[jboss-jira] [JBoss JIRA] (DROOLS-1014) Drools OOM when loading session

[Artur Kronenberg (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-1014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13143692#comment-13143692 ] 

Artur Kronenberg commented on DROOLS-1014:
------------------------------------------

Apologize for the spammyness of this, but I did some more digging. The rule I posted has one more rule, however I believe it to be not important because there should be no way of this to ever be called. this rule exists in similar form for 5 different groups. 

The complete rule: http://pasted.co/0f218b41 (I ran out of free pastebins...) 

For some reason, if only rule "Insert new MainFacts" exists in my drl file, the code runs quickly and without a problem. 
Adding rule "Group bucket 1 MainFact staggered" however hangs the entire process. Looking at my memory, it does indeed eat up 4.5 GB (I increased the heap even more just to see what happens). 
So I am now confused as to what my second rule is doing? The "EntryPointEventB" is not inserted. I only insert 1 event into EntryPointA, then fireAllRules(). Somehow, the second rule seems to be executed and doing weird things, even though EventB is never inserted so the rule could never be matched. My logging listener also never prints that a different rule other than the inserting one is invoked. 



> Drools OOM when loading session
> -------------------------------
>
>                 Key: DROOLS-1014
>                 URL: https://issues.jboss.org/browse/DROOLS-1014
>             Project: Drools
>          Issue Type: Bug
>          Components: core engine
>    Affects Versions: 6.3.0.Final
>         Environment: Mac OS 10.10.5, Eclipse Mars Release, Java 1.8, Drools 6.3.0.Final
>            Reporter: Artur Kronenberg
>            Assignee: Mario Fusco
>            Priority: Critical
>
> I ran into an issue loading the session from my JPA.
> I am getting this stacktrace:
> http://pastebin.com/PMKpdBWM
> This is happening for this rule: 
> http://pastebin.com/HZmLmsEH
> And this module:
> http://pastebin.com/2Q6k73tC
> What I am doing is: 
> 1. Create a new session
> 2. Insert an ApplicationEvent 
> 3. fireAllRules
> 4. Reload -> OOM 
> The ApplicationEvent has a list of 6345 facts in there. I load them from a CSV file, and use drools to insert them into my knowledge base as facts. 
> When I restart my server and have the session reloaded, it ooms when trying to deserialize the session. 
> I am still looking for a workaround. I am not sure what is happening and could not find any more info at this point.
> I am using:
> JPA + Hibernate 4.2.21.Final
> org.codehaus.btm:btm:2.1.4 as a standalone JTA platform 
> Let me know if there's any other info needed.
> Thanks,
> Artur



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