On Tue, Jan 15, 2019, 3:14 PM Mark Thomas <ma...@apache.org wrote: > On 15/01/2019 18:36, Tim K wrote: > > > Question: what's considered a "large" cluster I've seen a lot of > > documentation about small vs large but I'd like to know what is > considered > > large. Could the DeltaManager handle one single cluster (all-to-all) > with > > 8 members with 8GB allocated to each jvm, separate servers? Not storing > > much in the session besides 3-4 short strings. > > It depends more on the frequency and size of session updates. > > With the DeltaManager traffic volume is proportional to n(n-1) where n > is the number of nodes. With the BackupManager it is proportional to n. > > With 8 nodes the DeltaManager generates 7 times the cluster traffic that > the BackManager generates. Whether your network will cope with that will > depend on the app and usage pattern. > > Mark > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org
With the DeltaManager, instead of it notifying all nodes when sessions get established, is there a way for it to only share that single node's sessions during a shutdown event of that particular node? For example, node 1 of 8 has 5 sessions on it. When node 1 is shut down, only then will it replicate those 5 sessions to the other 7 nodes... This would reduce the all-to-all traffic that would be occurring constantly but would put more weight on a shutdown event... Also, another wrinkle, the shutdown port is disabled in server.xml for security reasons.
