[rules-users] Garbage collection and sliding windows (Drools 5.5.0 Final)

[Matteo Cusmai]

Are you sure that you don't have any rule based on time and on these
events? From my experience the @expire annotation doesn't work if the event
could be used from some rules.
On 9 Feb 2013 14:26, "tai-atari" <p00temkin at gmail.com> wrote:

> Hi everyone,
>
> I'm currently doing some performance tests with Drools Fusion (5.5.0) and
> have run into some issues with EventFactHandles which are not being garbage
> collected. VisualVM tells me that for every 200k inserted events, about 15k
> EventFactHandle objects are still left as live objects.
>
> Current setup:
> 1) Drools 5.5.0 Final
> 2) Oracle JVM 1.7.0_06 on Windows 7
> 3) STREAM mode
> 4) 1 ksession at startup
> 5) 1 drl file with
> - a single sliding window "over window:time(10s)"
> - 1 entry-point
> - declared event class as '@role( event )'
> - only action being taken as events shows up is a println()
>
> Events are being expired (and removed) properly from the 10 second sliding
> window, which is verified by checking the
>
> getFactCount() from the WorkingMemoryEntryPoint. Iterating through all
> EventFactHandles also show that isExpired is false on all of them (and the
> count is correct). But even though the events are removed from the sliding
> window, they do not seem to be available to the GC.
>
> If dispose() is called on the ksession, garbage collection is performed
> properly. I get this same behavior with over "window:length" as well. And
> even without using sliding windows at all unless I specifically add a
> "@expires ( 1s )" to the event class declaration.
>
> Has anyone else seen this behavior? After a couple of million events the
> memory consumption becomes a pain and the only recovery action which seems
> to be available is to dispose the ksession and start over. This means state
> is lost and it requires the application to save and reinsert all facts to
> the ksession, then start adding events again.
>
> Any help on how to troubleshoot this further would be really appreciated.
>
>
>
> --
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> http://drools.46999.n3.nabble.com/Garbage-collection-and-sliding-windows-Drools-5-5-0-Final-tp4022183.html
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