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From jzhang <jzh...@wellington.com>
Subject Can I can run two brokers as network using multicast on the same host?
Date Thu, 05 Aug 2010 21:23:26 GMT

I am trying to set up a simple network of brokers within the same host (Linux
VM) using multicast. It seems that I can only use 'localhost' as host name
in tcp uri. If I use IP address or DNS name, the log shows 'connection
refused' warning message. Here are some details:

My configurations:

- for broker NB-BKR-B:
...
 <networkConnectors>
            <networkConnector name="labnb1"
uri="multicast://default?group=test-lab-1" />
 </networkConnectors>

...
   <transportConnectors>
            <transportConnector name="openwire"
uri="tcp://myhost.mycompany.com:61617"
discoveryUri="multicast://default?group=test-lab-1"/>
        </transportConnectors>
...

- for broker NB-BKR-C:
...
 <networkConnectors>
            <networkConnector name="labnb1"
uri="multicast://default?group=test-lab-1" />
 </networkConnectors>

...
   <transportConnectors>
            <transportConnector name="openwire"
uri="tcp://myhost.mycompany.com:61618"
discoveryUri="multicast://default?group=test-lab-1"/>
        </transportConnectors>
...

Now when started both brokers, log shows (NB-BKR-C;s log):

2010-08-05 17:06:29,054 | WARN  | Could not start network bridge between:
vm://NB-BKR-C and: tcp://lab-2:61617 due to: java.net.ConnectException:
Connection refused | org.apache.activemq.network.DiscoveryNetworkConnector |
Notifier-MulticastDiscoveryAgent-listener:DiscoveryNetworkConnector:labnb1:BrokerService[NB-BKR-C]
2010-08-05 17:06:29,055 | DEBUG | Start failure exception:
java.net.ConnectException: Connection refused |
org.apache.activemq.network.DiscoveryNetworkConnector |
Notifier-MulticastDiscoveryAgent-listener:DiscoveryNetworkConnector:labnb1:BrokerService[NB-BKR-C]
java.net.ConnectException: Connection refused
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
        at
java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at java.net.Socket.connect(Socket.java:519)
        at
org.apache.activemq.transport.tcp.TcpTransport.connect(TcpTransport.java:436)
        at
org.apache.activemq.transport.tcp.TcpTransport.doStart(TcpTransport.java:402)
        at
org.apache.activemq.util.ServiceSupport.start(ServiceSupport.java:53)
        at
org.apache.activemq.transport.TransportFilter.start(TransportFilter.java:57)
        at
org.apache.activemq.transport.TransportFilter.start(TransportFilter.java:57)
        at
org.apache.activemq.transport.WireFormatNegotiator.start(WireFormatNegotiator.java:72)
        at
org.apache.activemq.transport.TransportFilter.start(TransportFilter.java:57)
        at
org.apache.activemq.transport.TransportFilter.start(TransportFilter.java:57)
        at
org.apache.activemq.network.DemandForwardingBridgeSupport.start(DemandForwardingBridgeSupport.java:227)
        at
org.apache.activemq.network.DiscoveryNetworkConnector.onServiceAdd(DiscoveryNetworkConnector.java:130)
        at
org.apache.activemq.transport.discovery.multicast.MulticastDiscoveryAgent$2.run(MulticastDiscoveryAgent.java:506)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
        at java.lang.Thread.run(Thread.java:595)

Broker NB-BKR-B has the similar warning. I have not test message forward
yet. Just feel uncomfortable seeing these stacktraces. But when I change
'myhost.mycompany.com' to localhost' under 'tcp' uri, the log does not have
those warning and stacktrace. Also if these two brokers are hosted on two
different VMs and uses host name or IP, it works fine.

What might be the problem here?

-J
-- 
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