[jboss-jira] [JBoss JIRA] (DROOLS-1103) FireAllRules can trigger java.util.concurrent.RejectedExecutionException from the JDKTimerService
Juan Carlos Garcia (JIRA)
issues at jboss.org
Thu Jul 7 09:09:00 EDT 2016
[ https://issues.jboss.org/browse/DROOLS-1103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13262668#comment-13262668 ]
Juan Carlos Garcia commented on DROOLS-1103:
--------------------------------------------
No i don't, just to mention my setup:
We create thousands of StatefulKnowledgeSession session per hour as each of them correspond to a gaming session between few users (besides regulars game rules, we also have timer rules to control certain aspect as timeout, disconnect, ect), so once a game if finished we received a message to close the game (if we don't get the appropriate message we have some Janitors kicking in every 5 / 10 minutes and disposing the Sessions that are still in our SessionStore (ConcurrentMap on a Singleton EJB) and haven't received events from customers) and we disposed our StatefulKnowledgeSession in order to be good citizens.
In order to mitigate that exception we are now Serializing user access, per game to the StatefulKnowledgeSession thru our own locking.
I check today and we had only one of this exception in the past 15 days (but looks little bit different). as it is coming from a timer being triggered directly and not from FireAllRules scenario.
{code}
_ThreadID=21899;_ThreadName=pool-116731-thread-1;_TimeMillis=1467642563388;_LevelValue=900;|
Unable to execute timer job!
java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask at 60560a44 rejected from java.util.concurrent.ScheduledThreadPoolExecutor at 7671ec29[Shutting down, pool size = 1, active threads = 1, queued tasks = 0, completed tasks = 6]
at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2047)
at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:823)
at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute(ScheduledThreadPoolExecutor.java:326)
at java.util.concurrent.ScheduledThreadPoolExecutor.schedule(ScheduledThreadPoolExecutor.java:549)
at org.drools.core.time.impl.JDKTimerService.internalSchedule(JDKTimerService.java:116)
at org.drools.core.time.impl.JDKTimerService.scheduleJob(JDKTimerService.java:99)
at org.drools.core.phreak.PhreakTimerNode.scheduleTimer(PhreakTimerNode.java:307)
at org.drools.core.phreak.PhreakTimerNode.scheduleLeftTuple(PhreakTimerNode.java:230)
at org.drools.core.phreak.PhreakTimerNode.doLeftInserts(PhreakTimerNode.java:108)
at org.drools.core.phreak.PhreakTimerNode.doNode(PhreakTimerNode.java:83)
at org.drools.core.phreak.RuleNetworkEvaluator.evalNode(RuleNetworkEvaluator.java:400)
at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:332)
at org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:166)
at org.drools.core.phreak.AddRemoveRule.forceFlushLeftTuple(AddRemoveRule.java:320)
at org.drools.core.phreak.AddRemoveRule.flushLeftTupleIfNecessary(AddRemoveRule.java:293)
at org.drools.core.reteoo.BetaNode.assertObject(BetaNode.java:294)
at org.drools.core.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:494)
at org.drools.core.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:384)
at org.drools.core.reteoo.AlphaNode.assertObject(AlphaNode.java:145)
at org.drools.core.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:494)
at org.drools.core.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:384)
at org.drools.core.reteoo.ObjectTypeNode.propagateAssert(ObjectTypeNode.java:298)
at org.drools.core.phreak.PropagationEntry$Insert.execute(PropagationEntry.java:93)
at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:96)
at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:69)
at org.drools.core.impl.StatefulKnowledgeSessionImpl.flushPropagations(StatefulKnowledgeSessionImpl.java:1993)
at org.drools.core.phreak.RuleExecutor.fire(RuleExecutor.java:128)
at org.drools.core.phreak.RuleExecutor.fire(RuleExecutor.java:78)
at org.drools.core.phreak.PhreakTimerNode$TimerAction.evaluateAndFireRule(PhreakTimerNode.java:439)
at org.drools.core.phreak.PhreakTimerNode$TimerAction.execute(PhreakTimerNode.java:431)
at org.drools.core.phreak.SynchronizedPropagationList$1.execute(SynchronizedPropagationList.java:39)
at org.drools.core.common.DefaultAgenda.executeTask(DefaultAgenda.java:1355)
at org.drools.core.phreak.SynchronizedPropagationList.addEntry(SynchronizedPropagationList.java:36)
at org.drools.core.impl.StatefulKnowledgeSessionImpl.addPropagation(StatefulKnowledgeSessionImpl.java:1989)
at org.drools.core.phreak.PhreakTimerNode$TimerNodeJob.execute(PhreakTimerNode.java:375)
at org.drools.core.time.SelfRemovalJob.execute(SelfRemovalJob.java:34)
at org.drools.core.time.impl.DefaultTimerJobInstance.call(DefaultTimerJobInstance.java:69)
at org.drools.core.time.impl.DefaultTimerJobInstance.call(DefaultTimerJobInstance.java:30)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
{code}
> FireAllRules can trigger java.util.concurrent.RejectedExecutionException from the JDKTimerService
> -------------------------------------------------------------------------------------------------
>
> Key: DROOLS-1103
> URL: https://issues.jboss.org/browse/DROOLS-1103
> Project: Drools
> Issue Type: Bug
> Affects Versions: 6.3.0.Final
> Reporter: Juan Carlos Garcia
> Assignee: Mario Fusco
>
> Under very rare circumstance we have found the following exception *java.util.concurrent.RejectedExecutionException* in our production log.
> Our guess is that the Drools Session is on its way to be dispose, while a new incoming request is in the middle of a fireAllRules operation (race condition).
> I will try to provide a reproducible testcase for this.
> {code}
> Caused by: java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask at 3e896443 rejected from java.util.concurrent.ScheduledThreadPoolExecutor at 71cc2f4c[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0]
> at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2047)
> at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:823)
> at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute(ScheduledThreadPoolExecutor.java:326)
> at java.util.concurrent.ScheduledThreadPoolExecutor.schedule(ScheduledThreadPoolExecutor.java:549)
> at org.drools.core.time.impl.JDKTimerService.internalSchedule(JDKTimerService.java:118)
> at org.drools.core.time.impl.JDKTimerService.scheduleJob(JDKTimerService.java:101)
> at org.drools.core.phreak.PhreakTimerNode.scheduleTimer(PhreakTimerNode.java:304)
> at org.drools.core.phreak.PhreakTimerNode.scheduleLeftTuple(PhreakTimerNode.java:233)
> at org.drools.core.phreak.PhreakTimerNode.doLeftUpdates(PhreakTimerNode.java:131)
> at org.drools.core.phreak.PhreakTimerNode.doNode(PhreakTimerNode.java:65)
> at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:357)
> at org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:161)
> at org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:116)
> at org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:194)
> at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:67)
> at org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:935)
> at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1200)
> at org.drools.core.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:957)
> at org.drools.core.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:936)
> at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:260)
> at XXXXXX.XXXXX.XXXXX.processEventDrools(EventProcessorImpl.java:128)
> at XXXXXX.XXXXX.XXXXX.processEvent(EventProcessorImpl.java:101)
> {code}
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