没有一个指定的端点可达

Question

从 .net 应用程序发布消息时，rabbitmq 中存在间歇性问题。它在系统中产生大量噪音。我试过谷歌搜索，但找不到问题的根本原因。

这是我在应用程序日志中看到的错误，

None of the specified endpoints were reachable
Endpoints attempted:
------------------------------------------------
endpoint=amqp-0-9://localhost:5672, attempts=1
System.TimeoutException: Connection to amqp-0-9://localhost:5672 timed out
   at RabbitMQ.Client.Impl.SocketFrameHandler_0_9.Connect(TcpClient socket, AmqpTcpEndpoint endpoint, Int32 timeout)
   at RabbitMQ.Client.Impl.SocketFrameHandler_0_9..ctor(AmqpTcpEndpoint endpoint, ObtainSocket socketFactory, Int32 timeout)
   at RabbitMQ.Client.Framing.Impl.v0_9_1.ProtocolBase.CreateFrameHandler(AmqpTcpEndpoint endpoint, ObtainSocket socketFactory, Int32 timeout)
   at RabbitMQ.Client.ConnectionFactory.FollowRedirectChain(Int32 maxRedirects, IDictionary`2 connectionAttempts, IDictionary`2 connectionErrors, AmqpTcpEndpoint[]& mostRecentKnownHosts, AmqpTcpEndpoint endpoint)
================================================
Stack trace:
   at RabbitMQ.Client.ConnectionFactory.CreateConnection(Int32 maxRedirects)
   at RabbitMQ.Client.ConnectionFactory.CreateConnection()

Answer 1

我通过将 RabbitMQ Connection 对象设置为单例来解决这个问题，以确保重用连接而不是每次都建立新连接。