[jboss-jira] [JBoss JIRA] (DROOLS-272) KieSession.fireUntilHalt() consumes 100% CPU

[Duncan Doyle (JIRA)]

Duncan Doyle created DROOLS-272:
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             Summary: KieSession.fireUntilHalt() consumes 100% CPU
                 Key: DROOLS-272
                 URL: https://issues.jboss.org/browse/DROOLS-272
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
    Affects Versions:  6.0.0.CR3
         Environment: Mac OS-X 1.8.5 + Hotspot JDK 1.7.0_40, RHEL 6.4 + OpenJDK 1.7.0_25, Fedora 18 + Java 6.
            Reporter: Duncan Doyle
            Assignee: Mark Proctor
            Priority: Blocker


When I run a KieSession.fireUntilHalt(), my application starts consuming 100% CPU, without anything actually happening inside the app (no events/facts are being inserted, no rules are activated/fired, etc.). We've tested this on multiple machines, different OSs, different JDKs, etc., and they all show the same behaviour.

I've created a small test that shows the problem. The test loads a simple DRL via KieClasspathContainer, retrieves a new KieSession and runs a KieSession.fireUntilHalt() in a separate thread. After launching the thread, I let the main thread sleep for 30 seconds (3 * 10) and during this time period, CPU load increases to 100%. I then halt the session and sleep for another 10 seconds, which causes the CPU load to back to normal. The test project can be found here: https://github.com/DuncanDoyle/DroolsFireUntilHalt/
Just run 'mvn clean test' on the project.

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