[rules-users] Getting deadlock-like thread state

[Mauricio Salatino]

If you run each of these sessions alone does you get the same problem? or
this only happens when you try to run multiple sessions in parallel??


On Tue, Jul 23, 2013 at 1:33 PM, Bojan Janisch <
bojan.janisch at scai.fraunhofer.de> wrote:

> Hey drools users,
>
> I'm running drools multiple times in parallel with ECJ (genetic algorithm
> framework). Also I'm running ECJ multiple times in parallel (evaluation
> purpose).
> But each time I want to run ECJ, after an unspecific time, one thread is
> running infinite long while ECJ waits for it to finish. Additionally to
> this my
> working memory is steadily growing while hanging in this deadlock-like
> state, though this might not be due to drools. This goes on until I get an
> gc out of
> memory exception.
>
> I've created a threaddump which always looks so:
>
>  java.lang.Thread.State: RUNNABLE
>         at java.lang.Object.notifyAll(Native Method)
>         at
> org.drools.common.DefaultAgenda.notifyHalt(DefaultAgenda.java:1478)
>         - locked <0x00002af5f3b0fe88> (a
> java.util.concurrent.atomic.AtomicBoolean)
>         at
> org.drools.common.DefaultAgenda.addActivation(DefaultAgenda.java:466)
>         at
> org.drools.common.DefaultAgenda.addActivation(DefaultAgenda.java:326)
>         at
> org.drools.reteoo.RuleTerminalNode.assertLeftTuple(RuleTerminalNode.java:259)
>         at
> org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:196)
>         at
> org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:71)
>         at org.drools.reteoo.JoinNode.propagateFromLeft(JoinNode.java:107)
>         at org.drools.reteoo.JoinNode.assertLeftTuple(JoinNode.java:95)
>         at
> org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:196)
>         at
> org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:71)
>         at org.drools.reteoo.JoinNode.propagateFromLeft(JoinNode.java:107)
>         at org.drools.reteoo.JoinNode.assertLeftTuple(JoinNode.java:95)
>         at
> org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:196)
>         at
> org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:71)
>         at org.drools.reteoo.JoinNode.propagateFromRight(JoinNode.java:159)
>         at org.drools.reteoo.JoinNode.assertObject(JoinNode.java:148)
>         at
> org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)
>         at
> org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)
>         at
> org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)
>         at
> org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)
>         at
> org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:350)
>         at
> org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:311)
>         at
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:903)
>         at
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:847)
>         at
> org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:269)
>         at rulevolution.RulEvolution.runDrools(RulEvolution.java:343)
>         at rulevolution.RulEvolution.evaluate(RulEvolution.java:185)
>         at ec.simple.SimpleEvaluator.evalPopChunk(SimpleEvaluator.java:259)
>         at
> ec.simple.SimpleEvaluator$SimpleEvaluatorThreadCG.run(SimpleEvaluator.java:341)
>         at ec.util.ThreadPool$PoolThread.run(ThreadPool.java:57)
>
>    Locked ownable synchronizers:
>         - <0x00002af5f3ae95d0> (a
> java.util.concurrent.locks.ReentrantLock$NonfairSync)
>
> To my Programm:
>
> Rules are generated in parallel and for each rule, a new KnowledgeBase,
> KnowledgeBuilder and StatefulKnowledgeSession is created.
> Objects are inserted into the session and the rule is fired. The session
> will be disposed after no facts matches my rule or 1000
> conclusions are fired.
>
> I've searched the net for a similar problem, but with no success. Does
> someone know why Drools get into such a thread state and
> how to get out of it?
>
> I appreciate any help.
>
> Bojan
> _______________________________________________
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> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>



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