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<html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat 7 Configuration Reference (7.0.16) - The ClusterManager object</title><meta name="author" content="Filip Hanik"><style type="text/css" media="print"> .noPrint {display: none;} td#mainBody {width: 100%;} </style></head><body bgcolor="#ffffff" text="#000000" link="#525D76" alink="#525D76" vlink="#525D76"><table border="0" width="100%" cellspacing="0"><!--PAGE HEADER--><tr><td><!--PROJECT LOGO--><a href="http://tomcat.apache.org/"><img src="../images/tomcat.gif" align="right" alt=" The Apache Tomcat Servlet/JSP Container " border="0"></a></td><td><font face="arial,helvetica,sanserif"><h1>Apache Tomcat 7</h1> Version 7.0.16, Jun 11 2011</font></td><td><!--APACHE LOGO--><a href="http://www.apache.org/"><img src="../images/asf-logo.gif" align="right" alt="Apache Logo" border="0"></a></td></tr></table><table border="0" width="100%" cellspacing="4"><!--HEADER SEPARATOR--><tr><td colspan="2"><hr noshade size="1"></td></tr><tr><!--LEFT SIDE NAVIGATION--><td width="20%" valign="top" nowrap class="noPrint"><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="filter.html">Filter</a></li><li><a href="globalresources.html">Global Resources</a></li><li><a href="jar-scanner.html">JarScanner</a></li><li><a href="listeners.html">Listeners</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 width="80%" valign="top" align="left" id="mainBody"><h1>The ClusterManager object</h1><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Table of Contents"><!--()--></a><a name="Table_of_Contents"><strong>Table of Contents</strong></a></font></td></tr><tr><td><blockquote> <ul><li><a href="#Introduction">Introduction</a></li><li><a href="#The_<Manager>">The <Manager></a></li><li><a href="#Attributes">Attributes</a><ol><li><a href="#Common_Attributes">Common Attributes</a></li><li><a href="#org.apache.catalina.ha.session.DeltaManager_Attributes">org.apache.catalina.ha.session.DeltaManager Attributes</a></li><li><a href="#org.apache.catalina.ha.session.BackupManager_Attributes">org.apache.catalina.ha.session.BackupManager Attributes</a></li></ol></li></ul> </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Introduction"><strong>Introduction</strong></a></font></td></tr><tr><td><blockquote> <p>A cluster manager is an extension to Tomcat's session manager interface, <code>org.apache.catalina.Manager</code>. A cluster manager must implement the <code>org.apache.catalina.ha.ClusterManager</code> and is solely responsible for how the session is replicated.<br> There are currently two different managers, the <code>org.apache.catalina.ha.session.DeltaManager</code> replicates deltas of session data to all members in the cluster. This implementation is proven and works very well, but has a limitation as it requires the cluster members to be homogeneous, all nodes must deploy the same applications and be exact replicas. The <code>org.apache.catalina.ha.session.BackupManager</code> also replicates deltas but only to one backup node. The location of the backup node is known to all nodes in the cluster. It also supports heterogeneous deployments, so the manager knows at what locations the web application is deployed.</p> </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="The <Manager>"><!--()--></a><a name="The_<Manager>"><strong>The <Manager></strong></a></font></td></tr><tr><td><blockquote> <p>The <code><Manager></code> element defined inside the <code><Cluster></code> element is the template defined for all web applications that are marked <code><distributable/></code> in their <code>web.xml</code> file. However, you can still override the manager implementation on a per web application basis, by putting the <code><Manager></code> inside the <code><Context></code> element either in the <code><a href="context.html">context.xml</a></code> file or the <code><a href="index.html">server.xml</a></code> file.</p> </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Attributes"><strong>Attributes</strong></a></font></td></tr><tr><td><blockquote> <table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Common Attributes"><!--()--></a><a name="Common_Attributes"><strong>Common Attributes</strong></a></font></td></tr><tr><td><blockquote> <table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><strong><code>className</code></strong></td><td align="left" valign="center"> </td></tr><tr><td align="left" valign="center"><code>name</code></td><td align="left" valign="center"> <b>The name of this cluster manager, the name is used to identify a session manager on a node. The name might get modified by the <code>Cluster</code> element to make it unique in the container.</b> </td></tr><tr><td align="left" valign="center"><code>notifyListenersOnReplication</code></td><td align="left" valign="center"> Set to <code>true</code> if you wish to have session listeners notified when session attributes are being replicated or removed across Tomcat nodes in the cluster. </td></tr><tr><td align="left" valign="center"><code>expireSessionsOnShutdown</code></td><td align="left" valign="center"> When a web application is being shutdown, Tomcat issues an expire call to each session to notify all the listeners. If you wish for all sessions to expire on all nodes when a shutdown occurs on one node, set this value to <code>true</code>. Default value is <code>false</code>. </td></tr></table> </blockquote></td></tr></table> <table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="org.apache.catalina.ha.session.DeltaManager Attributes"><!--()--></a><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> <table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code>expireSessionsOnShutdown</code></td><td align="left" valign="center"> When a web application is being shutdown, Tomcat issues an expire call to each session to notify all the listeners. If you wish for all sessions to expire on all nodes when a shutdown occurs on one node, set this value to <code>true</code>. Default value is <code>false</code>. </td></tr><tr><td align="left" valign="center"><code>maxActiveSessions</code></td><td align="left" valign="center"> The maximum number of active sessions that will be created by this Manager, or -1 (the default) for no limit. For this manager, all sessions are counted as active sessions irrespective if whether or not the current node is the primary node for the session. </td></tr><tr><td align="left" valign="center"><code>stateTransferTimeout</code></td><td align="left" valign="center"> The time in seconds to wait for a session state transfer to complete from another node when a node is starting up. Default value is <code>60</code> seconds. </td></tr></table> </blockquote></td></tr></table> <table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="org.apache.catalina.ha.session.BackupManager Attributes"><!--()--></a><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> <table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code>mapSendOptions</code></td><td align="left" valign="center"> The backup manager uses a replicated map, this map is sending and receiving messages. You can setup the flag for how this map is sending messages, the default value is <code>6</code>(synchronous).<br> Note that if you use asynchronous messaging it is possible for update messages for a session to be processed by the receiving node in a different order to the order in which they were sent. </td></tr><tr><td align="left" valign="center"><code>maxActiveSessions</code></td><td align="left" valign="center"> The maximum number of active sessions that will be created by this Manager, or -1 (the default) for no limit. For this manager, only sessions where the current node is the primary node for the session are considered active sessions. </td></tr></table> </blockquote></td></tr></table> </blockquote></td></tr></table></td></tr><!--FOOTER SEPARATOR--><tr><td colspan="2"><hr noshade size="1"></td></tr><!--PAGE FOOTER--><tr><td colspan="2"><div align="center"><font color="#525D76" size="-1"><em> Copyright © 1999-2011, Apache Software Foundation </em></font></div></td></tr></table></body></html>

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