The title of rolling upgrades of JBossAS itself seems to be a difficult topic to search for (they all come up on how to do application rolling upgrades). Although it appears to be self-explanatory, would like any experiences, articles, blogs, or documentation related to using mod_cluster and trying to upgrade JbossAS itself in a no-downtime/rolling-upgrade scenario.
And, along those lines, if it is possible to 'upgrade' mod_cluster in a no-downtime scenario as well should the need arise.
Thanks for any feedback/input!
For mod_cluster if you roll an upgrade of the java part it is just like the AS upgrade for the httpd part it works if you have more than one httpd running.