[jboss-jira] [JBoss JIRA] (DROOLS-1059) Drools can't find rules under stress

Sebastian Schaer (JIRA) issues at jboss.org
Thu Mar 31 07:04:00 EDT 2016 

    [ https://issues.jboss.org/browse/DROOLS-1059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13184484#comment-13184484 ] 

Sebastian Schaer commented on DROOLS-1059:
------------------------------------------

Hi,
I'm experiencing the same issue as well under a stress test situation:
Seemingly random failures for queries (but they all exist).
We typically run only about 10-20 rules though.
I will try to add more information or work on a reproducer (if I find the time).
Just my observations and an example stacktrace of the error we encounter:
{code}
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.387 |  java.lang.RuntimeException: Unable to find query 'rule_2f6dc65eb814487eb37acde7c99c2a16_query'
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.387 | 	at org.drools.core.phreak.SegmentUtilities.getQueryLiaNode(SegmentUtilities.java:518) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.387 | 	at org.drools.core.phreak.SegmentUtilities.getQuerySegmentMemory(SegmentUtilities.java:208) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.387 | 	at org.drools.core.reteoo.SegmentMemory$QueryMemoryPrototype.populateMemory(SegmentMemory.java:505) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.387 | 	at org.drools.core.reteoo.SegmentMemory$Prototype.newSegmentMemory(SegmentMemory.java:400) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.387 | 	at org.drools.core.impl.KnowledgeBaseImpl.createSegmentFromPrototype(KnowledgeBaseImpl.java:1424) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.387 | 	at org.drools.core.phreak.SegmentUtilities.restoreSegmentFromPrototype(SegmentUtilities.java:186) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.387 | 	at org.drools.core.phreak.SegmentUtilities.createSegmentMemory(SegmentUtilities.java:83) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.413 | 	at org.drools.core.phreak.SegmentUtilities.createChildSegment(SegmentUtilities.java:321) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.413 | 	at org.drools.core.phreak.SegmentUtilities.createChildSegments(SegmentUtilities.java:313) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.413 | 	at org.drools.core.reteoo.LeftInputAdapterNode.doInsertObject(LeftInputAdapterNode.java:186) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.413 | 	at org.drools.core.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:170) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.413 | 	at org.drools.core.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:60) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.413 | 	at org.drools.core.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:366) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.413 | 	at org.drools.core.reteoo.ObjectTypeNode.propagateAssert(ObjectTypeNode.java:298) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.413 | 	at org.drools.core.phreak.PropagationEntry$Insert.execute(PropagationEntry.java:93) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.413 | 	at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:96) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.413 | 	at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:69) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.413 | 	at org.drools.core.impl.StatefulKnowledgeSessionImpl.flushPropagations(StatefulKnowledgeSessionImpl.java:1993) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.413 | 	at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1289) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.413 | 	at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1294) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.413 | 	at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1281) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.413 | 	at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1270) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.414 | 	at org.drools.core.command.runtime.rule.FireAllRulesCommand.execute(FireAllRulesCommand.java:107) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.414 | 	at org.drools.core.command.runtime.rule.FireAllRulesCommand.execute(FireAllRulesCommand.java:34) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.414 | 	at org.drools.core.command.runtime.BatchExecutionCommandImpl.execute(BatchExecutionCommandImpl.java:153) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.414 | 	at org.drools.core.command.runtime.BatchExecutionCommandImpl.execute(BatchExecutionCommandImpl.java:69) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
INFO   | jvm 1    | main    | 2016/03/25 18:34:14.414 | 	at org.drools.core.impl.StatelessKnowledgeSessionImpl.execute(StatelessKnowledgeSessionImpl.java:292) ~[drools-core-6.3.0.Final.jar:6.3.0.Final]
{code}
Unlike [~massinissa] we use stateless sessions and the exception happens when we execute the FireAllRulesCommand.
I also implemented a very simple retry logic (limited to 5 retries) around this specific exception (catching this exception, and reusing the existing stateless session to execute the same command again) and so far I have not encountered any case where the exception gets thrown a second time. And from all I can tell the second time the FireAllRulesCommand is executed, the rule evaluation seems ok (we create/insert facts and all of that seems to be working fine).
(So my preliminary workaround is to just re-execute the same command on the same session and it seems ok so far. This of course might not work with stateful sessions).

> 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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