[jboss-jira] [JBoss JIRA] (DROOLS-368) Memory leak mappedKnowledgeBaseListeners

[Mark Proctor (JIRA)]

     [ https://issues.jboss.org/browse/DROOLS-368?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mark Proctor reassigned DROOLS-368:
-----------------------------------

    Assignee: Petr Široký  (was: Mark Proctor)


> Memory leak mappedKnowledgeBaseListeners
> ----------------------------------------
>
>                 Key: DROOLS-368
>                 URL: https://issues.jboss.org/browse/DROOLS-368
>             Project: Drools
>          Issue Type: Bug
>    Affects Versions: 5.5.0.Final
>         Environment: Linex
>            Reporter: David Tse
>            Assignee: Petr Široký
>            Priority: Critical
>
> This leak is identified by getting a heap dump.  Analysis of the heap dump by Eclipse MAT puts org.drools.retoo.ReteooRuleBase as the prime suspect holding to 47.33% of the 870 MB heap memory with org.drools.retoo.ReteooStatefulSession adding to the problem accounting for an additional 5.25% of the memory leak. 
> Examination of the BRMS 5.5.0.Final source code indicates that SFT memory leaks are caused by issues associated with 7 classes in the drools-core module of the community version BRMS 5.5.0.Final.  These classes are
> •	org.drools.impl.KnowledgeBaseImpl.java
> •	org.drools.impl.StatefulKnowledgeSession.java
> •	org.drools.retoo.ReteooStatefulSession which extends org.drools.retoo.ReteooWorkingMemory.java which extends org.drools.common.AbstractWorkingMemory.java
> •	org.drools.retoo.ReteooRuleBase.java which extends org.drools.common.AbstractRuleBase.java
> The code in the community version has cyclic dependency and these developed into dying pointers. 
> 1.	org.drools.impl.KnowledgeBaseImpl$KnowledgeBaseEventListenerWrapper is holding a reference to this (KnowledgeBaseImpl)
> 2.	KnowledgeBaseImpl is holding a reference to RuleBase (ReteooRuleBase is the implementation class)
> 3.	ReteooRuleBase is holding a reference to org.drools.impl.KnowledgeBaseImpl$KnowledgeBaseEventListenerWrapper
> For the second leak, StatefulKnowledgeSessionImpl is holding a reference to ReteooWorkingMemory.  ReteooWorkingMemory is also holding a reference to StatefulKnowledgeSessionImpl.  



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