doFilter（GuiceFilter.java:113）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter（ParseBlobUploadFilter.java:125）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter（SaveSessionFilter.java:37）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter（JdbcMySqlConnectionCleanupFilter.java:60）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter（TransactionCleanupFilter.java:50）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在org.mortbay.jetty.servlet.ServletHandler.handle（ServletHandler.java:388）在org.mortbay.jetty.security.SecurityHandler.handle（SecurityHandler.java:216）在org.mortbay.jetty.servlet.SessionHandler.handle（SessionHandler.java:182）在org.mortbay.jetty.handler.ContextHandler.handle（ContextHandler.java:765）在org.mortbay.jetty.webapp.WebAppContext.handle（WebAppContext.java:418）在com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle（AppVersionHandlerMap.java:260）在org.mortbay.jetty.handler.HandlerWrapper.handle（HandlerWrapper.java:152）在org.mortbay.jetty.Server.handle（Server.java:326）在org.mortbay.jetty.HttpConnection.handleRequest（HttpConnection.java:542） at org.mortbay.jetty.HttpConnection $ RequestHandler.headerComplete（HttpConnection.java:923）在com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable（RpcRequestParser.java:78）在org.mortbay.jetty.HttpConnection.handle（HttpConnection.java:404）在com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest（JettyServletEngineAdapter.java:148）在com.google.apphosting.runtime.JavaRuntime $ RequestRunnable.run（JavaRuntime.java:468）在com.google.tracing.TraceContext $ TraceContextRunnable.runInContext（TraceContext.java:437）在com.google.tracing.TraceContext $ TraceContextRunnable $ 1.run（TraceContext.java:444）在com.google.tracing.CurrentContext.runInContext（CurrentContext.java:256）在com.google.tracing.TraceContext $ AbstractTraceContextCallback.runInInheritedContextNoUnref（TraceContext.java:308）在com.google.tracing.TraceContext $ AbstractTraceContextCallback.runInInheritedContext（TraceContext.java:300）在com.google.tracing.TraceContext $ TraceContextRunnable.run（TraceContext.java:441）在com.google.apphosting.runtime.ThreadGroupPool $ PoolEntry.run（ThreadGroupPool.java:235）在java.lang.Thread.run（Thread.java:745）引起：java.lang.RuntimeException：com.google.appengine.tools.cloudstorage.SimpleGcsInputChannelImpl$1@ef713e： ExecutionException的意外原因在com.google.appengine.tools.cloudstorage.SimpleGcsInputChannelImpl $ 1.call（SimpleGcsInputChannelImpl.java:105）在com.google.appengine.tools.cloudstorage.SimpleGcsInputChannelImpl $ 1.call（SimpleGcsInputChannelImpl.java:84）在com.google.appengine.tools.cloudstorage.RetryHelper.doRetry（RetryHelper.java:108） ......还有82个原因：com.google.apphosting.api.ApiProxy $ UnknownException：API请求urlfetch.Fetch（）发生错误。在com.google.apphosting.runtime.ApiProxyImpl.statusException（ApiProxyImpl.java:650）在com.google.apphosting.runtime.ApiProxyImpl $ AsyncApiFuture.setRpcError（ApiProxyImpl.java:603）在com.google.apphosting.runtime.ApiProxyImpl $ AsyncApiFuture.failure（ApiProxyImpl.java:591）在com.google.apphosting.runtime.stubby.StubbyCallbackAdapter.failure（StubbyCallbackAdapter.java:25）在com.google.net.rpc3.client.RpcStub $ RpcCallbackDispatcher $ 1.runInContext（RpcStub.java:864）在com.google.tracing.TraceContext $ TraceContextRunnable $ 1.run（TraceContext.java:444）在com.google.tracing.CurrentContext.runInContext（CurrentContext.java:256）在com.google.tracing.TraceContext $ AbstractTraceContextCallback.runInInheritedContextNoUnref（TraceContext.java:308）在com.google.tracing.TraceContext $ AbstractTraceContextCallback.runInInheritedContext（TraceContext.java:300）在com.google.tracing.TraceContext $ TraceContextRunnable.run（TraceContext.java:441）在com.google.net.rpc3.client.RpcStub $ RpcCallbackDispatcher.runCallback（RpcStub.java:900）在com.google.net.rpc3.client.RpcStub $ RpcCallbackDispatcher.rpcFinished（RpcStub.java:910）在com.google.net.rpc3.client.RpcStub $ RpcCallbackDispatcher.failure（RpcStub.java:895）在com.google.net.rpc3.impl.client.RpcClientInternalContext.runCallbacks（RpcClientInternalContext.java:1229）在com.google.net.rpc3.impl.client.RpcClientInternalContext.finishRpcAndNotifyApp(RpcClientInternalContext.java:1126）在com.google.net.rpc3.impl.client.RpcNetChannel.afterFinishingActiveRpc(RpcNetChannel.java:1557）在com.google.net.rpc3.impl.client.RpcNetChannel.finishRpc(RpcNetChannel.java:1377）在com.google.net.rpc3.impl.client.RpcNetChannel.handleResponse（RpcNetChannel.java:3139）在com.google.net.rpc3.impl.client.RpcNetChannel.messageReceived(RpcNetChannel.java:2875）在com.google.net.rpc3.impl.client.RpcNetChannel.access 2900美元（RpcNetChannel.java:179）在com.google.net.rpc3.impl.client.RpcNetChannel $ TransportCallback.receivedMessage（RpcNetChannel.java:4081）在com.google.net.rpc3.impl.client.RpcChannelTransportData $ TransportCallback.receivedMessage（RpcChannelTransportData.java:669）在com.google.net.rpc3.impl.wire.RpcBaseTransport.receivedMessage(RpcBaseTransport.java:457）在com.google.apphosting.runtime.udrpc.UdrpcTransport $ ClientAdapter.receivedMessage（UdrpcTransport.java:338）在com.google.apphosting.runtime.udrpc.UdrpcTransport.dispatchPacket（UdrpcTransport.java:187）在com.google.apphosting.runtime.udrpc.AbstractUdrpcTransport.readPackets（AbstractUdrpcTransport.java:202）在com.google.apphosting.runtime.udrpc.AbstractUdrpcTransport.access $ 000（AbstractUdrpcTransport.java:30）在com.google.apphosting.runtime.udrpc.AbstractUdrpcTransport $ 1.run（AbstractUdrpcTransport.java:57）在com.google.net.eventmanager.AbstractFutureTask $ Sync.innerRun（AbstractFutureTask.java:260）在com.google.net.eventmanager.AbstractFutureTask.run（AbstractFutureTask.java:121）在com.google.net.eventmanager.EventManagerImpl.runTask（EventManagerImpl.java:594）在com.google.net.eventmanager.EventManagerImpl.internalRunWorkerLoop（EventManagerImpl.java:1012）在com.google.net.eventmanager.EventManagerImpl.runWorkerLoop（EventManagerImpl.java:892）在com.google.net.eventmanager.WorkerThreadInfo.runWorkerLoop（WorkerThreadInfo.java:161）在com.google.net.eventmanager.EventManagerImpl $ WorkerThread.run（EventManagerImpl.java:1877）

我的代码是：

GcsFilename keyAsAFileName = new GcsFilename(contentBucketName, key);
GcsFileMetadata gcsFileMetadata = gcsService.getMetadata(keyAsAFileName);
            ByteBuffer result = null;
            if (gcsFileMetadata != null) {
                result = ByteBuffer.allocate((int)gcsFileMetadata.getLength());
                if(gcsFileMetadata.getLength()>0){
                    readChannel = gcsService.openReadChannel(keyAsAFileName, 0);
                    readChannel.read(result);
                }
            }

请帮忙。

Answer 1

此失败的根本原因似乎是基础HTTP传输失败：“由以下原因引起：com.google.apphosting.api.ApiProxy $ UnknownException：API请求发生错误urlfetch.Fetch（）”< / p>

同样的失败是继续发生还是零星？

另外，了解更多关于它的运行方式可以提供帮助（AE经典，如果是，instance type，App Engine灵活（Java或Custom runtime）？

从Google云端存储中读取时出错

1 个答案: