| [66] | 1 | <html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat Configuration Reference - The ClusterManager object</title><meta value="Filip Hanik" name="author"><meta value="fhanik@apache.org" name="email"></head><body vlink="#525D76" alink="#525D76" link="#525D76" text="#000000" bgcolor="#ffffff"><table cellspacing="0" width="100%" border="0"><!--PAGE HEADER--><tr><td><!--PROJECT LOGO--><a href="http://tomcat.apache.org/"><img border="0" alt=" |
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| 2 | The Apache Tomcat Servlet/JSP Container |
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| 3 | " align="right" src="../images/tomcat.gif"></a></td><td><font face="arial,helvetica,sanserif"><h1>Apache Tomcat 6.0</h1></font></td><td><!--APACHE LOGO--><a href="http://www.apache.org/"><img border="0" alt="Apache Logo" align="right" src="../images/asf-logo.gif"></a></td></tr></table><table cellspacing="4" width="100%" border="0"><!--HEADER SEPARATOR--><tr><td colspan="2"><hr size="1" noshade></td></tr><tr><!--LEFT SIDE NAVIGATION--><td nowrap="true" valign="top" width="20%"><p><strong>Links</strong></p><ul><li><a href="../index.html">Docs Home</a></li><li><a href="index.html">Config Ref. Home</a></li></ul><p><strong>Top Level Elements</strong></p><ul><li><a href="server.html">Server</a></li><li><a href="service.html">Service</a></li></ul><p><strong>Executors</strong></p><ul><li><a href="executor.html">Executor</a></li></ul><p><strong>Connectors</strong></p><ul><li><a href="http.html">HTTP</a></li><li><a href="ajp.html">AJP</a></li></ul><p><strong>Containers</strong></p><ul><li><a href="context.html">Context</a></li><li><a href="engine.html">Engine</a></li><li><a href="host.html">Host</a></li><li><a href="cluster.html">Cluster</a></li></ul><p><strong>Nested Components</strong></p><ul><li><a href="globalresources.html">Global Resources</a></li><li><a href="loader.html">Loader</a></li><li><a href="manager.html">Manager</a></li><li><a href="realm.html">Realm</a></li><li><a href="resources.html">Resources</a></li><li><a href="valve.html">Valve</a></li></ul><p><strong>Cluster Elements</strong></p><ul><li><a href="cluster.html">Cluster</a></li><li><a href="cluster-manager.html">Manager</a></li><li><a href="cluster-channel.html">Channel</a></li><li><a href="cluster-membership.html">Channel/Membership</a></li><li><a href="cluster-sender.html">Channel/Sender</a></li><li><a href="cluster-receiver.html">Channel/Receiver</a></li><li><a href="cluster-interceptor.html">Channel/Interceptor</a></li><li><a href="cluster-valve.html">Valve</a></li><li><a href="cluster-deployer.html">Deployer</a></li><li><a href="cluster-listener.html">ClusterListener</a></li></ul><p><strong>Global Settings</strong></p><ul><li><a href="systemprops.html">System properties</a></li></ul></td><!--RIGHT SIDE MAIN BODY--><td align="left" valign="top" width="80%"><table cellspacing="4" width="100%" border="0"><tr><td valign="top" align="left"><h1>Apache Tomcat Configuration Reference</h1><h2>The ClusterManager object</h2></td><td nowrap="true" valign="top" align="right"><small><a href="printer/cluster-manager.html"><img alt="Printer Friendly Version" border="0" src="../images/printer.gif"><br>print-friendly<br>version |
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| 4 | </a></small></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Introduction"><strong>Introduction</strong></a></font></td></tr><tr><td><blockquote> |
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| 5 | <p> |
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| 6 | A cluster manager is an extension to Tomcat's session manager interface, |
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| 7 | <code>org.apache.catalina.Manager</code> |
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| 8 | A cluster manager must implement the <code>org.apache.catalina.ha.ClusterManager</code> and is solely |
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| 9 | responsible for how the session is replicated.<br> |
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| 10 | There are currently two different managers, the <code>org.apache.catalina.ha.session.DeltaManager</code> replicates deltas |
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| 11 | of session data to all members in the cluster. This implementation is proven and works very well, but has a limitation |
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| 12 | as it requires the cluster members to be homogeneous, all nodes must deploy the same applications and be exact replicas. |
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| 13 | The <code>org.apache.catalina.ha.session.BackupManager</code> also replicates deltas but only to one backup node. |
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| 14 | The location of the backup node is known to all nodes in the cluster. It also supports heterogeneous deployments, |
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| 15 | so the manager knows at what locations the webapp is deployed.<br> |
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| 16 | We are planning to add more managers with even more sophisticated backup mechanism to support even larger clusters. |
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| 17 | Check back soon! |
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| 18 | </p> |
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| 19 | </blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="The <Manager>"><strong>The <Manager></strong></a></font></td></tr><tr><td><blockquote> |
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| 20 | <p> |
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| 21 | The <code><Manager></code> element defined inside the <code><Cluster></code> element |
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| 22 | is the template defined for all web applications that are marked <code><distributable/></code> |
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| 23 | in their <code>web.xml</code> file. |
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| 24 | However, you can still override the manager implementation on a per web application basis, |
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| 25 | by putting the <code><Manager></code> inside the <code><Context></code> element either in the |
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| 26 | <code><a href="context.html">context.xml</a></code> file or the <code><a href="index.html">server.xml</a></code> file. |
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| 27 | </p> |
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| 28 | </blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Attributes"><strong>Attributes</strong></a></font></td></tr><tr><td><blockquote> |
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| 29 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Common Attributes"><strong>Common Attributes</strong></a></font></td></tr><tr><td><blockquote> |
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| 30 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><strong><code>className</code></strong></td><td valign="center" align="left"> |
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| 31 | </td></tr><tr><td valign="center" align="left"><code>name</code></td><td valign="center" align="left"> |
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| 32 | <b>The name of this cluster manager, the name is used to identify a session manager on a node. |
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| 33 | The name might get modified by the <code>Cluster</code> element to make it unique in the container.</b> |
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| 34 | </td></tr><tr><td valign="center" align="left"><code>defaultMode</code></td><td valign="center" align="left"> |
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| 35 | <b>Deprecated since 6.0.0</b> |
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| 36 | </td></tr><tr><td valign="center" align="left"><code>notifyListenersOnReplication</code></td><td valign="center" align="left"> |
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| 37 | Set to <code>true</code> if you wish to have session listeners notified when |
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| 38 | session attributes are being replicated or removed across Tomcat nodes in the cluster. |
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| 39 | </td></tr><tr><td valign="center" align="left"><code>expireSessionsOnShutdown</code></td><td valign="center" align="left"> |
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| 40 | When a webapplication is being shutdown, Tomcat issues an expire call to each session to |
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| 41 | notify all the listeners. If you wish for all sessions to expire on all nodes when |
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| 42 | a shutdown occurs on one node, set this value to <code>true</code>. |
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| 43 | Default value is <code>false</code>. |
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| 44 | </td></tr></table> |
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| 45 | </blockquote></td></tr></table> |
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| 46 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="org.apache.catalina.ha.session.DeltaManager Attributes"><strong>org.apache.catalina.ha.session.DeltaManager Attributes</strong></a></font></td></tr><tr><td><blockquote> |
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| 47 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><code>domainReplication</code></td><td valign="center" align="left"> |
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| 48 | Set to true if you wish sessions to be replicated only to members that have the same logical |
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| 49 | domain set. If set to false, session replication will ignore the domain setting the |
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| 50 | <code><a href="cluster-membership.html"><Membership></a></code> |
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| 51 | element. |
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| 52 | </td></tr><tr><td valign="center" align="left"><code>expireSessionsOnShutdown</code></td><td valign="center" align="left"> |
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| 53 | When a webapplication is being shutdown, Tomcat issues an expire call to each session to |
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| 54 | notify all the listeners. If you wish for all sessions to expire on all nodes when |
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| 55 | a shutdown occurs on one node, set this value to <code>true</code>. |
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| 56 | Default value is <code>false</code>. |
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| 57 | </td></tr><tr><td valign="center" align="left"><code>stateTransferTimeout</code></td><td valign="center" align="left"> |
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| 58 | The time in seconds to wait for a session state transfer to complete from another node |
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| 59 | when a node is starting up. |
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| 60 | Default value is <code>60</code> seconds. |
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| 61 | </td></tr></table> |
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| 62 | </blockquote></td></tr></table> |
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| 63 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="org.apache.catalina.ha.session.BackupManager Attributes"><strong>org.apache.catalina.ha.session.BackupManager Attributes</strong></a></font></td></tr><tr><td><blockquote> |
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| 64 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><code>mapSendOptions</code></td><td valign="center" align="left"> |
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| 65 | The backup manager uses a replicated map, this map is sending and receiving messages. |
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| 66 | You can setup the flag for how this map is sending messages, the default value is <code>6</code>(asynchronous). |
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| 67 | </td></tr></table> |
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| 68 | </blockquote></td></tr></table> |
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| 69 | </blockquote></td></tr></table></td></tr><!--FOOTER SEPARATOR--><tr><td colspan="2"><hr size="1" noshade></td></tr><!--PAGE FOOTER--><tr><td colspan="2"><div align="center"><font size="-1" color="#525D76"><em> |
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| 70 | Copyright © 1999-2008, Apache Software Foundation |
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| 71 | </em></font></div></td></tr></table></body></html> |
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