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               <h1>Why is my ActiveMQ/JMS MDB not scaling as expected?</h1>
             </div>
           </div>
         </div>
         <div class="row">

             <div class="col-md-12">
                 <div class="sect1">
 <h2 id="_why_my_activemq_jms_mdb_is_not_scaling_as_expected">Why my ActiveMQ/JMS MDB is not scaling as expected?</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>There are multiple configurations points to ensure you scale as much as you want.</p>
 </div>
 <div class="paragraph">
 <p>Here some common configuration to validate (note that when possible the sample value is the default):</p>
 </div>
 <div class="ulist">
 <ul>
 <li>
 <p>The resource adapter thread pool ("worker threads" or <code>WorkManager</code>) limits the number of max work threads:</p>
 </li>
 </ul>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-xml" data-lang="xml">&lt;Resource id="my resource adapter" ....&gt;
   # using -1 will make the server using cached threads (unbounded)
   # min recommanded: maxSessions + 1 (for connect())
   threadPoolSize = 30
 &lt;/Resource&gt;</code></pre>
 </div>
 </div>
 <div class="ulist">
 <ul>
 <li>
 <p>Then the MDB container itself has a upper bound through <code>InstanceLimit</code> which controls the max MDB instance count:</p>
 </li>
 </ul>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-xml" data-lang="xml">&lt;Container id="my mdb container" type="MESSAGE"&gt;
     # -1 will disable it
     # min recommanded = maxSessions
     InstanceLimit = 10
 &lt;/Container&gt;</code></pre>
 </div>
 </div>
 <div class="ulist">
 <ul>
 <li>
 <p>ActiveMQ <code>maxSessions</code> controls how many sessions a MDB can use:</p>
 </li>
 </ul>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">@MessageDriven(activationConfig = {
         @javax.ejb.ActivationConfigProperty(propertyName = "maxSessions", propertyValue = "1"),
         @javax.ejb.ActivationConfigProperty(propertyName = "destination", propertyValue = "target-queue")
 })
 public static class MyMdb implements MessageListener {
     @Override
     public void onMessage(final Message message) {
         // ...
     }
 }</code></pre>
 </div>
 </div>
 <div class="ulist">
 <ul>
 <li>
 <p>The ConnectionFactory has also an instance pool through geronimo-connector logic, configuration
 can make the behavior changing but this is controlled through pool related variables (the pool and resource properties are merged in the definition):</p>
 </li>
 </ul>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-xml" data-lang="xml">&lt;Resource id="my connection factory" type="ConnectionFactory"&gt;
     # recommanded to be aligned on maxSessions
     PoolMaxSize = 10
     # for 100% MDB (no client) you can evaluate to turn it off/false, for client it can still be useful depending what you do
     Pooling = true
 &lt;/Resource&gt;</code></pre>
 </div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_slow_message_consumption">Slow Message Consumption</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>If you find you have a slow consumption of messages there are several options to have a look (activemq website explains it very well)
 but one very impacting option can be the prefetch size.</p>
 </div>
 </div>
 </div>
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	<h1>Why is my ActiveMQ/JMS MDB not scaling as expected?</h1>
	</div>
	</div>
	</div>
	<div class="row">

	<div class="col-md-12">
	<div class="sect1">
	<h2 id="_why_my_activemq_jms_mdb_is_not_scaling_as_expected">Why my ActiveMQ/JMS MDB is not scaling as expected?</h2>
	<div class="sectionbody">
	<div class="paragraph">
	<p>There are multiple configurations points to ensure you scale as much as you want.</p>
	</div>
	<div class="paragraph">
	<p>Here some common configuration to validate (note that when possible the sample value is the default):</p>
	</div>
	<div class="ulist">
	<ul>
	<li>
	<p>The resource adapter thread pool ("worker threads" or <code>WorkManager</code>) limits the number of max work threads:</p>
	</li>
	</ul>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-xml" data-lang="xml"><Resource id="my resource adapter" ....>
	# using -1 will make the server using cached threads (unbounded)
	# min recommanded: maxSessions + 1 (for connect())
	threadPoolSize = 30
	</Resource></code></pre>
	</div>
	</div>
	<div class="ulist">
	<ul>
	<li>
	<p>Then the MDB container itself has a upper bound through <code>InstanceLimit</code> which controls the max MDB instance count:</p>
	</li>
	</ul>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-xml" data-lang="xml"><Container id="my mdb container" type="MESSAGE">
	# -1 will disable it
	# min recommanded = maxSessions
	InstanceLimit = 10
	</Container></code></pre>
	</div>
	</div>
	<div class="ulist">
	<ul>
	<li>
	<p>ActiveMQ <code>maxSessions</code> controls how many sessions a MDB can use:</p>
	</li>
	</ul>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">@MessageDriven(activationConfig = {
	@javax.ejb.ActivationConfigProperty(propertyName = "maxSessions", propertyValue = "1"),
	@javax.ejb.ActivationConfigProperty(propertyName = "destination", propertyValue = "target-queue")
	})
	public static class MyMdb implements MessageListener {
	@Override
	public void onMessage(final Message message) {
	// ...
	}
	}</code></pre>
	</div>
	</div>
	<div class="ulist">
	<ul>
	<li>
	<p>The ConnectionFactory has also an instance pool through geronimo-connector logic, configuration
	can make the behavior changing but this is controlled through pool related variables (the pool and resource properties are merged in the definition):</p>
	</li>
	</ul>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-xml" data-lang="xml"><Resource id="my connection factory" type="ConnectionFactory">
	# recommanded to be aligned on maxSessions
	PoolMaxSize = 10
	# for 100% MDB (no client) you can evaluate to turn it off/false, for client it can still be useful depending what you do
	Pooling = true
	</Resource></code></pre>
	</div>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_slow_message_consumption">Slow Message Consumption</h2>
	<div class="sectionbody">
	<div class="paragraph">
	<p>If you find you have a slow consumption of messages there are several options to have a look (activemq website explains it very well)
	but one very impacting option can be the prefetch size.</p>
	</div>
	</div>
	</div>
	</div>

	</div>
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