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From "Krzysztof Olszewski (JIRA)" <j...@apache.org>
Subject [jira] Commented: (AMQ-2774) Network of brokers : Multicast discovery stopped to work
Date Tue, 27 Jul 2010 15:27:54 GMT

    [ https://issues.apache.org/activemq/browse/AMQ-2774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=60941#action_60941
] 

Krzysztof Olszewski commented on AMQ-2774:
------------------------------------------

I've encountered similar problem though in a different case.
Imho it is far more easily reproducible.
The case is when you try to add a DiscoveryNetworkConnector between the brokers with a TCP
connection set to the broker that has SSL enabled [not TCP].

The operation is blocking [on a DemandForwardingBridgeSupport.start() -> remoteBrokerNameKnownLatch.await();
operation] and new threads are being created, all blocked on the same operation :
DiscoveryNetworkConnector.onServiceAdd()
DemandForwardingBridgeSupport.start()
CountDownLatch.await().

Here are the logs that appears during the situation described above:
https://issues.apache.org/activemq/secure/attachment/19504/activemq-bug-2774-tcpToSsl.log

> 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
>            Assignee: Gary Tully
>             Fix For: 5.4.1
>
>         Attachments: activemq-bug-2774-tcpToSsl.log, AMQ2774.tar, JMAC-BEA-lastlog.log-20100315,
SocketTstFactory.java
>
>
> 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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