27.3. Configure Cross-Datacenter Replication

Procedure 27.1. Set Up Cross-Datacenter Replication

1. Set Up RELAY

   Add the following configuration to the standalone.xml file to set up RELAY:

   <subsystem xmlns="urn:jboss:domain:jgroups:1.2" 
   	   default-stack="udp">
   	<stack name="udp">
   		<transport type="UDP" 
   			   socket-binding="jgroups-udp"/>
   		...
   		
   		<relay site="LON">
   		   <remote-site name="NYC" stack="tcp" cluster="global"/>
   		   <remote-site name="SFO" stack="tcp" cluster="global"/>
   		   <property name="relay_multicasts">false</property>
   		</relay>
   	</stack>
   </subsystem>
   

   The RELAY protocol creates an additional stack (running parallel to the existing TCP stack) to communicate with the remote site. If a TCP based stack is used for the local cluster, two TCP based stack configurations are required: one for local communication and one to connect to the remote site. For an illustration, see Section 27.2, “Cross-Datacenter Replication Operations”

2. Set Up Sites

   Use the following configuration in the standalone.xml file to set up sites for each distributed cache in the cluster:

   <distributed-cache>
        ...
        <backups>
           <backup site="{FIRSTSITENAME}" strategy="{SYNC/ASYNC}" />
           <backup site="{SECONDSITENAME}" strategy="{SYNC/ASYNC}" />
        </backups>
   </distributed-cache>
   

3. Configure Local Site Transport

   Add the name of the local site in the transport element to configure transport:

   <transport executor="infinispan-transport" 
              lock-timeout="60000" 
              cluster="LON" 
              stack="udp"/>