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From "Eric (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-2774) Network of brokers : Multicast discovery stopped to work
Date Fri, 11 Jun 2010 15:30:51 GMT
Network of brokers : Multicast discovery stopped to work
--------------------------------------------------------

                 Key: AMQ-2774
                 URL: https://issues.apache.org/activemq/browse/AMQ-2774
             Project: ActiveMQ
          Issue Type: Bug
    Affects Versions: 5.2.0
         Environment: Linux
            Reporter: Eric


Hi everybody

I experiment a big problem with the multicast discovery algorithm, in a network of brokers
topology.
In some conditions, a broker can't reestablish a distant connection even if the distant broker
is restarted.

I have the log traces that would help to identify the origin of the problem.

When there is no discovery/connection error, I can see these 2 lines in the activemq log file

#08 Jun 2010 14:31:30,639  INFO  [Multicast Discovery Agent Notifier] org.apache.activemq.network.DiscoveryNetworkConnector
Establishing network connection between from vm://ACCLU-tpnocp04v to tcp://tpnocp09v-bus:13100?useLocalHost=false

#08 Jun 2010 14:31:30,692  INFO  [StartLocalBridge: localBroker=vm://ACCLU-tpnocp04v#26] org.apache.activemq.network.DemandForwardingBridge
Network connection between vm://ACCLU-tpnocp04v#26 and tcp://tpnocp09v-bus/10.18.126.28:13100(MOM-tpnocp09v)
has been established.


When the connection is broken, I can see this line in the log.

#11 Jun 2010 12:37:32,585  INFO  [Multicast Discovery Agent Notifier] org.apache.activemq.network.DemandForwardingBridge
ACCLU-tpnocp04v bridge to MOM-tpnocp09v stopped


Then the current ACCLU-tpnocp04v broker tries to reestablish the connection :

#11 Jun 2010 12:37:34,475  INFO  [Multicast Discovery Agent Notifier] org.apache.activemq.network.DiscoveryNetworkConnector
Establishing network connection between from vm://ACCLU-tpnocp04v to tcp://tpnocp09v-bus:13100?useLocalHost=false

But, here, the second line of the log ("has been established") doesn't appear in the log file
!! I don't know exactly if the connection is up or not.

Then the connection is broken again (look at "Unknown" instead of "MOM-tpnocp09v".

#11 Jun 2010 13:33:58,655  WARN  [ActiveMQ Transport: tcp://tpnocp09v-bus/10.18.126.28:13100]
org.apache.activemq.network.DemandForwardingBridge
Network connection between vm://ACCLU-tpnocp04v#58 and tcp://tpnocp09v-bus/10.18.126.28:13100
shutdown due to a remote error: java.net.SocketException: Connection reset
#11 Jun 2010 13:33:58,657  INFO  [NetworkBridge] org.apache.activemq.network.DemandForwardingBridge^M
ACCLU-tpnocp04v bridge to Unknown stopped

And, now, even if I restart the distant broker ( MOM-tpnocp09v ), no line (Establishing/Has
been established) appears, and no network connection is reestablished between ACCLU-tpnocp04v
and MOM-tpnocp09v. it seems that this ACCLU-tpnocp04v broker can no longer establish a connection
with the MOM-tpnocp09v broker !!!

The production teams tell me that this problem seems not to be resolved in fuse-5.3.0.6 version.

Eric-AWL



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