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Added: websites/production/activemq/content/artemis/docs/1.5.4/notice.html
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--- websites/production/activemq/content/artemis/docs/1.5.4/notice.html (added)
+++ websites/production/activemq/content/artemis/docs/1.5.4/notice.html Sun Mar 12 16:08:18 2017
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Added: websites/production/activemq/content/artemis/docs/1.5.4/paging.html
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+ <h1>
+ <i class="fa fa-circle-o-notch fa-spin"></i>
+ <a href="." >Paging</a>
+ </h1>
+</div>
+
+
+
+
+ <div class="page-wrapper" tabindex="-1" role="main">
+ <div class="page-inner">
+
+<div id="book-search-results">
+ <div class="search-noresults">
+
+ <section class="normal markdown-section">
+
+ <h1 id="paging">Paging</h1>
+<p>Apache ActiveMQ Artemis transparently supports huge queues containing millions of
+messages while the server is running with limited memory.</p>
+<p>In such a situation it's not possible to store all of the queues in
+memory at any one time, so Apache ActiveMQ Artemis transparently <em>pages</em> messages into
+and out of memory as they are needed, thus allowing massive queues with
+a low memory footprint.</p>
+<p>Apache ActiveMQ Artemis will start paging messages to disk, when the size of all
+messages in memory for an address exceeds a configured maximum size.</p>
+<p>The default configuration from Artemis has destinations with paging.</p>
+<h2 id="page-files">Page Files</h2>
+<p>Messages are stored per address on the file system. Each address has an
+individual folder where messages are stored in multiple files (page
+files). Each file will contain messages up to a max configured size
+(<code>page-size-bytes</code>). The system will navigate on the files as needed,
+and it will remove the page file as soon as all the messages are
+acknowledged up to that point.</p>
+<p>Browsers will read through the page-cursor system.</p>
+<p>Consumers with selectors will also navigate through the page-files and it will ignore messages that don't match the criteria.</p>
+<blockquote>
+<p><em>Warning:</em>
+When you have a queue, and consumers filtering the queue with a very restrictive selector you may get into a situation where you won't be able to read more data from paging until you consume messages from the queue.</p>
+<p>Example: in one consumer you make a selector as 'color="red"'
+but you only have one color red 1 millions messages after blue, you won't be able to consume red until you consume blue ones.</p>
+<p>This is different to browsing as we will "browse" the entire queue looking for messages and while we "depage" messages while feeding the queue.</p>
+</blockquote>
+<h2 id="configuration">Configuration</h2>
+<p>You can configure the location of the paging folder</p>
+<p>Global paging parameters are specified on the main configuration file
+(<code>broker.xml</code>).</p>
+<pre><code><configuration xmlns="urn:activemq"
+ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="urn:activemq /schema/artemis-server.xsd">
+...
+<paging-directory>/somewhere/paging-directory</paging-directory>
+...
+</code></pre><p> Property Name Description Default</p>
+<hr>
+<p> <code>paging-directory</code> Where page files are stored. Apache ActiveMQ Artemis will create one folder for each address being paged under this configured location. data/paging</p>
+<p> : Paging Configuration Parameters</p>
+<h2 id="paging-mode">Paging Mode</h2>
+<p>As soon as messages delivered to an address exceed the configured size,
+that address alone goes into page mode.</p>
+<blockquote>
+<p><strong>Note</strong></p>
+<p>Paging is done individually per address. If you configure a
+max-size-bytes for an address, that means each matching address will
+have a maximum size that you specified. It DOES NOT mean that the
+total overall size of all matching addresses is limited to
+max-size-bytes.</p>
+</blockquote>
+<h2 id="configuration">Configuration</h2>
+<p>Configuration is done at the address settings, done at the main
+configuration file (<code>broker.xml</code>).</p>
+<pre><code><address-settings>
+ <address-setting match="jms.someaddress">
+ <max-size-bytes>104857600</max-size-bytes>
+ <page-size-bytes>10485760</page-size-bytes>
+ <address-full-policy>PAGE</address-full-policy>
+ </address-setting>
+</address-settings>
+</code></pre><p>This is the list of available parameters on the address settings.</p>
+<table summary="Server Configuration" border="1">
+ <colgroup>
+ <col>
+ <col>
+ <col>
+ </colgroup>
+ <thead>
+ <tr>
+ <th>Property Name</th>
+ <th>Description</th>
+ <th>Default</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td>`max-size-bytes`</td>
+ <td>What's the max memory the address could have before entering on page mode.</td>
+ <td>-1 (disabled)</td>
+ </tr>
+ <tr>
+ <td>`page-size-bytes`</td>
+ <td>The size of each page file used on the paging system</td>
+ <td>10MiB (10 \* 1024 \* 1024 bytes)</td>
+ </tr>
+ <tr>
+ <td>`address-full-policy`</td>
+ <td>This must be set to PAGE for paging to enable. If the value is PAGE then further messages will be paged to disk. If the value is DROP then further messages will be silently dropped. If the value is FAIL then the messages will be dropped and the client message producers will receive an exception. If the value is BLOCK then client message producers will block when they try and send further messages.</td>
+ <td>PAGE</td>
+ </tr>
+ <tr>
+ <td>`page-max-cache-size`</td>
+ <td>The system will keep up to `page-max-cache-size` page files in memory to optimize IO during paging navigation.</td>
+ <td>5</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="global-max-size">Global Max Size</h2>
+<p>Beyond the max-size-bytes on the address you can also set the global-max-size on the main configuration. If you set max-size-bytes = -1 on paging the global-max-size can still be used.</p>
+<p>When you have more messages than what is configured global-max-size any new produced message will make that destination to go through its paging policy. </p>
+<h2 id="dropping-messages">Dropping messages</h2>
+<p>Instead of paging messages when the max size is reached, an address can
+also be configured to just drop messages when the address is full.</p>
+<p>To do this just set the <code>address-full-policy</code> to <code>DROP</code> in the address
+settings</p>
+<h2 id="dropping-messages-and-throwing-an-exception-to-producers">Dropping messages and throwing an exception to producers</h2>
+<p>Instead of paging messages when the max size is reached, an address can
+also be configured to drop messages and also throw an exception on the
+client-side when the address is full.</p>
+<p>To do this just set the <code>address-full-policy</code> to <code>FAIL</code> in the address
+settings</p>
+<h2 id="blocking-producers">Blocking producers</h2>
+<p>Instead of paging messages when the max size is reached, an address can
+also be configured to block producers from sending further messages when
+the address is full, thus preventing the memory being exhausted on the
+server.</p>
+<p>When memory is freed up on the server, producers will automatically
+unblock and be able to continue sending.</p>
+<p>To do this just set the <code>address-full-policy</code> to <code>BLOCK</code> in the address
+settings</p>
+<p>In the default configuration, all addresses are configured to block
+producers after 10 MiB of data are in the address.</p>
+<h2 id="caution-with-addresses-with-multiple-queues">Caution with Addresses with Multiple Queues</h2>
+<p>When a message is routed to an address that has multiple queues bound to
+it, e.g. a JMS subscription in a Topic, there is only 1 copy of the
+message in memory. Each queue only deals with a reference to this.
+Because of this the memory is only freed up once all queues referencing
+the message have delivered it.</p>
+<p>If you have a single lazy subscription, the entire address will suffer
+IO performance hit as all the queues will have messages being sent
+through an extra storage on the paging system.</p>
+<p>For example:</p>
+<ul>
+<li><p>An address has 10 queues</p>
+</li>
+<li><p>One of the queues does not deliver its messages (maybe because of a
+slow consumer).</p>
+</li>
+<li><p>Messages continually arrive at the address and paging is started.</p>
+</li>
+<li><p>The other 9 queues are empty even though messages have been sent.</p>
+</li>
+</ul>
+<p>In this example all the other 9 queues will be consuming messages from
+the page system. This may cause performance issues if this is an
+undesirable state.</p>
+<h2 id="max-disk-usage">Max Disk Usage</h2>
+<p>The System will perform scans on the disk to determine if the disk is beyond a configured limit.
+These are configured through 'max-disk-usage' in percentage. Once that limit is reached any
+message will be blocked. (unless the protocol doesn't support flow control on which case there will be an exception thrown and the connection for those clients dropped).</p>
+<h2 id="example">Example</h2>
+<p>See the <a href="examples.html">examples</a> chapter for an example which shows how to use paging with Apache ActiveMQ Artemis.</p>
+
+
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