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From "Eric (JIRA)" <j...@apache.org>
Subject [jira] Updated: (AMQ-2774) Network of brokers : Multicast discovery stopped to work
Date Tue, 27 Jul 2010 14:48:52 GMT

     [ https://issues.apache.org/activemq/browse/AMQ-2774?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eric updated AMQ-2774:
----------------------

    Attachment: SocketTstFactory.java

Hi Gary

You will find here a new version of the my own org.apache.activemq.transport.tcp.SocketTstFactory.java
far more deterministic (no random)

In fact, in this one, the duplex network connection is forcely closed in my "bagot thread",
after 0 ms, then 1 ms, then 2 ms, then ...., then 11 ms, then 31 ms, then 51 ms, then 71 ms,
.....

With my patch on the 5.3.2, and my test server, the JUNIT test succeeds (I think always),
With the 5.3.2 version, the JUNIT test doesn't succeed (I think never).

On my test server (a good one with 2 CPUs), it's when the connection is closed between 1 and
3 ms, after the connect() call that the network connector is frozen. If the close connection
is done immediately, or after 3 ms, the network connector continues to live.

I can't test on 5.4-trunk since I don't have a SVN with HTTPS support on my test server.

I hope this will help you to test on 5.4 and to validate my patch.

Eric-AWL

> 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: 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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