如何设置 EventProcessorHost 从现在开始（UTC）读取事件？

Question

我们正在使用 EventProcessorHost 从 Azure EventHubs 接收事件。我一直在尝试配置它（通过 EventProcessorOptions.InitialOffsetProvider）以从现在开始从 UTC 读取事件，但一直没有成功，但它总是从提要的开头读取。我没有保存检查点（我什至删除了创建的 BLOB 容器）。这就是我的设置方式：

DateTime startDate = DateTime.UtcNow;

var epo = new EventProcessorOptions
            {
                MaxBatchSize = 100, 
                PrefetchCount = 100, 
                ReceiveTimeOut = TimeSpan.FromSeconds(120),  
                InitialOffsetProvider = (name) => startDate  
            };

如有任何指导，我们将不胜感激。

Answer 1

我发现 blob 中的检查点文件夹仍然存在，我的应用正在考虑这一点并忽略了我在 EventProcessorOptions 中设置的日期。在我删除容器后，它开始按预期运行（计算 UTC 日期）。

Answer 2

您可以为此使用 EventProcessorOptions class 并提供设置为所需时间的偏移量。

var eventProcessorOptions = new EventProcessorOptions
{
    InitialOffsetProvider = (partitionId) => DateTime.UtcNow
};

然后您可以使用任何接受 eventProcessorOptions.

的 RegisterEventProcessAsync 重载

Answer 3

认为这在版本 2.0.0 中发生了变化 - Rajiv 的代码现在是：

var eventProcessorOptions = new EventProcessorOptions
{
    InitialOffsetProvider = (partitionId) => EventPosition.FromEnqueuedTime(DateTime.UtcNow)
};

这是一个包含完全限定类名的示例块：

    private static async Task MainAsync(string[] args)
    {
        try{
            Console.WriteLine("Registering EventProcessor...");

            string AISEhConnectionStringEndpoint = Configuration["AISEhConnectionStringEndpoint"];
            string AISEhConnectionStringSharedAccessKeyName = Configuration["AISEhConnectionStringSharedAccessKeyName"];
            string AISEhConnectionStringSharedAccessKey = Configuration["AISEhConnectionStringSharedAccessKey"];
            string EhConnectionString = $"Endpoint={AISEhConnectionStringEndpoint};SharedAccessKeyName={AISEhConnectionStringSharedAccessKeyName};SharedAccessKey={AISEhConnectionStringSharedAccessKey}";
            string AISEhEntityPath = Configuration["AISEhEntityPath"];
            string AISEhConsumerGroupName = Configuration["AISEhConsumerGroupName"];
            string AISStorageContainerName = Configuration["AISStorageContainerName"];
            string AISStorageAccountName = Configuration["AISStorageAccountName"];
            string AISStorageAccountKey = Configuration["AISStorageAccountKey"];

            string StorageConnectionString = string.Format("DefaultEndpointsProtocol=https;AccountName={0};AccountKey={1}", AISStorageAccountName, AISStorageAccountKey);

            var eventProcessorHost = new Microsoft.Azure.EventHubs.Processor.EventProcessorHost(
                AISEhEntityPath,
                AISEhConsumerGroupName,
                EhConnectionString,
                StorageConnectionString,
                AISStorageContainerName);

            var options = new Microsoft.Azure.EventHubs.Processor.EventProcessorOptions
            {
                InitialOffsetProvider = (partitionId) => Microsoft.Azure.EventHubs.EventPosition.FromEnqueuedTime(DateTime.UtcNow)
            };

            // Registers the Event Processor Host and starts receiving messages
            await eventProcessorHost.RegisterEventProcessorAsync<GetEvents>(options);

            Thread.Sleep(Timeout.Infinite);

            // Disposes of the Event Processor Host
            await eventProcessorHost.UnregisterEventProcessorAsync();
        }
        catch(Exception ex)
        {
            Console.WriteLine(ex.Message);
            NLog.LogManager.GetCurrentClassLogger().Error(ex);
            throw;
        }
    }

}

这里是我的一般设置，secrets/exact 地址被遮盖以帮助解决问题，因为我发现解决这个问题不如拔牙那么令人愉快：

"AISEhConnectionStringEndpoint": "sb://<my bus address>.servicebus.windows.net/",
"AISEhConnectionStringSharedAccessKeyName": "<my key name>",
"AISEhConnectionStringSharedAccessKey": "<yeah nah>",
"AISEhEntityPath": "<Event Hub entity path>",
"AISEhConsumerGroupName":  "<consumer group name e.g $Default>",
"AISStorageContainerName":  "<storage container name>",
"AISStorageAccountName": "<storage account name>",
"AISStorageAccountKey": "<yeah nah>",

如何设置 EventProcessorHost 从现在开始（UTC）读取事件？

How to set the EventProcessorHost to read events from now on (UTC)?

azure

azure-eventhub