activemq-artemis/examples/features/clustered/clustered-static-oneway
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src/main ARTEMIS-785 - update examples to new addressing model 2016-12-15 13:36:23 +00:00
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readme.html ARTEMIS-789 Fix various failing tests due to addressing changes 2016-12-09 18:43:15 +00:00

readme.html

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  <head>
    <title>ActiveMQ Artemis JMS Load Balanced Static Clustered Queue Example</title>
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     <h1>JMS Load Balanced Static Clustered One Way Queue Example</h1>
     <pre>To run the example, simply type <b>mvn verify</b> from this directory, <br>or <b>mvn -PnoServer verify</b> if you want to start and create the server manually.</pre>

     <p>This example demonstrates a JMS queue deployed on three different nodes. The three nodes are configured to form a one way cluster
       from a <em>static</em> list of nodes. </p>
     <p>A one way cluster is different from a symmetrical cluster in that each node is only connected to one another node in
     a chain type fashion, so server 0 -> server 1 -> server 2</p>
     <p>We then create a consumer on the queue on each node, and we create a producer on only one of the nodes.</p>
     <p>We then send some messages via the producer, and we verify that <b>all</b> consumers receive the sent messages
     in a round-robin fashion.</p>
     <p>In other words, ActiveMQ Artemis <b>load balances</b> the sent messages across all consumers on the cluster</p>
     <p>This example uses JNDI to lookup the JMS Queue and ConnectionFactory objects. If you prefer not to use
     JNDI, these could be instantiated directly.</p>
     <p>Here's the relevant snippet from the server configuration, which tells the server to form a one way cluster between the three nodes
     and to load balance the messages between the nodes. Note that we have set <em>allow-direct-connections-only</em> to true,
     this means that this server will only ever connect the address's specified in the list of connectors. ALso notice
     that <em>max-hops</em> is 2, this is because server 0 is not directly connected to server 2, 2 hops in fact, so we
     allow any updates from servers up to 2 hops away</p>
     <pre class="prettyprint">
     <code>
     &lt;cluster-connection name="my-cluster"&gt;
        &lt;connector-ref>netty-connector&lt;/connector-ref>
        &lt;retry-interval&gt;500&lt;/retry-interval&gt;
        &lt;use-duplicate-detection&gt;true&lt;/use-duplicate-detection&gt;
        &lt;message-load-balancing&gt;STRICT&lt;/message-load-balancing&gt;
        &lt;max-hops&gt;2&lt;/max-hops&gt;
        &lt;static-connectors allow-direct-connections-only="true"&gt;
            &lt;connector-ref>server1-connector&lt;/connector-ref&gt;
         &lt;/static-connectors&gt;
     &lt;/cluster-connection&gt;
     </code>
     </pre>
     <p>For more information on ActiveMQ Artemis load balancing, and clustering in general, please see the clustering
     section of the user manual.</p>
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