[jboss-jira] [JBoss JIRA] (WFLY-1416) Cross site replication requires totally connected graph of sites/routes

[Richard Achmatowicz (JIRA)]

Richard Achmatowicz created WFLY-1416:
-----------------------------------------

             Summary: 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: Bug
          Components: Clustering
    Affects Versions: 8.0.0.Alpha2
            Reporter: Richard Achmatowicz
            Assignee: Paul Ferraro


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>



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