Automatic Scaling an Application using WebLogic by René van Wijk
By Juergenkress-Oracle on Feb 20, 2014
we want to add (or start) managed server instances when running an
application, for example, when the number of open sessions reach a
certain value. For this value we have calculated that the memory
consumption is beyond a level, such that the garbage collection is
affected. By adding (or starting) a new server we balance the load (the
number of sessions with its corresponding memory consumption) across
multiple servers. By using the WebLogic Diagnostic Framework, we can
collect the metrics we need and create a watch for that metric with a
corresponding notification. By using this notification we can then
further create the logic needed in order to add (or start) a managed
server. For example, by using the notification service that come with
the WebLogic Diagnostic Framework we can send a JMS message or a JMX
notification. In this post we are going to use the JMS approach.
Environment The WebLogic environment consists of a cluster, spanning two
machines, and consisting of four managed servers. This can be easily
set-up by using the scripts presented in the post Automate WebLogic
12.1.2 Deployment. The diagnostic module is configured as follows - See
more at: Read the complete article here.
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