我正在尝试使用以下代码连接到tcp：//datafeeds.networkrail.co.uk：61619以接收消息。代码在没有故障转移的情况下工作正常（使用以下代码中的url1），但是当我尝试添加故障转移功能（使用以下代码中的url）时，连接仍然失败。从调试信息看，activemq无法为URI查找INetAddress。什么是INetAddress以及可能导致问题的原因？我现在比较困惑。请问有谁可以解释如何解决这个问题？
致以最诚挚的问候，
以下是代码：
import javax.jms.*;
import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.log4j.BasicConfigurator;
public class Consumer {
// URL of the JMS server
private static String url = "failover://(tcp://datafeeds.networkrail.co.uk:61619)";
private static String url1 = "tcp://datafeeds.networkrail.co.uk:61619";
private static String username = "my username";
private static String password = "my password";
private static String topic = "*";
public static void main(String[] args) throws JMSException {
BasicConfigurator.configure();
// Getting JMS connection from the server
ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(url);
Connection connection = connectionFactory.createConnection(username,password);
connection.start();
Session session = connection.createSession(false,
Session.AUTO_ACKNOWLEDGE);
Destination destination = session.createTopic(topic);
MessageConsumer consumer = session.createConsumer(destination);
while (true)
{
//System.out.println("Waiting for message...");
Message message = consumer.receive();
if (message != null && message instanceof TextMessage) {
TextMessage txtMsg = (TextMessage)message;
System.out.println("Received: " + txtMsg.getText());
}
}
//System.out.println("Closing connection");
//consumer.close();
//session.close();
//connection.close();
}}
以下是来自activemq的调试信息。
0 [main] DEBUG org.apache.activemq.thread.TaskRunnerFactory - Initialized TaskRunnerFactory[ActiveMQ Task] using ExecutorService: java.util.concurrent.ThreadPoolExecutor@471ed915[Running, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0]
2 [main] DEBUG org.apache.activemq.transport.failover.FailoverTransport - Reconnect was triggered but transport is not started yet. Wait for start to connect the transport.
135 [main] DEBUG org.apache.activemq.transport.failover.FailoverTransport - Started unconnected
135 [main] DEBUG org.apache.activemq.transport.failover.FailoverTransport - Waking up reconnect task
137 [ActiveMQ Task-1] DEBUG org.apache.activemq.transport.failover.FailoverTransport - urlList connectionList:[tcp://datafeeds.networkrail.co.uk:61619], from: [tcp://datafeeds.networkrail.co.uk:61619]
214 [ActiveMQ Task-1] DEBUG org.apache.activemq.transport.failover.FailoverTransport - Attempting 0th connect to: tcp://datafeeds.networkrail.co.uk:61619
284 [ActiveMQ Task-1] DEBUG org.apache.activemq.transport.WireFormatNegotiator - Sending: WireFormatInfo { version=10, properties={MaxFrameSize=9223372036854775807, CacheSize=1024, CacheEnabled=true, SizePrefixDisabled=false, MaxInactivityDurationInitalDelay=10000, TcpNoDelayEnabled=true, MaxInactivityDuration=30000, TightEncodingEnabled=true, StackTraceEnabled=true}, magic=[A,c,t,i,v,e,M,Q]}
291 [ActiveMQ Task-1] DEBUG org.apache.activemq.transport.failover.FailoverTransport - Connection established
292 [ActiveMQ Task-1] INFO org.apache.activemq.transport.failover.FailoverTransport - Successfully connected to tcp://datafeeds.networkrail.co.uk:61619
314 [ActiveMQ Transport: tcp://datafeeds.networkrail.co.uk/176.34.248.27:61619@50427] DEBUG org.apache.activemq.transport.InactivityMonitor - Using min of local: WireFormatInfo { version=10, properties={MaxFrameSize=9223372036854775807, CacheSize=1024, CacheEnabled=true, SizePrefixDisabled=false, MaxInactivityDurationInitalDelay=10000, TcpNoDelayEnabled=true, MaxInactivityDuration=30000, TightEncodingEnabled=true, StackTraceEnabled=true}, magic=[A,c,t,i,v,e,M,Q]} and remote: WireFormatInfo { version=9, properties={CacheSize=1024, MaxFrameSize=9223372036854775807, CacheEnabled=true, SizePrefixDisabled=false, TcpNoDelayEnabled=true, MaxInactivityDurationInitalDelay=10000, MaxInactivityDuration=30000, TightEncodingEnabled=true, StackTraceEnabled=true}, magic=[A,c,t,i,v,e,M,Q]}
317 [ActiveMQ Transport: tcp://datafeeds.networkrail.co.uk/176.34.248.27:61619@50427] DEBUG org.apache.activemq.transport.WireFormatNegotiator - Received WireFormat: WireFormatInfo { version=9, properties={CacheSize=1024, MaxFrameSize=9223372036854775807, CacheEnabled=true, SizePrefixDisabled=false, TcpNoDelayEnabled=true, MaxInactivityDurationInitalDelay=10000, MaxInactivityDuration=30000, TightEncodingEnabled=true, StackTraceEnabled=true}, magic=[A,c,t,i,v,e,M,Q]}
318 [ActiveMQ Transport: tcp://datafeeds.networkrail.co.uk/176.34.248.27:61619@50427] DEBUG org.apache.activemq.transport.WireFormatNegotiator - tcp://datafeeds.networkrail.co.uk/176.34.248.27:61619@50427 before negotiation: OpenWireFormat{version=10, cacheEnabled=false, stackTraceEnabled=false, tightEncodingEnabled=false, sizePrefixDisabled=false, maxFrameSize=9223372036854775807}
373 [ActiveMQ Transport: tcp://datafeeds.networkrail.co.uk/176.34.248.27:61619@50427] DEBUG org.apache.activemq.transport.WireFormatNegotiator - tcp://datafeeds.networkrail.co.uk/176.34.248.27:61619@50427 after negotiation: OpenWireFormat{version=9, cacheEnabled=true, stackTraceEnabled=true, tightEncodingEnabled=true, sizePrefixDisabled=false, maxFrameSize=9223372036854775807}
445 [ActiveMQ Transport: tcp://datafeeds.networkrail.co.uk/176.34.248.27:61619@50427] DEBUG org.apache.activemq.transport.failover.FailoverTransport - Waking up reconnect task
747 [ActiveMQ Task-2] ERROR org.apache.activemq.transport.failover.FailoverTransport - Failed to Lookup INetAddress for URI[ nio://ec2netrailprodmaster1:61619 ] : java.net.UnknownHostException: ec2netrailprodmaster1
748 [ActiveMQ Task-2] DEBUG org.apache.activemq.transport.failover.FailoverTransport - Doing rebalance from: tcp://datafeeds.networkrail.co.uk:61619 to [nio://ec2netrailprodmaster1:61619]
774 [ActiveMQ Task-2] DEBUG org.apache.activemq.util.ThreadPoolUtils - Shutdown of ExecutorService: java.util.concurrent.ThreadPoolExecutor@1d60498d[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0] is shutdown: true and terminated: true took: 0.001 seconds.
776 [ActiveMQ Task-2] DEBUG org.apache.activemq.transport.tcp.TcpTransport - Stopping transport tcp://datafeeds.networkrail.co.uk/176.34.248.27:61619@50427
777 [ActiveMQ Task-2] DEBUG org.apache.activemq.thread.TaskRunnerFactory - Initialized TaskRunnerFactory[ActiveMQ Task] using ExecutorService: java.util.concurrent.ThreadPoolExecutor@4d1793dc[Running, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0]
779 [ActiveMQ Task-1] DEBUG org.apache.activemq.transport.tcp.TcpTransport - Closed socket Socket[addr=datafeeds.networkrail.co.uk/176.34.248.27,port=61619,localport=50427]
779 [ActiveMQ Task-2] DEBUG org.apache.activemq.util.ThreadPoolUtils - Forcing shutdown of ExecutorService: java.util.concurrent.ThreadPoolExecutor@4d1793dc[Running, pool size = 1, active threads = 0, queued tasks = 0, completed tasks = 1]
780 [ActiveMQ Task-2] DEBUG org.apache.activemq.transport.failover.FailoverTransport - Waiting 10 ms before attempting connection.
803 [ActiveMQ Task-2] DEBUG org.apache.activemq.transport.failover.FailoverTransport - Attempting 0th connect to: nio://ec2netrailprodmaster1:61619
804 [ActiveMQ Task-2] DEBUG org.apache.activemq.transport.failover.FailoverTransport - Connect fail to: nio://ec2netrailprodmaster1:61619, reason: java.net.UnknownHostException
804 [ActiveMQ Task-2] DEBUG org.apache.activemq.transport.tcp.TcpTransport - Stopping transport nio://ec2netrailprodmaster1:61619
804 [ActiveMQ Task-2] DEBUG org.apache.activemq.thread.TaskRunnerFactory - Initialized TaskRunnerFactory[ActiveMQ Task] using ExecutorService: java.util.concurrent.ThreadPoolExecutor@7e7ee722[Running, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0]
805 [ActiveMQ Task-1] DEBUG org.apache.activemq.transport.tcp.TcpTransport - Closed socket Socket[unconnected]
805 [ActiveMQ Task-2] DEBUG org.apache.activemq.util.ThreadPoolUtils - Forcing shutdown of ExecutorService: java.util.concurrent.ThreadPoolExecutor@7e7ee722[Running, pool size = 1, active threads = 0, queued tasks = 0, completed tasks = 1]
805 [ActiveMQ Task-2] DEBUG org.apache.activemq.transport.failover.FailoverTransport - Waiting 10 ms before attempting connection
815 [ActiveMQ Task-2] DEBUG org.apache.activemq.transport.failover.FailoverTransport - Waiting 20 ms before attempting connection.
835 [ActiveMQ Task-2] DEBUG org.apache.activemq.transport.failover.FailoverTransport - Attempting 1th connect to: nio://ec2netrailprodmaster1:61619
835 [ActiveMQ Task-2] DEBUG org.apache.activemq.transport.failover.FailoverTransport - Connect fail to: nio://ec2netrailprodmaster1:61619, reason: java.net.UnknownHostException
835 [ActiveMQ Task-2] DEBUG org.apache.activemq.transport.tcp.TcpTransport - Stopping transport nio://ec2netrailprodmaster1:61619
835 [ActiveMQ Task-2] DEBUG org.apache.activemq.thread.TaskRunnerFactory - Initialized TaskRunnerFactory[ActiveMQ Task] using ExecutorService: java.util.concurrent.ThreadPoolExecutor@e1ddc89[Running, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0]
836 [ActiveMQ Task-1] DEBUG org.apache.activemq.transport.tcp.TcpTransport - Closed socket Socket[unconnected]
836 [ActiveMQ Task-2] DEBUG org.apache.activemq.util.ThreadPoolUtils - Forcing shutdown of ExecutorService: java.util.concurrent.ThreadPoolExecutor@e1ddc89[Running, pool size = 1, active threads = 0, queued tasks = 0, completed tasks = 1]
836 [ActiveMQ Task-2] DEBUG org.apache.activemq.transport.failover.FailoverTransport - Waiting 20 ms before attempting connection
856 [ActiveMQ Task-2] DEBUG org.apache.activemq.transport.failover.FailoverTransport - Waiting 40 ms before attempting connection.
896 [ActiveMQ Task-2] DEBUG org.apache.activemq.transport.failover.FailoverTransport - Attempting 2th connect to: nio://ec2netrailprodmaster1:61619`enter code here`
答案 0 :(得分：1)
尝试使用
private static String url = "failover:(tcp://datafeeds.networkrail.co.uk:61619)";
答案 1 :(得分：1)
老问题我知道，但我们只是犯了它，所以我想我分享答案....
当ActiveMQ作为群集安装时，您可以按如下方式配置客户端进行连接：
private static String url = "failover://(tcp://datafeeds.networkrail.co.uk:61619)";
ActiveMQ会定期向连接的客户端发送响应以断开连接并重新建立连接。您可以在以下日志中看到这一点：
748 [ActiveMQ Task-2] DEBUG org.apache.activemq.transport.failover.FailoverTransport - 从以下地址进行重新平衡：tcp：//datafeeds.networkrail.co.uk：61619 to [nio：// ec2netrailprodmaster1：61619]
当ActiveMQ告诉客户端重新平衡并将其发送回无法到达的nio://ec2netrailprodmaster1:61619 uri时，会出现不愉快。
因此，正确的解决方法是编辑ActiveMQ配置。对于上述问题，将会出现这样的情况：
<transportConnectors>
<transportConnector name="openwire" uri="nio://ec2netrailprodmaster1:61619?maximumConnections=1000&wireFormat.maxFrameSize=104857600" rebalanceClusterClients="true"/>
</transportConnectors>
哪个应改为：
<transportConnectors>
<transportConnector name="openwire" uri="tcp://datafeeds.networkrail.co.uk:61619?maximumConnections=1000&wireFormat.maxFrameSize=104857600" rebalanceClusterClients="true"/>
</transportConnectors>
或者更具体地说，transportConnector uri应该设置为ActiveMQ实例的主机。
答案 2 :(得分：0)
旧线程，但我最近有这个问题，它可能对其他人有帮助。
我的解决方案是找到datafeeds.networkrail.co.uk的ip地址。对我来说这是54.247.175.93。
然后将其添加到您的hosts文件中，如ec2netrailprodmaster1。
所以它看起来像。
54.247.175.93 ec2netrailprodmaster1
我的完整故障转移网址就是这样。
failover:(tcp://datafeeds.networkrail.co.uk:61619)?initialReconnectDelay=1000&maxReconnectDelay=60000&warnAfterReconnectAttempts=2&"
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