| 1 | <html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat Configuration Reference - The Cluster Valve 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 Cluster Valve 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 valve is no different from any other <a href="valve.html">Tomcat <code>Valve</code></a>. |
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| 6 | The cluster valves are interceptors in the invokation chain for HTTP requests, and the clustering implementation |
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| 7 | uses these valves to make intelligent decision around data and when data should be replicated. |
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| 8 | </p> |
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| 9 | <p> |
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| 10 | A cluster valve must implement the <code>org.apache.catalina.ha.ClusterValve</code> interface. |
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| 11 | This is a simple interface that extends the <code>org.apache.catalina.Valve</code> interface. |
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| 12 | </p> |
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| 13 | </blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="org.apache.catalina.ha.tcp.ReplicationValve"><strong>org.apache.catalina.ha.tcp.ReplicationValve</strong></a></font></td></tr><tr><td><blockquote> |
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| 14 | The <code>ReplicationValve</code> will notify the cluster at the end of a HTTP request |
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| 15 | so that the cluster can make a decision whether there is data to be replicated or not. |
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| 16 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Attributes"><strong>Attributes</strong></a></font></td></tr><tr><td><blockquote> |
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| 17 | <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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| 18 | Set value to <code>org.apache.catalina.ha.tcp.ReplicationValve</code> |
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| 19 | </td></tr><tr><td valign="center" align="left"><code>filter</code></td><td valign="center" align="left"> |
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| 20 | For known file extensions or urls, you can use a filter to |
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| 21 | notify the cluster that the session has not been modified during this |
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| 22 | request and the cluster doesn't have to probe the session managers for changes. |
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| 23 | If there is a filter match, the cluster assumes there has been no session change. |
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| 24 | An example filter would look like <code>filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;"</code> |
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| 25 | The filter uses regular expressions and each filter is delimited by a semi colon. |
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| 26 | <code>Pattern#compile(java.lang.String)</code> |
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| 27 | </td></tr><tr><td valign="center" align="left"><code>primaryIndicator</code></td><td valign="center" align="left"> |
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| 28 | Boolean value, so to true, and the replication valve will insert a request attribute with the name |
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| 29 | defined by the <code>primaryIndicatorName</code> attribute. |
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| 30 | The value inserted into the request attribute is either <code>Boolean.TRUE</code> or |
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| 31 | <code>Boolean.FALSE</code> |
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| 32 | </td></tr><tr><td valign="center" align="left"><code>primaryIndicatorName</code></td><td valign="center" align="left"> |
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| 33 | Default value is <code>org.apache.catalina.ha.tcp.isPrimarySession</code> |
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| 34 | The value defined here is the name of the request attribute that contains the boolean value |
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| 35 | if the session is primary on this server or not. |
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| 36 | </td></tr><tr><td valign="center" align="left"><code>statistics</code></td><td valign="center" align="left"> |
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| 37 | Boolean value. Set to <code>true</code> if you want the valve to collect request statistics. |
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| 38 | Default value is <code>false</code> |
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| 39 | </td></tr></table> |
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| 40 | </blockquote></td></tr></table> |
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| 41 | </blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="org.apache.catalina.ha.session.JvmRouteBinderValve"><strong>org.apache.catalina.ha.session.JvmRouteBinderValve</strong></a></font></td></tr><tr><td><blockquote> |
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| 42 | In case of a mod_jk failover, the <code>JvmRouteBinderValve</code> will replace the |
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| 43 | <code>jvmWorker</code> attribute in the session Id, to make future requests stick to this |
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| 44 | node. If you want failback capability, don't enable this valve, but if you want your failover to stick, |
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| 45 | and for mod_jk not to have to keep probing the node that went down, you use this valve. |
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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="Attributes"><strong>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"><strong><code>className</code></strong></td><td valign="center" align="left"> |
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| 48 | <code>org.apache.catalina.ha.session.JvmRouteBinderValve</code> |
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| 49 | </td></tr><tr><td valign="center" align="left"><code>enabled</code></td><td valign="center" align="left"> |
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| 50 | Default value is <code>true</code> |
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| 51 | Runtime attribute to turn on and off turn over of the session's jvmRoute value. |
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| 52 | </td></tr></table> |
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| 53 | </blockquote></td></tr></table> |
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| 54 | </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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| 55 | Copyright © 1999-2008, Apache Software Foundation |
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| 56 | </em></font></div></td></tr></table></body></html> |
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