Re: [rules-users] drools grid or other high availability solution?
you can do this yourself.
-setup 1..n JVMs.
-Each JVM creates a drools instance with the same rules
-Create an facade interface where external application insert/update/retract are actually
operations on an infinispan replication group.
-Each JVM attaches an insert/update/delete listener to the infinispan client, the listener
translates the infinispan event into a working memory action. This allows all JVM's in
the group to operate in redundancy.
-Make sure that any rules that have external side effects - like calling services - have
an "if master" check, as you don't want the slave JVM's doing any
external side effects. However you will need to make sure any return information from that
side effect is replicate to all JVMS in the group. Either ISPN already has heart group
management for master/slave, or you can use the underlying jgroups to do it.
If someone gets this working, they should probably publish it on github as an example
project.
Mark
On 12 Nov 2012, at 15:29, groovenarula <gnarula1(a)la-z-boy.com> wrote:
Follow up on high availability -
I'm planning to use Drools for Capacity Management. In my use-case I need to
track # of hours of planned capacity that has been consumed based on hours
allocated. I'm planning on having a StatefulKnowledgeSession that will have
facts that store the # of hours of capacity that are available for a given
week. Then as work comes in (in the form of orders), it will be allocated
against this capacity. Even though at a high level this seems to be a simple
requirement, the process of allocating resources is very complicated and
using rules and FOL would greatly help manage the complexity of the
allocation process.
Based on the discussion above it looks like I won't be able to architect a
solution that's highly available. I'm not concerned about performance (the
drools engine is very efficient even on a single server). But it looks like
it's not possible to share / replicate session state contained in a
StatefulKnowledgeSession across separate JVMs (either on the same server or
across 2 servers).
Am I correct or am I missing something ?
--
View this message in context:
http://drools.46999.n3.nabble.com/rules-users-drools-grid-or-other-high-a...
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