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From johndam...@apache.org
Subject svn commit: r1008195 [40/46] - in /websites/production/activemq/content/artemis/docs/1.5.4: ./ diagrams/ gitbook/ gitbook/fonts/ gitbook/fonts/fontawesome/ gitbook/gitbook-plugin-fontsettings/ gitbook/gitbook-plugin-highlight/ gitbook/gitbook-plugin-lu...
Date Sun, 12 Mar 2017 16:08:19 GMT
Added: websites/production/activemq/content/artemis/docs/1.5.4/send-guarantees.html
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--- websites/production/activemq/content/artemis/docs/1.5.4/send-guarantees.html (added)
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+            
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+        <a href="." >Guarantees of sends and commits</a>
+    </h1>
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+                                <h1 id="guarantees-of-sends-and-commits">Guarantees of sends and commits</h1>
+<h2 id="guarantees-of-transaction-completion">Guarantees of Transaction Completion</h2>
+<p>When committing or rolling back a transaction with Apache ActiveMQ Artemis, the request
+to commit or rollback is sent to the server, and the call will block on
+the client side until a response has been received from the server that
+the commit or rollback was executed.</p>
+<p>When the commit or rollback is received on the server, it will be
+committed to the journal, and depending on the value of the parameter
+<code>journal-sync-transactional</code> the server will ensure that the commit or
+rollback is durably persisted to storage before sending the response
+back to the client. If this parameter has the value <code>false</code> then commit
+or rollback may not actually get persisted to storage until some time
+after the response has been sent to the client. In event of server
+failure this may mean the commit or rollback never gets persisted to
+storage. The default value of this parameter is <code>true</code> so the client can
+be sure all transaction commits or rollbacks have been persisted to
+storage by the time the call to commit or rollback returns.</p>
+<p>Setting this parameter to <code>false</code> can improve performance at the expense
+of some loss of transaction durability.</p>
+<p>This parameter is set in <code>broker.xml</code></p>
+<h2 id="guarantees-of-non-transactional-message-sends">Guarantees of Non Transactional Message Sends</h2>
+<p>If you are sending messages to a server using a non transacted session,
+Apache ActiveMQ Artemis can be configured to block the call to send until the message
+has definitely reached the server, and a response has been sent back to
+the client. This can be configured individually for durable and
+non-durable messages, and is determined by the following two parameters:</p>
+<ul>
+<li><p><code>BlockOnDurableSend</code>. If this is set to <code>true</code> then all calls to
+send for durable messages on non transacted sessions will block
+until the message has reached the server, and a response has been
+sent back. The default value is <code>true</code>.</p>
+</li>
+<li><p><code>BlockOnNonDurableSend</code>. If this is set to <code>true</code> then all calls to
+send for non-durable messages on non transacted sessions will block
+until the message has reached the server, and a response has been
+sent back. The default value is <code>false</code>.</p>
+</li>
+</ul>
+<p>Setting block on sends to <code>true</code> can reduce performance since each send
+requires a network round trip before the next send can be performed.
+This means the performance of sending messages will be limited by the
+network round trip time (RTT) of your network, rather than the bandwidth
+of your network. For better performance we recommend either batching
+many messages sends together in a transaction since with a transactional
+session, only the commit / rollback blocks not every send, or, using
+Apache ActiveMQ Artemis&apos;s advanced <em>asynchronous send acknowledgements feature</em>
+described in Asynchronous Send Acknowledgements.</p>
+<p>If you are using JMS and JNDI then using the elements
+<code>blockOnDurableSend</code> and <code>blockOnNonDurableSend</code>. If you&apos;re using
+JMS but not using JNDI then you can set these values directly on the
+<code>ActiveMQConnectionFactory</code> instance using the appropriate setter
+methods.</p>
+<p>If you&apos;re using core you can set these values directly on the
+<code>ClientSessionFactory</code> instance using the appropriate setter methods.</p>
+<p>When the server receives a message sent from a non transactional
+session, and that message is durable and the message is routed to at
+least one durable queue, then the server will persist the message in
+permanent storage. If the journal parameter
+<code>journal-sync-non-transactional</code> is set to <code>true</code> the server will not
+send a response back to the client until the message has been persisted
+and the server has a guarantee that the data has been persisted to disk.
+The default value for this parameter is <code>true</code>.</p>
+<h2 id="guarantees-of-non-transactional-acknowledgements">Guarantees of Non Transactional Acknowledgements</h2>
+<p>If you are acknowledging the delivery of a message at the client side
+using a non transacted session, Apache ActiveMQ Artemis can be configured to block the
+call to acknowledge until the acknowledge has definitely reached the
+server, and a response has been sent back to the client. This is
+configured with the parameter <code>BlockOnAcknowledge</code>. If this is set to
+<code>true</code> then all calls to acknowledge on non transacted sessions will
+block until the acknowledge has reached the server, and a response has
+been sent back. You might want to set this to <code>true</code> if you want to
+implement a strict <em>at most once</em> delivery policy. The default value is
+<code>false</code></p>
+<h2 id="asynchronous-send-acknowledgements">Asynchronous Send Acknowledgements</h2>
+<p>If you are using a non transacted session but want a guarantee that
+every message sent to the server has reached it, then, as discussed in
+Guarantees of Non Transactional Message Sends, you can configure Apache ActiveMQ Artemis to block the call to send until the server
+has received the message, persisted it and sent back a response. This
+works well but has a severe performance penalty - each call to send
+needs to block for at least the time of a network round trip (RTT) - the
+performance of sending is thus limited by the latency of the network,
+<em>not</em> limited by the network bandwidth.</p>
+<p>Let&apos;s do a little bit of maths to see how severe that is. We&apos;ll consider
+a standard 1Gib ethernet network with a network round trip between the
+server and the client of 0.25 ms.</p>
+<p>With a RTT of 0.25 ms, the client can send <em>at most</em> 1000/ 0.25 = 4000
+messages per second if it blocks on each message send.</p>
+<p>If each message is &lt; 1500 bytes and a standard 1500 bytes MTU (Maximum Transmission Unit) size is
+used on the network, then a 1GiB network has a <em>theoretical</em> upper limit
+of (1024 * 1024 * 1024 / 8) / 1500 = 89478 messages per second if
+messages are sent without blocking! These figures aren&apos;t an exact
+science but you can clearly see that being limited by network RTT can
+have serious effect on performance.</p>
+<p>To remedy this, Apache ActiveMQ Artemis provides an advanced new feature called
+<em>asynchronous send acknowledgements</em>. With this feature, Apache ActiveMQ Artemis can be
+configured to send messages without blocking in one direction and
+asynchronously getting acknowledgement from the server that the messages
+were received in a separate stream. By de-coupling the send from the
+acknowledgement of the send, the system is not limited by the network
+RTT, but is limited by the network bandwidth. Consequently better
+throughput can be achieved than is possible using a blocking approach,
+while at the same time having absolute guarantees that messages have
+successfully reached the server.</p>
+<p>The window size for send acknowledgements is determined by the
+confirmation-window-size parameter on the connection factory or client
+session factory. Please see <a href="client-reconnection.html">Client Reconnection and Session Reattachment</a> for more info on this.</p>
+<h1 id="asynchronous-send-acknowledgements">Asynchronous Send Acknowledgements</h1>
+<p>To use the feature using the core API, you implement the interface
+<code>org.apache.activemq.artemis.api.core.client.SendAcknowledgementHandler</code> and set
+a handler instance on your <code>ClientSession</code>.</p>
+<p>Then, you just send messages as normal using your <code>ClientSession</code>, and
+as messages reach the server, the server will send back an
+acknowledgement of the send asynchronously, and some time later you are
+informed at the client side by Apache ActiveMQ Artemis calling your handler&apos;s
+<code>sendAcknowledged(ClientMessage message)</code> method, passing in a reference
+to the message that was sent.</p>
+<p>To enable asynchronous send acknowledgements you must make sure
+<code>confirmationWindowSize</code> is set to a positive integer value, e.g.
+10MiB</p>
+<p>Please see <a href="examples.html">the examples chapter</a> for a full working example.</p>
+
+                                
+                                </section>
+                            
+    </div>
+    <div class="search-results">
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+
+    <script>
+        var gitbook = gitbook || [];
+        gitbook.push(function() {
+            gitbook.page.hasChanged({"page":{"title":"Guarantees of sends and commits","level":"1.23","depth":1,"next":{"title":"Message Redelivery and Undelivered Messages","level":"1.24","depth":1,"path":"undelivered-messages.md","ref":"undelivered-messages.md","articles":[]},"previous":{"title":"Flow Control","level":"1.22","depth":1,"path":"flow-control.md","ref":"flow-control.md","articles":[]},"dir":"ltr"},"config":{"plugins":[],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"highlight":{},"search":{},"lunr":{"maxIndexSize":1000000},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"fontsettings":{"theme":"white","family":"sans","size":2},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"style
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==============================================================================
--- websites/production/activemq/content/artemis/docs/1.5.4/slow-consumers.html (added)
+++ websites/production/activemq/content/artemis/docs/1.5.4/slow-consumers.html Sun Mar 12 16:08:18 2017
@@ -0,0 +1,1026 @@
+
+<!DOCTYPE HTML>
+<html lang="" >
+    <head>
+        <title>Detecting Slow Consumers · ActiveMQ Artemis Documentation</title>
+        <meta charset="UTF-8">
+        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
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+    
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+    
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+    
+        
+        
+    
+        <li class="chapter " data-level="1.1" data-path="./">
+            
+                <a href="./">
+            
+                    
+                    Introduction
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.2" data-path="notice.html">
+            
+                <a href="notice.html">
+            
+                    
+                    Legal Notice
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.3" data-path="preface.html">
+            
+                <a href="preface.html">
+            
+                    
+                    Preface
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.4" data-path="project-info.html">
+            
+                <a href="project-info.html">
+            
+                    
+                    Project Info
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.5" data-path="messaging-concepts.html">
+            
+                <a href="messaging-concepts.html">
+            
+                    
+                    Messaging Concepts
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.6" data-path="architecture.html">
+            
+                <a href="architecture.html">
+            
+                    
+                    Architecture
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.7" data-path="using-server.html">
+            
+                <a href="using-server.html">
+            
+                    
+                    Using the Server
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.8" data-path="using-jms.html">
+            
+                <a href="using-jms.html">
+            
+                    
+                    Using JMS
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.9" data-path="using-core.html">
+            
+                <a href="using-core.html">
+            
+                    
+                    Using Core
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.10" data-path="jms-core-mapping.html">
+            
+                <a href="jms-core-mapping.html">
+            
+                    
+                    Mapping JMS Concepts to the Core API
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.11" data-path="client-classpath.html">
+            
+                <a href="client-classpath.html">
+            
+                    
+                    The Client Classpath
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.12" data-path="examples.html">
+            
+                <a href="examples.html">
+            
+                    
+                    Examples
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.13" data-path="wildcard-routing.html">
+            
+                <a href="wildcard-routing.html">
+            
+                    
+                    Routing Messages With Wild Cards
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.14" data-path="wildcard-syntax.html">
+            
+                <a href="wildcard-syntax.html">
+            
+                    
+                    Understanding the Apache ActiveMQ Artemis Wildcard Syntax
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.15" data-path="filter-expressions.html">
+            
+                <a href="filter-expressions.html">
+            
+                    
+                    Filter Expressions
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.16" data-path="persistence.html">
+            
+                <a href="persistence.html">
+            
+                    
+                    Persistence
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.17" data-path="configuring-transports.html">
+            
+                <a href="configuring-transports.html">
+            
+                    
+                    Configuring Transports
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.18" data-path="config-reload.html">
+            
+                <a href="config-reload.html">
+            
+                    
+                    Configuration Reload
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.19" data-path="connection-ttl.html">
+            
+                <a href="connection-ttl.html">
+            
+                    
+                    Detecting Dead Connections
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter active" data-level="1.20" data-path="slow-consumers.html">
+            
+                <a href="slow-consumers.html">
+            
+                    
+                    Detecting Slow Consumers
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.21" data-path="transaction-config.html">
+            
+                <a href="transaction-config.html">
+            
+                    
+                    Resource Manager Configuration
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.22" data-path="flow-control.html">
+            
+                <a href="flow-control.html">
+            
+                    
+                    Flow Control
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.23" data-path="send-guarantees.html">
+            
+                <a href="send-guarantees.html">
+            
+                    
+                    Guarantees of sends and commits
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.24" data-path="undelivered-messages.html">
+            
+                <a href="undelivered-messages.html">
+            
+                    
+                    Message Redelivery and Undelivered Messages
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.25" data-path="message-expiry.html">
+            
+                <a href="message-expiry.html">
+            
+                    
+                    Message Expiry
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.26" data-path="large-messages.html">
+            
+                <a href="large-messages.html">
+            
+                    
+                    Large Messages
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.27" data-path="paging.html">
+            
+                <a href="paging.html">
+            
+                    
+                    Paging
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.28" data-path="queue-attributes.html">
+            
+                <a href="queue-attributes.html">
+            
+                    
+                    Queue Attributes
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.29" data-path="scheduled-messages.html">
+            
+                <a href="scheduled-messages.html">
+            
+                    
+                    Scheduled Messages
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.30" data-path="last-value-queues.html">
+            
+                <a href="last-value-queues.html">
+            
+                    
+                    Last-Value Queues
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.31" data-path="message-grouping.html">
+            
+                <a href="message-grouping.html">
+            
+                    
+                    Message Grouping
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.32" data-path="pre-acknowledge.html">
+            
+                <a href="pre-acknowledge.html">
+            
+                    
+                    Extra Acknowledge Modes
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.33" data-path="management.html">
+            
+                <a href="management.html">
+            
+                    
+                    Management
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.34" data-path="security.html">
+            
+                <a href="security.html">
+            
+                    
+                    Security
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.35" data-path="resource-limits.html">
+            
+                <a href="resource-limits.html">
+            
+                    
+                    Resource Limits
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.36" data-path="jms-bridge.html">
+            
+                <a href="jms-bridge.html">
+            
+                    
+                    The JMS Bridge
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.37" data-path="client-reconnection.html">
+            
+                <a href="client-reconnection.html">
+            
+                    
+                    Client Reconnection and Session Reattachment
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.38" data-path="diverts.html">
+            
+                <a href="diverts.html">
+            
+                    
+                    Diverting and Splitting Message Flows
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.39" data-path="core-bridges.html">
+            
+                <a href="core-bridges.html">
+            
+                    
+                    Core Bridges
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.40" data-path="duplicate-detection.html">
+            
+                <a href="duplicate-detection.html">
+            
+                    
+                    Duplicate Message Detection
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.41" data-path="clusters.html">
+            
+                <a href="clusters.html">
+            
+                    
+                    Clusters
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.42" data-path="ha.html">
+            
+                <a href="ha.html">
+            
+                    
+                    High Availability and Failover
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.43" data-path="graceful-shutdown.html">
+            
+                <a href="graceful-shutdown.html">
+            
+                    
+                    Graceful Server Shutdown
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.44" data-path="libaio.html">
+            
+                <a href="libaio.html">
+            
+                    
+                    Libaio Native Libraries
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.45" data-path="thread-pooling.html">
+            
+                <a href="thread-pooling.html">
+            
+                    
+                    Thread management
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.46" data-path="logging.html">
+            
+                <a href="logging.html">
+            
+                    
+                    Logging
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.47" data-path="rest.html">
+            
+                <a href="rest.html">
+            
+                    
+                    REST Interface
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="1.48" data-path="embedding-activemq.html">
+            
+                <a href="embedding-activemq.html">
+            
+                    
+                    Embedding Apache ActiveMQ Artemis
+            
+                </a>
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+        <a href="." >Detecting Slow Consumers</a>
+    </h1>
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+                                <h1 id="detecting-slow-consumers">Detecting Slow Consumers</h1>
+<p>In this section we will discuss how Apache ActiveMQ Artemis can be configured to deal
+with slow consumers. A slow consumer with a server-side queue (e.g. JMS
+topic subscriber) can pose a significant problem for broker performance.
+If messages build up in the consumer&apos;s server-side queue then memory
+will begin filling up and the broker may enter paging mode which would
+impact performance negatively. However, criteria can be set so that
+consumers which don&apos;t acknowledge messages quickly enough can
+potentially be disconnected from the broker which in the case of a
+non-durable JMS subscriber would allow the broker to remove the
+subscription and all of its messages freeing up valuable server
+resources.</p>
+<h2 id="configuration-required-for-detecting-slow-consumers">Configuration required for detecting slow consumers</h2>
+<p>By default the server will not detect slow consumers. If slow consumer
+detection is desired then see <a href="queue-attributes.html">queue attributes chapter</a>
+for more details.</p>
+<p>The calculation to determine whether or not a consumer is slow only
+inspects the number of messages a particular consumer has
+<em>acknowledged</em>. It doesn&apos;t take into account whether or not flow control
+has been enabled on the consumer, whether or not the consumer is
+streaming a large message, etc. Keep this in mind when configuring slow
+consumer detection.</p>
+<p>Please note that slow consumer checks are performed using the scheduled
+thread pool and that each queue on the broker with slow consumer
+detection enabled will cause a new entry in the internal
+<code>java.util.concurrent.ScheduledThreadPoolExecutor</code> instance. If there
+are a high number of queues and the <code>slow-consumer-check-period</code> is
+relatively low then there may be delays in executing some of the checks.
+However, this will not impact the accuracy of the calculations used by
+the detection algorithm. See <a href="thread-pooling.html">thread pooling</a> for more details about this pool.</p>
+
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