[jboss-jira] [JBoss JIRA] (DROOLS-4805) Memory leak in STREAM mode (# PointInTimeTriggers growing)

[Mario Fusco (Jira)]

     [ https://issues.redhat.com/browse/DROOLS-4805?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mario Fusco resolved DROOLS-4805.
---------------------------------
    Fix Version/s: 7.31.0.Final
       Resolution: Done


Fixed by https://github.com/kiegroup/drools/commit/f4bd8d80791fee7dcd8b35cfddee3bd2203aebbe

> Memory leak in STREAM mode (# PointInTimeTriggers growing)
> ----------------------------------------------------------
>
>                 Key: DROOLS-4805
>                 URL: https://issues.redhat.com/browse/DROOLS-4805
>             Project: Drools
>          Issue Type: Bug
>    Affects Versions: 7.29.0.Final
>            Reporter: Jesse White
>            Assignee: Mario Fusco
>            Priority: Major
>             Fix For: 7.31.0.Final
>
>         Attachments: image-2019-11-25-10-31-07-281.png
>
>
> When running our engine in STREAM mode, we notice a number of Drools internal object references increasing time even though the fact count stays relatively constant.
> jmap -histo <pid> shows:
> {noformat}
>  num     #instances         #bytes  class name
> ----------------------------------------------
>    1:      17478466     1258449552  java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask
>    2:      17475174      699006960  org.drools.core.time.impl.JDKTimerService$JDKJobHandle
>    3:      17762331      568394592  java.util.concurrent.ConcurrentHashMap$Node
>    4:      17475174      559205568  org.drools.core.rule.SlidingTimeWindow$BehaviorJobContext
>    5:      17475174      559205568  org.drools.core.time.impl.DefaultTimerJobInstance
>    6:       8596776      551411680  [C
>    7:      18898675      453568200  java.lang.Long
>    8:      17475174      419404176  org.drools.core.time.SelfRemovalJobContext
>    9:      17475174      279602784  org.drools.core.time.SelfRemovalJob
>   10:      17475174      279602784  org.drools.core.time.impl.PointInTimeTrigger
>   11:       9263698      222328752  java.lang.String
>   12:       4584671      146709472  java.util.HashMap$Node
>   13:        246658      138804176  [B
> {noformat}
> These number continue to increase over time until the system OOMs.
> Graph for # of facts in the session looks like:
>  !image-2019-11-25-10-31-07-281.png|thumbnail! 
> The engine is fairly busy - we're constantly adding and removing facts.
> Our rules are available here:
> https://github.com/OpenNMS/opennms/blob/opennms-25.0.0-1/opennms-base-assembly/src/main/filtered/etc/alarmd/drools-rules.d/alarmd.drl#L234



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