Can i use drools in multithreaded environment?
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Can i use drools in multithreaded environment?
by Barath
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Hi,
While doing a load test with jmeter,my web service application with drools works fine for few clients(5 simultaneous hits for 10 times) but when i increase my clients(120 simultanious hits for 100 times) i am gettin the following exception for few client, (out of 12,000 hits 200 throws this exception) problem encountered at node [11] 5{170,189}: unable to resolve property: null pointer exception in property: declr.identifier org.mvel.TemplateInterpreter.execute(TemplateInterpreter.java:528) org.mvel.TemplateInterpreter.parse(TemplateInterpreter.java:341) org.drools.rule.builder.dialect.java.AbstractJavaBuilder.generatTemplates(AbstractJavaBuilder.java:113) org.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build(JavaConsequenceBuilder.java:95) org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:67) org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:446) org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:304) org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:167) com.drools.util.RuleEngine.applyRule(RuleEngine.java:47) com.drools.util.DroolsController.getAdvertisement(DroolsController.java:94) com.drools.util.DroolsController.routeBusinessMethod(DroolsController.java:67) com.drools.util.DroolsController.getAdvertisement(DroolsController.java:43) com.drools.MyEndpoint.getAdvertisement(MyEndpoint.java:237) com.drools.MyEndpoint.process(MyEndpoint.java:144) org.apache.servicemix.common.AsyncBaseLifeCycle.doProcess(AsyncBaseLifeCycle.java:489) org.apache.servicemix.common.AsyncBaseLifeCycle.processExchange(AsyncBaseLifeCycle.java:441) org.apache.servicemix.common.BaseLifeCycle.onMessageExchange(BaseLifeCycle.java:46) org.apache.servicemix.jbi.messaging.DeliveryChannelImpl.processInBound(DeliveryChannelImpl.java:595) org.apache.servicemix.jbi.nmr.flow.AbstractFlow.doRouting(AbstractFlow.java:174) org.apache.servicemix.jbi.nmr.flow.seda.SedaFlow.doRouting(SedaFlow.java:176) org.apache.servicemix.jbi.nmr.flow.seda.SedaQueue$1.run(SedaQueue.java:134) edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:665) edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:690) java.lang.Thread.run(Thread.java:619) drl file has 6 rules, 5 rules - which retract facts which passes the rule. 1 rule(low salience) - will add the fact to java.util.List (set as global) which passes the rule. 1 . Am i getting this error bcoz of the global list? or any other reason? 2 . How to solve this problem? here the rules, global java.util.List feasibleAdv; rule " percentage rule " when $adv : Advertisement( percentageLimit != 0 , percentageLimit < playedPercentage ) then System.out.println("remove this adv (failed percentage): "+$adv.getAdvertisementID()); retract($adv); end rule "per day rule" when $adv : Advertisement( limitperday != 0 , limitperday <= playedperday ) then //System.out.println("remove this adv (failed day): "+$adv.getAdvertisementID()); retract($adv); end rule "per week rule" when $adv : Advertisement( limitperweek != 0 , limitperweek <= playedperweek) then //System.out.println("remove this adv (failed week): "+$adv.getAdvertisementID()); retract($adv); end rule "per month rule" when $adv : Advertisement( limitpermonth != 0 , limitpermonth <= playedpermonth) then //System.out.println("remove this adv (failed month) : "+$adv.getAdvertisementID()); retract($adv); end rule "total played rule" when $adv : Advertisement( totallimit != 0 , totallimit <= totalplayed ) then //System.out.println("remove this adv (failed total played) : "+$adv.getAdvertisementID()); retract($adv); end rule "advertisement select rule" salience -1 when $adv : Advertisement( $playedPercentPerAdvertisement : playedPercentPerAdvertisement) not( Advertisement( playedPercentPerAdvertisement < $playedPercentPerAdvertisement ) ) $advertisementCount : Integer() then boolean status = true; if($advertisementCount-1 < 0){ //System.out.println("halted"); status = false; drools.halt(); } if(status){ feasibleAdv.add($adv); drools.update( drools.getWorkingMemory().getFactHandle($advertisementCount), new Integer($advertisementCount-1) ); retract($adv); } end Thanks, ~Barath. |
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Re: Can drools work in multithreaded environment?
by Edson Tirelli-3
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Barath, What version of drools are you using? The drools rulebase is designed to be shared among multiple threads. The working memory (session) is not. Having said that, we had a couple bugs in the past regarding multi-thread environments, and so you must use 4.0.7 version that is about to be released. For you test, while you wait for the official release, you can checkout the code and built it from here: http://anonsvn.labs.jboss.com/labs/jbossrules/branches/4.0.x/ []s Edson 2008/5/5 Barath <barathguna@...>:
-- Edson Tirelli JBoss Drools Core Development Office: +55 11 3529-6000 Mobile: +55 11 9287-5646 JBoss, a division of Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list rules-users@... https://lists.jboss.org/mailman/listinfo/rules-users |
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Re: Can drools work in multithreaded environment?
by Barath
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Edson,
I am using 4.0.3 version. In my code, * For each thread new rule base and StatefulSession is created. * Then why i am getting the previously mentioned exceptions(which i posted in the first message) for few threads only while other works fine. * Your suggestions please, " 1 . Am i getting this error bcoz of the global list? or any other reason? 2 . How to solve this problem?" ~Barath.
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Re: Can drools work in multithreaded environment?
by Edson Tirelli-3
::
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You must update to 4.0.7. You are probably facing the issues we had in 4.0.3. []s Edson 2008/5/7 Barath <barathguna@...>:
-- Edson Tirelli JBoss Drools Core Development Office: +55 11 3529-6000 Mobile: +55 11 9287-5646 JBoss, a division of Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list rules-users@... https://lists.jboss.org/mailman/listinfo/rules-users |
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Re: Can drools work in multithreaded environment?
by toddp2
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I ran into the same issue running JMeter recently. I am getting the same stack trace. I checked my version and I am using 4.0.7 of Drools. Was this resolved by going to 4.0.7 for you? Is there anything else to check? Todd
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Re: Can drools work in multithreaded environment?
by Edson Tirelli-3
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If you are running 4.0.7 and using the proper MVEL dependecy lib, you should not be facing any concurrency problem, assuming you are sharing the rulebase but not the session. []s Edson 2008/9/4 toddp2 <tpatch@...>
-- Edson Tirelli JBoss Drools Core Development JBoss, a division of Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list rules-users@... https://lists.jboss.org/mailman/listinfo/rules-users |
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Re: Can drools work in multithreaded environment?
by Mark Proctor
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We are going to need some test to replicate this, if we are to fix it,
unless someone else can track down the issue.
Mark toddp2 wrote: I ran into the same issue running JMeter recently. I am getting the same stack trace. I checked my version and I am using 4.0.7 of Drools. Was this resolved by going to 4.0.7 for you? Is there anything else to check? Todd You must update to 4.0.7. You are probably facing the issues we had in 4.0.3. []s Edson 2008/5/7 Barath barathguna@...: _______________________________________________ rules-users mailing list rules-users@... https://lists.jboss.org/mailman/listinfo/rules-users |
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