[jboss-jira] [JBoss JIRA] (DROOLS-1059) Drools can't find rules under stress
Mario Fusco (JIRA)
issues at jboss.org
Mon Apr 4 06:10:00 EDT 2016
[ https://issues.jboss.org/browse/DROOLS-1059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13185826#comment-13185826 ]
Mario Fusco commented on DROOLS-1059:
-------------------------------------
I created a more complex version of the provided reproducer in this pull request https://github.com/droolsjbpm/drools/pull/714 but with no luck. I'm not able to reproduce this issue neither I could understand where the problem could be by statically reading drools code.
As I wrote in the comment to that PR I asked to one of the guy of our QA team to give another look at this. However at the moment I really don't see how that exception could be thrown. The method where the exception is thrown is trying to navigate the rete network and find a specific node related with the query. In other words that part of the code is not related in any way with a specific KieSession but only with the KieBase from where all the KieSessions have been created.
Can you please confirm that you're not using incremental compilation (KieScanner)? That's the only feature that could change the KieBase when the KieSession are in use, so if you're using it we may have a concurrency problem there.
> Drools can't find rules under stress
> ------------------------------------
>
> Key: DROOLS-1059
> URL: https://issues.jboss.org/browse/DROOLS-1059
> Project: Drools
> Issue Type: Bug
> Components: core engine
> Affects Versions: 6.3.0.Final
> Reporter: Massinissa BOUZIAD
> Assignee: Mario Fusco
> Priority: Blocker
> Attachments: DroolsBugReproducerTest.java, reproducerRule.drl
>
>
> In my knowledge base, I have many rules.
> All of them are working very well in production with drools 6.0.1-FINAL even in stress condition hight trafic (arount 40 hits seconds)
> This bug append when we made an upgrade with drools 6.3.0-FINAL which is compatible with jdk8 mandatory in my case.
> So now when I put my rules under stress test (benchmarking) I got this random error.
> Drools is unable to find a query (not always the same one).
> I got this error for 0,6% of my requests.
> *+Following the stack trace : +*
> Unable to find query 'checkAndBindBasket'
> at org.drools.core.phreak.SegmentUtilities.getQueryLiaNode(SegmentUtilities.java:518) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.phreak.SegmentUtilities.getQuerySegmentMemory(SegmentUtilities.java:208) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.SegmentMemory$QueryMemoryPrototype.populateMemory(SegmentMemory.java:505) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.SegmentMemory$Prototype.newSegmentMemory(SegmentMemory.java:400) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.impl.KnowledgeBaseImpl.createSegmentFromPrototype(KnowledgeBaseImpl.java:1424) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.phreak.SegmentUtilities.restoreSegmentFromPrototype(SegmentUtilities.java:186) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.phreak.SegmentUtilities.createSegmentMemory(SegmentUtilities.java:83) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:167) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:60) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.AlphaNode.assertObject(AlphaNode.java:145) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:494) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:384) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.AlphaNode.assertObject(AlphaNode.java:145) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:60) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.AlphaNode.assertObject(AlphaNode.java:145) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:494) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:384) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.AlphaNode.assertObject(AlphaNode.java:145) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:494) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:384) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.AlphaNode.assertObject(AlphaNode.java:145) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:494) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:384) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.AlphaNode.assertObject(AlphaNode.java:145) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:494) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:384) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.reteoo.ObjectTypeNode.propagateAssert(ObjectTypeNode.java:298) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.phreak.PropagationEntry$Insert.execute(PropagationEntry.java:93) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:96) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:69) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.impl.StatefulKnowledgeSessionImpl.flushPropagations(StatefulKnowledgeSessionImpl.java:1993) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1289) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1294) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1281) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
> at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1260) ~[darty-pricing-ws-2.0.2.jar:2.0.2]
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