blob: c30c6fdd356009f77a5062b5416fa5616ca18c56 [file] [log] [blame]
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<html>
<head>
<link href="http://activemq.apache.org/styles/site.css" rel="stylesheet" type="text/css"/>
<link href="http://activemq.apache.org/styles/type-settings.css" rel="stylesheet" type="text/css"/>
<script src="http://activemq.apache.org/styles/prototype.js" type="text/javascript"></script>
<script src="http://activemq.apache.org/styles/rico.js" type="text/javascript"></script>
<script src="http://activemq.apache.org/styles/site.js" type="text/javascript"></script>
<style type="text/css">
.maincontent { overflow:hidden; }
</style>
<!--[if IE]>
<style type="text/css">
.maincontent { width:100%; }
</style>
<![endif]-->
<link href='http://activemq.apache.org/styles/highlighter/styles/shCore.css' rel='stylesheet' type='text/css' />
<link href='http://activemq.apache.org/styles/highlighter/styles/shThemeEclipse.css' rel='stylesheet' type='text/css' />
<script src='http://activemq.apache.org/styles/highlighter/scripts/shCore.js' type='text/javascript'></script>
<script src='http://activemq.apache.org/styles/highlighter/scripts/shBrushJava.js' type='text/javascript'></script>
<script type="text/javascript">
SyntaxHighlighter.defaults['toolbar'] = false;
SyntaxHighlighter.all();
</script>
<title>
Apache ActiveMQ &#8482; -- How do I change dispatch policy
</title>
</head>
<body>
<div class="white_box">
<div class="header">
<div class="header_l">
<div class="header_r">
</div>
</div>
</div>
<div class="content">
<div class="content_l">
<div class="content_r">
<div>
<!-- Banner -->
<div id="asf_logo">
<div id="activemq_logo">
<a shape="rect" style="float:left; width:280px;display:block;text-indent:-5000px;text-decoration:none;line-height:60px; margin-top:10px; margin-left:100px;" href="http://activemq.apache.org" title="The most popular and powerful open source Message Broker">ActiveMQ</a>
<a shape="rect" style="float:right; width:210px;display:block;text-indent:-5000px;text-decoration:none;line-height:60px; margin-top:15px; margin-right:10px;" href="http://www.apache.org" title="The Apache Software Foundation">ASF</a>
</div>
</div>
<div class="top_red_bar">
<div id="site-breadcrumbs">
<a href="community.html">Community</a>&nbsp;&gt;&nbsp;<a href="faq.html">FAQ</a>&nbsp;&gt;&nbsp;<a href="using-apache-activemq.html">Using Apache ActiveMQ</a>&nbsp;&gt;&nbsp;<a href="how-do-i-change-dispatch-policy.html">How do I change dispatch policy</a>
</div>
<div id="site-quicklinks">
<p><a shape="rect" href="download.html">Download</a> | <a shape="rect" class="external-link" href="http://activemq.apache.org/maven/apidocs/index.html">JavaDocs</a> <a shape="rect" href="javadocs.html">More...</a> | <a shape="rect" href="source.html">Source</a> | <a shape="rect" href="discussion-forums.html">Forums</a> | <a shape="rect" href="support.html">Support</a></p>
</div>
</div>
<table border="0">
<tbody>
<tr>
<td valign="top" width="100%">
<div class="wiki-content maincontent"><p>This is much simpler and more powerful in ActiveMQ 4.0 - you can configure different <a shape="rect" href="dispatch-policies.html">Dispatch Policies</a> directly. </p>
<p>For now in ActiveMQ 3.x we have a <a shape="rect" href="what-is-the-prefetch-limit-for.html">PrefetchPolicy configuration</a>. This allows a certain number of messages to be dispatched to a consumer before they are acknowledged. This feature is to achieve high performance; the higher the value the less likely it is that a client has to wait for messages to arrive before processing the message and so the higher the throughput.</p>
<p>e.g. under heavy load of a busy system you probably want to dispatch 1000 or so messages to a consumer, so as soon as its ready to receive a message, there are a bunch of them in memory waiting to be used - rather than having a slow request-response RPC each time.</p>
<p>However the effect of this is that when you send a small number of messages, they tend to all go to one consumer unless you've lots of messages. Note that this issue can be avoided in 4.x as there is now a configurable DispatchPolicy so that you can enforce, say, round robin dispatch policy to ensure that messages are dispatched fairly to avoid this issue. </p>
<p>In ActiveMQ 3.x or later a work around for this issue is to reconfigure the PrefetchPolicy on the ConnectionFactory/Connection so that the broker only prefetches a single message per consumer; though this will greatly reduce the performance and throughput of the system.</p>
<h3 id="HowdoIchangedispatchpolicy-ConfiguringthedispatchpolicyinActiveMQ4.x">Configuring the dispatch policy in ActiveMQ 4.x</h3>
<p>In AMQ 4.x, the dispatch policy can now be configured on the xml configuration file (ie. activemq.xml)<br clear="none">
ie.</p>
<div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
<pre class="brush: java; gutter: false; theme: Default" style="font-size:12px;">
&lt;destinationPolicy&gt;
&lt;policyMap&gt;&lt;policyEntries&gt;
&lt;policyEntry topic="COMMAND.&gt;"&gt;
&lt;dispatchPolicy&gt;
&lt;strictOrderDispatchPolicy /&gt;
&lt;/dispatchPolicy&gt;
&lt;subscriptionRecoveryPolicy&gt;
&lt;noSubscriptionRecoveryPolicy /&gt;
&lt;/subscriptionRecoveryPolicy&gt;
&lt;/policyEntry&gt;
&lt;/policyEntries&gt;&lt;/policyMap&gt;
&lt;/destinationPolicy&gt;
</pre>
</div></div></div>
</td>
<td valign="top">
<div class="navigation">
<div class="navigation_top">
<div class="navigation_bottom">
<h3 id="Navigation-Overviewhttps://cwiki.apache.org/confluence/pages/viewpage.action?pageId=35985"><a shape="rect" href="overview.html">Overview</a></h3><ul class="alternate"><li><a shape="rect" href="index.html">Index</a></li><li><a shape="rect" href="news.html">News</a></li><li><a shape="rect" href="new-features.html">New Features</a></li><li><a shape="rect" href="getting-started.html">Getting Started</a></li><li><a shape="rect" href="faq.html">FAQ</a></li><li><a shape="rect" href="articles.html">Articles</a></li><li><a shape="rect" href="books.html">Books</a></li><li><a shape="rect" href="download.html">Download</a></li><li><a shape="rect" class="external-link" href="http://www.apache.org/licenses/">License</a></li></ul><h3 id="Navigation-Search">Search</h3><div>
<form enctype="application/x-www-form-urlencoded" method="get" action="http://www.google.com/search" style="font-size: 10px;">
<input type="hidden" name="ie" value="UTF-8">
<input type="hidden" name="oe" value="UTF-8">
<input maxlength="255" type="text" name="q" size="15" value="value"><br clear="none">
<input type="submit" name="btnG" value="Search">
<input type="hidden" name="domains" value="activemq.apache.org">
<input type="hidden" name="sitesearch" value="activemq.apache.org">
</form>
</div>
<h3 id="Navigation-SubProjects">Sub Projects</h3><ul class="alternate"><li><a shape="rect" class="external-link" href="http://activemq.apache.org/artemis/">Artemis</a></li><li><a shape="rect" class="external-link" href="http://activemq.apache.org/apollo" title="ActiveMQ Apollo">Apollo</a></li><li><a shape="rect" class="external-link" href="http://activemq.apache.org/cms/">CMS</a></li><li><a shape="rect" class="external-link" href="http://activemq.apache.org/nms/" title="NMS is the .Net Messaging API">NMS</a></li></ul><h3 id="Navigation-Communityhttps://cwiki.apache.org/confluence/pages/viewpage.action?pageId=36130"><a shape="rect" href="community.html">Community</a></h3><ul class="alternate"><li><a shape="rect" href="support.html">Support</a></li><li><a shape="rect" href="contributing.html">Contributing</a></li><li><a shape="rect" href="discussion-forums.html">Discussion Forums</a></li><li><a shape="rect" href="mailing-lists.html">Mailing Lists</a></li><li><a shape="rect" href="irc.html">IRC</a></li><li><a shape="rect" class="external-link" href="http://javabot.evanchooly.com/logs/%23apache-activemq/today" rel="nofollow">IRC Log</a></li><li><a shape="rect" href="security-advisories.html">Security Advisories</a></li><li><a shape="rect" href="site.html">Site</a></li><li><a shape="rect" class="external-link" href="http://www.apache.org/foundation/sponsorship.html">Sponsorship</a></li><li><a shape="rect" href="projects-using-activemq.html">Projects Using ActiveMQ</a></li><li><a shape="rect" href="users.html">Users</a></li><li><a shape="rect" href="team.html">Team</a></li><li><a shape="rect" href="thanks.html">Thanks</a></li></ul><h3 id="Navigation-Featureshttps://cwiki.apache.org/confluence/pages/viewpage.action?pageId=35883"><a shape="rect" href="features.html">Features</a></h3><ul class="alternate"><li><a shape="rect" href="advisory-message.html">Advisory Message</a></li><li><a shape="rect" href="clustering.html">Clustering</a></li><li><a shape="rect" href="cross-language-clients.html">Cross Language Clients</a></li><li><a shape="rect" href="enterprise-integration-patterns.html">Enterprise Integration Patterns</a></li><li><a shape="rect" href="jmx.html">JMX</a></li><li><a shape="rect" href="jms-to-jms-bridge.html">JMS to JMS Bridge</a></li><li><a shape="rect" href="masterslave.html">MasterSlave</a></li><li><a shape="rect" href="message-groups.html">Message Groups</a></li><li><a shape="rect" href="networks-of-brokers.html">Networks of Brokers</a></li><li><a shape="rect" href="performance.html">Performance</a></li><li><a shape="rect" href="persistence.html">Persistence</a></li><li><a shape="rect" href="security.html">Security</a></li><li><a shape="rect" href="virtual-destinations.html">Virtual Destinations</a></li><li><a shape="rect" href="visualisation.html">Visualisation</a></li><li><a shape="rect" href="features.html">More ...</a></li></ul><h3 id="Navigation-Connectivityhttps://cwiki.apache.org/confluence/pages/viewpage.action?pageId=36167"><a shape="rect" href="connectivity.html">Connectivity</a></h3><ul class="alternate"><li><a shape="rect" href="ajax.html">Ajax</a></li><li><a shape="rect" href="amqp.html">AMQP</a></li><li><a shape="rect" href="axis-and-cxf-support.html">Axis and CXF Support</a></li><li><a shape="rect" href="c-integration.html">C Integration</a></li><li><a shape="rect" href="activemq-c-clients.html">C++</a></li><li><a shape="rect" class="external-link" href="http://activemq.apache.org/nms/">C# and .Net Integration</a></li><li><a shape="rect" class="external-link" href="http://activemq.apache.org/cms/">CMS</a></li><li><a shape="rect" href="j2ee.html">J2EE</a></li><li><a shape="rect" href="jboss-integration.html">JBoss Integration</a></li><li><a shape="rect" class="external-link" href="http://docs.codehaus.org/display/JETTY/Integrating+with+ActiveMQ" rel="nofollow">Jetty</a></li><li><a shape="rect" href="jndi-support.html">JNDI Support</a></li><li><a shape="rect" class="external-link" href="http://activemq.apache.org/nms/" title="NMS is the .Net Messaging API">NMS</a></li><li><a shape="rect" href="rest.html">REST</a></li><li><a shape="rect" href="rss-and-atom.html">RSS and Atom</a></li><li><a shape="rect" href="spring-support.html">Spring Support</a></li><li><a shape="rect" href="stomp.html">Stomp</a></li><li><a shape="rect" href="tomcat.html">Tomcat</a></li><li><a shape="rect" href="unix-service.html">Unix Service</a></li><li><a shape="rect" href="weblogic-integration.html">WebLogic Integration</a></li><li><a shape="rect" href="xmpp.html">XMPP</a></li><li><a shape="rect" href="connectivity.html">More ...</a></li></ul><h3 id="Navigation-UsingActiveMQ5https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=71176"><a shape="rect" href="using-activemq-5.html">Using ActiveMQ 5</a></h3><ul class="alternate"><li><a shape="rect" href="version-5-getting-started.html">Getting Started</a></li><li><a shape="rect" href="version-5-initial-configuration.html">Initial Configuration</a></li><li><a shape="rect" href="version-5-run-broker.html">Running a Broker</a></li><li><a shape="rect" href="how-do-i-embed-a-broker-inside-a-connection.html">Embedded Brokers</a></li><li><a shape="rect" href="activemq-command-line-tools-reference.html">Command Line Tools</a></li><li><a shape="rect" href="configuring-version-5-transports.html">Configuring Transports</a></li><li><a shape="rect" href="version-5-examples.html">Examples</a></li><li><a shape="rect" href="version-5-web-samples.html">Web Samples</a></li><li><a shape="rect" href="how-can-i-monitor-activemq.html">Monitoring the Broker</a></li><li><a shape="rect" href="version-5-xml-configuration.html">Xml Configuration</a></li><li><a shape="rect" href="xml-reference.html">Xml Reference</a></li><li><a shape="rect" href="using-activemq-5.html">More ...</a></li></ul><h3 id="Navigation-Toolshttps://cwiki.apache.org/confluence/pages/viewpage.action?pageId=35912"><a shape="rect" href="tools.html">Tools</a></h3><ul class="alternate"><li><a shape="rect" href="web-console.html">Web Console</a></li><li><a shape="rect" href="activemq-performance-module-users-manual.html">Maven2 Performance Plugin</a></li></ul><h3 id="Navigation-Supporthttps://cwiki.apache.org/confluence/pages/viewpage.action?pageId=35919"><a shape="rect" href="support.html">Support</a></h3><ul class="alternate"><li><a shape="rect" class="external-link" href="http://issues.apache.org/jira/browse/AMQ">Issues</a></li><li><a shape="rect" class="external-link" href="http://issues.apache.org/activemq/browse/AMQ?report=com.atlassian.jira.plugin.system.project:roadmap-panel">Roadmap</a></li><li><a shape="rect" class="external-link" href="http://issues.apache.org/activemq/browse/AMQ?report=com.atlassian.jira.plugin.system.project:changelog-panel">Change log</a></li></ul><h3 id="Navigation-Developershttps://cwiki.apache.org/confluence/pages/viewpage.action?pageId=35903"><a shape="rect" href="developers.html">Developers</a></h3><ul class="alternate"><li><a shape="rect" href="source.html">Source</a></li><li><a shape="rect" href="building.html">Building</a></li><li><a shape="rect" href="developer-guide.html">Developer Guide</a></li><li><a shape="rect" href="becoming-a-committer.html">Becoming a committer</a></li><li><a shape="rect" href="code-overview.html">Code Overview</a></li><li><a shape="rect" href="wire-protocol.html">Wire Protocol</a></li><li><a shape="rect" href="release-guide.html">Release Guide</a></li></ul><h3 id="Navigation-Tests">Tests</h3><ul class="alternate"><li><a shape="rect" href="activemq-performance-module-users-manual.html">Maven2 Performance Plugin</a></li><li><a shape="rect" href="benchmark-tests.html">Benchmark Tests</a></li><li><a shape="rect" href="jmeter-system-tests.html">JMeter System Tests</a></li><li><a shape="rect" href="jmeter-performance-tests.html">JMeter Performance Tests</a></li><li><a shape="rect" href="integration-tests.html">Integration Tests</a></li></ul><h3 id="Navigation-ProjectReports">Project Reports</h3><ul class="alternate"><li><a shape="rect" href="junit-reports.html">JUnit Reports</a></li><li><a shape="rect" href="source-xref.html">Source XRef</a></li><li><a shape="rect" href="test-source-xref.html">Test Source XRef</a></li><li><a shape="rect" href="xml-reference.html">Xml Reference</a></li></ul>
</div>
</div>
</div>
</td>
</tr>
</tbody>
</table>
<div class="bottom_red_bar"></div>
</div>
</div>
</div>
</div>
<div class="black_box">
<div class="footer">
<div class="footer_l">
<div class="footer_r">
<div>
<a href="http://activemq.apache.org/privacy-policy.html">Privacy Policy</a> -
(<a href="https://cwiki.apache.org/confluence/pages/editpage.action?pageId=36049">edit this page</a>)
</div>
</div>
</div>
</div>
</div>
</div>
<div class="design_attribution">
&copy; 2004-2011 The Apache Software Foundation.
<br/>
Apache ActiveMQ, ActiveMQ, Apache, the Apache feather logo, and the Apache ActiveMQ project logo are trademarks of The Apache Software Foundation. All other marks mentioned may be trademarks or registered trademarks of their respective owners.
<br/>
<a href="http://hiramchirino.com">Graphic Design By Hiram</a>
</div>
<!-- delay the loading of large javascript files to the end so that they don't interfere with the loading of page content -->
<span style="display: none">
<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>
<script type="text/javascript">
var pageTracker = _gat._getTracker("UA-1347593-1");
pageTracker._initData();
pageTracker._trackPageview();
</script>
</span>
</body>
</html>