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| <h1>How do I use durable subscribers in a network of brokers</h1> |
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| <p> <a href="faq">FAQ</a> > <a href="using-apache-activemq">Using Apache ActiveMQ</a> > <a href="how-do-i-use-durable-subscribers-in-a-network-of-brokers">How do I use durable subscribers in a network of brokers</a></p> |
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| <p>Durable subscribers behave a little differently across a cluster of ActiveMQ brokers. The two main issues surround messages getting stuck on other brokers in the network after a durable subscriber has disconnected and reconnected to a different broker in the network without fully unsubscribing. The reasons for disconnecting/reconnecting can be voluntary (where the subscriber is using the failover transport), or involuntary (one of the brokers in the cluster fails).</p> |
| |
| <p>For example, if you have two brokers A and B networked together in both directions to form a cluster, and a durable subscriber connects to broker B, a producer P on broker A will have its messages properly forwarded to broker B and the durable subscriber. However, if the subscriber disconnects and reconnects to broker A, any messages sent by P while the subscriber was away will be stuck on B until the subscriber reconnects to B.</p> |
| |
| <p>The solution is to use <a href="virtual-destinations">Virtual Destinations</a></p> |
| |
| <p>Virtual topics use queues under the covers and this allows ActiveMQ to treat each subscriber as a plain old Queue subscriber. This allows ActiveMQ to replay messages that have been orphaned on another broker in the cluster using this configuration as explained in the <a href="networks-of-brokers">Networks of Brokers</a> documentation:</p> |
| <div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code><destinationPolicy> |
| <policyMap> |
| <policyEntries> |
| <policyEntry queue="TEST.>" enableAudit="false"> |
| <conditionalNetworkBridgeFilterFactory replayWhenNoConsumers="true"/> |
| </policyEntry> |
| </policyEntries> |
| </policyMap> |
| </destinationPolicy> |
| </code></pre></div></div> |
| <p>Also, take a look at <a href="http://svn.apache.org/viewvc/activemq/trunk/activemq-unit-tests/src/test/java/org/apache/activemq/usecases/VirtualTopicNetworkClusterReactivationTest.java?view=markup">this unit test to see the full configuration and usage</a></p> |
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