A JGroups file depicting cross-datacentre failover

jgroups.xml

<config xmlns="urn:org:jgroups"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="urn:org:jgroups file:schema/JGroups-3.1.xsd">
    <TCP
            bind_addr="${jgroups.tcp.address:127.0.0.1}"
            bind_port="${jgroups.tcp.port:7800}"
            loopback="true"
            port_range="30"
            recv_buf_size="20m"
            send_buf_size="640k"
            discard_incompatible_packets="true"
            max_bundle_size="64000"
            max_bundle_timeout="30"
            enable_bundling="true"
            use_send_queues="true"
            enable_diagnostics="false"
            bundler_type="old"

            thread_naming_pattern="pl"

            thread_pool.enabled="true"
            thread_pool.min_threads="2"
            thread_pool.max_threads="30"
            thread_pool.keep_alive_time="60000"
            thread_pool.queue_enabled="true"
            thread_pool.queue_max_size="100"
            thread_pool.rejection_policy="Discard"

            oob_thread_pool.enabled="true"
            oob_thread_pool.min_threads="2"
            oob_thread_pool.max_threads="30"
            oob_thread_pool.keep_alive_time="60000"
            oob_thread_pool.queue_enabled="false"
            oob_thread_pool.queue_max_size="100"
            oob_thread_pool.rejection_policy="Discard"
            />

    <!-- Ergonomics, new in JGroups 2.11, are disabled by default in TCPPING until JGRP-1253 is resolved -->
    <!--
    <TCPPING timeout="3000"
             initial_hosts="localhost[7800],localhost[7801]"
             port_range="5"
             num_initial_members="3"
             ergonomics="false"
         />
    -->

    <MPING bind_addr="${jgroups.bind_addr:127.0.0.1}" break_on_coord_rsp="true"
           mcast_addr="${jgroups.mping.mcast_addr:228.2.4.6}"
           mcast_port="${jgroups.mping.mcast_port:43366}"
           ip_ttl="${jgroups.udp.ip_ttl:2}"
           num_initial_members="3"/>

    <MERGE2 max_interval="30000" min_interval="10000"/>
    <FD_SOCK/>
    <FD timeout="3000" max_tries="3"/>
    <VERIFY_SUSPECT timeout="1500"/>
    <pbcast.NAKACK2 use_mcast_xmit="false"
                    xmit_interval="1000"
                    xmit_table_num_rows="100"
                    xmit_table_msgs_per_row="10000"
                    xmit_table_max_compaction_time="10000"
                    max_msg_batch_size="100"/>

    <UNICAST2 stable_interval="5000"
              xmit_interval="500"
              max_bytes="1m"
              xmit_table_num_rows="20"
              xmit_table_msgs_per_row="10000"
              xmit_table_max_compaction_time="10000"
              max_msg_batch_size="100"/>
    <pbcast.STABLE stability_delay="500" desired_avg_gossip="5000" max_bytes="1m"/>
    <pbcast.GMS print_local_addr="false" join_timeout="3000" view_bundling="true"/>
    <UFC max_credits="200k" min_threshold="0.20"/>
    <MFC max_credits="200k" min_threshold="0.20"/>
    <FRAG2 frag_size="60000"/>
    <RSVP timeout="60000" resend_interval="500" ack_on_delivery="false" />
    <relay.RELAY2 site="LON" config="relay2.xml" relay_multicasts="false" />
</config>