First experiments with Terracotta
Published by peter June 14th, 2007 in java.During the J-Spring conference yesterday I visited the session on Terracotta; I liked what I saw and started experimenting with it right away. Probably shouldn't have started with a complex application... had a lot of problems there.
I decided to step back a bit and set up two simple webapplications which put something in the session. Enabling terracotta requires a bit of JVM flag voodoo; I extended the VM arguments in Tomcats' launch configuration with the following:
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-Dcom.sun.management.jmxremote
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-Dcom.sun.management.jmxremote.port=8092 // [8091 for node1]
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-Dcom.sun.management.jmxremote.authenticate=false
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-Dcom.sun.management.jmxremote.ssl=false
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-Dtc.node-name=Node2 // [Node1 for node1]
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-Dtc.install-root=/Users/peter/downloads/terracotta-2.4-stable0/
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-Xbootclasspath/p:/Users/peter/downloads/terracotta-2.4-stable0/lib/dso-boot/dso-boot-hotspot_osx_150_07.jar
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-Dtc.config=/Users/peter/JavaApplications/sandbox/tc-config.xml
The referenced boot jar was generated using the make-boot-jar.sh script; it takes care of actually starting Terracotta when Tomcat starts. The config file (tc-config.xml) looks like this:
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<?xml version="1.0" encoding="UTF-8"?>
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<tc:tc-config xmlns:tc="http://www.terracotta.org/config"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://www.terracotta.org/schema/terracotta-3.xsd">
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<servers>
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<server host="%i" name="sample" />
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</servers>
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<clients>
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<logs>/Users/peter/JavaApplications/sandbox/log/%D</logs>
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</clients>
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<application>
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<spring>
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<jee-application name="*">
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<session-support>true</session-support>
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</jee-application>
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</spring>
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</application>
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</tc:tc-config>
Before starting the Tomcat instances part of the cluster I started the Terracotta server, which administers the cluster by using the start-tc-server.sh script supplied in the Terracotta bundle.
Since everything is wired up for JMX we can now view all statistics en statuses using JConsole:
So fare everything works as expected, session clustering works! Next steps will include EHCache, Hibernate, Lucene etc. I'll keep you posted!
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