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| <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">Chapter 10. High Availability</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Runtime-Memory.html">Prev</a> </td><th align="center" width="60%"> </th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-High-Availability-OverviewOfHA.html">Next</a></td></tr></table><hr /></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a id="Java-Broker-High-Availability"></a>Chapter 10. High Availability</h1></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="section"><a href="Java-Broker-High-Availability.html#Java-Broker-High-Availability-GeneralIntroduction">10.1. General Introduction</a></span></dt><dt><span class="section"><a href="Java-Broker-High-Availability-OverviewOfHA.html">10.2. High Availability Overview</a></span></dt><dt><span class="section"><a href="Java-Broker-High-Availability-CreatingGroup.html">10.3. Creating a group</a></span></dt><dt><span class="section"><a href="Java-Broker-High-Availability-Behaviour.html">10.4. Behaviour of the Group</a></span></dt><dd><dl><dt><span class="section"><a href="Java-Broker-High-Availability-Behaviour.html#Java-Broker-High-Availability-Behaviour-Default-Behaviour">10.4.1. Default Behaviour</a></span></dt><dt><span class="section"><a href="Java-Broker-High-Availability-Behaviour.html#Java-Broker-High-Availability-Behaviour-SynchronizationPolicy">10.4.2. Synchronization Policy</a></span></dt><dt><span class="section"><a href="Java-Broker-High-Availability-Behaviour.html#Java-Broker-High-Availability-Behaviour-NodePriority">10.4.3. Node Priority</a></span></dt><dt><span class="section"><a href="Java-Broker-High-Availability-Behaviour.html#Java-Broker-High-Availability-Behaviour-MinimumNumberOfNodes">10.4.4. Required Minimum Number Of Nodes</a></span></dt><dt><span class="section"><a href="Java-Broker-High-Availability-Behaviour.html#Java-Broker-High-Availability-Behaviour-DesignatedPrimary">10.4.5. Allow to Operate Solo</a></span></dt><dt><span class="section"><a href="Java-Broker-High-Availability-Behaviour.html#Java-Broker-High-Availability-Behaviour-MaximumMessageSize">10.4.6. Maximum message size</a></span></dt></dl></dd><dt><span class="section"><a href="Java-Broker-High-Availability-NodeOperations.html">10.5. Node Operations</a></span></dt><dd><dl><dt><span class="section"><a href="Java-Broker-High-Availability-NodeOperations.html#Java-Broker-High-Availability-NodeOperations-Lifecycle">10.5.1. Lifecycle</a></span></dt><dt><span class="section"><a href="Java-Broker-High-Availability-NodeOperations.html#Java-Broker-High-Availability-NodeOperations-TransferMaster">10.5.2. Transfer Master</a></span></dt></dl></dd><dt><span class="section"><a href="Java-Broker-High-Availability-ClientFailover.html">10.6. Client failover</a></span></dt><dt><span class="section"><a href="Java-Broker-High-Availability-DiskSpace.html">10.7. Disk space requirements</a></span></dt><dt><span class="section"><a href="Java-Broker-High-Availability-Network-Requirements.html">10.8. Network Requirements</a></span></dt><dt><span class="section"><a href="Java-Broker-High-Availability-Security.html">10.9. Security</a></span></dt><dt><span class="section"><a href="Java-Broker-High-Availability-Backup.html">10.10. Backups</a></span></dt><dt><span class="section"><a href="Java-Broker-High-Availability-Reset-Group-Infomational.html">10.11. Reset Group Information</a></span></dt></dl></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="Java-Broker-High-Availability-GeneralIntroduction"></a>10.1. General Introduction</h2></div></div></div><p>The term High Availability (HA) usually refers to having a number of instances of a |
| service such as a Message Broker available so that should a service unexpectedly fail, or |
| requires to be shutdown for maintenance, users may quickly connect to another instance and |
| continue their work with minimal interruption. HA is one way to make a overall system more |
| resilient by eliminating a single point of failure from a system.</p><p>HA offerings are usually categorised as <span class="bold"><strong>Active/Active</strong></span> or |
| <span class="bold"><strong>Active/Passive</strong></span>. An Active/Active system is one where all |
| nodes within the group are usually available for use by clients all of the time. In an |
| Active/Passive system, one only node within the group is available for use by clients at any |
| one time, whilst the others are in some kind of standby state, awaiting to quickly step-in in |
| the event the active node becomes unavailable. </p></div></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Runtime-Memory.html">Prev</a> </td><td align="center" width="20%"> </td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-High-Availability-OverviewOfHA.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">9.11. Memory </td><td align="center" width="20%"><a accesskey="h" href="Apache-Qpid-Broker-J-Book.html">Home</a></td><td align="right" valign="top" width="40%"> 10.2. High Availability Overview</td></tr></table></div></div> |
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