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<a href="http://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
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How to configure and scale a large stateful CEP service?
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created by <a href="http://community.jboss.org/people/jeffdelong">Jeff DeLong</a> in <i>JBoss ESB Development</i> - <a href="http://community.jboss.org/message/554681#554681">View the full discussion</a>
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<div class="jive-rendered-content"><p>The question is how to deploy and scale a large stateful CEP service. CEP services could be required to handle thousands or more events per minute, and hold millions of events in working memory (along with a huge number of facts). The memory requirements could be enormous (several gigabytes)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>An initial approach to these sorts of requirements is to deploy the CEP service on its own dedicated SOA-P server, and configure it's VM sizing appropriately. What would be reasonable here? I.e. what is the largest reasonable single server JVM configuration? 6 GB RAM, 8 GB RAM, ...?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>However, if the volume of events would overwhelm a single server, what are the options for scalability? Can a working memory be spread across VMs? Could Drools take advantage of a federated cache such as Infinispan? What other options are there to scale.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Even if a single server is capable of handling the load, what would a highly available topology look like? Could a second server be deployed with the same configuration, and configure a service invoker load balancing policy that always went to the first service if it were available?</p></div>
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