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The "TomcatGridDiscussion" page has been changed by theimpaler: https://wiki.apache.org/tomcat/TomcatGridDiscussion?action=diff&rev1=8&rev2=9 * '''Stopped''': the instance OS process does not exist, and therefore the instance is not operating at all. + * '''Not Available''': This is a pseudo state that the manager applications (web and cli) show when a Grid Agent does not respond to requests for status in a timely manner. + * If possible it would be great to discern different sub cases of the Zoetic state, so to help the user to determine what's going on and tackle the case accordingly: * '''Starting''': The Tomcat instance process exists, and the instance is starting. It's not yet serving HTTP requests. * '''Stopping''': The Tomcat instance process exists, and the instance is stopping. It's no longer serving HTTP requests. * '''Unresponsive''': The Tomcat instance process exists, but the instance health isn't good, it's not responding to HTTP requests, or it's overwhelmed. It's not even responding to requests for status. + + * On second thoughts, these extra states can actually be discerned today with the current version of Tomcat, since the Grid Agents know all the trigger commands each local instance has received and can deduce (or make up) the sub case. If the Grid Agent is restarted, some kind of persistence of its state might be needed to "remember" what was going on before the Grid Agent was shut down, so to make an educated guess. + 1. Grid Agents communicate over unsecured TCP sockets, and assume communication security is enforced by the network architecture (segregated segments/VLans). 1. The "trigger"-type commands just deliver the corresponding signal to the instance's Grid Agent and returns right away, without waiting for the full operation to complete. It's kind of "fire and forget". The web user can keep on refreshing the the web interface to find out about the progress of the status of the Tomcat instances. --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@tomcat.apache.org For additional commands, e-mail: dev-h...@tomcat.apache.org
