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| <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">10.2. High Availability Overview</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-High-Availability.html">Prev</a> </td><th align="center" width="60%">Chapter 10. High Availability</th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-High-Availability-CreatingGroup.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="Java-Broker-High-Availability-OverviewOfHA"></a>10.2. High Availability Overview</h2></div></div></div><p>The Broker provides a HA implementation offering an <span class="bold"><strong>Active/Passive</strong></span> mode of operation. |
| When using HA, many instances of the Broker work together to form an high availability group of two or more nodes.</p><p>The remainder of this section now talks about the specifics of how HA is achieved in terms |
| of the <a class="link" href="Java-Broker-Concepts.html" title="Chapter 4. Concepts">concepts</a> introduced earlier in this |
| book.</p><p>The <a class="link" href="Java-Broker-Concepts-Virtualhosts.html" title="4.5. Virtualhosts">Virtualhost</a> is the unit of |
| replication. This means that any <span class="emphasis"><em>durable</em></span> queues, exchanges, and bindings |
| belonging to that virtualhost, any <span class="emphasis"><em>persistent</em></span> messages contained within |
| the queues and any attribute settings applied to the virtualhost itself are automatically |
| replicated to all nodes within the group.<a class="footnote" href="#ftn.d0e6726" id="d0e6726"><sup class="footnote">[14]</sup></a></p><p>It is the <a class="link" href="Java-Broker-Concepts-Virtualhost-Nodes.html" title="4.3. Virtualhost Nodes">Virtualhost Nodes</a> |
| (from different Broker instances) that join together to form a group. The virtualhost nodes |
| collectively to coordinate the group: they organise replication between the master and |
| replicas and conduct elections to determine who becomes the new master in the event of the old |
| failing.</p><p>When a virtualhost node is in the <span class="emphasis"><em>master</em></span> role, the virtualhost |
| beneath it is available for messaging work. Any write operations sent to the virtualhost are |
| automatically replicated to all other nodes in group.</p><p>When a virtualhost node is in the <span class="emphasis"><em>replica</em></span> role, the virtualhost |
| beneath it is always unavailable for message work. Any attempted connections to a virtualhost |
| in this state are automatically turned away, allowing a messaging client to discover where the |
| master currently resides. When in replica role, the node sole responsibility is to consume a |
| replication stream in order that it remains up to date with the master.</p><p>Messaging clients discover the active virtualhost.This can be achieved using a static |
| technique (for instance, a failover url (a feature of a Apache Qpid JMS Client for AMQP 0-9-1/0-10)), or a dynamic one |
| utilising some kind of proxy or virtual IP (VIP).</p><p>The figure that follows illustrates a group formed of three virtualhost nodes from three |
| separate Broker instances. A client is connected to the virtualhost node that is in the master |
| role. The two virtualhost nodes <code class="literal">weather1</code> and <code class="literal">weather3</code> |
| are replicas and are receiving a stream of updates.</p><div class="figure"><a id="Java-Broker-High-Availability-OverviewOfHA-Figure"></a><p class="title"><strong>Figure 10.1. 3-node group deployed across three Brokers.</strong></p><div class="figure-contents"><div class="mediaobject"><img alt="Diagram showing a 3 node group deployed across three Brokers" src="images/HA-Overview.png" /></div></div></div><br class="figure-break" /><p>Currently, the only virtualhost/virtualhost node type offering HA is BDB HA. Internally, |
| this leverages the HA capabilities of the Berkeley DB JE edition. BDB JE is an <a class="link" href="Java-Broker-Miscellaneous-Installing-Oracle-BDB-JE.html" title="E.3. Installing Oracle BDB JE">optional dependency</a> of |
| the Broker.</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>The HA solution from the Apache Qpid Broker for Java is incompatible with the HA solution offered by the CPP |
| Broker. It is not possible to co-locate Broker for Java and CPP Brokers within the same group.</p></div><div class="footnotes"><br /><hr style="width:100; text-align:left;margin-left: 0" /><div class="footnote" id="ftn.d0e6726"><p><a class="para" href="#d0e6726"><sup class="para">[14] </sup></a>Transient messages and messages on non-durable queues are not replicated.</p></div></div></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-High-Availability.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-High-Availability-CreatingGroup.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">Chapter 10. High Availability </td><td align="center" width="20%"><a accesskey="h" href="AMQP-Messaging-Broker-Java-Book.html">Home</a></td><td align="right" valign="top" width="40%"> 10.3. Creating a group</td></tr></table></div></div> |
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