Cross site replication requires totally connected graph of sites/routes ------------------------------------------------------------------------ Key: WFLY-1416 URL: https://issues.jboss.org/browse/WFLY-1416 Project: WildFly Issue Type: Enhancement Components: Clustering Affects Versions: 8.0.0.Alpha2 Reporter: Richard Achmatowicz Assignee: Paul Ferraro Priority: Major Cross site replication is configured using JGroups subsystem <relay/> and <remote-site/> elements to define sites and multicast relay routes between sites. Looking at a site/route configuration as a graph of nodes and edges, xsite only works if this graph is totally connected (i.e. every site has a defined direct route to every other site). This is because <site name> -> <site id> mappings are assigned per node, with no agreement on what is happening at other nodes. For example, this configuration works: <relay site="LON"> <remote-site name="NYC" .../> <remote-site name="SFO" .../> </relay> <relay site="NYC"> <remote-site name="LON" .../> <remote-site name="SFO" .../> </relay> <relay site="SFO"> <remote-site name="NYC" .../> <remote-site name="LON" .../> </relay> but this configuration does not: <relay site="LON"> <remote-site name="NYC" .../> <remote-site name="SFO" .../> </relay> <relay site="NYC"> <remote-site name="LON" .../> </relay> <relay site="SFO"> <remote-site name="LON" .../> </relay>