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From VJ22 <Vijay.N...@iflexsolutions.com>
Subject Re: Spring JMS Scalability - Newbie questions
Date Sat, 13 Oct 2007 07:25:56 GMT

Hello James,

Thanks a ton for the answers...Much appreciated considering your
workload.....Just some final clarifications if you do not mind answering
them....

- By setting the value of the concurrent consumers I assume that many
consumers are ready for message consumption.....By setting the value of
cache to CACHE_CONSUMER does it imply that consumers are re-used across
listener threads or once a consumer has been created for a listener thread
it is re-used for message consumption for every subsequent messages passed
to that listener thread ? I use the Default Message Listener Container along
with native ActiveMQ settings using the amq namespace...This has a default
cache of CACHE CONSUMER so I presume it is OK for now

- I do use MessageListener Adapter as my listeners with the default response
destination set for response messages....It has been working fine for
now....I also use JMSTransactionManager within the Container definition

- I presume that when you meant re-use the same JMS Session across JMS
Message Listener Container and JMS Template (which the container would be
using for response messages), a setting of CACHE_CONSUMER should be enough

- Yes, the message listener container is good but the ActiveMQ Java Doc
clearly states that PooledConnectionFactory should be used only for
producers and not consumers so was just clarifying

- Finally, do you think using a ServerSessionMessageListenerContainer would
be better than a DefaultMessageListenerContainer ? 

Thanks a ton again for the answers

Regards...VJ



James.Strachan wrote:
> 
> On 11/10/2007, VJ22 <Vijay.Nair@iflexsolutions.com> wrote:
>>
>> Hi All,
>>
>> I have just implemented a messaging system using Spring JMS with Active
>> MQ
>> 4.1.1...I do have some questions...Would be appreciable if someone could
>> answer them
>>
>> We are looking at processing close to 100000 transactions in a
>> minute...Heres my settings
>>
>> -> 1 Message Listener Container with 300 concurrent consumers of a
>> particular class configured via a MessageListenerAdapter
> 
> If you are using the MessageListenerContainer and want high
> performance you should ideally set the cache level to "CONSUMER" -
> then consumers are reused (rather than being created & destroyed each
> time along with the session (and connection too if you don't use
> CONNECTION caching or the PooledConnectionFactory).
> 
> Note though that there's currently a bug in Spring if you're expecting
> to use JMS transactions to consume then send in the same session...
> http://opensource.atlassian.com/projects/spring/browse/SPR-3890
> 
> Also if you want to use a single JMS session (to avoid XA) make sure
> you reuse the same JMS session on both the JmsTemplate and
> MessageListenerContainer.
> 
> 
>> -> Connection Factory is "org.apache.activemq.pool.PooledConnectionFact
>> ory"
>>
>> My question is whether the connection factory usage is OK? I have read at
>> many places that the connection factory usage should be ideally via JCA
>> due
>> to better resource management. Also, the PooledConnectionFactory should
>> be
>> ideally used for producing and not consuming. I do not want to use Jencks
>> as
>> we will be migrating to Spring 2.1 which has got the requisite JCA
>> Features.
>> Also is there any other alternative ?
> 
> The Spring MessageListenerContainer stuff is fine - provided you set
> it up and configure it correctly. FWIW we use it as the JMS consuming
> component in Camel to provide EIP integration...
> 
> http://activemq.apache.org/enterprise-integration-patterns.html
> 
> 
>> Secondly, I presume when I mention 300 consumers, 300 parallel threads
>> are
>> automatically spawned....is there a way to mention if each thread should
>> automatically prefetch a set of messages and process them ?
> 
> Yes - ActiveMQ client does that automatically.
> http://activemq.apache.org/what-is-the-prefetch-limit-for.html
> 
>> Also is 300
>> consumers a lot ?
> 
> It depends on your platform and what the consumer does; i'd experiment
> with the number and see which one performs best. Sometimes on some
> platforms (particularly solaris) the thread context switching often
> outweighs the extra parallelism. Sometimes if your consumer is just
> doing database stuff, your database often dictates how parallel you
> should be for optimum performance.
> 
> If you have a high number of consumers; with a high prefetch - you may
> use up too much RAM BTW (and sometimes starve the queue) so you might
> want to experiment lowering the prefetch or consumer count if RAM is
> tight.
> 
> -- 
> James
> -------
> http://macstrac.blogspot.com/
> 
> Open Source SOA
> http://open.iona.com
> 
> 

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