我正在本地机器上的 Tomcat 7 上设置集群/复制，以评估它以与我的环境/代码库一起使用。

设置

我在不同端口上运行的同级目录中有两个相同的 tomcat 服务器。我有 httpd 在其他两个端口上监听并作为 VirtualHosts 连接到两个 tomcat 实例。我可以在配置的端口上访问两个环境并与之交互；一切都按预期工作。

tomcat 服务器像这样在 server.xml 中启用了集群:

   <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
             channelSendOptions="8">

      <Manager className="org.apache.catalina.ha.session.DeltaManager"
               expireSessionsOnShutdown="false"
               notifyListenersOnReplication="true"/>

      <Channel className="org.apache.catalina.tribes.group.GroupChannel">
        <Membership className="org.apache.catalina.tribes.membership.McastService"
                    address="228.0.0.4"
                    port="45564"
                    frequency="500"
                    dropTime="3000"/>
        <Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
                  address="auto"
                  port="4001"
                  autoBind="100"
                  selectorTimeout="5000"
                  maxThreads="6"/>

        <Sender className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
          <Transport className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
        </Sender>
        <Interceptor className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
        <Interceptor className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>
      </Channel>

      <Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
             filter=""/>
      <Valve className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>

      <Deployer className="org.apache.catalina.ha.deploy.FarmWarDeployer"
                tempDir="/tmp/war-temp/"
                deployDir="/tmp/war-deploy/"
                watchDir="/tmp/war-listen/"
                watchEnabled="false"/>

      <ClusterListener className="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener"/>
      <ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/>
   </Cluster>

我在 web.xml 的开头添加了可分发标签:

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                      http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
  version="3.0">
  <distributable />

  (lots more...)

</web-app>

什么工作

当服务器启动时，它们会记录

Sep 16, 2013 1:44:23 PM org.apache.catalina.ha.tcp.SimpleTcpCluster startInternal
INFO: Cluster is about to start
Sep 16, 2013 1:44:23 PM org.apache.catalina.tribes.transport.ReceiverBase getBind
FINE: Starting replication listener on address:10.0.0.100
Sep 16, 2013 1:44:23 PM org.apache.catalina.tribes.transport.ReceiverBase bind
INFO: Receiver Server Socket bound to:/10.0.0.100:4001
Sep 16, 2013 1:44:23 PM org.apache.catalina.tribes.membership.McastServiceImpl setupSocket
INFO: Setting cluster mcast soTimeout to 500
Sep 16, 2013 1:44:23 PM org.apache.catalina.tribes.membership.McastServiceImpl waitForMembers
INFO: Sleeping for 1000 milliseconds to establish cluster membership, start level:4
Sep 16, 2013 1:44:24 PM org.apache.catalina.tribes.membership.McastServiceImpl waitForMembers
INFO: Done sleeping, membership established, start level:4
Sep 16, 2013 1:44:24 PM org.apache.catalina.tribes.membership.McastServiceImpl waitForMembers
INFO: Sleeping for 1000 milliseconds to establish cluster membership, start level:8
Sep 16, 2013 1:44:25 PM org.apache.catalina.tribes.membership.McastServiceImpl waitForMembers
INFO: Done sleeping, membership established, start level:8

当第二个服务器启动时，第一个记录日志

Sep 16, 2013 2:17:30 PM org.apache.catalina.tribes.group.interceptors.TcpFailureDetector messageReceived
FINE: Received a failure detector packet:ClusterData[src=org.apache.catalina.tribes.membership.MemberImpl[tcp://{10, 0, 0, 100}:4000,{10, 0, 0, 100},4000, alive=112208, securePort=-1, UDP Port=-1, id={118 6 107 -67 88 98 72 95 -73 41 4 -108 58 -5 -127 -41 }, payload={}, command={}, domain={}, ]; id={25 110 120 -2 -25 6 78 -97 -84 -34 2 -11 49 -62 -8 -56 }; sent=2013-09-16 14:17:30.139]
Sep 16, 2013 2:17:30 PM org.apache.catalina.tribes.transport.nio.NioReplicationTask remoteEof
FINE: Channel closed on the remote end, disconnecting
Sep 16, 2013 2:17:30 PM org.apache.catalina.tribes.membership.McastServiceImpl memberDataReceived
FINE: Mcast add member org.apache.catalina.tribes.membership.MemberImpl[tcp://{10, 0, 0, 100}:4001,{10, 0, 0, 100},4001, alive=1010, securePort=-1, UDP Port=-1, id={82 -45 -109 -56 -110 -5 78 -10 -103 61 -40 -59 -36 -79 104 120 }, payload={}, command={}, domain={}, ]
Sep 16, 2013 2:17:30 PM org.apache.catalina.ha.tcp.SimpleTcpCluster memberAdded
INFO: Replication member added:org.apache.catalina.tribes.membership.MemberImpl[tcp://{10, 0, 0, 100}:4001,{10, 0, 0, 100},4001, alive=1011, securePort=-1, UDP Port=-1, id={82 -45 -109 -56 -110 -5 78 -10 -103 61 -40 -59 -36 -79 104 120 }, payload={}, command={}, domain={}, ]

当一个关闭时，另一个记录

Sep 16, 2013 2:28:05 PM org.apache.catalina.tribes.membership.McastServiceImpl memberDataReceived
FINE: Member has shutdown:org.apache.catalina.tribes.membership.MemberImpl[tcp://{10, 0, 0, 100}:4001,{10, 0, 0, 100},4001, alive=422279, securePort=-1, UDP Port=-1, id={54 43 17 -9 13 -11 72 -63 -107 -78 -8 65 -21 -77 115 88 }, payload={}, command={66 65 66 89 45 65 76 69 88 ...(9)}, domain={}, ]
Sep 16, 2013 2:28:05 PM org.apache.catalina.tribes.group.interceptors.TcpFailureDetector memberDisappeared
INFO: Verification complete. Member disappeared[org.apache.catalina.tribes.membership.MemberImpl[tcp://{10, 0, 0, 100}:4001,{10, 0, 0, 100},4001, alive=422279, securePort=-1, UDP Port=-1, id={54 43 17 -9 13 -11 72 -63 -107 -78 -8 65 -21 -77 115 88 }, payload={}, command={66 65 66 89 45 65 76 69 88 ...(9)}, domain={}, ]]
Sep 16, 2013 2:28:05 PM org.apache.catalina.ha.tcp.SimpleTcpCluster memberDisappeared
INFO: Received member disappeared:org.apache.catalina.tribes.membership.MemberImpl[tcp://{10, 0, 0, 100}:4001,{10, 0, 0, 100},4001, alive=422279, securePort=-1, UDP Port=-1, id={54 43 17 -9 13 -11 72 -63 -107 -78 -8 65 -21 -77 115 88 }, payload={}, command={66 65 66 89 45 65 76 69 88 ...(9)}, domain={}, ]

所以我知道他们互相了解。

最后，当我使用 jconsole 中的 Cluster/Operations MBean 尝试将属性“foo”设置为“bar”时，jconsole 报告“方法成功调用”，并且服务器记录了日志

Sep 16, 2013 2:30:18 PM org.apache.catalina.ha.tcp.SimpleTcpCluster setProperty
WARNING: Dynamic setProperty(foo,value) has been disabled, please use explicit properties for the element you are trying to identify

我不太担心这个错误；主要用于演示 setProperty 创建日志语句。

什么不工作

据我所知，我的应用中没有复制任何 session 信息。

tomcat 管理器仅列出在其监控的服务器上启动的 session ，而不列出集群中的其他 session 。

我的印象是，每当应用程序调用 HttpSession.setAttribute 时，该属性应该被复制到其他集群节点，并且我希望会记录一些记录。我的应用包含这一行:

   public static void saveBillingInfo(IPageContext pageContext, BillingInfo billingInfo)
   {    
      pageContext.getSession().setAttribute("billingInfo", billingInfo);
      //etc...
   }

其中 BillingInfo 是一个 Serializable 类，它只包含一个字段，即有关帐单信息的信息的 HashMap。

当这个或任何其他线路处理时，不会写入任何日志语句，并且我没有看到任何证据表明 session 信息实际上正在被共享。

欢迎提出任何建议或进一步的问题。

最佳答案

我们遇到了同样的问题。虽然没有在任何地方记录，但为我解决的问题是将 标记从 server.xml 移动到全局 context.xml (将其从 ...... 组中取出并放入 组)。一旦我们这样做了，一切都“神奇地”开始工作。这仅适用于 Tomcat 7...Tomcat 6 与您在上面描述的设置(以及文档描述的)完美配合。

<Context>
    <Manager className="org.apache.catalina.ha.session.DeltaManager"
             expireSessionsOnShutdown="false"
             notifyListenersOnReplication="true" />
</Context>

现在只需从 server.xml 中的集群组中删除 标记即可。

关于java - Tomcat 的集群/ session 复制没有正确复制，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/18835014/