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From Ismaël Mejía <ieme...@gmail.com>
Subject Re: Integrating Flink CEP with a Rules Engine
Date Fri, 23 Jun 2017 12:43:19 GMT

It is really interesting to see this discussion because that was one
of the questions on the presentation on CEP at Berlin Buzzwords, and
this is one line of work that may eventually make sense to explore.

Rule engines like drools implement the Rete algorithm that if I
understood correctly optimizes the analysis of a relatively big set of
facts (conditions) into a simpler evaluation graph. For more details
this is a really nice explanation.

On flink's CEP I have the impression that you define this graph by
hand. Using a rule engine you could infer an optimal graph from the
set of rules, and then this graph could be translated into CEP

Of course take all of this with a grain of salt because I am not an
expert on both CEP or the Rete algorithm, but I start to see the
connection of both worlds more clearly now. So if anyone else has
ideas of the feasibility of this or can see some other
issues/consequences please comment. I also have the impression that
distribution is less of an issue because the rete network is
calculated only once and updates are not 'dynamic' (but I might be


ps. I add Thomas in copy who was who made the question in the
conference in case he has some comments/ideas.

On Fri, Jun 23, 2017 at 1:48 PM, Kostas Kloudas
<k.kloudas@data-artisans.com> wrote:
> Hi Jorn and Sridhar,
> It would be worth describing a bit more what these tools are and what are
> your needs.
> In addition, and to see what the CEP library already offers here you can
> find the documentation:
> https://ci.apache.org/projects/flink/flink-docs-release-1.3/dev/libs/cep.html
> Thanks,
> Kostas
> On Jun 23, 2017, at 1:41 PM, Jörn Franke <jornfranke@gmail.com> wrote:
> Hallo,
> It si possible, but some caveat : flink is a distributed system, but in
> drools the fact are only locally available. This may lead to strange effects
> when rules update the fact base.
> Best regards
> On 23. Jun 2017, at 12:49, Sridhar Chellappa <flinkenthu@gmail.com> wrote:
> Folks,
> I am new to Flink.
> One of the reasons why I am interested in Flink is because of its CEP
> library. Our CEP logic comprises of a set of complex business rules which
> will have to be managed (Create, Update, Delete) by a bunch of business
> analysts.
> Is there a way I can integrate other third party tools (Drools, OpenRules)
> to let Business Analysts define rules and  execute them using Flink's CEP
> library?

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