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<a href="https://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
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PM Clustering strategy for jBPM5
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created by <a href="https://community.jboss.org/people/newbird">new bee</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/750242#750242">View the full discussion</a>
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<div class="jive-rendered-content"><p>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:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>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.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>2. A user completes a human task which results in a Task server Node X communicating its completion to jBPM5 Node 2.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>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:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>StatefulKnowledgeSession ksession = JPAKnowledgeService.loadStatefulKnowledgeSession(1, kbase, config, env);</p><p></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>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.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span>I am reposting the existing question as i do not find the appropriate answer at this link : </span><a class="jive-link-external-small" href="https://community.jboss.org/thread/169261?start=0&tstart=0" target="_blank">https://community.jboss.org/thread/169261?start=0&tstart=0</a></p></div>
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<p style="margin: 0;">Reply to this message by <a href="https://community.jboss.org/message/750242#750242">going to Community</a></p>
<p style="margin: 0;">Start a new discussion in jBPM at <a href="https://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2034">Community</a></p>
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