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| Configuring Transports |
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| Detecting Dead Connections |
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| Detecting Slow Consumers |
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| Detecting Broker Issues (Critical Analysis) |
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| Resource Manager Configuration |
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| Flow Control |
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| Guarantees of sends and commits |
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| Message Redelivery and Undelivered Messages |
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| Message Expiry |
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| Large Messages |
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| Paging |
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| Scheduled Messages |
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| Last-Value Queues |
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| Ring Queues |
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| Retroactive Addresses |
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| Exclusive Queues |
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| Message Grouping |
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| Consumer Priority |
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| Extra Acknowledge Modes |
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| Management |
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| Management Console |
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| Metrics |
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| Security |
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| Masking Passwords |
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| Broker Plugins |
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| Resource Limits |
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| The JMS Bridge |
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| Client Reconnection and Session Reattachment |
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| Diverting and Splitting Message Flows |
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| Core Bridges |
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| Transformers |
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| <li class="chapter " data-level="1.58" data-path="duplicate-detection.html"> |
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| Duplicate Message Detection |
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| <li class="chapter " data-level="1.59" data-path="clusters.html"> |
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| Clusters |
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| <li class="chapter " data-level="1.60" data-path="federation.html"> |
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| <a href="federation.html"> |
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| Federation |
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| Address Federation |
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| </a> |
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| <a href="federation-queue.html"> |
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| Queue Federation |
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| </a> |
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| High Availability and Failover |
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| </a> |
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| Graceful Server Shutdown |
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| </a> |
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| <li class="chapter " data-level="1.63" data-path="libaio.html"> |
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| <a href="libaio.html"> |
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| Libaio Native Libraries |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.64" data-path="thread-pooling.html"> |
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| <a href="thread-pooling.html"> |
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| Thread management |
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| </a> |
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| <li class="chapter " data-level="1.65" data-path="web-server.html"> |
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| <a href="web-server.html"> |
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| Embedded Web Server |
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| </a> |
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| <li class="chapter " data-level="1.66" data-path="logging.html"> |
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| <a href="logging.html"> |
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| Logging |
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| <li class="chapter " data-level="1.67" data-path="rest.html"> |
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| <a href="rest.html"> |
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| REST Interface |
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| </a> |
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| <li class="chapter " data-level="1.68" data-path="embedding-activemq.html"> |
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| <a href="embedding-activemq.html"> |
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| Embedding the Broker |
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| </a> |
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| <li class="chapter " data-level="1.69" data-path="karaf.html"> |
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| Apache Karaf |
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| </a> |
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| Apache Tomcat |
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| <a href="spring-integration.html"> |
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| Spring Integration |
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| </a> |
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| <li class="chapter " data-level="1.72" data-path="cdi-integration.html"> |
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| <a href="cdi-integration.html"> |
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| CDI Integration |
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| </a> |
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| <li class="chapter " data-level="1.73" data-path="intercepting-operations.html"> |
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| <a href="intercepting-operations.html"> |
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| Intercepting Operations |
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| </a> |
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| <a href="data-tools.html"> |
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| Data Tools |
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| </a> |
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| <a href="maven-plugin.html"> |
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| <h1> |
| <i class="fa fa-circle-o-notch fa-spin"></i> |
| <a href="." >Paging</a> |
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| <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 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></p> |
| <p>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> |
| <h3 id="configuration">Configuration</h3> |
| <p>You can configure the location of the paging folder in <code>broker.xml</code>.</p> |
| <ul> |
| <li><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. Default is <code>data/paging</code>.</li> |
| </ul> |
| <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> |
| <h3 id="configuration">Configuration</h3> |
| <p>Configuration is done at the address settings in <code>broker.xml</code>.</p> |
| <pre><code class="lang-xml"><span class="hljs-tag"><<span class="hljs-name">address-settings</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">address-setting</span> <span class="hljs-attr">match</span>=<span class="hljs-string">"jms.someaddress"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">max-size-bytes</span>></span>104857600<span class="hljs-tag"></<span class="hljs-name">max-size-bytes</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">page-size-bytes</span>></span>10485760<span class="hljs-tag"></<span class="hljs-name">page-size-bytes</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">address-full-policy</span>></span>PAGE<span class="hljs-tag"></<span class="hljs-name">address-full-policy</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">address-setting</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">address-settings</span>></span> |
| </code></pre> |
| <blockquote> |
| <p><strong>Note:</strong> |
| The <a href="management.html#configuring-management">management-address</a> |
| settings cannot be changed or overridden ie management |
| messages aren't allowed to page/block/fail and are considered |
| an internal broker management mechanism. |
| The memory occupation of the <a href="management.html#configuring-management">management-address</a> |
| is not considered while evaluating if <a href="#global-max-size">global-max-size</a> |
| is hit and can't cause other non-management addresses to trigger a |
| configured <code>address-full-policy</code>.</p> |
| </blockquote> |
| <p>This is the list of available parameters on the address settings.</p> |
| <table> |
| <thead> |
| <tr> |
| <th>Property Name</th> |
| <th>Description</th> |
| <th>Default</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code>max-size-bytes</code></td> |
| <td>What's the max memory the address could have before entering on page mode.</td> |
| <td>-1 (disabled)</td> |
| </tr> |
| <tr> |
| <td><code>page-size-bytes</code></td> |
| <td>The size of each page file used on the paging system</td> |
| <td>10MB</td> |
| </tr> |
| <tr> |
| <td><code>address-full-policy</code></td> |
| <td>This must be set to <code>PAGE</code> for paging to enable. If the value is <code>PAGE</code> then further messages will be paged to disk. If the value is <code>DROP</code> then further messages will be silently dropped. If the value is <code>FAIL</code> then the messages will be dropped and the client message producers will receive an exception. If the value is <code>BLOCK</code> then client message producers will block when they try and send further messages.</td> |
| <td><code>PAGE</code></td> |
| </tr> |
| <tr> |
| <td><code>page-max-cache-size</code></td> |
| <td>The system will keep up to <code>page-max-cache-size</code> 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 <code>max-size-bytes</code> on the address you can also set the global-max-size |
| on the main configuration. If you set <code>max-size-bytes</code> = <code>-1</code> on paging the |
| <code>global-max-size</code> can still be used.</p> |
| <p>When you have more messages than what is configured <code>global-max-size</code> any new |
| produced message will make that destination to go through its paging policy. </p> |
| <p><code>global-max-size</code> is calculated as half of the max memory available to the Java |
| Virtual Machine, unless specified on the <code>broker.xml</code> configuration.</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-multicast-queues">Caution with Addresses with Multiple Multicast Queues</h2> |
| <p>When a message is routed to an address that has multiple multicast 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 multicast 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 <code>max-disk-usage</code> 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="page-sync-timeout">Page Sync Timeout</h2> |
| <p>The pages are synced periodically and the sync period is configured through |
| <code>page-sync-timeout</code> in nanoseconds. When using NIO journal, by default has |
| the same value of <code>journal-buffer-timeout</code>. When using ASYNCIO, the default |
| should be <code>3333333</code>.</p> |
| <h2 id="example">Example</h2> |
| <p>See the <a href="examples.html#paging">Paging Example</a> which shows how to use paging with |
| Apache ActiveMQ Artemis.</p> |
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