[rules-users] Is a single StatefulKnowledgeSession with Distributed Memory cache possible?

[Mauricio Salatino]

Yes, that's another option too.. it really depends on how you can
accumulate data or split your data to be analyzed.
Cheers

On Thu, Jun 14, 2012 at 1:22 PM, Vincent LEGENDRE <
vincent.legendre at eurodecision.com> wrote:

> May be you can think differently : Instead of keeping all objects for 90
> days, keep only the accumulate results for each previous day.
>
> ----- Mail original -----
> De: "chrisLi" <shengtao0077 at 163.com>
> À: rules-users at lists.jboss.org
> Envoyé: Jeudi 14 Juin 2012 18:06:50
> Objet: [rules-users] Is a single StatefulKnowledgeSession with Distributed
> Memory cache possible?
>
> Hi All,
>
>     I am working on a banking fraud detection project with Drools Fusion,
> which will match a transaction against hunreds of rules to check whether
> the
> transaction is suspicious.
>
>     In some rules, I use time-based sliding window to calculate the average
> transaction amount of an account in the past 3 or 6 months. One possible
> rule will be as below:
>
>    rule "Single Large Amount Transaction"
>    dialect "mvel"
>    when
>        $account : Account($number : number)
>        $averageAmount : BigDecimal() from accumulate(
>            TransactionCompletedEvent(fromAccountNumber == $account.number,
> $amount : amount)
>            over window:time(90d)
>            from entry-point TransactionStream,
>            bigDecimalAverage($amount))
>        $t1 : TransactionCreatedEvent(fromAccountNumber == $account.number,
>            amount > $account.creditAmount * 0.5, amount > $averageAmount *
> 3.0)
>           from entry-point TransactionStream
>    then
>    end
>
>    In such cases, the Fusion Engine will hold TransactionCompletedEvent in
> its memory for 90 days. And we have about 1 billion Accounts in total, so
> the TransactionCompletedEvent will be huge, we will very soon run out of
> memory.
>
>    I have been blocked here for a long time! Is it possible to distribute a
> single StatefulKnowledgeSession in multiple JVMs or machines using
> Distributed Memory cache such as Hazelcast? If yes, could you give me some
> opinion on the solution? Or is this the problem the Drools Grid project try
> to handle? Or there are other techonology to handle large numbers of facts
> or events problem?
>
>    As far as I know, Drools Grid distribute multilple ksessions on multiple
> machines in the Grid, each or several kseesions on one node? Is my
> understandings right?
>
>    Any response or opinion from you will be appriciated! Thank you very
> much!
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/Is-a-single-StatefulKnowledgeSession-with-Distributed-Memory-cache-possible-tp4017968.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
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