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From Christian Posta <christian.po...@gmail.com>
Subject Re: Need help - Messages lost when using failover network connection with failback
Date Wed, 11 Sep 2013 19:57:01 GMT
Looked briefly at your configs...

Can you try this... for the brokers that have 2+, you can use the
masterslave: discovery agent on your network connector... check out more
details here: http://activemq.apache.org/networks-of-brokers.html

For the NC that has single URI connectons, add this to the failover
URI: ?&maxReconnectAttempts=0

If that doesn't help, update the JIRA with this info and we can take a
look..




On Wed, Sep 11, 2013 at 4:56 AM, Andy May <andrew.may@bcpsoftware.com>wrote:

> I'm using a network of brokers & am trying to get a fail-back network
> connection working (using priorityBackup=true on the connector)
>
> I'm finding that the broker does failover & failback correctly but that the
> remote broker doesn't seem to recognise that the re-established connection
> is a network connection. Because of this, it rejects messages because of
> duplicate producer-sequences (even though the producerID is different).
>
> I've logged the issue on JIRA (
> https://issues.apache.org/jira/browse/AMQ-4720
> <https://issues.apache.org/jira/browse/AMQ-4720>  ) & have attached a
> test-script + config-files + log-files there.
>
>
> /Does anyone know of any configuration changes that I could make to avoid
> this problem?
> (Or can anyone recommend a different configuration that would meet my
> needs?) /
>
>
> Details of why I'm trying this configuration:
>
>
> Use case:
>
>
> 1 central site.
> Multiple branches, each with a single branch server and multiple user PCs.
> Each branch only has 1 internet connection that is shared by branch server
> &
> PCs.
> Branch server is typically unreliable hardware & may go offline without
> notice.
> Resilience to network loss is important & so each PC & server has its own
> broker.
> Both branch server & PCs need to be able to communicate with the centre
>
> To reduce the number of connections into the centre, we would like a tree
> topology with the branch server concentrating all branch PC messages &
> forwarding them to the centre.
> But, PCs generate a data feed that we want to be able to access at centre,
> even when the branch server is offline.
>
> Proposed configuration:
>
> Use a failover network connection on branch PCs & configure the connection
> to prioritise a connection to the branch server, but open a direct
> connection to the centre if the branch server is unavailable.
>
>
> Details of configuration
>
> Using ActiveMQ 5.8.0 binary download.
> Only changes are to logging settings & to the configuration file.
>
> 3 brokers ("amq1", "amq2", "amq3"), all brokers running on localhost.
> Each uses their own config file (amq1.xml, amq2.xml, amq3.xml)
>
> Broker amq1 has a failover duplex connection to amq2.
> Broker amq3 has a duplex failover connection to both amq1 + amq2, it is
> configured to always try to connect to amq1 first ("randomize=false") and
> to
> fail-back to amq1 if it comes back online ("priorityBackup=true")
>
> Consumer connects to broker amq1
> Producer connects to broker amq3
>
> Test-harness sender application creates a new session each time it is run &
> sends a set of messages.
> The sending session is not transacted & is set to auto-acknowledge.
> Messages are sent with persistent delivery mode.
>
> Config files
>
> amq1.xml <http://activemq.2283324.n4.nabble.com/file/n4671409/amq1.xml>
> amq2.xml <http://activemq.2283324.n4.nabble.com/file/n4671409/amq2.xml>
> amq3.xml <http://activemq.2283324.n4.nabble.com/file/n4671409/amq3.xml>
>
> Test script
>
> Test-script.txt
> <http://activemq.2283324.n4.nabble.com/file/n4671409/Test-script.txt>
>
> Log files from test
>
> amq1.log <http://activemq.2283324.n4.nabble.com/file/n4671409/amq1.log>
> amq2.log <http://activemq.2283324.n4.nabble.com/file/n4671409/amq2.log>
> amq3.log <http://activemq.2283324.n4.nabble.com/file/n4671409/amq3.log>
>
>
>
>
>
>
>
>
>
> --
> View this message in context:
> http://activemq.2283324.n4.nabble.com/Need-help-Messages-lost-when-using-failover-network-connection-with-failback-tp4671409.html
> Sent from the ActiveMQ - User mailing list archive at Nabble.com.
>



-- 
*Christian Posta*
http://www.christianposta.com/blog
twitter: @christianposta

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