rabbitmq - 在rabbitmq中发生几次nack异常后超时异常

Question

我使用 rabbitmq，我想将我的队列限制为 100,000 个消息，所以我添加了这样的策略：rabbitmqctl set_policy my-pol "^two-messages$" '{"max-length":2,"overflow":"reject-publish"}' --apply-to queues

这工作正常并限制了我的队列。

现在，当我遇到 nack 异常时，我希望线程睡眠增量时间，我这样做了：

public static async Task SendMessagage(Uri queueUri, T message, IBus bus, int interval = 10 * 1000)
    {
        try
        {
            Task<ISendEndpoint> sendEndpointTask = bus.GetSendEndpoint(queueUri);
            Console.WriteLine($"Enter SendMessagage {queueUri.AbsolutePath}  interval={interval}");
            var result  = sendEndpointTask.Result;
            await result.Send(message);
            Console.WriteLine($"AFTER SEND SendMessagage {queueUri.AbsolutePath}  interval={interval}");
            interval = 10 * 1000;
        }
        catch (PublishNackException e)
        {
            Console.WriteLine($"PublishNack EXCEPTION SendMessagage {queueUri.AbsolutePath}  interval={interval}");
            interval = interval * 2;
            Thread.Sleep(interval);
            await SendMessagage(queueUri, message, bus);

        }
        catch(Exception ex)
        {
            Console.WriteLine($"EXCEPTION SendMessagage {queueUri.AbsolutePath}  interval={interval}");
            interval = interval * 2;
            Thread.Sleep(interval);
            await SendMessagage(queueUri, message, bus);
            Console.WriteLine($"EXCEPTION2 SendMessagage {queueUri.AbsolutePath}  interval={interval}");
        }
    }

但一段时间后我得到了超时异常。为什么我会收到此异常，并且有时消费者需要做出回应？

例外是：

 The model usage threw an exception
System.TimeoutException: The operation has timed out.
 at RabbitMQ.Util.BlockingCell.GetValue(TimeSpan timeout)
   at RabbitMQ.Client.Impl.SimpleBlockingRpcContinuation.GetReply(TimeSpan timeout)
   at RabbitMQ.Client.Impl.ModelBase.ModelRpc(MethodBase method, ContentHeaderBase header, Byte[] body)
   at RabbitMQ.Client.Framing.Impl.Model._Private_ChannelOpen(String outOfBand)
   at RabbitMQ.Client.Framing.Impl.Connection.CreateModel()
   at System.Threading.Tasks.Task`1.InnerInvoke()
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at MassTransit.RabbitMqTransport.Integration.RabbitMqModelCache.<>c__DisplayClass9_0.<<SendUsingNewModel>b__0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at MassTransit.RabbitMqTransport.Integration.RabbitMqModelCache.ModelScope.<Attach>d__7.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at MassTransit.RabbitMqTransport.Integration.RabbitMqModelCache.<SendUsingExistingModel>d__10.MoveNext()

我在日志文件中看到，在我抓到rabbitmq正在关闭的NackException之后不知道为什么，日志中的消息是：

13/5/2018 16:14:42.594 [Debug] (8) Closing model: 5 / "admin@192.168.153.103:5672/"

标签： rabbitmq