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c# - 无法连接kafka集群时也不例外

问题描述

当程序无法连接到 kafka 集群时，我无法得到异常。代码在控制台日志中输出异常，但我需要它抛出异常。我正在使用这个 c# 库： https ://github.com/confluentinc/confluent-kafka-dotnet 

ProducerConfig _configKafka = new ProducerConfig { BootstrapServers ="localhost:9092/" };

ProducerBuilder<string, string> _kafkaProducer = new ProducerBuilder<string, string>(_configKafka);
using (var kafkaProducer = _kafkaProducer.Build())
{

    try
    {
        var dr = kafkaProducer.ProduceAsync("Kafka_Messages", new Message<string, string> { Key = null, Value = $"message {i++}" });
        dr.Wait(TimeSpan.FromSeconds(10));

        if(dr.Exception!=null)
        {
            Console.WriteLine($"Delivery failed:");
        }

        var status = dr.Status;

        //Console.WriteLine($"Delivered '{dr.Value}' to '{dr.TopicPartitionOffset}'");
    }

    catch (ProduceException<Null, string> e)
    {
        Console.WriteLine($"Delivery failed: {e.Error.Reason}");
    }
}

以下是 confluent-kafka 在控制台中打印的错误：

%3|1565248275.024|FAIL|rdkafka#producer-1| [thrd:localhst:9092/bootstrap]: localhst:9092/bootstrap: Failed to resolve 'localhst:9092': No such host is known.  (after 2269ms in state CONNECT)
%3|1565248275.024|ERROR|rdkafka#producer-1| [thrd:localhst:9092/bootstrap]: localhst:9092/bootstrap: Failed to resolve 'localhst:9092': No such host is known.  (after 2269ms in state CONNECT)
%3|1565248275.025|ERROR|rdkafka#producer-1| [thrd:localhst:9092/bootstrap]: 1/1 brokers are down

标签： c#error-handling.net-coreapache-kafkaconfluent-platform

解决方案

要在您的应用程序中获取实际异常，您需要添加.SetErrorHandler()：

    ProducerBuilder<string, string> _kafkaProducer = new ProducerBuilder<string, string>(_configKafka);

    using (var kafkaProducer = _kafkaProducer.SetErrorHandler((producer, error) =>
                        {
                           //You can handle error right here

                        }).Build())

error.Reason包含错误信息

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