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シナリオ：aiには、SFTPサーバーと接続してファイルをダウンロードするアプリがあります。これを行うコード：

while (true)
{
    try
    {
        var connectionInfo = // creating a new connection info of a Renci.SshNet lib
        var client = new SftpClient(connectionInfo);
        client.Connect();

        using (SftpFileStream sftpFileStream = client.OpenRead(path)
        {
            using (FileStream fileStream = new FileStream(filePath, FileMode.CreateNew))
            {
                int BUFFER_SIZE = 2048;
                byte[] buffer = new byte[BUFFER_SIZE];

                int readBytes = sftpFileStream.Read(buffer, 0, BUFFER_SIZE);

                while (readBytes > 0)
                {
                    fileStream.Write(buffer, 0, readBytes);
                    readBytes = sftpFileStream.Read(buffer, 0, BUFFER_SIZE);
                }
            }
        }

        client.Dispose();
    }
    catch (Exception e)
    {
        log.Error(e);
    }

    Thread.Sleep(1 hour);
}

その行client.Connect()で最初のエラーが発生しました：

Renci.SshNet.Common.SftpPathNotFoundException: No such file at Renci.SshNet.Sftp.SubsystemSession.WaitHandle(WaitHandle waitHandle, TimeSpan operationTimeout) at Renci.SshNet.Sftp.SftpSession.RequestOpen(String path, Flags flags, Boolean nullOnError) at Renci.SshNet.Sftp.SftpFileStream..ctor(SftpSession session, String path, FileMode mode, FileAccess access, Int32 bufferSize, Boolean useAsync) at Renci.SshNet.Sftp.SftpFileStream..ctor(SftpSession session, String path, FileMode mode, FileAccess access) at Renci.SshNet.SftpClient.OpenRead(String path) at Infraero.TINE3.STTColetor.Negocio.Drivers.DriverAbstratoArquivoFTP.BaixarArquivoPABXSFTP(ConfiguracaoColetor configuracaoColetor, String arquivoPABX) in D:\SVN\STT\trunk\3-0_CodigoFonte_Coletor\3-4_SRC\Infraero.TINE3.STTColetor.Negocio\Drivers\DriverAbstratoArquivoFTP.cs:line 446 at Infraero.TINE3.STTColetor.Negocio.Drivers.DriverAbstratoArquivoFTP.ProcessarArquivoSFTP(SftpFile arquivo, ConfiguracaoColetor configuracaoColetor, List'1 listaBilhetes) in D:\SVN\STT\trunk\3-0_CodigoFonte_Coletor\3-4_SRC\Infraero.TINE3.STTColetor.Negocio\Drivers\DriverAbstratoArquivoFTP.cs:line 658 at Infraero.TINE3.STTColetor.Negocio.Drivers.DriverAbstratoArquivoFTP.ColetarBilhetes(ConfiguracaoColetor configuracaoColetor, List'1 listaBilhetes, String ultimoArquivoTransmitido) in D:\SVN\STT\trunk\3-0_CodigoFonte_Coletor\3-4_SRC\Infraero.TINE3.STTColetor.Negocio\Drivers\DriverAbstratoArquivoFTP.cs:line 73 at Infraero.TINE3.STTColetor.Negocio.Coletor.ColetarBilhetes() in D:\SVN\STT\trunk\3-0_CodigoFonte_Coletor\3-4_SRC\Infraero.TINE3.STTColetor.Negocio\Coletor.cs:line 56 at Infraero.TINE3.STTColetor.WindowsService.ServicoColetor..ctor() in D:\SVN\STT\trunk\3-0_CodigoFonte_Coletor\3-4_SRC\Infraero.TINE3.STTColetor.WindowsService\ServicoColetor.cs:line 85

1時間後、プロセスはファイルのダウンロードを再試行しますが、次の行に新しいエラーが発生しますclient.Connect()。

System.Threading.Tasks.TaskSchedulerException: An exception was thrown by a TaskScheduler. ---> System.OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown. at System.Threading.Thread.StartInternal(IPrincipal principal, StackCrawlMark& stackMark) at System.Threading.Thread.Start(StackCrawlMark& stackMark) at System.Threading.Thread.Start(Object parameter) at System.Threading.Tasks.ThreadPoolTaskScheduler.QueueTask(Task task) at System.Threading.Tasks.Task.ScheduleAndStart(Boolean needsProtection) --- End of inner exception stack trace --- at System.Threading.Tasks.Task.ScheduleAndStart(Boolean needsProtection) at System.Threading.Tasks.Task.InternalStartNew(Task creatingTask, Object action, Object state, CancellationToken cancellationToken, TaskScheduler scheduler, TaskCreationOptions options, InternalTaskOptions internalOptions, StackCrawlMark& stackMark) at System.Threading.Tasks.TaskFactory.StartNew(Action action, TaskCreationOptions creationOptions) at Renci.SshNet.Session.ExecuteThread(Action action) at Renci.SshNet.Session.Connect() at Renci.SshNet.BaseClient.Connect() at Infraero.TINE3.STTColetor.Negocio.Drivers.DriverAbstratoArquivoFTP.ConectarServidorSFTP(String servidor, Int32 porta, String login, String senha) in D:\SVN\STT\trunk\3-0_CodigoFonte_Coletor\3-4_SRC\Infraero.TINE3.STTColetor.Negocio\Drivers\DriverAbstratoArquivoFTP.cs:line 551 at Infraero.TINE3.STTColetor.Negocio.Drivers.DriverAbstratoArquivoFTP.RequisitarArquivoServidorSFTP(ConfiguracaoColetor configuracaoColetor) in D:\SVN\STT\trunk\3-0_CodigoFonte_Coletor\3-4_SRC\Infraero.TINE3.STTColetor.Negocio\Drivers\DriverAbstratoArquivoFTP.cs:line 519 at Infraero.TINE3.STTColetor.Negocio.Drivers.DriverAbstratoArquivoFTP.ColetarBilhetes(ConfiguracaoColetor configuracaoColetor, List'1 listaBilhetes, String ultimoArquivoTransmitido) in D:\SVN\STT\trunk\3-0_CodigoFonte_Coletor\3-4_SRC\Infraero.TINE3.STTColetor.Negocio\Drivers\DriverAbstratoArquivoFTP.cs:line 67 at Infraero.TINE3.STTColetor.Negocio.Coletor.ColetarBilhetes() in D:\SVN\STT\trunk\3-0_CodigoFonte_Coletor\3-4_SRC\Infraero.TINE3.STTColetor.Negocio\Coletor.cs:line 56 at Infraero.TINE3.STTColetor.WindowsService.ServicoColetor..ctor() in D:\SVN\STT\trunk\3-0_CodigoFonte_Coletor\3-4_SRC\Infraero.TINE3.STTColetor.WindowsService\ServicoColetor.cs:line 85

1日後、2番目のエラーが続き、アプリのメモリ使用量が60MBから800MBに増加しました。

誰もが問題が何であるか知っていますか？

4

1 に答える 1

2

使用しているライブラリのコードベース（http://sshnet.codeplex.com/SourceControl/changeset/view/18974）をざっと見ると、SftpClientも実装されIDisposableていることがわかりますが、クリーンアップしたり閉じたりしているわけではありません。何かが失敗したとき。次のようなことを試してください。

try
{
    var connectionInfo = // something
    using(var client = new SftpClient(connectionInfo))
    {
        client.Connect();
        using(var sftpFileStream = client.OpenRead(path))
        {
            // download the file
        }
    }
}

また、使用しているライブラリ内のメモリリークの可能性もあります。

于 2012-08-30T14:09:28.583 に答える