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61 lines
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<html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat Configuration Reference - The Cluster Channel 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="
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The Apache Tomcat Servlet/JSP Container
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" 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><!--LEFT SIDE NAVIGATION--><td width="20%" valign="top" nowrap="true"><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></td><!--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 Cluster Channel object</h2></td><td align="right" valign="top" nowrap="true"><small><a href="printer/cluster-channel.html"><img src="../images/printer.gif" border="0" alt="Printer Friendly Version"><br>print-friendly<br>version
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</a></small></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>
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The cluster channel is the main component of a small framework we've nicknamed Apache Tribes.<br>
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The channel manages a set of sub components and together they create a group communication framework.<br>
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This framework is then used internally by the components that need to send messages between different Tomcat instances.
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<br>
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A few examples of these components would be the SimpleTcpCluster that does the messaging for the DeltaManager,
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or the BackupManager that uses a different replication strategy. The ReplicatedContext object does also
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use the channel object to communicate context attribute changes.
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</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Nested Components"><strong>Nested Components</strong></a></font></td></tr><tr><td><blockquote>
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<p><b><a href="cluster-membership.html">Channel/Membership</a>:</b> <br>
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The Membership component is responsible for auto discovering new nodes in the cluster
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and also to provide for notifications for any nodes that have not responded with a heartbeat.
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The default implementation uses multicast.<br>
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In the membership component you configure how your nodes, aka. members, are to be discovered and/or
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divided up.
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You can always find out more about <a href="../tribes/introduction.html">Apache Tribes</a>
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</p>
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<p><b><a href="cluster-sender.html">Channel/Sender</a>:</b> <br>
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The Sender component manages all outbound connections and data messages that are sent
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over the network from one node to another.
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This component allows messages to be sent in parallel.
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The default implementation uses TCP client sockets, and socket tuning for outgoing messages are
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configured here.<br>
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You can always find out more about <a href="../tribes/introduction.html">Apache Tribes</a>
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</p>
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<p><b><a href="cluster-sender.html#transport">Channel/Sender/Transport</a>:</b> <br>
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The Transport component is the bottom IO layer for the sender component.
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The default implementation uses non-blocking TCP client sockets.<br>
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You can always find out more about <a href="../tribes/introduction.html">Apache Tribes</a>
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</p>
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<p><b><a href="cluster-receiver.html">Channel/Receiver</a>:</b> <br>
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The receiver component listens for messages from other nodes.
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Here you will configure the cluster thread pool, as it will dispatch incoming
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messages to a thread pool for faster processing.
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The default implementation uses non-blocking TCP server sockets.<br>
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You can always find out more about <a href="../tribes/introduction.html">Apache Tribes</a>
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</p>
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<p><b><a href="cluster-interceptor.html">Channel/Interceptor</a>:</b> <br>
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The channel will send messages through an interceptor stack. Because of this, you have the ability to
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customize the way messages are sent and received, and even how membership is handled.<br>
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You can always find out more about <a href="../tribes/introduction.html">Apache Tribes</a>
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</p>
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</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>
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<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>
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<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">
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The default value here is <code>org.apache.catalina.tribes.group.GroupChannel</code> and is
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currently the only implementation available.
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</td></tr></table>
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</blockquote></td></tr></table>
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</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>
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Copyright © 1999-2006, Apache Software Foundation
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</em></font></div></td></tr></table></body></html>
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