Messages not forwarded to broker in duplex mode

[kpalania <kp...@yahoo.com>]

This is my topology:
* Broker A is outside the LAN and has no network connectors.
* Brokers B and C are running on 2 different machines inside the LAN and
have duplex set to TRUE.
* Client sends a message to queue1 on brokerA and sends another message to
queue2 on brokerA.
* Broker A receives both the messages instantaneously.

Question #1: Brokers B and C do not appear to have the message. When I
browse the queue, I do not see any messages. However, after I browse the
queues on broker A using the activemq-admin command, the messages
immediately appear on both the brokers (B and C). How can this be explained?

* I send another message to broker A, first to queue1 and then to queue2.
* These messages do not appear on brokers B and C unless and until I bounce
both the brokers.

Question #2: Why is this the case, and how can I fix it such that the
messages show up instantaneously in the queues on brokers B and C?

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Re: Messages not forwarded to broker in duplex mode

[Rob Davies <ra...@gmail.com>]

On 24 Jul 2008, at 21:24, kpalania wrote:

>
> This is my topology:
> * Broker A is outside the LAN and has no network connectors.
> * Brokers B and C are running on 2 different machines inside the LAN  
> and
> have duplex set to TRUE.
> * Client sends a message to queue1 on brokerA and sends another  
> message to
> queue2 on brokerA.
> * Broker A receives both the messages instantaneously.
>
> Question #1: Brokers B and C do not appear to have the message. When I
> browse the queue, I do not see any messages. However, after I browse  
> the
> queues on broker A using the activemq-admin command, the messages
> immediately appear on both the brokers (B and C). How can this be  
> explained?
>
> * I send another message to broker A, first to queue1 and then to  
> queue2.
> * These messages do not appear on brokers B and C unless and until I  
> bounce
> both the brokers.
>
> Question #2: Why is this the case, and how can I fix it such that the
> messages show up instantaneously in the queues on brokers B and C?
>
> -- 
> View this message in context: http://www.nabble.com/Messages-not-forwarded-to-broker-in-duplex-mode-tp18639191p18639191.html
> Sent from the ActiveMQ - User mailing list archive at Nabble.com.


ActiveMQ uses dynamic subscription propagation - so BrokerA will not  
pass messages to BrokerB or BrokerC unless they have expressed an  
interest in messages for the queue.
They will do this if :
1. They have an active consumer for the queue (client attached to them)
2. You have configured their network connections with  a statically  
included destination - that matches the queues on BrokerA you want to  
be propagated - see http://activemq.apache.org/networks-of-brokers.html


hope that helps!



cheers,

Rob

http://open.iona.com/products/enterprise-activemq
http://rajdavies.blogspot.com/