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| AMQP |
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| Broker Connections |
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| MQTT |
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| Core |
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| Mapping JMS Concepts to the Core API |
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| Using JMS |
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| The Client Classpath |
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| JMS |
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| Jakarta |
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| Examples |
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| Routing Messages With Wild Cards |
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| Wildcard Syntax |
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| Filter Expressions |
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| Persistence |
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| Configuring Transports |
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| Configuration Reload |
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| <li class="chapter " data-level="1.27" data-path="connection-ttl.html"> |
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| Detecting Dead Connections |
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| Detecting Slow Consumers |
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| Avoiding Network Isolation |
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| Detecting Broker Issues (Critical Analysis) |
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| </a> |
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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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| </a> |
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| Message Expiry |
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| </a> |
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| <li class="chapter " data-level="1.36" data-path="large-messages.html"> |
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| <a href="large-messages.html"> |
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| Large Messages |
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| </a> |
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| <a href="paging.html"> |
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| Paging |
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| <a href="scheduled-messages.html"> |
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| Scheduled Messages |
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| </a> |
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| <li class="chapter " data-level="1.39" data-path="last-value-queues.html"> |
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| <a href="last-value-queues.html"> |
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| Last-Value Queues |
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| </a> |
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| <li class="chapter " data-level="1.40" data-path="non-destructive-queues.html"> |
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| <a href="non-destructive-queues.html"> |
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| Non-Destructive Queues |
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| </a> |
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| <li class="chapter " data-level="1.41" data-path="ring-queues.html"> |
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| <a href="ring-queues.html"> |
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| Ring Queues |
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| </a> |
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| <li class="chapter " data-level="1.42" data-path="retroactive-addresses.html"> |
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| <a href="retroactive-addresses.html"> |
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| Retroactive Addresses |
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| </a> |
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| <li class="chapter " data-level="1.43" data-path="exclusive-queues.html"> |
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| <a href="exclusive-queues.html"> |
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| Exclusive Queues |
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| </a> |
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| <li class="chapter " data-level="1.44" data-path="message-grouping.html"> |
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| <a href="message-grouping.html"> |
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| Message Grouping |
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| </a> |
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| <li class="chapter " data-level="1.45" data-path="consumer-priority.html"> |
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| <a href="consumer-priority.html"> |
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| Consumer Priority |
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| </a> |
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| <li class="chapter " data-level="1.46" data-path="pre-acknowledge.html"> |
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| <a href="pre-acknowledge.html"> |
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| Extra Acknowledge Modes |
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| </a> |
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| <li class="chapter " data-level="1.47" data-path="management.html"> |
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| <a href="management.html"> |
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| Management |
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| </a> |
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| <li class="chapter " data-level="1.48" data-path="management-console.html"> |
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| <a href="management-console.html"> |
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| Management Console |
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| </a> |
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| <li class="chapter " data-level="1.49" data-path="metrics.html"> |
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| <a href="metrics.html"> |
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| Metrics |
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| </a> |
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| <li class="chapter " data-level="1.50" data-path="security.html"> |
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| <a href="security.html"> |
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| Security |
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| </a> |
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| <li class="chapter " data-level="1.51" data-path="masking-passwords.html"> |
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| <a href="masking-passwords.html"> |
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| Masking Passwords |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.52" data-path="broker-plugins.html"> |
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| <a href="broker-plugins.html"> |
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| Broker Plugins |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.53" data-path="resource-limits.html"> |
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| <a href="resource-limits.html"> |
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| Resource Limits |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.54" data-path="jms-bridge.html"> |
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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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| </li> |
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| <li class="chapter active" data-level="1.55" data-path="client-failover.html"> |
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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> |
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| <li class="chapter " data-level="1.56" data-path="diverts.html"> |
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| <a href="diverts.html"> |
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| Diverting and Splitting Message Flows |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.57" data-path="core-bridges.html"> |
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| <a href="core-bridges.html"> |
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| Core Bridges |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.58" data-path="transformers.html"> |
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| <a href="transformers.html"> |
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| Transformers |
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| </a> |
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| </li> |
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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> |
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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> |
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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> |
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| <ul class="articles"> |
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| <li class="chapter " data-level="1.61.1" data-path="federation-address.html"> |
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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> |
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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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| </li> |
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| </ul> |
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| </li> |
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| <li class="chapter " data-level="1.62" data-path="ha.html"> |
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| <a href="ha.html"> |
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| High Availability and Failover |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.63" data-path="connection-routers.html"> |
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| <a href="connection-routers.html"> |
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| Connection Routers |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.64" data-path="graceful-shutdown.html"> |
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| <a href="graceful-shutdown.html"> |
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| Graceful Server Shutdown |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.65" 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="1.66" 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> |
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| <li class="chapter " data-level="1.67" 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> |
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| <li class="chapter " data-level="1.68" data-path="logging.html"> |
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| <a href="logging.html"> |
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| Logging |
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| </a> |
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| </li> |
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| <li class="chapter " data-level="1.69" data-path="embedding-activemq.html"> |
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| <a href="." >Client Failover</a> |
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| <h1 id="client-failover">Client Failover</h1> |
| <p>Apache ActiveMQ Artemis clients can be configured to automatically |
| <a href="#reconnect-to-the-same-server">reconnect to the same server</a>, |
| <a href="#reconnect-to-the-backup-server">reconnect to the backup server</a> or |
| <a href="#reconnect-to-other-live-servers">reconnect to other live servers</a> in the event |
| that a failure is detected in the connection between the client and the server. |
| The clients detect connection failure when they have not received any packets |
| from the server within the time given by <code>client-failure-check-period</code> as explained |
| in section <a href="connection-ttl.html">Detecting Dead Connections</a>.</p> |
| <h2 id="reconnect-to-the-same-server">Reconnect to the same server</h2> |
| <p>Set <code>reconnectAttempts</code> to any non-zero value to reconnect to the same server, |
| for further details see |
| <a href="#client-failover-attributes">Reconnection and failover attributes</a>.</p> |
| <p>If the disconnection was due to some transient failure such as a temporary |
| network outage and the target server was not restarted, then the sessions will |
| still exist on the server, assuming the client hasn't been disconnected for |
| more than <a href="connection-ttl.html">connection-ttl</a></p> |
| <p>In this scenario, the client sessions will be automatically re-attached to the |
| server sessions after the reconnection. This is done 100% transparently and the |
| client can continue exactly as if nothing had happened.</p> |
| <p>The way this works is as follows:</p> |
| <p>As Apache ActiveMQ Artemis clients send commands to their servers they store |
| each sent command in an in-memory buffer. In the case that connection failure |
| occurs and the client subsequently reattaches to the same server, as part of |
| the reattachment protocol the server informs the client during reattachment |
| with the id of the last command it successfully received from that client.</p> |
| <p>If the client has sent more commands than were received before failover it can |
| replay any sent commands from its buffer so that the client and server can |
| reconcile their states.Ac</p> |
| <p>The size of this buffer is configured with the <code>confirmationWindowSize</code> |
| parameter on the connection URL. When the server has received |
| <code>confirmationWindowSize</code> bytes of commands and processed them it will send back |
| a command confirmation to the client, and the client can then free up space in |
| the buffer.</p> |
| <p>The window is specified in bytes.</p> |
| <p>Setting this parameter to <code>-1</code> disables any buffering and prevents any |
| re-attachment from occurring, forcing reconnect instead. The default value for |
| this parameter is <code>-1</code>. (Which means by default no auto re-attachment will |
| occur)</p> |
| <h2 id="reconnect-to-the-backup-server">Reconnect to the backup server</h2> |
| <p>Set <code>reconnectAttempts</code> to any non-zero value and <code>ha</code> to <code>true</code> to reconnect |
| to the back server, for further details see |
| <a href="#client-failover-attributes">Reconnection and failover attributes</a>.</p> |
| <p>The clients can be configured to discover the list of live-backup |
| server groups in a number of different ways. They can be configured |
| explicitly or probably the most common way of doing this is to use |
| <em>server discovery</em> for the client to automatically discover the list. |
| For full details on how to configure server discovery, please see <a href="clusters.html">Clusters</a>. |
| Alternatively, the clients can explicitly connect to a specific server |
| and download the current servers and backups see <a href="clusters.html">Clusters</a>.</p> |
| <p>By default, failover will only occur after at least one connection has |
| been made to the live server. In other words, by default, failover will |
| not occur if the client fails to make an initial connection to the live |
| server - in this case it will simply retry connecting to the live server |
| according to the reconnect-attempts property and fail after this number |
| of attempts.</p> |
| <h2 id="reconnect-to-other-live-servers">Reconnect to other live servers</h2> |
| <p>Set <code>failoverAttempts</code> to any non-zero value to reconnect to other live servers, |
| for further details see |
| <a href="#client-failover-attributes">Reconnection and failover attributes</a>.</p> |
| <p>If <code>reconnectAttempts</code> value is not zero then the client will try to reconnect |
| to other live servers only after all attempts to |
| <a href="#reconnect-to-the-same-server">reconnect to the same server</a> or |
| <a href="#reconnect-to-the-backup-server">reconnect to the backup server</a> fail.</p> |
| <h2 id="session-reconnection">Session reconnection</h2> |
| <p>When clients <a href="#reconnect-to-the-same-server">reconnect to the same server</a> |
| after a restart, <a href="#reconnect-to-the-backup-server">reconnect to the backup server</a> |
| or <a href="#reconnect-to-other-live-servers">reconnect to other live servers</a> any sessions |
| will no longer exist on the server and it won't be possible to 100% transparently |
| re-attach to them. In this case, any sessions and consumers on the client will be |
| automatically recreated on the server.</p> |
| <p>Client reconnection is also used internally by components such as core bridges |
| to allow them to reconnect to their target servers.</p> |
| <h2 id="failing-over-on-the-initial-connection">Failing over on the initial connection</h2> |
| <p>Since the client does not learn about the full topology until after the |
| first connection is made there is a window where it does not know about |
| the backup. If a failure happens at this point the client can only try |
| reconnecting to the original live server. To configure how many attempts |
| the client will make you can set the URL parameter <code>initialConnectAttempts</code>. |
| The default for this is <code>0</code>, that is try only once. Once the number of |
| attempts has been made an exception will be thrown.</p> |
| <p>For examples of automatic failover with transacted and non-transacted |
| JMS sessions, please see <a href="examples.html">the examples</a> chapter.</p> |
| <h2 id="reconnection-and-failover-attributes">Reconnection and failover attributes</h2> |
| <p>Client reconnection and failover is configured using the following parameters:</p> |
| <ul> |
| <li><p><code>retryInterval</code>. This optional parameter determines the period in |
| milliseconds between subsequent reconnection attempts, if the connection to |
| the target server has failed. The default value is <code>2000</code> milliseconds.</p> |
| </li> |
| <li><p><code>retryIntervalMultiplier</code>. This optional parameter determines a multiplier |
| to apply to the time since the last retry to compute the time to the next |
| retry.</p> |
| <p>This allows you to implement an <em>exponential backoff</em> between retry attempts.</p> |
| <p>Let's take an example:</p> |
| <p>If we set <code>retryInterval</code> to <code>1000</code> ms and we set <code>retryIntervalMultiplier</code> |
| to <code>2.0</code>, then, if the first reconnect attempt fails, we will wait <code>1000</code> ms |
| then <code>2000</code> ms then <code>4000</code> ms between subsequent reconnection attempts.</p> |
| <p>The default value is <code>1.0</code> meaning each reconnect attempt is spaced at equal |
| intervals.</p> |
| </li> |
| <li><p><code>maxRetryInterval</code>. This optional parameter determines the maximum retry |
| interval that will be used. When setting <code>retryIntervalMultiplier</code> it would |
| otherwise be possible that subsequent retries exponentially increase to |
| ridiculously large values. By setting this parameter you can set an upper limit |
| on that value. The default value is <code>2000</code> milliseconds.</p> |
| </li> |
| <li><p><code>ha</code>. This optional parameter determines weather the client will try to |
| reconnect to the backup node when the live node is not reachable. |
| The default value is <code>false</code>. |
| For more information on HA, please see <a href="ha.html">High Availability and Failover</a>.</p> |
| </li> |
| <li><p><code>reconnectAttempts</code>. This optional parameter determines the total number of |
| reconnect attempts to make to the current live/backup pair before giving up. |
| A value of <code>-1</code> signifies an unlimited number of attempts. |
| The default value is <code>0</code>.</p> |
| </li> |
| <li><p><code>failoverAttempts</code>. This optional parameter determines the total number of |
| failover attempts to make after a reconnection failure before giving up and |
| shutting down. A value of <code>-1</code> signifies an unlimited number of attempts. |
| The default value is <code>0</code>.</p> |
| </li> |
| </ul> |
| <p>All of these parameters are set on the URL used to connect to the broker.</p> |
| <p>If your client does manage to reconnect but the session is no longer available |
| on the server, for instance if the server has been restarted or it has timed |
| out, then the client won't be able to re-attach, and any <code>ExceptionListener</code> or |
| <code>FailureListener</code> instances registered on the connection or session will be |
| called.</p> |
| <h2 id="exceptionlisteners-and-sessionfailurelisteners">ExceptionListeners and SessionFailureListeners</h2> |
| <p>Please note, that when a client reconnects or re-attaches, any registered JMS |
| <code>ExceptionListener</code> or core API <code>SessionFailureListener</code> will be called.</p> |
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