Terracotta - JBoss AS - EJB3

I am going to use terracotta just to speed up the system.
I still need JBoss AS and its EJB 3 implementation.
Terracotta alone is too flexible which is not appropriate for agile development which heavily depends on forced blueprint like EJB to ensure design quality.

Terracotta. What?

While I am enjoying clustering solution using JBoss, I heard about terracotta. An interesting word, so I opened the website.

Somebody said terracotta hundreds time faster than JBoss clustering, and more transparent solution to clustering that the software components you build don't have to be EJBs. Well, I don't know yet.

I am very enthusiastic about learning terracotta tonight, but wait.. A friend needs me to compile and integrate our old java source code tonight :-(

jboss-web.xml for session replication

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

<!DOCTYPE jboss-web PUBLIC
"-//JBoss//DTD Web Application 5.0//EN"
"http://www.jboss.org/j2ee/dtd/jboss-web_5_0.dtd">

<jboss-web>
<replication-config>
<replication-trigger>SET_AND_NON_PRIMITIVE_GET</replication-trigger>
<replication-granularity>SESSION</replication-granularity>
<replication-field-batch-mode>true</replication-field-batch-mode>
</replication-config>
</jboss-web>

Installing Web Load Balancing to JBoss 5

After setting up JBoss clusters as explained in Setting up JBoss 5 AS cluster nodes, we can setup the web load balancing.

Install Apache 2. You can get it from http://httpd.apache.org.

Install mod_jk to the apache. You can get it from http://www.apache.org/dist/jakarta/tomcat-connectors/jk/binaries/

Let us say that you have added node1 in mod_jk installation. To the first node of your JBoss 5 cluster edit the file deployers/jbossweb.deployer/server.xml add attribute jvmRoute="node1" to the element <Engine>, so the element will look like this: <Engine name="jboss.web" defaultHost="localhost" jvmRoute="node1">.

Edit deployers/jbossweb.deployer/META-INF/war-deployers-beans.xml, to the bean WebAppClusteringDefaultsDeployer add property: true

Do the same to other nodes.

Edit your web applications web.xml. Add <distributable/>

Edit your web applications jboss-web.xml

Installing mod_jk

Get the mod_jk binary. You can get it from http://www.apache.org/dist/jakarta/tomcat-connectors/jk/binaries/.

Copy mod_jk.so to modules directory of your apache web server.

Put mod-jk.conf template in directory conf/extra of apache. Edit the file, replace MyApps with your application url string components.

Edit conf/httpd.conf, add one line: Include conf/extra/mod-jk.conf

Put uriworkermap.properties in directory conf/extra.

Put workers.properties in directory conf/extra. The template assuming that you have two nodes; node1 and node2 residing in host 172.16.1.37 and 172.16.1.195

workers.properties

# Define list of workers that will be used
# for mapping requests
worker.list=loadbalancer,status
# Define Node1
# modify the host as your host IP or DNS name.
worker.node1.port=8009
worker.node1.host=172.16.1.37
worker.node1.type=ajp13
worker.node1.lbfactor=1
worker.node1.cachesize=10

# Define Node2
# modify the host as your host IP or DNS name.
worker.node2.port=8009
worker.node2.host=172.16.1.195
worker.node2.type=ajp13
worker.node2.lbfactor=1
worker.node2.cachesize=10

# Load-balancing behaviour
worker.loadbalancer.type=lb
worker.loadbalancer.balance_workers=node1,node2
#worker.loadbalancer.balance_workers=node1
worker.loadbalancer.sticky_session=0

#worker.list=loadbalancer
# Status worker for managing load balancer
worker.status.type=status

uriworkermap.properties

# Simple worker configuration file
# Mount the Servlet context to the ajp13 worker
/jmx-console=loadbalancer
/jmx-console/*=loadbalancer
/web-console=loadbalancer
/web-console/*=loadbalancer