Tomcat example source code file (cluster-membership.xml)
The Tomcat cluster-membership.xml source code
<?xml version="1.0"?> <!-- Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --> <!DOCTYPE document [ <!ENTITY project SYSTEM "project.xml"> ]> <document url="cluster-membership.html"> &project; <properties> <author email="email@example.com">Filip Hanik <title>The Cluster Membership object </properties> <body> <section name="Introduction"> <p> The membership component in the Apache Tribes <a href="cluster-channel.html">Channel is responsible for dynamic discovery of other members(nodes) in the cluster. </p> </section> <section name="Default Implementation"> <p> The default implementation of the cluster group notification is built on top of multicast heartbeats sent using UDP packets to a multicast IP address. Cluster members are grouped together by using the same multicast address/port combination. Each member sends out a heartbeat with a given interval (<code>frequency), and this heartbeat is used for dynamic discovery. In a similar fashion, if a heartbeat has not been received in a timeframe specified by <code>dropTime ms. a member is considered suspect and the channel and any membership listener will be notified. </p> </section> <section name="Attributes"> <subsection name="Multicast Attributes"> <attributes> <attribute name="className" required="true"> <p> The default value is <code>org.apache.catalina.tribes.membership.McastService and is currently the only implementation. This implementation uses multicast heartbeats for member discovery. </p> </attribute> <attribute name="address" required="false"> <p> The multicast address that the membership will broadcast its presence and listen for other heartbeats on. The default value is <code>188.8.131.52 Make sure your network is enabled for multicast traffic.<br/> The multicast address, in conjunction with the <code>port is what creates a cluster group. To divide up your farm into several different group, or to split up QA from production, change the <code>port or the
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