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From "Dejan Bosanac (Confluence)" <conflue...@apache.org>
Subject [CONF] Apache ActiveMQ > NIO Transport Reference
Date Thu, 25 Feb 2016 15:57:07 GMT
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a page</td> 
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collapse; width: 16px; padding: 9px 8px 0px 0px; mso-text-raise: 5px; mso-line-height-rule:
exactly"><a href="https://cwiki.apache.org/confluence/display/ACTIVEMQ/NIO+Transport+Reference?src=mail&amp;src.mail.timestamp=1456415827616&amp;src.mail.notification=com.atlassian.confluence.plugins.confluence-content-notifications-plugin%3Apage-edited-notification&amp;src.mail.recipient=8aa980874e36a1eb014e36a2a6263ca9&amp;src.mail.action=view"
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icon" height="16" width="16" border="0"></a></td> 
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5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" id="page-title-pattern-header-container"><span
id="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size:
20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align:
middle"><a href="https://cwiki.apache.org/confluence/display/ACTIVEMQ/NIO+Transport+Reference?src=mail&amp;src.mail.timestamp=1456415827616&amp;src.mail.notification=com.atlassian.confluence.plugins.confluence-content-notifications-plugin%3Apage-edited-notification&amp;src.mail.recipient=8aa980874e36a1eb014e36a2a6263ca9&amp;src.mail.action=view"
title="NIO Transport Reference" style="color: #3b73af; text-decoration: none">NIO Transport
Reference</a></span></td> 
</tr> 
</tbody> 
</table> </td> 
</tr> 
<tr> 
<td class="email-content-main mobile-expand" style="padding: 0px; border-collapse: collapse;
border-left: 1px solid #ccc; border-right: 1px solid #ccc; border-top: 0; border-bottom: 0;
padding: 0 15px 15px 16px; background-color: #fff"> 
<table class="content-excerpt-pattern" cellspacing="0" cellpadding="0" border="0" width="100%"
style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333;
font-family: Arial, sans-serif; font-size: 14px; line-height: 20px; mso-line-height-rule:
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<tbody> 
<tr> 
<td class="content-excerpt-pattern-container mobile-resize-text " style="padding: 0px;
border-collapse: collapse; padding: 0 0 0 24px"> <p class="diff-block-target diff-block-context"
style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-added" id="added-diff-0"
style="font-size: 100%; background-color: #ddfade;">NIO Transport is very similar to the
regular </span><a href="/confluence/pages/viewpage.action?pageId=35993" style="color:
#3b73af; text-decoration: none"><span class="diff-html-added" style="font-size: 100%;
background-color: #ddfade;">TCP transport</span></a><span class="diff-html-added"
style="font-size: 100%; background-color: #ddfade;">. The difference is that it is implemented
using NIO API which can help with performance and scalability.&nbsp;NIO is a server side
transport option only. Trying to use it on the client side will instantiate the regular TCP
transport.</span> </p> <h4 id="NIOTransportReference-ConfigurationSyntax" class="diff-block-target
diff-block-context" style="margin: 10px 0 0 0; font-size: 14px; line-height: 20px; margin:
20px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">Configuration Syntax</span> </h4> <p class="diff-block-target
diff-block-context" style="margin: 10px 0 0 0"> <code style="font-family: monospace"><strong><span
class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">nio://hostname:port?key=value</span></strong></code>
</p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Configuration
options are the same as for the </span><a href="/confluence/pages/viewpage.action?pageId=35993"
style="color: #3b73af; text-decoration: none"><span class="diff-html-added" style="font-size:
100%; background-color: #ddfade;">TCP transport</span></a><span class="diff-html-added"
style="font-size: 100%; background-color: #ddfade;">.</span> </p> <p class="diff-block-target
diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size:
100%; background-color: #ddfade;">Note that the original NIO transport is a replacement
for the tcp transport that uses OpenWire protocol. Other network protocols, such AMQP, MQTT,
Stomp, etc also have their own NIO transport implementations. It configured usually, by adding
"+nio" suffix to the protocol prefix, like</span> </p> 
<table class="diff-macro diff-html-added diff-block-target diff-block-context" style="background-color:
#f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;background-color:
#ddfade;border-color: #93c49f;; border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace:
0pt; color: #333"> 
<thead> 
<tr> 
<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight:
normal;padding: 5px;"><span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height:
20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB/5982/f2b47fb3d636c8bc9fd0b11c0ec6d0ae18646be7.1/_/plugins/servlet/confluence/placeholder/macro-icon?name=code"
style="padding-right: 5px; vertical-align: text-bottom;"> </span>Code Block</span></th>

</tr> 
</thead> 
<tbody> 
<tr> 
<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding:
10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top:
0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">mqtt+nio://localhost:1883</span>
</pre> </td> 
</tr> 
</tbody> 
</table> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0
0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">All
protocol specific configuration should be applicable to the nio version of the transport as
well.</span> </p> <h3 id="NIOTransportReference-TuningNIOtransportthreadusage"
class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 16px; line-height:
25px; margin: 30px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">Tuning NIO transport thread usage</span> </h3> <p class="diff-block-target
diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size:
100%; background-color: #ddfade;">One of the main advantages of using NIO instead of the
regular versions of the transport is that it can scale better and support larger number of
connections. The main limit in this scenario is the number of threads the system in using.
In blocking implementations of the transports, one thread is used per connection. In NIO implementation,
there's a shared pool of threads that will take the load, so that number of connections are
not directly to the number of threads used in the system.</span> </p> <p class="diff-block-target
diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size:
100%; background-color: #ddfade;">You can tune the number of threads used by the transport
using the following system properties (available since 5.14.0)</span> </p> 
<div class="table-wrap diff-block-target diff-block-context" style="margin: 10px 0 0 0;
overflow-x: auto"> 
<table class="confluenceTable" style="border-collapse: collapse; border: 1px solid #ddd;;
border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333; border-collapse:
collapse; margin: 10px 0 0 0; overflow-x: auto; margin-top: 0"> 
<tbody> 
<tr> 
<th class="confluenceTh" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em;
text-align: left; vertical-align: top;background-color: #F0F0F0; font-weight: bold;; border:
1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left; background-color:
#f0f0f0; font-weight: bold"><span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">Property</span></th> 
<th class="confluenceTh" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em;
text-align: left; vertical-align: top;background-color: #F0F0F0; font-weight: bold;; border:
1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left; background-color:
#f0f0f0; font-weight: bold"><span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">Default value</span></th> 
<th class="confluenceTh" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em;
text-align: left; vertical-align: top;background-color: #F0F0F0; font-weight: bold;; border:
1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left; background-color:
#f0f0f0; font-weight: bold"><span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">Description</span></th> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em;
text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px
solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"><span class="diff-html-added"
style="font-size: 100%; background-color: #ddfade;">org.apache.activemq.transport.nio.SelectorManager.corePoolSize</span></td>

<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em;
text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px
solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"><span class="diff-html-added"
style="font-size: 100%; background-color: #ddfade;">10</span></td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em;
text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px
solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin:
10px 0 0 0; margin-top: 0"> <span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">The number of threads to keep in the pool, even if they are idle</span>
</p> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em;
text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px
solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"><span class="diff-html-added"
style="font-size: 100%; background-color: #ddfade;">org.apache.activemq.transport.nio.SelectorManager.maximumPoolSize</span></td>

<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em;
text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px
solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"><span class="diff-html-added"
style="font-size: 100%; background-color: #ddfade;">1024</span></td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em;
text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px
solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin:
10px 0 0 0; margin-top: 0"> <span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">The maximum number of threads to allow in the pool</span> </p> </td>

</tr> 
</tbody> 
</table> 
</div> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">If
you want to scale your broker to support thousands of connections to it, you need to first
find the limits of number of threads JVM process is allowed to create. Then you can set these
properties to some value below that (broker need more threads to operate normally). For more
information on thread usage by destinations and how to limit those, please take a look at
</span><a href="/confluence/pages/viewpage.action?pageId=118144" style="color: #3b73af;
text-decoration: none"><span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">Scaling Queues</span></a><span class="diff-html-added" style="font-size:
100%; background-color: #ddfade;">&nbsp;or&nbsp;</span><a href="http://svn.apache.org/repos/asf/activemq/trunk/assembly/src/sample-conf/activemq-scalability.xml"
class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none"><span
class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">this configuration
file</span></a><span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">. For example you can add the following</span> </p> 
<table class="diff-macro diff-html-added diff-block-target diff-block-context" style="background-color:
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0pt; color: #333"> 
<thead> 
<tr> 
<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight:
normal;padding: 5px;"><span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height:
20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB/5982/f2b47fb3d636c8bc9fd0b11c0ec6d0ae18646be7.1/_/plugins/servlet/confluence/placeholder/macro-icon?name=code"
style="padding-right: 5px; vertical-align: text-bottom;"> </span>Code Block</span></th>

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</thead> 
<tbody> 
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding:
10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top:
0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">ACTIVEMQ_OPTS="$ACTIVEMQ_OPTS
-Dorg.apache.activemq.transport.nio.SelectorManager.corePoolSize=2000 -Dorg.apache.activemq.transport.nio.SelectorManager.maximumPoolSize=2000"</span>
</pre> </td> 
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</tbody> 
</table> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0
0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">to
the startup script (</span><code style="font-family: monospace"><span class="diff-html-added"
style="font-size: 100%; background-color: #ddfade;">${ACTIVEMQ_HOME}/bin/env</span></code><span
class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> for example)&nbsp;to
have a constant pool of 2000 threads handling connections. With the setting like this, the
broker should be able to accept the number of connections up to the system limits.</span>
</p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">&nbsp;</span>
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