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| Message Expiry |
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| Large Messages |
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| Scheduled Messages |
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| Last-Value Queues |
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| Non-Destructive 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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| <a href="resource-limits.html"> |
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| Resource Limits |
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| <a href="jms-bridge.html"> |
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| The JMS Bridge |
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| </a> |
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| <a href="client-failover.html"> |
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| Client Failover |
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| </a> |
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| <li class="chapter " data-level="1.56" data-path="diverts.html"> |
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| Diverting and Splitting Message Flows |
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| </a> |
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| Core Bridges |
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| <a href="transformers.html"> |
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| Transformers |
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| <li class="chapter " data-level="1.59" data-path="duplicate-detection.html"> |
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| <a href="duplicate-detection.html"> |
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| Duplicate Message Detection |
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| </a> |
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| <li class="chapter " data-level="1.60" data-path="clusters.html"> |
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| <a href="clusters.html"> |
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| Clusters |
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| </a> |
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| <li class="chapter " data-level="1.61" data-path="federation.html"> |
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| <a href="federation.html"> |
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| Federation |
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| <a href="federation-address.html"> |
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| Address Federation |
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| </a> |
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| <li class="chapter " data-level="1.61.2" data-path="federation-queue.html"> |
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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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| <a href="connection-routers.html"> |
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| Connection Routers |
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| Graceful Server Shutdown |
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| </a> |
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| Libaio Native Libraries |
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| </a> |
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| <li class="chapter " data-level="1.66" data-path="thread-pooling.html"> |
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| Thread management |
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| Embedded Web Server |
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| <a href="logging.html"> |
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| Logging |
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| <a href="." >Guarantees of sends and commits</a> |
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| <h1 id="guarantees-of-sends-and-commits">Guarantees of Sends and Commits</h1> |
| <h2 id="transaction-completion">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="non-transactional-message-sends">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 URL 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's advanced <em>asynchronous send acknowledgements feature</em> |
| described in Asynchronous Send Acknowledgements.</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="non-transactional-acknowledgements">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's do a little bit of maths to see how severe that is. We'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 < 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'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-failover.html">Client Failover</a> for more info on this.</p> |
| <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'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> |
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