June 2009 - jboss-user - Jboss List Archives

[JBoss Cache: Core Edition] - Re: BerkeleyDB Deadlock Exception from JBoss Cache Loader: B

by galder.zamarreno＠jboss.com

"niuxuetao_fiserv" wrote : About the write-intensive stuff, yes, we will have a lot more calls to attach() than modifying the already cached Pojos. Attaching a pojo is an expensive operation where the pojo is dissected and mapped to the cache, hence such operation should be used as less as possible. Detailed information on the process can be found in http://www.jboss.org/file-access/default/members/jbosscache/freezone/docs... If you're calling attach more often than modifying the Pojo directly, I'm not sure of the suitability of PojoCache in your case. It might even be more of a burden than using plain JBoss Cache. The point of a PojoCache is that you attach once and then you interact with the bean as normal, calling it's getters,setters...etc and when you're done with it, you detach it. "niuxuetao_fiserv" wrote : 1. If I call attach() with a key and value that already exist in the cache, what will happen? Hmmm, do you mean what happens when you attach a pojo under a fqn+key that already contains a pojo? In that case, the existing pojo is detached and the new one is reattached. Due to the reasons above, this is an expensive operation. "niuxuetao_fiserv" wrote : 2. How do I use transaction in java code to explicitly begin and end a transaction? | - DummyTransactionManager.getUserTransaction()? | - or like describe in this page? http://www.jboss.org/file-access/default/members/jbosscache/freezone/docs... which looks a pretty old doc? | Well, depends the environment in which you're in. If you're within an application server, you get a UserTransaction from JNDI or from an EJB context. If you're outside of an application server, you should be using something like JBoss Transactions that allows setting up a transaction manager and getting a user transaction. You can find examples in their docu. Finally, DummyTransactionManager does what it says on the tin. It's dummy, so it's not really a transaction manager, it's simply used as a mock for testing purpouses and hence you shouldn't be using it in conjunction with your production code. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4240929#4240929 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4240929

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[JBoss jBPM] - Any Known compatibility issues in jbpm-bpel1.1.1 and jboss4.

by Gaurav_Sharma

I have a complex process that i am trying to deploy using the above 2, but keep on getting errors that prevent successful deployment. Since for now i dont want to customize the code, it shall be helpful if someone can point me in the right direction, regarding the issues. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4240927#4240927 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4240927

16 years, 9 months

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[JBoss Messaging] - Re: Clustering differences versus JBoss MQ

by gaohoward

Hi Richard, I'll take a look at the wiki. Thanks. Howard View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4240925#4240925 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4240925

16 years, 9 months

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[JBoss Cache: Core Edition] - Re: How does JBoss Cache perform with high (15-20) number of

by bela＠jboss.com

"souravm" wrote : All together I've around 250x1000 such entities, which would be replicated across 20 nodes (in about 2-3 mins timeframe). | Do you mean that every node has to store 250MB of data ? By 'replicated' I infer total replication: everyone replicates to everybody else... anonymous wrote : | Now each entity being a size of 1 KB, we have provisioned for 250MB memory at each instance level (that means every node has all the state of the system). Given that I think with increase in number of instances in the cluster, the memory need would not increase. | OK, but then you're not using total replication, I assume 250MB is the total data distributed across the cluster ? anonymous wrote : | My concern is more with the CPU cycles which will go in marshaling/unmarshaling data. Given that every instance would receive data from all other (N-1) instances, the CPU cycles in marshaling the data would grow in all nodes in addition of more nodes in the cluster. | Yes. Note that ispan doesn't use java.io.serialization though, so this is pretty efficient. But, yes, it might still be a perf issue. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4240924#4240924 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4240924

16 years, 9 months

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[JBoss Cache: Core Edition] - Re: Distributed model with Jbosscache

by galder.zamarreno＠jboss.com

The fact that all regions where not online at the same time wouldn't be a problem. When a new store comes in, it could retrieve the state from a persistent store or from another node in the cluster. How many retail branches are we talking about here? What type of data would these retail branches share? What type of network links the different branches? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4240923#4240923 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4240923

16 years, 9 months

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[JBoss Messaging] - Re: Clustering differences versus JBoss MQ

by kennardconsulting

gaohoward, I would gladly rework and update the Wiki FAQ for you if you can furnish me with a solution :) Regards, Richard. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4240921#4240921 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4240921

16 years, 9 months

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[EJB 3.0] - Re: circular references

by robert.geisler

(sorry for double posting, i cannot edit me previous post) jaikiran, i have a last question... @IgnoreDependency -what does it actually mean? Ignore the dependency created by an injection annotation applied sadly, that does not make it clear for me :- \ how could one explain it in a few words? thanks again robert View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4240918#4240918 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4240918

16 years, 9 months

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[JBoss Messaging] - Re: Clustering differences versus JBoss MQ

by kennardconsulting

Clebert, Thanks for your input. I am fine to manually failover in my producer, as I control that code. However the problem I'm having is that, upon restarting a cluster node, the MDBs do not 'wake up' and start consuming messages from the HA queue. The code to connect the MDBs is controlled by JBoss (I presume - it's all magic to me :), so I'm unclear how I can do the reconnects myself? Regards, Richard. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4240917#4240917 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4240917

16 years, 9 months

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[JBoss Messaging] - Re: Clustering differences versus JBoss MQ

by clebert.suconic＠jboss.com

JBossMessaging has automatic failover. If you want to control the failover the same style you would do on JBossMQ, you need to disable failover and do the reconnects yourself. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4240914#4240914 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4240914

16 years, 9 months

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[EJB 3.0] - Re: circular references

by robert.geisler

"jaikiran" wrote : | That's correct. | i'm glad ; ) "jaikiran" wrote : | Wouldn't this work: | | | public class StatlessTwoBean implements StatlessTwo { | | @EJB(beanName = "StatlessOne") // lookup "always" | | @IgnoreDependency | | private StatlessOne statlessOne; | yes, your are right, that should work. yesterday i thought about the problem only from the StatelessOneBeans point of view... but the other way around it should just work : ) my fault O: ) i will give it a try and let you know what happened. thank you very much for your help, jaikiran. regards robert View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4240912#4240912 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4240912

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jboss-user June 2009