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From build...@apache.org
Subject svn commit: r1020102 - in /websites/production/activemq/content: cache/main.pageCache message-groups.html
Date Fri, 27 Oct 2017 10:24:03 GMT
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
==============================================================================
Binary files - no diff available.

Modified: websites/production/activemq/content/message-groups.html
==============================================================================
--- 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>
+    .jira-issue {
+        padding: 0 0 0 2px;
+        line-height: 20px;
+    }
+
+    .jira-issue img {
+        padding-right: 5px;
+    }
+    .jira-issue .aui-lozenge {
+        line-height: 18px;
+        vertical-align: top;
+    }
+
+    .jira-issue .icon {
+        background-position: left center;
+        background-repeat: no-repeat;
+        display: inline-block;
+        font-size: 0;
+        max-height: 16px;
+        text-align: left;
+        text-indent: -9999em;
+        vertical-align: text-bottom;
+    }
+</style>
+
+    <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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