svn commit: r1020102 - in /websites/production/activemq/content: cache/main.pageCache message-groups.html

[bu...@apache.org]

Author: buildbot
Date: Fri Oct 27 10:24:03 2017
New Revision: 1020102

Log:
Production update by buildbot for activemq

Modified:
    websites/production/activemq/content/cache/main.pageCache
    websites/production/activemq/content/message-groups.html

Modified: websites/production/activemq/content/cache/main.pageCache
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Binary files - no diff available.

Modified: websites/production/activemq/content/message-groups.html
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--- websites/production/activemq/content/message-groups.html (original)
+++ websites/production/activemq/content/message-groups.html Fri Oct 27 10:24:03 2017
@@ -37,6 +37,7 @@
       <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 src='http://activemq.apache.org/styles/highlighter/scripts/shBrushXml.js' type='text/javascript'></script> 
+              <script src='http://activemq.apache.org/styles/highlighter/scripts/shBrushBash.js' type='text/javascript'></script> 
          
       <script type="text/javascript"> 
         SyntaxHighlighter.defaults['toolbar'] = false; 
@@ -127,7 +128,34 @@ if (message.getBooleanProperty("JMSXGrou
   &lt;/policyMap&gt;
 &lt;/destinationPolicy&gt;
 </pre>
-</div></div><p>As <a shape="rect" class="external-link" href="https://github.com/apache/activemq/blob/master/activemq-unit-tests/src/test/java/org/apache/activemq/usecases/MessageGroupDelayedTest.java" rel="nofollow">the appropriate test case</a> shows, adding a small time pause before dispatching or setting a minimum consumer number, ensures equal message group distribution.</p><div class="confluence-information-macro confluence-information-macro-note"><p class="title">Availability</p><span class="aui-icon aui-icon-small aui-iconfont-warning confluence-information-macro-icon"></span><div class="confluence-information-macro-body"><p>Available since version 5.3</p></div></div><h3 id="MessageGroups-See">See</h3><ul><li><a shape="rect" href="how-do-message-groups-compare-to-selectors.html">How do Message Groups compare to Selectors</a></li></ul></div>
+</div></div><p>As <a shape="rect" class="external-link" href="https://github.com/apache/activemq/blob/master/activemq-unit-tests/src/test/java/org/apache/activemq/usecases/MessageGroupDelayedTest.java" rel="nofollow">the appropriate test case</a> shows, adding a small time pause before dispatching or setting a minimum consumer number, ensures equal message group distribution.</p><p>&#160;</p><h3 id="MessageGroups-Competingdemandsofmemoryconsumption,loadbalancing,complexity,etc."><span style="color: rgb(33,33,33);">Competing demands of memory consumption, load balancing, complexity, etc.</span></h3><p>The default behavior which is limited to 1024 message groups in an LRU cache may not match you expectation w.r.t message order... some detail to explain:</p><p>MessageGroupHashBucket and SimpleMessageGroupMap message groups work by associating each group with a consumer.</p><p>SimpleMessageGroupMap keeps track of every group but suffers from unbounded memory use.</p><p>MessageGroupHashB
 ucked keeps track of every group and has bounded memory use.</p><p>CachedMessageGroupMap has bounded memory use, but only keeps track of up to 1024 (or the maximum configured size) groups, then loses track of any groups older than the newest 1024.</p><p>In this way, if there are more groups than the maximum, <strong>ordering will be lost for the oldest groups</strong>.</p><p>Typically users would close groups such that the in memory set can be retained below the configured limits. Some usefull discussion at&#160;[<style>
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+
+    <span class="jira-issue AMQ-6851"><a shape="rect" class="issue-link" href="https://issues.apache.org/jira/browse/AMQ-6851?src=confmacro">AMQ-6851</a></span>
+]</p><h3 id="MessageGroups-See">See</h3><ul><li><a shape="rect" href="how-do-message-groups-compare-to-selectors.html">How do Message Groups compare to Selectors</a></li></ul></div>
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