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| <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">7.3. Virtualhost Nodes</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Management-Managing-Broker.html">Prev</a> </td><th align="center" width="60%">Chapter 7. Managing Entities</th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-Management-Managing-Virtualhosts.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-Management-Managing-Virtualhost-Nodes"></a>7.3. Virtualhost Nodes</h2></div></div></div><p>Virtualhost nodes can only be managed by the HTTP management channel.</p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Management-Managing-Virtualhost-Nodes-Types"></a>7.3.1. Types</h3></div></div></div><p> The following virtualhost nodes types are supported. </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>BDB - Node backed with Oracle Berkeley DB JE</p></li><li class="listitem"><p>BDB HA - Node backed with Oracle Berkeley DB JE utilising High Availability</p></li><li class="listitem"><p>DERBY - Node backed with Apache Derby</p></li><li class="listitem"><p>JDBC - Node backed with an external database <a class="footnote" href="#ftn.d0e3029" id="d0e3029"><sup class="footnote">[5]</sup></a></p></li><li class="listitem"><p>JSON - Node backed with a file containing json</p></li><li class="listitem"><p>Memory - In-memory node (changes lost on Broker restart)</p></li></ul></div><p> |
| </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Management-Managing-Virtualhost-Nodes-Attributes"></a>7.3.2. Attributes</h3></div></div></div><p> |
| </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p><span class="emphasis"><em>Name the virtualhost node</em></span>.</p></li><li class="listitem"><p><span class="emphasis"><em>Default Virtual Host Node</em></span>. If true, messaging clients which do |
| not specify a virtualhost name will be connected to the virtualhost beneath this node.</p></li><li class="listitem"><p><span class="emphasis"><em>Store Path or JDBC URL.</em></span> Refers the location used to store the |
| configuration of the virtualhost.</p></li><li class="listitem"><p><span class="emphasis"><em>Role</em></span> (HA only). The role that this node is currently playing in |
| the group. </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; "><li class="listitem"><p>MASTER - Virtualhost node is a master.</p></li><li class="listitem"><p>REPLICA - Virtualhost node is a replica.</p></li><li class="listitem"><p>WAITING - Virtualhost node is awaiting an election result, or may be awaiting |
| more nodes to join in order that an election may be held.</p></li><li class="listitem"><p>DETACHED - Virtualhost node is disconnected from the group.</p></li></ul></div></li><li class="listitem"><p><span class="emphasis"><em>Priority</em></span> (HA only). The priority of this node when elections |
| occurs. The attribute can be used to make it more likely for a node to be elected than |
| other nodes, or disallow the node from never being elected at all. See <a class="xref" href="Java-Broker-High-Availability-Behaviour.html#Java-Broker-High-Availability-Behaviour-NodePriority" title="10.4.3. Node Priority">Section 10.4.3, “Node Priority”</a></p></li><li class="listitem"><p><span class="emphasis"><em>Minimum Number Of Nodes</em></span> (HA only - groups of three or more). |
| Allows the number of nodes required to hold an election to be reduced in order that |
| service can be restore when less than quorum nodes are present. See <a class="xref" href="Java-Broker-High-Availability-Behaviour.html#Java-Broker-High-Availability-Behaviour-MinimumNumberOfNodes" title="10.4.4. Required Minimum Number Of Nodes">Section 10.4.4, “Required Minimum Number Of Nodes”</a></p></li><li class="listitem"><p><span class="emphasis"><em>Allow this node to operate solo</em></span> (HA only - groups of two). Allows a single |
| node in a two node group to operate solo. See <a class="xref" href="Java-Broker-High-Availability-Behaviour.html#Java-Broker-High-Availability-Behaviour-DesignatedPrimary" title="10.4.5. Allow to Operate Solo">Section 10.4.5, “Allow to Operate Solo”</a></p></li></ul></div><p> |
| </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Management-Managing-Virtualhost-Node-Children"></a>7.3.3. Children</h3></div></div></div><p> |
| </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> |
| <a class="link" href="Java-Broker-Management-Managing-Virtualhosts.html" title="7.4. VirtualHosts">Virtualhost</a> |
| </p></li><li class="listitem"><p> |
| <a class="link" href="Java-Broker-Management-Managing-RemoteReplicationNodes.html" title="7.5. Remote Replication Nodes">Remote |
| Replication Nodes</a> |
| </p></li></ul></div><p> |
| </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Management-Managing-Virtualhost-Node-Lifecycle"></a>7.3.4. Lifecycle</h3></div></div></div><p> |
| </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p><span class="emphasis"><em>Stop</em></span>. Stops the virtualhost node. This closes any existing |
| messaging connections to the virtualhost and prevents new ones. Any inflight |
| transactions are rolled back. Non durable queues and exchanges are lost. Transient |
| messages or persistent messages on non-durable queues are lost.</p><p>When HA is in use, stopping the virtualhost node stops the virtualhost node from |
| participating in the group. If the node was in the master role, the remaining nodes will |
| try to conduct an election and elect a new master. If the node was in the replica role, |
| the node will cease to keep up to date with later transactions. A stopped node does not |
| vote in elections. Other nodes in the group will report the stopped node as |
| unreachable.</p></li><li class="listitem"><p><span class="emphasis"><em>Start</em></span>. Activates the virtualhost node.</p></li><li class="listitem"><p><span class="emphasis"><em>Delete</em></span>. Deletes the virtualhost node and the virtualhost |
| contained within it. All exchanges and queues, any the messages contained within it are |
| removed. In the HA case, deleting the virtualhost node causes it be removed permanently |
| from the group.</p></li></ul></div><p> |
| </p></div><div class="footnotes"><br /><hr style="width:100; text-align:left;margin-left: 0" /><div class="footnote" id="ftn.d0e3029"><p><a class="para" href="#d0e3029"><sup class="para">[5] </sup></a>JDBC 4.0 compatible drivers must be available. See <a class="xref" href="Java-Broker-Miscellaneous-Installing-External-JDBC-Driver.html" title="F.2. Installing External JDBC Driver">Section F.2, “Installing External JDBC Driver”</a></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-Management-Managing-Broker.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-Management-Managing-Entities.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-Management-Managing-Virtualhosts.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">7.2. Broker </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%"> 7.4. VirtualHosts</td></tr></table></div></div> |
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