| <html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat Configuration Reference (6.0.39) - The Cluster Channel object</title><meta name="author" content="Filip Hanik"><style type="text/css" media="print"> | |
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| " border="0"></a></td><td><h1><font face="arial,helvetica,sanserif">Apache Tomcat 6.0</font></h1><font face="arial,helvetica,sanserif">Version 6.0.39, Jan 27 2014</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="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="globalresources.html">Global Resources</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>Other</strong></p><ul><li><a href="filter.html">Filter</a></li><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>Apache Tomcat Configuration Reference</h1><h2>The Cluster Channel object</h2><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="#Nested_Components">Nested Components</a></li><li><a href="#Attributes">Attributes</a><ol><li><a href="#Common_Attributes">Common 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> | |
| The cluster channel is the main component of a small framework we've nicknamed Apache Tribes.<br> | |
| The channel manages a set of sub components and together they create a group communication framework.<br> | |
| This framework is then used internally by the components that need to send messages between different Tomcat instances. | |
| <br> | |
| A few examples of these components would be the SimpleTcpCluster that does the messaging for the DeltaManager, | |
| or the BackupManager that uses a different replication strategy. The ReplicatedContext object does also | |
| use the channel object to communicate context attribute changes. | |
| </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"><!--()--></a><a name="Nested_Components"><strong>Nested Components</strong></a></font></td></tr><tr><td><blockquote> | |
| <p><b><a href="cluster-membership.html">Channel/Membership</a>:</b> <br> | |
| The Membership component is responsible for auto discovering new nodes in the cluster | |
| and also to provide for notifications for any nodes that have not responded with a heartbeat. | |
| The default implementation uses multicast.<br> | |
| In the membership component you configure how your nodes, aka. members, are to be discovered and/or | |
| divided up. | |
| You can always find out more about <a href="../tribes/introduction.html">Apache Tribes</a> | |
| </p> | |
| <p><b><a href="cluster-sender.html">Channel/Sender</a>:</b> <br> | |
| The Sender component manages all outbound connections and data messages that are sent | |
| over the network from one node to another. | |
| This component allows messages to be sent in parallel. | |
| The default implementation uses TCP client sockets, and socket tuning for outgoing messages are | |
| configured here.<br> | |
| You can always find out more about <a href="../tribes/introduction.html">Apache Tribes</a> | |
| </p> | |
| <p><b><a href="cluster-sender.html#transport">Channel/Sender/Transport</a>:</b> <br> | |
| The Transport component is the bottom IO layer for the sender component. | |
| The default implementation uses non-blocking TCP client sockets.<br> | |
| You can always find out more about <a href="../tribes/introduction.html">Apache Tribes</a> | |
| </p> | |
| <p><b><a href="cluster-receiver.html">Channel/Receiver</a>:</b> <br> | |
| The receiver component listens for messages from other nodes. | |
| Here you will configure the cluster thread pool, as it will dispatch incoming | |
| messages to a thread pool for faster processing. | |
| The default implementation uses non-blocking TCP server sockets.<br> | |
| You can always find out more about <a href="../tribes/introduction.html">Apache Tribes</a> | |
| </p> | |
| <p><b><a href="cluster-interceptor.html">Channel/Interceptor</a>:</b> <br> | |
| The channel will send messages through an interceptor stack. Because of this, you have the ability to | |
| customize the way messages are sent and received, and even how membership is handled.<br> | |
| You can always find out more about <a href="../tribes/introduction.html">Apache Tribes</a> | |
| </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"> | |
| The default value here is <code>org.apache.catalina.tribes.group.GroupChannel</code> and is | |
| currently the only implementation available. | |
| </td></tr></table> | |
| </blockquote></td></tr></table> | |
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