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  1. Follow the steps documented under Downloading & Installing to install a copy of  on each machine.
  2. Edit <frevvo-home>/frevvo/tomcat/config/server.xmlin each installation to:
    1. Setup the AJP jvmRoute
    2. Uncomment the <Cluster> element
    3. Change the value of the channelSendOptions="8"> in the cluster section to 6. This makes sure that session replication is synchronous and messages are not received out of order.
  3. Edit <frevvo-home>/frevvo/tomcat/bin/setenv.bat on windows or setenv.sh on linux to add cluster setenv parameters.
  4. Edit <frevvo-home/frevvo/tomcat/conf/Catalina/localhost/frevvo.xml 
    1. Uncomment the <Manager> element for DeltaManager.
    2. Ensure that the form server's database configured in frevvo.xml is the same database used for ALL cluster nodes.

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Code Block
<!-- 
   <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
                 channelSendOptions="86">
          <Channel className="org.apache.catalina.tribes.group.GroupChannel">
            <Membership className="org.apache.catalina.tribes.membership.McastService"
                        address="228.0.0.4"
                        port="55555"
                        frequency="500"
                        dropTime="3000"/>
            <Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
                      address="auto"
                      port="4000"
                      autoBind="100"
                      selectorTimeout="5000"
                      maxThreads="6"/>
            <Sender className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
              <Transport className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
            </Sender>
            <Interceptor className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
            <Interceptor className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>
          </Channel>
          <Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
                 filter=""/>
          <Valve className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>
          <ClusterListener className="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener"/>
          <ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/>
      </Cluster>
 -->

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  • retry (default 60secs) - "Connection pool worker retry timeout in seconds. If the connection pool worker to the backend server is in the error state, Apache will not forward any requests to that server until the timeout expires. This enables to shut down the backend server for maintenance, and bring it back online later. A value of 0 means always retry workers in an error state with no timeout."
  • ping (not set by default)- "Ping property tells the web server to send a CPING request on ajp13 connection before forwarding a request. The parameter is the delay in seconds to wait for the CPONG reply. This feature has been added to avoid problems with hung and busy Tomcat 's and require ajp13 ping/pong support which has been implemented on Tomcat 3.3.2+, 4.1.28+ and 5.0.13+. This will increase the network traffic during the normal operation which could be an issue, but it will lower the traffic in case some of the cluster nodes are down or busy. Currently this has an effect only for AJP. By adding a postfix of ms the delay can be also set in milliseconds."

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