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From ttmdev <joe.fernan...@ttmsolutions.com>
Subject Re: Cyclic network of brokers: configuration and duplicates
Date Wed, 23 Apr 2008 16:02:50 GMT

A static connector, having multiple IP addresses, will force the broker to
connect to *all* the brokers whose IP addresses are listed in the connector. 

It is the client failover connector that, by default, randomly chooses one
of the listed IP addresses/brokers (i.e., is more than one is provided). For
example,

failover:(tcp://localhost:61616,tcp://remotehost:61616)

Joe
Goto www.ttmsolutions.com for a free ActiveMQ user guide




toff wrote:
> 
> Dear activeMQ gurus,
> 
> although I have not yet found an answer, this question is related to
> posts:
> 
> (1)
> http://www.nabble.com/Network-of-Brokers-configuration-limitation--td11639335s2354.html#a11639335
> 
> and
> 
> (2)
> http://www.nabble.com/Network-of-Brokers-...-td2921710s2354.html#a3114441
> 
> I am testing the behavior of our in-house implementation of a
> content-based routing solution (e.g., pub-sub: that is topics and not
> queues) against the performances of an activeMQ network of brokers. My
> question is: what is the best (in terms of performances and message
> duplicates) configuration I can use for a cyclic network?
> 
> To start simple I am using the following topology:
> S1--S3
> |      |
> S2--S4
> 
> The configuration file for S1 is therefore:
> 
> <beans
>   xmlns="http://www.springframework.org/schema/beans"
>   xmlns:amq="http://activemq.org/config/1.0"
>   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>   xsi:schemaLocation="http://www.springframework.org/schema/beans
> http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
>   http://activemq.org/config/1.0
> http://activemq.apache.org/schema/activemq-core.xsd
>   http://activemq.apache.org/camel/schema/spring
> http://activemq.apache.org/camel/schema/spring/camel-spring.xsd">
>   <bean
> class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"/>
>   <broker xmlns="http://activemq.org/config/1.0" useJmx="false"
> brokerName="node33" persistent="false">
>     <transportConnectors>
>     	<transportConnector name="local" uri="tcp://localhost:17701"/>
>     </transportConnectors>
>     <networkConnectors>
>       <networkConnector name="S2" dynamicOnly="true" networkTTL="15"
> uri="static://(tcp://node34:17702)"/>
>       <networkConnector name="S3" dynamicOnly="true" networkTTL="15"
> uri="static://(tcp://node35:17703)"/>
>     </networkConnectors>   
>   </broker>
>   <commandAgent xmlns="http://activemq.org/config/1.0"/>
> </beans>
> 
> In contrast to post (1) and from what I gather from
> http://activemq.apache.org/networks-of-brokers.html , I am specifying
> multiple network connectors as I want S1 to be connected to both S1 and
> S2. If I understand correctly, a static URI with multiple addresses (e.g.,
> uri="static:(tcp://localhost:61616,tcp://remotehost:61616,tcp://..)")
> results in a random connection to just one of the provided addresses.
> 
> Is this the right way to do it?
> From the client logs I would definitely say no, as each client receives
> multiple (thousands!) copies of the same message.
> 
> Are cyclic topologies supported? Could someone please suggest a
> configuration for them?
> 
> Or should I just use hierarchical topologies?
> 
> The latter is the conclusion I infer from post (2), but if there's
> somebody knowledgeable about this out there I'd be really happy to have a
> final word on this issue.
> 
> Thanks in advance,
> 
> Gio
> 
> 
> 
> 
> 
> 
> 

-- 
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