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From jstrac...@apache.org
Subject svn commit: r374430 [29/45] - /incubator/activemq/site/
Date Thu, 02 Feb 2006 16:33:52 GMT
Added: incubator/activemq/site/Message+Groups
URL: http://svn.apache.org/viewcvs/incubator/activemq/site/Message%2BGroups?rev=374430&view=auto
==============================================================================
--- incubator/activemq/site/Message+Groups (added)
+++ incubator/activemq/site/Message+Groups Thu Feb  2 08:31:10 2006
@@ -0,0 +1,247 @@
+
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+            Message Groups 
+                </td>
+                <td align="right">
+            
+                </td>
+              </tr>
+            </table>
+          </div>
+
+
+          <div>
+  <div id="Content">
+    <p>Message Groups rock! <img align="absmiddle" alt="" border=0 class="emoticon" height=20 src="/images/icons/emoticons/smile.gif" width=20> They are an enhancement to the <a href="Exclusive+Consumer" title="Exclusive Consumer">Exclusive Consumer</a> feature to provide</p>
+    <ul>
+      <li>guarranteed ordering of the processing of related messages across a single queue</li>
+      <li>load balancing of the processing of messages across multiple consumers</li>
+      <li>high availability / auto-failover to other consumers if a JVM goes down</li>
+    </ul>
+    <p>So logically Message Groups are kinda like a parallel <a href="Exclusive+Consumer" title="Exclusive Consumer">Exclusive Consumer</a>. Rather than all messages going to a single consumer, the standard JMS header <b>JMSXGroupID</b> is used to define which <em>message group</em> the message belongs to. The Message Group feature then ensures that all messages for the same message group will be sent to the same JMS consumer - while that consumer stays alive. As soon as the consumer dies another will be chosen.</p>
+    <p>Another way of explaining Message Groups is that it provides sticky load balancing of messages across consumers; where the JMSXGroupID is kinda like a HTTP session ID or cookie value and the message broker is acting like a HTTP load balancer.</p>
+    <h3><a name="MessageGroups-Example"></a>Example</h3>
+    <p>Lets say we are doing some kind of order matching system where people are buying and selling things (stocks, shares, placing online bets, whatever).</p>
+    <p>You want to have consumers who match bids and offers for different items (stocks / bets) so they want to keep in RAM for performance a sub-set of the data set.</p>
+    <p>So set the JMSXGroupID to be MSFT, IBM, SUNW and so forth to use the stock symbol to define the message group. (It can be any string whatsoever; maybe combining trading book, trading exchange, date and so forth - the more specific the group ID, the more concurrent you can run).</p>
+    <p>So assuming we are buying and selling MSFT, IBM, SUNW shares; the Message Groups feature guarrentees that all the MSFT messages will be processed in order by the same consumer; ditto for IBM and SUNW.</p>
+    <h3><a name="MessageGroups-Impliciations"></a>Impliciations</h3>
+    <p>Message Groups mean you get the power of <b>grid</b> processing of messages across a cluster of consumers with reliability, auto-failover, load balancing but you can also order the processing of messages too. So its the best of both worlds.</p>
+    <p>However using the above example, what Message Groups actually do is to partition your work load across consumers using a user defineable partition strategy - the JMSXGroupID value.</p>
+    <p>The neat thing about this is that you can do neat things like use lots of RAM caching; keep the order for MSFT in RAM in the MSFT consumer; keep the IBM orders in RAM in the IBM consumer - since the message broker is partitioning for you, you do not have to rely on a distributed cache with inter-cache synchronisation and locking to take advantage of caching.</p>
+    <p>The great thing is - to the application developer, it looks like a simple 1 consumer world where you process messages and do your job; leaving the broker to do all the hard stuff for you</p>
+    <ul>
+      <li>partioning the traffic</li>
+      <li>load balancing of message groups across consumers</li>
+      <li>auto-failover of groups to different consumers as consumers come and go</li>
+    </ul>
+    <p>In summary; if ordering or per-message caching and synchronization are in any way important to you then we highly recommend you use message groups to partition your traffic.</p>
+  </div>
+</div>
+
+          &nbsp;
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+

Added: incubator/activemq/site/Message+Redelivery+and+DLQ+Handling
URL: http://svn.apache.org/viewcvs/incubator/activemq/site/Message%2BRedelivery%2Band%2BDLQ%2BHandling?rev=374430&view=auto
==============================================================================
--- incubator/activemq/site/Message+Redelivery+and+DLQ+Handling (added)
+++ incubator/activemq/site/Message+Redelivery+and+DLQ+Handling Thu Feb  2 08:31:10 2006
@@ -0,0 +1,248 @@
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+  <div id="Content">
+    <h3><a name="MessageRedeliveryandDLQHandling-Overview"></a>Overview</h3>
+    <p>Messages are redelivered to a client when:</p>
+    <p class="paragraph">
+      <ol>
+        <li>A transacted session is used and rollback() is called.</li>
+        <li>A transacted session is closed before commit is called.</li>
+        <li>A session is using CLIENT_ACKNOWLEDGE and Session.recover() is called.</li>
+      </ol>
+    </p>
+    <h3><a name="MessageRedeliveryandDLQHandling-Behaviorinthe3.xbrokers"></a>Behavior in the 3.x brokers</h3>
+    <p>Acks/Nacks would be sent to the broker for each message that need to be redelivered. The broker would then re-deliver the messages to a consumer. The broker could implment broker side redelivery process as he was aware of when messages were being redelivered to the client. He could send the message to a DLQ after a specified number of failed deliverys.</p>
+    <h3><a name="MessageRedeliveryandDLQHandling-Behaviorinthe4.xbrokers"></a>Behavior in the 4.x brokers</h3>
+    <p>Acks are not sent to the broker till the last possible moment. In the transacted case, that's before the transaction commits. A single ranged ack is sent to the broker instead of multiple acks for each message consumed. On rollback, since nothing has been acked yet, and all messages are still available in an internal consumer queue, the messages are re-dispatched from the internal consumer queue. This reduces redelivery dispatch overhead, at the cost of the broker not being aware that redeliveries are occuring. Therefore the way Redeliverys and DQL handling is done needs to be rearchitected in the 4.x brokers.</p>
+    <p>Another bonus of this approach is that re-tried messages can preserve order very easily (which is really hard to do in the 3.x version)</p>
+    <p>The broker transmits the default delivery policy that he prefers to a client connection in his BrokerInfo command packet. But the client can override the policy settings by using the ActiveMQConnection.getRedeliveryPolicy() method:</p>
+    <p class="paragraph">
+      <div class="code">
+        <div class="codeContent"><pre class="code-java">RedeliveryPolicy policy = connection.getRedeliveryPolicy();
+policy.setInitialRedeliveryDelay(500);
+policy.setBackOffMultiplier(2);
+policy.setUseExponentialBackOff(<span class="code-keyword">true</span>);
+policy.setMaximumRedeliveries(2);</pre></div>
+      </div>
+    </p>
+    <p>Once a message's redelivery attempts exceeds the maximumRedeliveries configured for the RedeliveryPolicy, a &quot;Poison ack&quot; is sent back to the broker letting him know that the message was considered a poison pill. The Broker then takes the message and sends it to a Dead Letter Queue so that it can be analyzed later on.</p>
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+

Added: incubator/activemq/site/Multicast+-+Watch+out+for+IPV6+vs+IPV4+support+on+your+operating+system+or+distribution+or+network
URL: http://svn.apache.org/viewcvs/incubator/activemq/site/Multicast%2B-%2BWatch%2Bout%2Bfor%2BIPV6%2Bvs%2BIPV4%2Bsupport%2Bon%2Byour%2Boperating%2Bsystem%2Bor%2Bdistribution%2Bor%2Bnetwork?rev=374430&view=auto
==============================================================================
--- incubator/activemq/site/Multicast+-+Watch+out+for+IPV6+vs+IPV4+support+on+your+operating+system+or+distribution+or+network (added)
+++ incubator/activemq/site/Multicast+-+Watch+out+for+IPV6+vs+IPV4+support+on+your+operating+system+or+distribution+or+network Thu Feb  2 08:31:10 2006
@@ -0,0 +1,251 @@
+
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+    <li><a href="JMeter+Performance+Tests" title="JMeter Performance Tests">JMeter Performance Tests</a></li>
+    <li><a href="Release+Guide" title="Release Guide">Release Guide</a></li>
+    <li><a href="JUnit+Reports" title="JUnit Reports">JUnit Reports</a></li>
+    <li><span class="nobr"><a href="http://activemq.codehaus.org/maven/clover/" rel="nofollow">Clover Report</a></span></li>
+    <li><a href="Source+XRef" title="Source XRef">Source XRef</a></li>
+    <li><a href="Test+Source+XRef" title="Test Source XRef">Test Source XRef</a></li>
+    <li><span class="nobr"><a href="http://activemq.codehaus.org/maven/activemq.xsd.html" rel="nofollow">XSD</a></span></li>
+  </ul>
+  <h3><a name="Navigation-Toolsweuse"></a>Tools we use</h3><span><span class="nobr"><a href="http://www.yourkit.com" rel="nofollow"><img align="absmiddle" border=0 src="/download/attachments/23786/yourkit.jpg"></a></span></span></span>
+
+            <h3 class="heading3">Feeds</h3>
+            <table border="0" cellspacing="4px">
+            <tr>
+              <td align="right">
+                <a href="http://docs.codehaus.org/spaces/rss.action?key=ACTIVEMQ&newPages=false"><img src="http://docs.codehaus.org/images/icons/rss.gif" border="0"></a><br/>
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+        </td>
+        <td id="rightColumn" valign="top">
+
+          <div id="page_title">
+            <table width="100%">
+              <tr>
+                <td>
+            Multicast - Watch out for IPV6 vs IPV4 support on your operating system or distribution or network 
+                </td>
+                <td align="right">
+            
+                </td>
+              </tr>
+            </table>
+          </div>
+
+
+          <div>
+  <div id="Content">
+    <p>You may wonder why you are not receiving any message at all during multicast, maybe you have just tried everything, and even on some other OS or distributions and JDK and realize that it works in some place and not on other... you may have tried a small C program to do the same..and it worked well.. you're feeling the pressure on your neck...what could be wrong on YOUR application on THIS OS/distribution...</p>
+    <p>As a default, on the Linux platform, if you have IPV6 support enabled in your kernel, the Java Runtime (since 1.4 version) will use IPV6 sockets to communicate. That's perfectly fine, except that your network may not be configured for IPV6. So everything will be dropped...and nothing will ever be received on the consumer side (which maybe even does not support IPV6).</p>
+    <p>There's a solution to this problem: Force IPV4 stack to be used by the Java Runtime. This can be done using a system property: </p>
+    <p class="paragraph">
+      <div class="preformatted">
+        <div class="preformattedContent"><pre> -Djava.net.preferIPv4Stack=true
+</pre></div>
+      </div>
+      <table align="center" border=0 cellpadding=5 cellspacing="8px" class="infoMacro" width="85%">
+        <colgroup>
+          <col width=24>
+          <col>
+        </colgroup>
+        <tr>
+          <td valign="top"><img align="absmiddle" alt="" border=0 height=16 src="/images/icons/emoticons/information.gif" width=16></td>
+          <td><b class="strong">Networking IPv6 User Guide</b><br>This information and much more details can be found in the Java Documentation <span class="nobr"><a href="http://java.sun.com/j2se/1.5.0/docs/guide/net/ipv6_guide/" rel="nofollow">Networking IPv6 User Guide</a></span> and in <span class="nobr"><a href="http://java.sun.com/j2se/1.5.0/docs/guide/net/properties.html" rel="nofollow">Networking Properties</a></span></td>
+        </tr>
+      </table>
+    </p>
+    <p>Alternatively you can disable IPV6 support on your Linux machine by adding the following line <b>at the end of /etc/modprobe.conf</b> (<em>as its name suggests immediately, net-pf-10 is the IPV6 networking module</em>)</p>
+    <p class="paragraph">
+      <div class="preformatted">
+        <div class="preformattedContent"><pre>alias net-pf-10 off # disable IPV6
+</pre></div>
+      </div>
+    </p>
+    <p>If you have very knowledgeable sysadmins that are used to these problems (like in a TV or Radio company for instance where they use multicast a lot), they will be able to tell you immediately if IPV6 is supported on the network (alternatively they will be able to tell you as well if multicast is supported and on which address/port you can multicast), this is a plus and will help you tremendously.</p>
+    <p>In some more frequent cases, your sysadmin will be as lost as you are as they are not dealing with these issues very frequently. So good luck for finding out problems. You will need to have a very strict approach to eliminate uncertainties. For this you will need at least a tool like <span class="nobr"><a href="http://www.ethereal.com" rel="nofollow">ethereal</a></span> (works on unix, linux and windows)</p>
+  </div>
+</div>
+
+          &nbsp;
+        </td>
+      </tr>
+      <tr>
+        <td colspan="3" id="footer">
+          <table width="100%"> 
+            <tr>
+              <td align="left" valign="top">
+          
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+          <a style="color:#999;" href="http://docs.codehaus.org/pages/editpage.action?spaceKey=ACTIVEMQ&title=Multicast+-+Watch+out+for+IPV6+vs+IPV4+support+on+your+operating+system+or+distribution+or+network">[ edit ]</a>
+              </td>
+            </tr>
+          <table>
+        </td>
+      </tr>
+    </table>
+  </body>
+
+</html>
+
+

Added: incubator/activemq/site/Multiple+consumers+on+a+queue
URL: http://svn.apache.org/viewcvs/incubator/activemq/site/Multiple%2Bconsumers%2Bon%2Ba%2Bqueue?rev=374430&view=auto
==============================================================================
--- incubator/activemq/site/Multiple+consumers+on+a+queue (added)
+++ incubator/activemq/site/Multiple+consumers+on+a+queue Thu Feb  2 08:31:10 2006
@@ -0,0 +1,227 @@
+
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+<html>
+  <head>
+    <link rel="stylesheet" href="site.css" type="text/css">
+
+
+
+    <title>ActiveMQ - Multiple consumers on a queue</title>
+  </head>
+
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+      <tr>
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+            <tr id="header_row">
+              <td align="left" valign="middle" style="padding:0px;margin:0px;">
+                <span id="Content"><span><span class="nobr"><a href="http://incubator.apache.org/activemq" rel="nofollow"><img align="absmiddle" border=0 src="images/logo.gif"></a></span></span></span>
+
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+              <td align="left">
+                <a href="">Home</a>  | <a href="FAQ">FAQ</a> &gt; <a href="JMS">JMS</a> &gt; Multiple consumers on a queue
+              </td>
+              <td align="right">
+                  <span id="Content"><span><a href="Download" title="Download">Download</a> | <span class="nobr"><a href="http://activemq.codehaus.org/maven/apidocs/" rel="nofollow">JavaDocs for 4.x</a></span> <span class="nobr"><a href="http://activemq.org/maven/activemq-3/activemq-core/apidocs/" rel="nofollow">3.x</a></span> | <a href="Source" title="Source">Source</a> | <span class="nobr"><a href="http://docs.codehaus.org/pages/listpages.action?key=ACTIVEMQ" rel="nofollow">Wiki</a></span> |<span class="nobr"><a href="irc://irc.codehaus.org/activemq" rel="nofollow">IRC</a></span> | <span class="nobr"><a href="http://servlet.uwyn.com/drone/log/hausbot/activemq" rel="nofollow">IRC Log</a></span> | <a href="Mailing+Lists" title="Mailing Lists">Mailing Lists</a> | <span class="nobr"><a href="http://forums.logicblaze.com/forums/show/1.page" rel="nofollow">Discussion Forum</a></span> | <span class="nobr"><a href="http://jira.logicblaze.com/jira/browse/AMQ" rel="nofollow">Support
 </a></span></span></span>
+
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+          </table>
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+          <span id="Content"><h3><a name="Navigation-Overview"></a>Overview</h3>
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+  </ul>
+  <h3><a name="Navigation-Toolsweuse"></a>Tools we use</h3><span><span class="nobr"><a href="http://www.yourkit.com" rel="nofollow"><img align="absmiddle" border=0 src="/download/attachments/23786/yourkit.jpg"></a></span></span></span>
+
+            <h3 class="heading3">Feeds</h3>
+            <table border="0" cellspacing="4px">
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+        <td id="rightColumn" valign="top">
+
+          <div id="page_title">
+            <table width="100%">
+              <tr>
+                <td>
+            Multiple consumers on a queue 
+                </td>
+                <td align="right">
+            
+                </td>
+              </tr>
+            </table>
+          </div>
+
+
+          <div>
+  <div id="Content">
+    <p>If you want to consume concurrently from a queue, then you must use a different session for each consumer. </p>
+    <p>This is because you must have a session per thread. The JMS contract is that only 1 session is used by one thread at once - which if you're using consumers means that only 1 consumer can receive messages at once if using the same session. So if you want concurrent consumption of messages, you need to use different sessions for each consumer.</p>
+    <p>However its your call on how many connections you have. In a normal network based mode, sharing the same connection across sessions will essentially multiplex traffic across a single socket (and so reduce resource usage at the cost of more synchronization). So sometimes there's a need to use more connections, as typically using different sockets concurrently tends to be a bit faster than using a single one). </p>
+    <p>Incidentally in the JCA specifications in J2EE 1.4, Resource Adapters will typically create 1 connection for each session, so there's a 1-1 mapping between the two.</p>
+  </div>
+</div>
+
+          &nbsp;
+        </td>
+      </tr>
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+        <td colspan="3" id="footer">
+          <table width="100%"> 
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+          <a style="color:#999;" href="http://docs.codehaus.org/pages/editpage.action?spaceKey=ACTIVEMQ&title=Multiple+consumers+on+a+queue">[ edit ]</a>
+              </td>
+            </tr>
+          <table>
+        </td>
+      </tr>
+    </table>
+  </body>
+
+</html>
+
+

Added: incubator/activemq/site/Navigation
URL: http://svn.apache.org/viewcvs/incubator/activemq/site/Navigation?rev=374430&view=auto
==============================================================================
--- incubator/activemq/site/Navigation (added)
+++ incubator/activemq/site/Navigation Thu Feb  2 08:31:10 2006
@@ -0,0 +1,340 @@
+
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+<html>
+  <head>
+    <link rel="stylesheet" href="site.css" type="text/css">
+
+
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+    <title>ActiveMQ - Navigation</title>
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