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	<title>lizongbo at 618119.com &#187; JGroups</title>
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	<link>http://618119.com</link>
	<description>工作,生活,Android,前端,Linode,Ubuntu,nginx,java,apache,tomcat,Resin,mina,Hessian,XMPP,RPC</description>
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		<title>Jgroups配置与使用的学习笔记</title>
		<link>http://618119.com/archives/2007/11/24/29.html</link>
		<comments>http://618119.com/archives/2007/11/24/29.html#comments</comments>
		<pubDate>Sat, 24 Nov 2007 06:56:01 +0000</pubDate>
		<dc:creator>lizongbo</dc:creator>
				<category><![CDATA[Java]]></category>
		<category><![CDATA[JbossCache]]></category>
		<category><![CDATA[JGroups]]></category>

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		<description><![CDATA[Jgroups配置与使用的学习笔记 1.相关资料: 关于jgroups有几篇很好的中文介绍文章： Rene Xu 的《Multicast and JGroups（未完待续）》 http://renexu.blogspot.com/2006/08/multicast-and-jgroups_28.html 还有Tim 的《JGroups 简介、适用场合、配置、程序例子Demo等完全使用指南》 http://hi.baidu.com/jabber/blog/item/7e879852a23efd0f0cf3e3ea.html 和Puras 的《JGroups之皮毛》 http://www.javaeye.com/post/292587 IP组播技术概述的资料： http://net.pku.edu.cn/webCourse/ppt/lec14.pdf jgroups的向导： http://www.jgroups.org/javagroupsnew/docs/tutorial/html_single/index.html jgroups的用户手册： http://www.jgroups.org/javagroupsnew/docs/manual/html_single/index.html 2.jgroups 2.5及以上版本要求的jdk最低版本至少为JDK5.0，最小依赖的库文件为：commons-logging.jar, jgroups-all.jar是一个包含了demo和junit单元测试用例的jar,如果想得到精简了的jar， 则可以下载源代码下来，使用 jar 任务编译得到jgroups-core.jar 操作步骤如下，解压JGroups-2.5.0.src.zip，得到D:\Java\JGroups-2.5.0.src。 然后命令行下运行build jar。 [code] D:\Java\JGroups-2.5.0.src\lib&#62;cd .. D:\Java\JGroups-2.5.0.src&#62;build jar Buildfile: build.xml prepare: [mkdir] Created dir: D:\Java\JGroups-2.5.0.src\classes [mkdir] Created dir: D:\Java\JGroups-2.5.0.src\dist [mkdir] Created dir: D:\Java\JGroups-2.5.0.src\dist\javadoc compile: [javac] Compiling 508 [...]]]></description>
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		<item>
		<title>对tomcat cluster集群配置中session复制用法的一个误解</title>
		<link>http://618119.com/archives/2007/11/13/26.html</link>
		<comments>http://618119.com/archives/2007/11/13/26.html#comments</comments>
		<pubDate>Tue, 13 Nov 2007 00:34:48 +0000</pubDate>
		<dc:creator>lizongbo</dc:creator>
				<category><![CDATA[Apache]]></category>
		<category><![CDATA[Tomcat]]></category>
		<category><![CDATA[Web Server]]></category>
		<category><![CDATA[Cluster]]></category>
		<category><![CDATA[distributable]]></category>
		<category><![CDATA[JGroups]]></category>
		<category><![CDATA[jvmRoute]]></category>
		<category><![CDATA[loadbalancer]]></category>
		<category><![CDATA[mod_jk]]></category>
		<category><![CDATA[session复制]]></category>
		<category><![CDATA[Tribes]]></category>
		<category><![CDATA[负载均衡]]></category>
		<category><![CDATA[集群]]></category>

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		<description><![CDATA[一直以来，我误解认为启动了n个tomcat，则Session需要同步复制到n个Tomcat中存在，因此在启动了6个以上的Tomcat，性能会大大下降。 而实际情况下，采取Apache 加Tomcat进行负载均衡集群的时候，是可以不用将Session复制到所有的节点里， 比如有六个Tomcat实例 Tomcat1,Tomcat2,Tomcat3,Tomcat4,Tomcat5,Tomcat6 是可以配置成 三组互相复制Session的群组， 比如Tomcat1和Tomcat2互相同步Session, 比如Tomcat3和Tomcat4互相同步Session, 比如Tomcat5和Tomcat6互相同步Session. 再在Apache的mod_jk模块里，对每个worker配置上redirect和activation属性。 将Tomcat1,Tomcat3,Tomcat5做为对外正常提供服务器的Tomcat, Tomcat2,Tomcat4,Tomcat6作为分别对应的灾难恢复的备份Tomcat. 即比如Tomcat1当机之后，Apache会自动将发给Tomcat1的请求转发到Tomcat2上， 而Tomcat2因为同步了Tomcat1的Session信息，因此从用户的角度，是感觉不出任何差异的。 单纯的Tomcat测试如下： Tomcat配置： Tomcat1. port=&#8221;15080&#8243;, jvmRoute=&#8221;tomcat1&#8243;, &#60;Membership className=&#8221;org.apache.catalina.tribes.membership.McastService&#8221; address=&#8221;228.0.0.5&#8243; port=&#8221;45564&#8243; frequency=&#8221;500&#8243; dropTime=&#8221;3000&#8243;/&#62; Tomcat2. port=&#8221;16080&#8243;, jvmRoute=&#8221;tomcat2&#8243;, &#60;Membership className=&#8221;org.apache.catalina.tribes.membership.McastService&#8221; address=&#8221;228.0.0.5&#8243; port=&#8221;45564&#8243; frequency=&#8221;500&#8243; dropTime=&#8221;3000&#8243;/&#62; Tomcat3. port=&#8221;17080&#8243;, jvmRoute=&#8221;tomcat3&#8243;, &#60;Membership className=&#8221;org.apache.catalina.tribes.membership.McastService&#8221; address=&#8221;228.0.0.6&#8243; port=&#8221;45564&#8243; frequency=&#8221;500&#8243; dropTime=&#8221;3000&#8243;/&#62; Tomcat4. port=&#8221;18080&#8243;, jvmRoute=&#8221;tomcat4&#8243;, &#60;Membership className=&#8221;org.apache.catalina.tribes.membership.McastService&#8221; address=&#8221;228.0.0.6&#8243; port=&#8221;45564&#8243; frequency=&#8221;500&#8243; dropTime=&#8221;3000&#8243;/&#62; Tomcat5. port=&#8221;19080&#8243;, [...]]]></description>
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