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| Client Reconnection and Session Reattachment |
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| Transformers |
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| Duplicate Message Detection |
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| Clusters |
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| Federation |
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| Address Federation |
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| Queue Federation |
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| High Availability and Failover |
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| Graceful Server Shutdown |
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| Libaio Native Libraries |
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| Thread management |
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| Embedded Web Server |
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| Logging |
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| REST Interface |
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| Embedding the Broker |
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| Apache Karaf |
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| Apache Tomcat |
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| Spring Integration |
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| CDI Integration |
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| Intercepting Operations |
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| Data Tools |
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| <a href="." >Client Reconnection and Session Reattachment</a> |
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| <h1 id="client-reconnection-and-session-reattachment">Client Reconnection and Session Reattachment</h1> |
| <p>Apache ActiveMQ Artemis clients can be configured to automatically reconnect or |
| re-attach to the server in the event that a failure is detected in the |
| connection between the client and the server.</p> |
| <h2 id="100-transparent-session-re-attachment">100% Transparent session re-attachment</h2> |
| <p>If the failure was due to some transient failure such as a temporary network |
| failure, and the target server was not restarted, then the sessions will still |
| be existent 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, Apache ActiveMQ Artemis will automatically re-attach the |
| client sessions to the server sessions when the connection reconnects. 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="session-reconnection">Session reconnection</h2> |
| <p>Alternatively, the server might have actually been restarted after crashing or |
| being stopped. In this case any sessions will no longer be existent on the |
| server and it won't be possible to 100% transparently re-attach to them.</p> |
| <p>In this case, Apache ActiveMQ Artemis will automatically reconnect the |
| connection and <em>recreate</em> any sessions and consumers on the server |
| corresponding to the sessions and consumers on the client. This process is |
| exactly the same as what happens during failover onto a backup 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> |
| <p>Please see the section on failover <a href="ha.html">Automatic Client Failover</a> to get a |
| full understanding of how transacted and non-transacted sessions are |
| reconnected during failover/reconnect and what you need to do to maintain <em>once |
| and only once</em> delivery guarantees.</p> |
| <h2 id="configuring-reconnectionreattachment-attributes">Configuring reconnection/reattachment attributes</h2> |
| <p>Client reconnection 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 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>reconnectAttempts</code>. This optional parameter determines the total number of |
| reconnect attempts to make 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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