Edson Tirelli [http://community.jboss.org/people/tirelli] replied to the discussion "How to configure and scale a large stateful CEP service?" To view the discussion, visit: http://community.jboss.org/message/554689#554689 -------------------------------------------------------------- That is a broad question! :) Regarding memory, we have customers with up to 32Gb of memory running Drools, although I am not aware of any actually using over 20Gb. On 64 bits machines there is no real problem in increasing the heap if the memory is available. Regarding topology, a WM can not be distributed over multiple JVMs. There is some research going on on using Infinispan cache, but there is nothing yet on versions up to Drools 5.1. I think it is important to realize that competing products in general split and execute each and every query in a separate space with its own "local" memory. An analogy would be to create a separate knowledge base in drools for each rule/query and then spawn a separate session for each kbase. This is obviously sub-optimal as we would not benefit from inter-rule optimizations. So, we will probably have to try tunning large use cases by creating multiple kbases of "related" rules. This would allow us to easily distribute each kbase over different JVMs with their respective sessions. HA is something we need to discuss in separate. The engine does not support HA internally as of 5.1. It can be implemented as a master/master HA using external tools, and that is how it is usually done today. Although, alternatives need to be developed for the future. -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/554689#554689] Start a new discussion in JBoss ESB Development at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]