[jboss-jira] [JBoss JIRA] (DROOLS-3412) Performance degradation with session pools

[Christian Liebhardt (Jira)]

Christian Liebhardt created DROOLS-3412:
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             Summary: Performance degradation with session pools
                 Key: DROOLS-3412
                 URL: https://issues.jboss.org/browse/DROOLS-3412
             Project: Drools
          Issue Type: Bug
            Reporter: Christian Liebhardt
            Assignee: Mario Fusco


Hello,

We've today updates to Drools 7.15 and as discussed with DROOLS-3228 we changed our code from calling _StatefulKnowledgeSessionImpl.reset_ ourselves to _KieSessionsPool_. However we then recognized that our application quickly became slower and slower over time (roughly after a few minutes of uptime, or a couple of hundred session create/dispose cycles). 

I haven't yet found the reason what is causing the slow down. However I think there is a difference in how we reset our sessions before session pools and how session pools do it. Perhaps that is a lead.

*What we did*
# Create a session
# Use the session
# Dispose and reset the session and go back to 2 for the next facts

*What happens with session pools*
# Create a session
# Use the session
# Skip dispose (because of _pool != null_ in the dispose method), reset the session and go back to 2 for the next facts

So the difference seems to be that with session pools the session doesn't get disposed before reset it called. If I do the same without session pools then I also see the same slow down. So it seems that something is left behind and causes a slow down. The results however seem to be correct, so the right consequences appear to be triggered.

An example on how we use the session pool can be found here: https://github.com/liebharc/JavaRules/blob/master/src/main/java/com/github/liebharc/JavaRules/StatefulReusingDroolsEngine.java

Thanks once more for your help.



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