[JBoss-user] [Clustering/JBoss] - Need help with transaction problem in cluster
Hi, I've run into a problem while trying to move an application from a single server to a clustered environment. The application uses a BMP entity bean, where it first calls a finder method which returns some instances of the bean (using an SQL select query) , and then the application takes the first returned bean, changes some attributes (using a PL/SQL stored procedure) and uses these attributes further on. To make it a bit more understandable, let's say the bean has an attribute X. The finder returns all bean instances (table rows) where X=0. Then the application sets X to 1 (marks it as used) for the first retrieved instance and continues using this bean (assuming it has the exclusive access to it since concurrent processes will not find it because of X=1). This works fine on a single node, even under high load. However, when I change to the cluster (2 nodes for now), the following happens. When the same procedure runs on both cluster instances roughly at the same time, both first find the same beans, take the first bean (which is the same) and then update it. There is no concurrent access or other exception, so both processes think they have unique access to the bean. Further on, this causes some trouble, as you might guess. I think, that in the non-clustered environment, JBoss locks the entity bean as soon as the first transaction accesses it, thus preventing the other transactions from reading it. In the clustered environment, the two JBoss instances do not prevent this, since they only see their own entity instances. Now I'm wondering how to get out of this situation. Will I need to work around this with some clever SQL, or is there a way to make JBoss do the entity locking (as I imagine it) in the cluster? Or something else? I know that the entity cache will be available from JBoss 4 only. Btw, I'm using JBoss 3.2.4, the datasource is local, isolation level is Repeatable_Read, and commit option is C. What is the difference between Standard BMP EntityBean and Clustered BMP EntityBean? Thanks for your help Martin View the original post : http://www.jboss.org/index.html?module=bbop=viewtopicp=3845225#3845225 Reply to the post : http://www.jboss.org/index.html?module=bbop=postingmode=replyp=3845225 --- SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 Save 50% off Retail on Ink Toner - Free Shipping and Free Gift. http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 ___ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [Clustering/JBoss] - Re: Clustering Jboss and deploying SLSB's
Make sure you don't create the remote interface before each call. Instead create it once, and use it for all subsequent calls. Cheers Martin View the original post : http://www.jboss.org/index.html?module=bbop=viewtopicp=3842671#3842671 Reply to the post : http://www.jboss.org/index.html?module=bbop=postingmode=replyp=3842671 --- This SF.Net email is sponsored by BEA Weblogic Workshop FREE Java Enterprise J2EE developer tools! Get your free copy of BEA WebLogic Workshop 8.1 today. http://ads.osdn.com/?ad_id=4721alloc_id=10040op=click ___ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [Clustering/JBoss] - Re: deploy order/directories + singleton
Hi, this thread should answer your first question: http://www.jboss.org/index.html?module=bbop=viewtopict=50112 Cheers Martin View the original post : http://www.jboss.org/index.html?module=bbop=viewtopicp=3840120#3840120 Reply to the post : http://www.jboss.org/index.html?module=bbop=postingmode=replyp=3840120 --- This SF.Net email sponsored by Black Hat Briefings Training. Attend Black Hat Briefings Training, Las Vegas July 24-29 - digital self defense, top technical experts, no vendor pitches, unmatched networking opportunities. Visit www.blackhat.com ___ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [Clustering/JBoss] - How to easily separate clusters from each other?
Hi, we have, in the same sub-net, several environments (dev, test, ...), where each of them consists of two cluster-instances. Apparently, they see and influence each other. Especially the load-balanced clients get all IPs of all instances, not just the two they are supposed to connect to. What would be the easiest way to separate these clusters? Would it be enough to change the mcast_port in cluster-service.xml? Thanks View the original post : http://www.jboss.org/index.html?module=bbop=viewtopicp=3839867#3839867 Reply to the post : http://www.jboss.org/index.html?module=bbop=postingmode=replyp=3839867 --- This SF.Net email sponsored by Black Hat Briefings Training. Attend Black Hat Briefings Training, Las Vegas July 24-29 - digital self defense, top technical experts, no vendor pitches, unmatched networking opportunities. Visit www.blackhat.com ___ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [Clustering/JBoss] - Re: Suddenly a strange Exception
Hi, we are seeing the same exception with JBoss 3.2.4RC2. With JBoss 3.2.4 it seems to have changed to 2004-06-15 12:50:04,168 WARN [org.jgroups.protocols.UDP] discarded message from different group (). Sender was host:41639 (additional data: 19 bytes) Since we have two clusters running, one with 3.2.4RC2 and the other with 3.2.4, my best bet is that they receive each others messages, but 3.2.4 handles it more gracefully. Could anyone confirm this, or otherwise point to a different solution? Cheers Martin View the original post : http://www.jboss.org/index.html?module=bbop=viewtopicp=3838934#3838934 Reply to the post : http://www.jboss.org/index.html?module=bbop=postingmode=replyp=3838934 --- This SF.Net email is sponsored by The 2004 JavaOne(SM) Conference Learn from the experts at JavaOne(SM), Sun's Worldwide Java Developer Conference, June 28 - July 1 at the Moscone Center in San Francisco, CA REGISTER AND SAVE! http://java.sun.com/javaone/sf Priority Code NWMGYKND ___ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [Clustering/JBoss] - Order of deploying EARs in deploy / farm directory
Hi, is there a way to control the order in which EARs are deployed that reside in the deploy and farm directory? I need to make sure that the EARs in farm are deployed first, because in deploy I have EARs depending on them. Thanks Martin View the original post : http://www.jboss.org/index.html?module=bbop=viewtopicp=3836181#3836181 Reply to the post : http://www.jboss.org/index.html?module=bbop=postingmode=replyp=3836181 --- This SF.Net email is sponsored by: Oracle 10g Get certified on the hottest thing ever to hit the market... Oracle 10g. Take an Oracle 10g class now, and we'll give you the exam FREE. http://ads.osdn.com/?ad_id=3149alloc_id=8166op=click ___ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [Clustering/JBoss] - Re: Order of deploying EARs in deploy / farm directory
kaobe wrote : I have not tried it, but it could work for you if you add a depends tag to your deploymentscanner mbean in jboss-service.xml. There you tell it it depends on the FarmMember mbean in farm-service.xml. So it should deploy the farm directory first. | | Another possibility could be to put the mbean definition from farm-service before the one in jboss-service. I think the xml-files are deployed from top to bottom. Hi Peter, thanks for your remarks. I tried the first one, but it kind of screws up the whole deployment process, so that nothing get's deployed correctly anymore. The second one seemed to be more promising. Until I realized that I need the datasource installed before anything else. So the correct deployment order (for me) would be deploy(datasource)-farm-deploy(rest). I played around a bit and found that I can create a directory deploy.last2 which get's deployed after deploy.last, where the farm-service.xml resides. This does the trick. Now first the datasource and all the other essential stuff from deploy gets installed, then what's in farm, and then the remaining parts of my application. Btw, I'm using JBoss 3.2.4RC2. Greetings Martin View the original post : http://www.jboss.org/index.html?module=bbop=viewtopicp=3836208#3836208 Reply to the post : http://www.jboss.org/index.html?module=bbop=postingmode=replyp=3836208 --- This SF.Net email is sponsored by: Oracle 10g Get certified on the hottest thing ever to hit the market... Oracle 10g. Take an Oracle 10g class now, and we'll give you the exam FREE. http://ads.osdn.com/?ad_id=3149alloc_id=8166op=click ___ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
