This is the asynchronous replication mode that we recommend for you to run. Usually, we'd recommend to consider using asyncrhonous mode for http session replication.

<?xml version="1.0" encoding="UTF-8"?>

<!-- ===================================================================== -->
<!--                                                                       -->
<!--  Customized TreeCache Service Configuration for Tomcat 5 Clustering   -->
<!--                                                                       -->
<!-- ===================================================================== -->

<server>

    <!-- ==================================================================== -->
    <!-- Defines TreeCache configuration                                      -->
    <!-- ==================================================================== -->

    <mbean code="org.jboss.cache.TreeCache"
        name="jboss.cache:service=TomcatClusteringCache">

        <depends>jboss:service=Naming</depends>
        <depends>jboss:service=TransactionManager</depends>

        <!-- Configure the TransactionManager -->
        <attribute name="TransactionManagerLookupClass">org.jboss.cache.JBossTransactionManagerLookup</attribute>

        <!--
            Isolation level : SERIALIZABLE
                              REPEATABLE_READ (default)
                              READ_COMMITTED
                              READ_UNCOMMITTED
                              NONE
        -->
        <attribute name="IsolationLevel">REPEATABLE_READ</attribute>

        <!--
             Valid modes are LOCAL, REPL_ASYNC and REPL_SYNC
        -->
        <attribute name="CacheMode">REPL_ASYNC</attribute>
        
        <!-- Name of cluster. Needs to be the same for all clusters, in order
             to find each other
        -->
        <attribute name="ClusterName">Tomcat-Cluster</attribute>

        <!-- JGroups protocol stack properties. Can also be a URL,
             e.g. file:/home/bela/default.xml
           <attribute name="ClusterProperties"></attribute>
        -->

        <attribute name="ClusterConfig">            
            <config>                
                <UDP mcast_addr="${jboss.partition.udpGroup:230.1.2.7}" 
                     mcast_port="45589"
                     ucast_recv_buf_size="20000000"
                     ucast_send_buf_size="640000"
                     mcast_recv_buf_size="25000000" 
                     mcast_send_buf_size="640000" 
                     loopback="false" 
                     max_bundle_size="64000" 
                     max_bundle_timeout="30" 
                     use_incoming_packet_handler="false" 
                     use_outgoing_packet_handler="false" 
                     ip_ttl="2" 
                     down_thread="false" up_thread="false"
                     enable_bundling="false"></UDP>
                <PING timeout="2000"
                      down_thread="false" up_thread="false" num_initial_members="3"></PING>
                <MERGE2 max_interval="100000"
                        down_thread="false" up_thread="false" min_interval="20000"></MERGE2>
                <FD_SOCK down_thread="false" up_thread="false"></FD_SOCK>
                <FD down_timeout="10000" max_tries="5" thread="false" up_thread="false"></FD>
                <VERIFY_SUSPECT timeout="1500"
                        up_thread="false" down_thread="false"></VERIFY_SUSPECT>
                <pbcast.NAKACK max_xmit_size="55000"
                               use_mcast_xmit="false" gc_lag="50" 
                               retransmit_timeout="100,200,300,600,1200,2400,4800" 
                               down_thread="false" up_thread="false"
                               discard_delivered_msgs="true"></pbcast>
                <UNICAST timeout="300,600,1200,2400,3600" 
                         down_thread="false" up_thread="false"></UNICAST>
                <pbcast.STABLE stability_delay="1000" desired_avg_gossip="50000" 
                               down_thread="false" up_thread="false"
                               max_bytes="400000"></pbcast>
                <pbcast.GMS print_local_addr="true" join_timeout="3000" 
                            down_thread="false" up_thread="false"
                            join_retry_timeout="2000" shun="true"></pbcast>
                <FC max_credits="2000000" down_thread="false" up_thread="false"
                    min_threshold="0.10"></FC>
                <FRAG2 frag_size="55000" down_thread="false" up_thread="false"></FRAG2>
                <pbcast.STATE_TRANSFER down_thread="false" up_thread="false"></pbcast>
            </config>
        </attribute>

        <!-- Max number of milliseconds to wait for a lock acquisition -->
        <attribute name="LockAcquisitionTimeout">15000</attribute>

    </mbean>

</server>

Referenced by: