2:15 p.m.
Hi.
I'm running drools in a project with millions of facts to process. My memory
doesn't allow me to load all of my facts, so I have to load N objects at
once, then start over with next N objects, and so on.
Is it a good idea to let Drools to manage Pagination? I mean, create rules
in Drools with the purpose of loading facts?, or should I have to do this by
executing a Drools session from java in a loop?. My main goal is
performance.
Thanks!
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2:44 p.m.
Chances are high that you aren't asking the right question but based
on the meagre information you provide I can't even propose a better
question.
Consider not only loading but also unloading.
Does the logic for loading the next bunch of facts warrant rules?
-W
On 30/04/2012, mariofox <mariofox(a)gmail.com> wrote:
Hi.
I'm running drools in a project with millions of facts to process. My
memory
doesn't allow me to load all of my facts, so I have to load N objects at
once, then start over with next N objects, and so on.
Is it a good idea to let Drools to manage Pagination? I mean, create rules
in Drools with the purpose of loading facts?, or should I have to do this
by
executing a Drools session from java in a loop?. My main goal is
performance.
Thanks!
--
View this message in context:
http://drools.46999.n3.nabble.com/Rule-to-load-facts-with-pagination-tp39...
Sent from the Drools: User forum mailing list archive at Nabble.com.
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11:22 a.m.
I agree with Wolfgang that we need more information, but here's two general pieces of
advice:
1) If the object loading involves little or no business logic then do it from java. (i.e.
it's "load 10000 objects and go")
2) It's usually more efficient to dispose of a session than to remove all objects from
a session's working memory and reuse it. So if that fits your needs it's the best
route. And if objects can be arbitrarily divided up in that way the problem is highly
parallel, and you can take advantage of that by running the sessions in multiple
threads/hosts.
--- On Mon, 4/30/12, Wolfgang Laun <wolfgang.laun(a)gmail.com> wrote:
From: Wolfgang Laun <wolfgang.laun(a)gmail.com>
Subject: Re: [rules-users] Rule to load facts with pagination
To: "Rules Users List" <rules-users(a)lists.jboss.org>
Date: Monday, April 30, 2012, 2:44 PM
Chances are high that you aren't
asking the right question but based
on the meagre information you provide I can't even propose a
better
question.
Consider not only loading but also unloading.
Does the logic for loading the next bunch of facts warrant
rules?
-W
On 30/04/2012, mariofox <mariofox(a)gmail.com>
wrote:
> Hi.
>
> I'm running drools in a project with millions of facts
to process. My
> memory
> doesn't allow me to load all of my facts, so I have to
load N objects at
> once, then start over with next N objects, and so on.
>
> Is it a good idea to let Drools to manage Pagination? I
mean, create rules
> in Drools with the purpose of loading facts?, or should
I have to do this
> by
> executing a Drools session from java in a loop?. My
main goal is
> performance.
>
> Thanks!
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/Rule-to-load-facts-with-pagination-tp39...
> Sent from the Drools: User forum mailing list archive
at Nabble.com.
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
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12:07 p.m.
Not sure if I am right but I believe he has a memory restriction which forces
him not to be able to load a full result set from a query and then feed this
objects into the engine as facts. Unless you have some complicated logic I
would probably do the loading logic outside of the rules. Feed X number of
your objects into your session, fire the rules in the session, then dispose
of the session and start all over for the next X objects.
laune wrote
Chances are high that you aren't asking the right question but based
on the meagre information you provide I can't even propose a better
question.
Consider not only loading but also unloading.
Does the logic for loading the next bunch of facts warrant rules?
-W
On 30/04/2012, mariofox <mariofox@> wrote:
> Hi.
>
> I'm running drools in a project with millions of facts to process. My
> memory
> doesn't allow me to load all of my facts, so I have to load N objects at
> once, then start over with next N objects, and so on.
>
> Is it a good idea to let Drools to manage Pagination? I mean, create
> rules
> in Drools with the purpose of loading facts?, or should I have to do this
> by
> executing a Drools session from java in a loop?. My main goal is
> performance.
>
> Thanks!
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/Rule-to-load-facts-with-pagination-tp39...
> Sent from the Drools: User forum mailing list archive at Nabble.com.
> _______________________________________________
> rules-users mailing list
> rules-users@.jboss
> https://lists.jboss.org/mailman/listinfo/rules-users
>
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3 comments
4 participants
participants (4)
-
gboro54 -
Greg Barton -
mariofox -
Wolfgang Laun