I Have setup 2 nodes in a cluster using Jboss 4.0.5 GA
My requirement is:
1. When the first node starts, it becomes the master and starts all my services
2. When the second node starts, it becomes the slave. This node must join the
cluster, but my services should not be started. This Slave node must wait to
start the services until it becomes the master
I am facing these problems:
1. In the slave node the log correctly shows "MyClusterService - Waiting to
acquire Master Status" message but MyClusterService gets started.
2. In order to control MyClusterService from getting started, I am depending
upon
if ( isMasterNode()) check in startService() method. It only controls my JMS
messges from getting published and MyClusterService gets started (which I am
able to view in JMX-console)
Tried to get Sample Applications with similar requirements, but unable to find.
Posting this after few days without help
1. Is using isMasterNode variable the only means to know whether
MyClusterService should be started or not, if so, what is the correct
design to control the service using the isMasterNode variable
2. Is there any other means through which I could control the service from not
getting started in the slave node, and start them in the master node.
Is my understanding and approach totally wrong on this? Please help
I have made the following code to implement this.:
| public class MyClusterService extends HAServiceMBeanSupport {
| private boolean isMasterNode = false;
| protected void startService() throws Exception {
| if (isMasterNode()) {
| log.info("MyClusterService Started Successfully");
| //Send JMS messages to indicate Service Started
| }else {
| log.info("MyClusterService - Waiting to acquire Master
Status");
| }
| }
| protected void stopService() {
| log.info("Stopping MyClusterService - If Slave is waiting it
will become master ");
| }
| public boolean isMasterNode() {
| return isMasterNode;
| }
| public void startSingleton() {
| isMasterNode = true;
| if (isMasterNode) {
| startService();
| }
| }
| public void stopSingleton() {
| stopService();
| isMasterNode=false;
| }
| }
|
jboss-service.xml
| <mbean code="org.jboss.ha.singleton.HASingletonController"
| name="my.com:service=MyService-HASingletonController">
|
| <depends>jboss:service=${jboss.partition.name:DefaultPartition}</depends>
| <depends>my.com:service=MyClusterService</depends>
| <attribute
| name="PartitionName">${jboss.partition.name:DefaultPartition}</attribute>
| <attribute
| name="TargetName">my.com:service=MyClusterService</attribute>
| <attribute name="TargetStartMethod">startSingleton</attribute>
| <attribute name="TargetStopMethod">stopSingleton</attribute>
| <!-- <attribute name="TargetStopMethodArgument">true</attribute> -->
| </mbean>
| <mbean code="com.my.cluster.MyClusterService"
| name="my.com:service=MyClusterService">
| <depends>my.com:service=OtherServices</depends>
| </mbean>
|
Thanks
Krithi
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