method gettrend returns error

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  • April 28, 2024 at 1:39 pm #14477
    Zeus
    Participant

    Hi,
    I am trying to get a long peroid data by method gettrend such as three months.
    The server shows error info below.

    My writting peroid in influxdb is 1 second.
    I tested it. It can handle five days data. When i make it longer there will come error.

    How to make the method can handle long period and the client can get data from server without limit?

    System.AggregateException: One or more errors occurred. (A task was canceled.)
    —> System.Threading.Tasks.TaskCanceledException: A task was canceled.
    at System.Threading.Tasks.Task.GetExceptions(Boolean includeTaskCanceledExceptions)
    at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
    at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
    at Scada.Server.Modules.ModArcInfluxDb.Logic.InfluxHAL.GetFirstTrend(TimeRange timeRange, Int32[] cnlNums)
    at Scada.Server.Engine.ArchiveHolder.GetTrends(Int32 archiveBit, TimeRange timeRange, Int32[] cnlNums)
    at Scada.Server.Engine.ServerListener.GetTrends(ConnectedClient client, DataPacket request)
    at Scada.Server.ListenerBase.ProcessRequest(ConnectedClient client, DataPacket request)
    at Scada.Server.ListenerBase.ReceiveData(ConnectedClient client)
    at Scada.Server.ListenerBase.ClientExecute(Object clientArg)
    — End of stack trace from previous location —

    — End of inner exception stack trace —
    at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
    at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
    at Scada.Server.Modules.ModArcInfluxDb.Logic.InfluxHAL.GetFirstTrend(TimeRange timeRange, Int32[] cnlNums)
    at Scada.Server.Engine.ArchiveHolder.GetTrends(Int32 archiveBit, TimeRange timeRange, Int32[] cnlNums)

    April 29, 2024 at 11:55 am #14481
    Mikhail
    Moderator

    Hi,
    How many data points are expected to be returned?

    May 4, 2024 at 9:35 am #14489
    Zeus
    Participant

    there are about 12,960,000 points data

    May 6, 2024 at 9:29 am #14491
    Mikhail
    Moderator

    According to the application communication protocol, response length is limited. Data should be retrieved by several requests. Data streaming supported only for file operations.

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