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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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| 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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| <h1 id="restart-sequence">Restart Sequence</h1> |
| <p>Apache ActiveMQ Artemis ships with 2 architectures for providing HA features. |
| The master and slave brokers can be configured either using network replication |
| or using shared storage. This document will share restart sequences for the |
| brokers under various circumstances when the client applications are |
| connected to it.</p> |
| <h2 id="restarting-1-broker-at-a-time">Restarting 1 broker at a time</h2> |
| <p>When restarting the brokers one at a time at regular intervals, it is not |
| important to follow any sequence. We just need to make sure that atleast |
| 1 broker in the master/slave pair is live to take up the connections from |
| the client applications.</p> |
| <h4 id="note-on-restarting">Note on restarting</h4> |
| <blockquote> |
| <p>While restarting the brokers while the client applications are connected |
| kindly make sure that atleast one broker is always live to serve the connected |
| clients.</p> |
| </blockquote> |
| <h2 id="completely-shutting-down-the-brokers-and-starting">Completely shutting down the brokers and starting</h2> |
| <p>If there is situation that we need to completely shutdown the brokers and |
| start them again, please follow the following procedure:</p> |
| <ol> |
| <li>Shut down all the slave brokers.</li> |
| <li>Shut down all the master brokers.</li> |
| <li>Start all the master brokers.</li> |
| <li>Start all the slave brokers.</li> |
| </ol> |
| <p>This sequence is particularly important in case of network replication for |
| the following reasons: |
| If the master broker is shutdown first, the slave broker will come live and accept |
| all the client connections. Then when the slave broker is stopped, the clients will |
| remain connected to the last live connection i.e. slave. Now, when we start the slave |
| and master brokers, the clients will keep trying to connecting to the last connection |
| i.e. with slave and will never be able to connect until we restart the client applications. |
| To avoid the hassle of restarting of client applications, we must follow the sequence |
| as suggested above.</p> |
| <h2 id="split-brain-situation">Split-brain situation</h2> |
| <p>The following procedure helps the cluster to recover from the split-brain situation |
| and getting the client connections auto-reconnected to the cluster. |
| With this sequence, client applications do not need to be restarted in order to make |
| connection with the brokers.</p> |
| <p>During the split brain situation both the master and slave brokers are live and there is |
| no replication that is happening from the master broker to the slave.</p> |
| <p>In such situation, there can be some client applications that are connected to the master |
| broker and other connected to the slave broker. Now after we restart the brokers and the |
| the cluster is properly formed.</p> |
| <p>Here, the clients that were connected to the master broker during the split brain situation |
| are auto-connected to the cluster and start processing the messages. But the clients that got |
| connected to the slave broker are still trying to make connection with the broker. This happens |
| because the slave broker has restarted in 'back up' mode.</p> |
| <p>Thus, not all the clients get connected to the brokers and function properly.</p> |
| <p>To avoid such mishap, kindly follow the below sequence:</p> |
| <ol> |
| <li>Stop the slave broker</li> |
| <li>Start the slave broker. Observe the logs for the message "Waiting for the master"</li> |
| <li>Stop the master broker.</li> |
| <li>Start the master broker. |
| Observe the master broker logs for "Server is live" |
| Observe the slave broker logs for "backup announced"</li> |
| <li>Stop the master broker again. Wait until the slave broker becomes live. Observe that all the |
| clients are connected to the slave broker.</li> |
| <li>Start the master broker. This time, all the connections will be switched to master broker again,</li> |
| </ol> |
| <h4 id="note-on-delta-message-loss-on-the-slave-broker">Note on delta message loss on the slave broker</h4> |
| <blockquote> |
| <p>During the split brain situation, messages are produced on the slave broker since it is live. |
| While resolving the split brain situation, if there are some delta messages that are not produced |
| on the slave broker. Those messages cannot be auto-recovered. There will be manual intervention |
| required to retrieve the messages, sometime it is almost impossible to recover the messages. |
| The above mentioned sequence helps in forming the cluster that was broken due to split brain |
| and getting all the client applications to auto connected to the cluster without any need for |
| client applications to be restarted. </p> |
| </blockquote> |
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