66 lines
8.1 KiB
HTML
66 lines
8.1 KiB
HTML
|
<html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat Configuration Reference - The ClusterManager object</title><meta name="author" value="Filip Hanik"><meta name="email" value="fhanik@apache.org"></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 6.0</h1></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="noshade" size="1"></td></tr><tr><!--RIGHT SIDE MAIN BODY--><td width="80%" valign="top" align="left"><table border="0" width="100%" cellspacing="4"><tr><td align="left" valign="top"><h1>Apache Tomcat Configuration Reference</h1><h2>The ClusterManager object</h2></td><td align="right" valign="top" nowrap="true"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></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 webapp is deployed.<br>
|
||
|
|
We are planning to add more managers with even more sophisticated backup mechanism to support even larger clusters.
|
||
|
|
Check back soon!
|
||
|
|
</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>"><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"><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>defaultMode</code></td><td align="left" valign="center">
|
||
|
|
<b>Deprecated since 6.0.0</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 webapplication 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"><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>domainReplication</code></td><td align="left" valign="center">
|
||
|
|
Set to true if you wish sessions to be replicated only to members that have the same logical
|
||
|
|
domain set. If set to false, session replication will ignore the domain setting the
|
||
|
|
<code><a href="cluster-membership.html"><Membership></a></code>
|
||
|
|
element.
|
||
|
|
</td></tr><tr><td align="left" valign="center"><code>expireSessionsOnShutdown</code></td><td align="left" valign="center">
|
||
|
|
When a webapplication 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.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>8</code>(asynchronous).
|
||
|
|
</td></tr></table>
|
||
|
|
</blockquote></td></tr></table>
|
||
|
|
</blockquote></td></tr></table></td></tr><!--FOOTER SEPARATOR--><tr><td colspan="2"><hr noshade="noshade" size="1"></td></tr><!--PAGE FOOTER--><tr><td colspan="2"><div align="center"><font color="#525D76" size="-1"><em>
|
||
|
|
Copyright © 1999-2006, Apache Software Foundation
|
||
|
|
</em></font></div></td></tr></table></body></html>
|