| [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><!--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"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../../images/void.gif"></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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| 4 | <p> |
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| 5 | A cluster manager is an extension to Tomcat's session manager interface, |
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| 6 | <code>org.apache.catalina.Manager</code> |
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| 7 | A cluster manager must implement the <code>org.apache.catalina.ha.ClusterManager</code> and is solely |
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| 8 | responsible for how the session is replicated.<br> |
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| 9 | There are currently two different managers, the <code>org.apache.catalina.ha.session.DeltaManager</code> replicates deltas |
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| 10 | 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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| 11 | as it requires the cluster members to be homogeneous, all nodes must deploy the same applications and be exact replicas. |
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| 12 | The <code>org.apache.catalina.ha.session.BackupManager</code> also replicates deltas but only to one backup node. |
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| 13 | The location of the backup node is known to all nodes in the cluster. It also supports heterogeneous deployments, |
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| 14 | so the manager knows at what locations the webapp is deployed.<br> |
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| 15 | We are planning to add more managers with even more sophisticated backup mechanism to support even larger clusters. |
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| 16 | Check back soon! |
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| 17 | </p> |
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| 18 | </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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| 19 | <p> |
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| 20 | The <code><Manager></code> element defined inside the <code><Cluster></code> element |
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| 21 | is the template defined for all web applications that are marked <code><distributable/></code> |
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| 22 | in their <code>web.xml</code> file. |
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| 23 | However, you can still override the manager implementation on a per web application basis, |
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| 24 | by putting the <code><Manager></code> inside the <code><Context></code> element either in the |
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| 25 | <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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| 26 | </p> |
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| 27 | </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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| 28 | <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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| 29 | <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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| 30 | </td></tr><tr><td valign="center" align="left"><code>name</code></td><td valign="center" align="left"> |
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| 31 | <b>The name of this cluster manager, the name is used to identify a session manager on a node. |
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| 32 | The name might get modified by the <code>Cluster</code> element to make it unique in the container.</b> |
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| 33 | </td></tr><tr><td valign="center" align="left"><code>defaultMode</code></td><td valign="center" align="left"> |
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| 34 | <b>Deprecated since 6.0.0</b> |
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| 35 | </td></tr><tr><td valign="center" align="left"><code>notifyListenersOnReplication</code></td><td valign="center" align="left"> |
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| 36 | Set to <code>true</code> if you wish to have session listeners notified when |
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| 37 | session attributes are being replicated or removed across Tomcat nodes in the cluster. |
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| 38 | </td></tr><tr><td valign="center" align="left"><code>expireSessionsOnShutdown</code></td><td valign="center" align="left"> |
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| 39 | When a webapplication is being shutdown, Tomcat issues an expire call to each session to |
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| 40 | notify all the listeners. If you wish for all sessions to expire on all nodes when |
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| 41 | a shutdown occurs on one node, set this value to <code>true</code>. |
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| 42 | Default value is <code>false</code>. |
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| 43 | </td></tr></table> |
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| 44 | </blockquote></td></tr></table> |
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| 45 | <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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| 46 | <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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| 47 | Set to true if you wish sessions to be replicated only to members that have the same logical |
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| 48 | domain set. If set to false, session replication will ignore the domain setting the |
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| 49 | <code><a href="cluster-membership.html"><Membership></a></code> |
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| 50 | element. |
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| 51 | </td></tr><tr><td valign="center" align="left"><code>expireSessionsOnShutdown</code></td><td valign="center" align="left"> |
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| 52 | When a webapplication is being shutdown, Tomcat issues an expire call to each session to |
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| 53 | notify all the listeners. If you wish for all sessions to expire on all nodes when |
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| 54 | a shutdown occurs on one node, set this value to <code>true</code>. |
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| 55 | Default value is <code>false</code>. |
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| 56 | </td></tr><tr><td valign="center" align="left"><code>stateTransferTimeout</code></td><td valign="center" align="left"> |
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| 57 | The time in seconds to wait for a session state transfer to complete from another node |
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| 58 | when a node is starting up. |
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| 59 | Default value is <code>60</code> seconds. |
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| 60 | </td></tr></table> |
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| 61 | </blockquote></td></tr></table> |
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| 62 | <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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| 63 | <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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| 64 | The backup manager uses a replicated map, this map is sending and receiving messages. |
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| 65 | You can setup the flag for how this map is sending messages, the default value is <code>6</code>(asynchronous). |
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| 66 | </td></tr></table> |
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| 67 | </blockquote></td></tr></table> |
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| 68 | </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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| 69 | Copyright © 1999-2008, Apache Software Foundation |
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| 70 | </em></font></div></td></tr></table></body></html> |
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