Hi Anuruddha, I have a question on this. If there are two application servers running in an AS cluster, isn't the topology identify both of them as active. If so, do you go for the highest IP?
On Mon, Jul 21, 2014 at 5:28 PM, Anuruddha Premalal <[email protected]> wrote: > Hi, > > *Problem:* > > In the current appfactory setup all the application containers (AS) > notifies on application life cycle events (deployment, undeployment); this > is because the deployment event listeners directly send messages to > appfactory . This approach works well for a single node deployment . But it > will cause unwanted noise (which will ultimately be several copies of the > same message on the notification wall) in a clustered environment, also > this will cause unwanted traffic towards appfactory. So it is important to > limit notifications from the container level. > > *Solution:* > > Requirement is to send notifications only from a single appserver node in > the cluster. > > For this we have to choose a single candidate from the cluster, and make > him as the notifier node. > > Candidate selection method: > > This can be achieved using Stratos topology information. Topology(which is > published every 60secs) have information about currently active cluster > nodes. > > Application notifiers will subscribe to this topology topic and choose to > be the notifier based on the following criteria. > > 1.) If the topology contains the IP of the node. > Note : This is important because there might be cases where IP is > not in the topology but the instance is active. > > 2.) If the IP is the highest IP in the available topology. > > > Related Jira : https://wso2.org/jira/browse/APPFAC-2271 > > > Regards, > > -- > *Anuruddha Premalal* > Software Eng. | WSO2 Inc. > Mobile : +94710461070 > Web site : www.regilandvalley.com > > "Advances of technology should not leave behind the developing world" > > _______________________________________________ > Architecture mailing list > [email protected] > https://mail.wso2.org/cgi-bin/mailman/listinfo/architecture > > -- *Amila Maharachchi* Senior Technical Lead WSO2, Inc.; http://wso2.com Blog: http://maharachchi.blogspot.com Mobile: +94719371446
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