Arkady Perepelyuk [http://community.jboss.org/people/arkper] created the discussion "Re: Clustering strategy for jBPM5" To view the discussion, visit: http://community.jboss.org/message/625843#625843 -------------------------------------------------------------- Are you suggesting that this try-if-fail-retry approach should be used as a way to cluster a jBPM5 application? -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/625843#625843] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]

Arkady Perepelyuk [http://community.jboss.org/people/arkper] created the discussion "Re: Clustering strategy for jBPM5" To view the discussion, visit: http://community.jboss.org/message/625871#625871 -------------------------------------------------------------- I'm trying to achieve exactly what this thread is all about - have a cluster of several jBPM5 applications. They all areconnected to an enterprise service bus that can easily round-robin requests coming from the clustered web application. The exact use case is as follows: 1. jBPM5 Node 1 gets a request to create a process instance.There are several human tasks that need to be created - so Node 1 communicates to a cluster of Task Servers to have that done. 2. A user completes a human task which results in a Task server Node X communicating its completion to jBPM5 Node 2. The point that I'm trying to make is that unless the jBPM5 nodes share the same knowledge session, Node 2 will not be able to pick up the task completion event and move the process instance alone because the process instance would only be available to the node that had created it. So, as Gary Tse had suggested in the opening message, I tried session sharing by executing the following on each node: h6. StatefulKnowledgeSession ksession = JPAKnowledgeService.loadStatefulKnowledgeSession(1, kbase, config, env);  I reported the predictable failure due to optimistic locking not being the right strategy to handle concurrent updates from multiple nodes. So this isn't an option to build a clustered jBPM5 application. So I'm going to ask you again (I've asked you the same question in a different thread dedictaed to clustering) - what is your approach to building a clustered jBPM5 application for scalability and high availability? Every high volume mission critical enterprise application requires this as a matter of very high priority. -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/625871#625871] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]

Arkady Perepelyuk [http://community.jboss.org/people/arkper] created the discussion "Re: Clustering strategy for jBPM5" To view the discussion, visit: http://community.jboss.org/message/625899#625899 -------------------------------------------------------------- Mauricio: First of all, thank you very much for your time and desire to help. That's truly appreciated. What you seem to be missing though is that in order for a cluster totry and solve the scalability problem, only ONE, but ANY one, node should be able to process ANY given valid request. In your approach, ALL nodes would try and only one would succeed to process a request. Clearly, this wouldn't address the scalability concern since ALL nodes would be trying to do the job with only one succeeding and all the other ones wasting their resources while they could have been working on other concurrent requests which would have increased the overall cluster capacity. Your approach would probably address the fail-over concern somewhat, but not at all the scalability one... As a community, we should push the jBPM5 team very hard to introduce the clustering support into the product. They seem to take it for granted, but in my humble opinion, it's a huge void as it makes the product completely unfit for the enterprise-grade applications. -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/625899#625899] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]

Mauricio Salatino [http://community.jboss.org/people/salaboy21] created the discussion "Re: Clustering strategy for jBPM5" To view the discussion, visit: http://community.jboss.org/message/625902#625902 -------------------------------------------------------------- My opinion about the community is that we are the community and we don't need to push anyone we can introduce new mechanisms if we agree on the implementation and we make those improvements as community. I'm a community member and I tried to spend time fixing bugs and adding features, but sometimes is not enough :) Any help is appreciated and more than welcome. Best regards -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/625902#625902] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]