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Subject svn commit: r1413422 [10/19] - in /qpid/site/docs/books/0.20: ./ AMQP-Messaging-Broker-CPP-Book/ AMQP-Messaging-Broker-CPP-Book/html/ AMQP-Messaging-Broker-CPP-Book/html/css/ AMQP-Messaging-Broker-CPP-Book/html/images/ AMQP-Messaging-Broker-CPP-Book/pd...
Date Sun, 25 Nov 2012 21:12:32 GMT
Added: qpid/site/docs/books/0.20/AMQP-Messaging-Broker-Java-Book/html/Java-Broker-High-Availability-DurabilityGuarantee.html
URL: http://svn.apache.org/viewvc/qpid/site/docs/books/0.20/AMQP-Messaging-Broker-Java-Book/html/Java-Broker-High-Availability-DurabilityGuarantee.html?rev=1413422&view=auto
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+<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>12.6. Durability Guarantees</title><link rel="stylesheet" href="css/style.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="AMQP Messaging Broker (Java)"><link rel="up" href="Java-Broker-High-Availability.html" title="Chapter 12. High Availability"><link rel="prev" href="Java-Broker-High-Availability-Configuration.html" title="12.5. Configuring a Virtual Host to be a node"><link rel="next" href="Java-Broker-High-Availability-ClientFailover.html" title="12.7. Client failover configuration"></head><body><div class="container" bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><DIV class="header"><DIV class="logo"><H1>Apache Qpid™</H1><H2>Open Source AMQP Messaging</H2></DIV></DIV><DIV class="menu_box"><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Apache 
 Qpid</H3><UL><LI><A href="http://qpid.apache.org/index.html">Home</A></LI><LI><A href="http://qpid.apache.org/download.html">Download</A></LI><LI><A href="http://qpid.apache.org/getting_started.html">Getting Started</A></LI><LI><A href="http://www.apache.org/licenses/">License</A></LI><LI><A href="https://cwiki.apache.org/qpid/faq.html">FAQ</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Documentation</H3><UL><LI><A href="http://qpid.apache.org/documentation.html#doc-release">Latest Release</A></LI><LI><A href="http://qpid.apache.org/documentation.html#doc-trunk">Trunk</A></LI><LI><A href="http://qpid.apache.org/documentation.html#doc-archives">Archive</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Community</H3><UL><LI><A href="http://qpid.apache.org/getting_involved.html">Getting Involved</A></LI><LI><A href="http://qpid.apache.org/sour
 ce_repository.html">Source Repository</A></LI><LI><A href="http://qpid.apache.org/mailing_lists.html">Mailing Lists</A></LI><LI><A href="https://cwiki.apache.org/qpid/">Wiki</A></LI><LI><A href="https://issues.apache.org/jira/browse/qpid">Issue Reporting</A></LI><LI><A href="http://qpid.apache.org/people.html">People</A></LI><LI><A href="http://qpid.apache.org/acknowledgements.html">Acknowledgements</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Developers</H3><UL><LI><A href="https://cwiki.apache.org/qpid/building.html">Building Qpid</A></LI><LI><A href="https://cwiki.apache.org/qpid/developer-pages.html">Developer Pages</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>About AMQP</H3><UL><LI><A href="http://qpid.apache.org/amqp.html">What is AMQP?</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV c
 lass="menu_box_body"><H3>About Apache</H3><UL><LI><A href="http://www.apache.org">Home</A></LI><LI><A href="http://www.apache.org/foundation/sponsorship.html">Sponsorship</A></LI><LI><A href="http://www.apache.org/foundation/thanks.html">Thanks</A></LI><LI><A href="http://www.apache.org/security/">Security</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV></DIV><div class="main_text_area"><div class="main_text_area_top"></div><div class="main_text_area_body"><DIV class="breadcrumbs"><span class="breadcrumb-link"><a href="index.html">AMQP Messaging Broker (Java)</a></span> &gt; <span class="breadcrumb-link"><a href="Java-Broker-High-Availability.html">High Availability</a></span> &gt; <span class="breadcrumb-node">Durability Guarantees</span></DIV><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="Java-Broker-High-Availability-DurabilityGuarantee"></a>12.6. Durability Guarantees</h2></div></div></div><p>The term <a class="ulink" 
 href="http://en.wikipedia.org/wiki/ACID#Durability" target="_top">durability</a> is used to mean that once a
+      transaction is committed, it remains committed regardless of subsequent failures. A highly durable system is one where
+      loss of a committed transaction is extermely unlikely, whereas with a less durable system loss of a transaction is likely
+      in a greater number of scenarios.  Typically, the more highly durable a system the slower and more costly it will be.</p><p>Qpid exposes the all the
+      <a class="ulink" href="http://oracle.com/cd/E17277_02/html/ReplicationGuide/txn-management.html#durabilitycontrols" target="_top">durability controls</a>
+      offered by by BDB JE JA and a Qpid specific optimisation called <span class="bold"><strong>coalescing-sync</strong></span> which defaults
+      to enabled.</p><div class="section" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="Java-Broker-High-Availability-DurabilityGuarantee_BDBControls"></a>12.6.1. BDB Durability Controls</h3></div></div></div><p>BDB expresses durability as a triplet with the following form:</p><pre class="programlisting">&lt;master sync policy&gt;,&lt;replica sync policy&gt;,&lt;replica acknowledgement policy&gt;</pre><p>The sync polices controls whether the thread performing the committing thread awaits the successful completion of the
+        write, or the write and sync before continuing. The master sync policy and replica sync policy need not be the same.</p><p>For master and replic sync policies, the available values are:
+        <a class="ulink" href="http://docs.oracle.com/cd/E17277_02/html/java/com/sleepycat/je/Durability.SyncPolicy.html#SYNC" target="_top">SYNC</a>,
+        <a class="ulink" href="http://docs.oracle.com/cd/E17277_02/html/java/com/sleepycat/je/Durability.SyncPolicy.html#WRITE_NO_SYNC" target="_top">WRITE_NO_SYNC</a>,
+        <a class="ulink" href="http://docs.oracle.com/cd/E17277_02/html/java/com/sleepycat/je/Durability.SyncPolicy.html#NO_SYNC" target="_top">NO_SYNC</a>. SYNC
+        is offers the highest durability whereas NO_SYNC the lowest.</p><p>Note: the combination of a master sync policy of SYNC and <a class="link" href="Java-Broker-High-Availability-DurabilityGuarantee.html#Java-Broker-High-Availability-DurabilityGuarantee_CoalescingSync" title="12.6.2. Coalescing-sync">coalescing-sync</a>
+        true would result in poor performance with no corresponding increase in durability guarantee.  It cannot not be used.</p><p>The acknowledgement policy defines whether when a master commits a transaction, it also awaits for the replica(s) to
+         commit the same transaction before continuing.  For the two-node case, ALL and SIMPLE_MAJORITY are equal.</p><p>For acknowledgement policy, the available value are:
+         <a class="ulink" href="http://docs.oracle.com/cd/E17277_02/html/java/com/sleepycat/je/Durability.ReplicaAckPolicy.html#ALL" target="_top">ALL</a>,
+         <a class="ulink" href="http://docs.oracle.com/cd/E17277_02/html/java/com/sleepycat/je/Durability.ReplicaAckPolicy.html#SIMPLE_MAJORITY" target="_top">SIMPLE_MAJORITY</a>
+         <a class="ulink" href="http://docs.oracle.com/cd/E17277_02/html/java/com/sleepycat/je/Durability.ReplicaAckPolicy.html#NONE" target="_top">NONE</a>.</p></div><div class="section" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="Java-Broker-High-Availability-DurabilityGuarantee_CoalescingSync"></a>12.6.2. Coalescing-sync</h3></div></div></div><p>If enabled (the default) Qpid works to reduce the number of separate
+        <a class="ulink" href="http://oracle.com/javase/6/docs/api/java/io/FileDescriptor.html#sync()" target="_top">file-system sync</a> operations
+        performed by the <span class="bold"><strong>master</strong></span> on the underlying storage device thus improving performance.  It does
+        this coalescing separate sync operations arising from the different client commits operations occuring at approximately the same time.
+        It does this in such a manner not to reduce the ACID guarantees of the system.</p><p>Coalescing-sync has no effect on the behaviour of the replicas.</p></div><div class="section" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="Java-Broker-High-Availability-DurabilityGuarantee_Default"></a>12.6.3. Default</h3></div></div></div><p>The default durability guarantee is <code class="constant">NO_SYNC, NO_SYNC, SIMPLE_MAJORITY</code> with coalescing-sync enabled. The effect
+         of this combination is described in the table below. It offers a good compromise between durability guarantee and performance
+         with writes being guaranteed on the master and the additional guarantee that a majority of replicas have received the
+         transaction.</p></div><div class="section" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="Java-Broker-High-Availability-DurabilityGuarantee_Examples"></a>12.6.4. Examples</h3></div></div></div><p>Here are some examples illustrating the effects of the durability and coalescing-sync settings.</p><p>
+        </p><div class="table"><a name="id2502749"></a><p class="title"><b>Table 12.1. Effect of different durability guarantees</b></p><div class="table-contents"><table summary="Effect of different durability guarantees" border="1"><colgroup><col><col><col><col></colgroup><thead><tr><th> </th><th>Durability</th><th>Coalescing-sync</th><th>Description</th></tr></thead><tbody><tr><td>1</td><td>NO_SYNC, NO_SYNC, SIMPLE_MAJORITY</td><td>true</td><td>Before the commit returns to the client, the transaction will be written/sync'd to the Master's disk (effect of
+                   coalescing-sync) and a majority of the replica(s) will have acknowledged the <span class="bold"><strong>receipt</strong></span>
+                   of the transaction.  The replicas will write and sync the transaction to their disk at a point in the future governed by
+                   <a class="ulink" href="http://docs.oracle.com/cd/E17277_02/html/java/com/sleepycat/je/rep/ReplicationMutableConfig.html#LOG_FLUSH_TASK_INTERVAL" target="_top">ReplicationMutableConfig#LOG_FLUSH_INTERVAL</a>.
+                </td></tr><tr><td>2</td><td>NO_SYNC, WRITE_NO_SYNC, SIMPLE_MAJORITY</td><td>true</td><td>Before the commit returns to the client, the transaction will be written/sync'd to the Master's disk (effect of
+                  coalescing-sync and a majority of the replica(s) will have acknowledged the <span class="bold"><strong>write</strong></span> of
+                  the transaction to their disk.  The replicas will sync the transaction to disk at a point in the future with an upper bound governed by
+                  ReplicationMutableConfig#LOG_FLUSH_INTERVAL.</td></tr><tr><td>3</td><td>NO_SYNC, NO_SYNC, NONE</td><td>false</td><td>After the commit returns to the client, the transaction is neither guaranteed to be written to the disk of the master
+                   nor received by any of the replicas. The master and replicas will write and sync the transaction to their disk at a point
+                   in the future with an upper bound governed by ReplicationMutableConfig#LOG_FLUSH_INTERVAL. This offers the weakest durability guarantee.</td></tr></tbody></table></div></div><p><br class="table-break">
+      </p></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="Java-Broker-High-Availability-Configuration.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="Java-Broker-High-Availability-ClientFailover.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">12.5. Configuring a Virtual Host to be a node </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 12.7. Client failover configuration</td></tr></table></div><div class="main_text_area_bottom"></div></div></div></body></html>

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+<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>12.8. Qpid JMX API for HA</title><link rel="stylesheet" href="css/style.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="AMQP Messaging Broker (Java)"><link rel="up" href="Java-Broker-High-Availability.html" title="Chapter 12. High Availability"><link rel="prev" href="Java-Broker-High-Availability-ClientFailover.html" title="12.7. Client failover configuration"><link rel="next" href="Java-Broker-High-Availability-Monitoring-cluster.html" title="12.9. Monitoring cluster"></head><body><div class="container" bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><DIV class="header"><DIV class="logo"><H1>Apache Qpid™</H1><H2>Open Source AMQP Messaging</H2></DIV></DIV><DIV class="menu_box"><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Apache Qpid</H3><UL><LI><
 A href="http://qpid.apache.org/index.html">Home</A></LI><LI><A href="http://qpid.apache.org/download.html">Download</A></LI><LI><A href="http://qpid.apache.org/getting_started.html">Getting Started</A></LI><LI><A href="http://www.apache.org/licenses/">License</A></LI><LI><A href="https://cwiki.apache.org/qpid/faq.html">FAQ</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Documentation</H3><UL><LI><A href="http://qpid.apache.org/documentation.html#doc-release">Latest Release</A></LI><LI><A href="http://qpid.apache.org/documentation.html#doc-trunk">Trunk</A></LI><LI><A href="http://qpid.apache.org/documentation.html#doc-archives">Archive</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Community</H3><UL><LI><A href="http://qpid.apache.org/getting_involved.html">Getting Involved</A></LI><LI><A href="http://qpid.apache.org/source_repository.html
 ">Source Repository</A></LI><LI><A href="http://qpid.apache.org/mailing_lists.html">Mailing Lists</A></LI><LI><A href="https://cwiki.apache.org/qpid/">Wiki</A></LI><LI><A href="https://issues.apache.org/jira/browse/qpid">Issue Reporting</A></LI><LI><A href="http://qpid.apache.org/people.html">People</A></LI><LI><A href="http://qpid.apache.org/acknowledgements.html">Acknowledgements</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Developers</H3><UL><LI><A href="https://cwiki.apache.org/qpid/building.html">Building Qpid</A></LI><LI><A href="https://cwiki.apache.org/qpid/developer-pages.html">Developer Pages</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>About AMQP</H3><UL><LI><A href="http://qpid.apache.org/amqp.html">What is AMQP?</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_bod
 y"><H3>About Apache</H3><UL><LI><A href="http://www.apache.org">Home</A></LI><LI><A href="http://www.apache.org/foundation/sponsorship.html">Sponsorship</A></LI><LI><A href="http://www.apache.org/foundation/thanks.html">Thanks</A></LI><LI><A href="http://www.apache.org/security/">Security</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV></DIV><div class="main_text_area"><div class="main_text_area_top"></div><div class="main_text_area_body"><DIV class="breadcrumbs"><span class="breadcrumb-link"><a href="index.html">AMQP Messaging Broker (Java)</a></span> &gt; <span class="breadcrumb-link"><a href="Java-Broker-High-Availability.html">High Availability</a></span> &gt; <span class="breadcrumb-node">Qpid JMX API for HA</span></DIV><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="Java-Broker-High-Availability-JMXAPI"></a>12.8. Qpid JMX API for HA</h2></div></div></div><p>Qpid exposes the BDB HA store information via its JMX interfa
 ce and provides APIs to remove a Node from
+     the group, update a Node IP address, and assign a Node as the designated primary.</p><p>An instance of the <code class="classname">BDBHAMessageStore</code> MBean is instantiated by the broker for the each virtualhost using the HA store.</p><p>The reference to this MBean can be obtained via JMX API using an ObjectName like <span class="emphasis"><em>org.apache.qpid:type=BDBHAMessageStore,name=&lt;virtualhost name&gt;</em></span>
+                 where &lt;virtualhost name&gt; is the name of a specific virtualhost on the broker.</p><table border="1" id="id2502998">Mbean BDBHAMessageStore attributes<thead><tr>
+          <td>Name</td>
+          <td>Type</td>
+          <td>Accessibility</td>
+          <td>Description</td>
+        </tr></thead><tbody><tr>
+          <td>GroupName</td>
+          <td>String</td>
+          <td>Read only</td>
+          <td>Name identifying the group</td>
+        </tr><tr>
+          <td>NodeName</td>
+          <td>String</td>
+          <td>Read only</td>
+          <td>Unique name identifying the node within the group</td>
+        </tr><tr>
+          <td>NodeHostPort</td>
+          <td>String</td>
+          <td>Read only</td>
+          <td>Host/port used to replicate data between this node and others in the group</td>
+        </tr><tr>
+          <td>HelperHostPort</td>
+          <td>String</td>
+          <td>Read only</td>
+          <td>Host/port used to allow a new node to discover other group members</td>
+        </tr><tr>
+          <td>NodeState</td>
+          <td>String</td>
+          <td>Read only</td>
+          <td>Current state of the node</td>
+        </tr><tr>
+          <td>ReplicationPolicy</td>
+          <td>String</td>
+          <td>Read only</td>
+          <td>Node replication durability</td>
+        </tr><tr id="JMXDesignatedPrimary">
+          <td>DesignatedPrimary</td>
+          <td>boolean</td>
+          <td>Read/Write</td>
+          <td>Designated primary flag. Applicable to the two node case.</td>
+        </tr><tr>
+          <td>CoalescingSync</td>
+          <td>boolean</td>
+          <td>Read only</td>
+          <td>Coalescing sync flag. Applicable to the master sync policies NO_SYNC and WRITE_NO_SYNC only.</td>
+        </tr><tr>
+          <td>getAllNodesInGroup</td>
+          <td>TabularData</td>
+          <td>Read only</td>
+          <td>Get all nodes within the group, regardless of whether currently attached or not</td>
+        </tr></tbody></table><table border="1" id="id2503216">Mbean BDBHAMessageStore operations<thead><tr>
+          <td>Operation</td>
+          <td>Parameters</td>
+          <td>Returns</td>
+          <td>Description</td>
+        </tr></thead><tbody><tr>
+          <td>removeNodeFromGroup</td>
+          <td>
+            <p><span class="emphasis"><em>nodeName</em></span>, name of node, string</p>
+          </td>
+          <td>void</td>
+          <td>Remove an existing node from the group</td>
+        </tr><tr>
+          <td>updateAddress</td>
+          <td>
+            <div class="itemizedlist"><ul><li><p><span class="emphasis"><em>nodeName</em></span>, name of node, string</p></li><li><p><span class="emphasis"><em>newHostName</em></span>, new host name, string</p></li><li><p><span class="emphasis"><em>newPort</em></span>, new port number, int</p></li></ul></div>
+          </td>
+          <td>void</td>
+          <td>Update the address of another node. The node must be in a STOPPED state.</td>
+        </tr></tbody></table><div class="figure"><a name="id2503337"></a><p class="title"><b>Figure 12.7. BDBHAMessageStore view from jconsole.</b></p><div class="figure-contents"><div><img src="images/HA-BDBHAMessageStore-MBean-jconsole.png" alt="BDBHAMessageStore view from jconsole."></div></div></div><br class="figure-break"><div class="example"><a name="id2503351"></a><p class="title"><b>Example 12.3. Example of java code to get the node state value</b></p><div class="example-contents"><pre class="programlisting">
+Map&lt;String, Object&gt; environment = new HashMap&lt;String, Object&gt;();
+
+// credentials: user name and password
+environment.put(JMXConnector.CREDENTIALS, new String[] {"admin","admin"});
+JMXServiceURL url =  new JMXServiceURL("service:jmx:rmi:///jndi/rmi://localhost:9001/jmxrmi");
+JMXConnector jmxConnector = JMXConnectorFactory.connect(url, environment);
+MBeanServerConnection mbsc =  jmxConnector.getMBeanServerConnection();
+
+ObjectName queueObjectName = new ObjectName("org.apache.qpid:type=BDBHAMessageStore,name=test");
+String state = (String)mbsc.getAttribute(queueObjectName, "NodeState");
+
+System.out.println("Node state:" + state);
+        </pre><p>Example system output:</p><pre class="screen">Node state:MASTER</pre></div></div><br class="example-break"></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="Java-Broker-High-Availability-ClientFailover.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="Java-Broker-High-Availability-Monitoring-cluster.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">12.7. Client failover configuration </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 12.9. Monitoring cluster</td></tr></table></div><div class="main_text_area_bottom"></div></div></div></body></html>

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+<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>12.14. Migration of a non-HA store to HA</title><link rel="stylesheet" href="css/style.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="AMQP Messaging Broker (Java)"><link rel="up" href="Java-Broker-High-Availability.html" title="Chapter 12. High Availability"><link rel="prev" href="Java-Broker-High-Availability-Backup.html" title="12.13. Backups"><link rel="next" href="Java-Broker-High-Availability-DisasterRecovery.html" title="12.15. Disaster Recovery"></head><body><div class="container" bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><DIV class="header"><DIV class="logo"><H1>Apache Qpid™</H1><H2>Open Source AMQP Messaging</H2></DIV></DIV><DIV class="menu_box"><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Apache Qpid</H3><UL><LI><A href="http://q
 pid.apache.org/index.html">Home</A></LI><LI><A href="http://qpid.apache.org/download.html">Download</A></LI><LI><A href="http://qpid.apache.org/getting_started.html">Getting Started</A></LI><LI><A href="http://www.apache.org/licenses/">License</A></LI><LI><A href="https://cwiki.apache.org/qpid/faq.html">FAQ</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Documentation</H3><UL><LI><A href="http://qpid.apache.org/documentation.html#doc-release">Latest Release</A></LI><LI><A href="http://qpid.apache.org/documentation.html#doc-trunk">Trunk</A></LI><LI><A href="http://qpid.apache.org/documentation.html#doc-archives">Archive</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Community</H3><UL><LI><A href="http://qpid.apache.org/getting_involved.html">Getting Involved</A></LI><LI><A href="http://qpid.apache.org/source_repository.html">Source Reposit
 ory</A></LI><LI><A href="http://qpid.apache.org/mailing_lists.html">Mailing Lists</A></LI><LI><A href="https://cwiki.apache.org/qpid/">Wiki</A></LI><LI><A href="https://issues.apache.org/jira/browse/qpid">Issue Reporting</A></LI><LI><A href="http://qpid.apache.org/people.html">People</A></LI><LI><A href="http://qpid.apache.org/acknowledgements.html">Acknowledgements</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Developers</H3><UL><LI><A href="https://cwiki.apache.org/qpid/building.html">Building Qpid</A></LI><LI><A href="https://cwiki.apache.org/qpid/developer-pages.html">Developer Pages</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>About AMQP</H3><UL><LI><A href="http://qpid.apache.org/amqp.html">What is AMQP?</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>About Apa
 che</H3><UL><LI><A href="http://www.apache.org">Home</A></LI><LI><A href="http://www.apache.org/foundation/sponsorship.html">Sponsorship</A></LI><LI><A href="http://www.apache.org/foundation/thanks.html">Thanks</A></LI><LI><A href="http://www.apache.org/security/">Security</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV></DIV><div class="main_text_area"><div class="main_text_area_top"></div><div class="main_text_area_body"><DIV class="breadcrumbs"><span class="breadcrumb-link"><a href="index.html">AMQP Messaging Broker (Java)</a></span> &gt; <span class="breadcrumb-link"><a href="Java-Broker-High-Availability.html">High Availability</a></span> &gt; <span class="breadcrumb-node">Migration of a non-HA store to HA</span></DIV><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="Java-Broker-High-Availability-MigrationFromNonHA"></a>12.14. Migration of a non-HA store to HA</h2></div></div></div><p>Non HA stores starting from schema v
 ersion 4 (0.14 Qpid release) can be automatically converted into HA store on broker startup if replication is first enabled with the <a class="ulink" href="http://docs.oracle.com/cd/E17277_02/html/java/com/sleepycat/je/rep/util/DbEnableReplication.html" target="_top"><code class="classname">DbEnableReplication</code></a> utility from the BDB JE jar.</p><p>DbEnableReplication converts a non HA store into an HA store and can be used as follows:</p><div class="example"><a name="id2503863"></a><p class="title"><b>Example 12.7. Enabling replication</b></p><div class="example-contents"><span class="command"><strong>
+java -jar je-5.0.58.jar DbEnableReplication -h /path/to/store -groupName MyReplicationGroup -nodeName MyNode1 -nodeHostPort  localhost:5001
+        </strong></span></div></div><br class="example-break"><p>In the examples above, je jar of version 5.0.58 is used to convert store at <span class="emphasis"><em>/path/to/store</em></span> into HA store having replication group name <span class="emphasis"><em>MyReplicationGroup</em></span>, node name <span class="emphasis"><em>MyNode1</em></span> and running on host <span class="emphasis"><em>localhost</em></span> and port <span class="emphasis"><em>5001</em></span>.</p><p>After running DbEnableReplication and updating the virtual host store to configuration to be an HA message store, like in example below,
+    on broker start up the store schema will be upgraded to the most recent version and the broker can be used as normal.</p><div class="example"><a name="id2503905"></a><p class="title"><b>Example 12.8. Example of XML configuration for HA message store</b></p><div class="example-contents"><pre class="programlisting">
+&lt;store&gt;
+    &lt;class&gt;org.apache.qpid.server.store.berkeleydb.BDBHAMessageStore&lt;/class&gt;
+    &lt;environment-path&gt;/path/to/store&lt;/environment-path&gt;
+    &lt;highAvailability&gt;
+        &lt;groupName&gt;MyReplicationGroup&lt;/groupName&gt;
+        &lt;nodeName&gt;MyNode1&lt;/nodeName&gt;
+        &lt;nodeHostPort&gt;localhost:5001&lt;/nodeHostPort&gt;
+        &lt;helperHostPort&gt;localhost:5001&lt;/helperHostPort&gt;
+    &lt;/highAvailability&gt;
+&lt;/store&gt;</pre></div></div><br class="example-break"><p>The Replica nodes can be started with empty stores. The data will be automatically copied from Master to Replica on Replica start-up.
+      This will take a period of time determined by the size of the Masters store and the network bandwidth between the nodes.</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>Due to existing caveats in Berkeley JE with copying of data from Master into Replica it is recommended to restart the Master node after store schema upgrade is finished before starting the Replica nodes.</p></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="Java-Broker-High-Availability-Backup.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="Java-Broker-High-Availability-DisasterRecovery.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">12.13. Backups </td><td width="20%" align="center"><a accesskey="
 h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 12.15. Disaster Recovery</td></tr></table></div><div class="main_text_area_bottom"></div></div></div></body></html>

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+<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>12.9. Monitoring cluster</title><link rel="stylesheet" href="css/style.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="AMQP Messaging Broker (Java)"><link rel="up" href="Java-Broker-High-Availability.html" title="Chapter 12. High Availability"><link rel="prev" href="Java-Broker-High-Availability-JMXAPI.html" title="12.8. Qpid JMX API for HA"><link rel="next" href="Java-Broker-High-Availability-DiskSpace.html" title="12.10. Disk space requirements"></head><body><div class="container" bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><DIV class="header"><DIV class="logo"><H1>Apache Qpid™</H1><H2>Open Source AMQP Messaging</H2></DIV></DIV><DIV class="menu_box"><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Apache Qpid</H3><UL><LI><A href="http://qpid.ap
 ache.org/index.html">Home</A></LI><LI><A href="http://qpid.apache.org/download.html">Download</A></LI><LI><A href="http://qpid.apache.org/getting_started.html">Getting Started</A></LI><LI><A href="http://www.apache.org/licenses/">License</A></LI><LI><A href="https://cwiki.apache.org/qpid/faq.html">FAQ</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Documentation</H3><UL><LI><A href="http://qpid.apache.org/documentation.html#doc-release">Latest Release</A></LI><LI><A href="http://qpid.apache.org/documentation.html#doc-trunk">Trunk</A></LI><LI><A href="http://qpid.apache.org/documentation.html#doc-archives">Archive</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Community</H3><UL><LI><A href="http://qpid.apache.org/getting_involved.html">Getting Involved</A></LI><LI><A href="http://qpid.apache.org/source_repository.html">Source Repository</A
 ></LI><LI><A href="http://qpid.apache.org/mailing_lists.html">Mailing Lists</A></LI><LI><A href="https://cwiki.apache.org/qpid/">Wiki</A></LI><LI><A href="https://issues.apache.org/jira/browse/qpid">Issue Reporting</A></LI><LI><A href="http://qpid.apache.org/people.html">People</A></LI><LI><A href="http://qpid.apache.org/acknowledgements.html">Acknowledgements</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Developers</H3><UL><LI><A href="https://cwiki.apache.org/qpid/building.html">Building Qpid</A></LI><LI><A href="https://cwiki.apache.org/qpid/developer-pages.html">Developer Pages</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>About AMQP</H3><UL><LI><A href="http://qpid.apache.org/amqp.html">What is AMQP?</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>About Apache</H
 3><UL><LI><A href="http://www.apache.org">Home</A></LI><LI><A href="http://www.apache.org/foundation/sponsorship.html">Sponsorship</A></LI><LI><A href="http://www.apache.org/foundation/thanks.html">Thanks</A></LI><LI><A href="http://www.apache.org/security/">Security</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV></DIV><div class="main_text_area"><div class="main_text_area_top"></div><div class="main_text_area_body"><DIV class="breadcrumbs"><span class="breadcrumb-link"><a href="index.html">AMQP Messaging Broker (Java)</a></span> &gt; <span class="breadcrumb-link"><a href="Java-Broker-High-Availability.html">High Availability</a></span> &gt; <span class="breadcrumb-node">Monitoring cluster</span></DIV><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="Java-Broker-High-Availability-Monitoring-cluster"></a>12.9. Monitoring cluster</h2></div></div></div><p>In order to discover potential issues with HA Cluster early, all nodes in
  the Cluster should be monitored on regular basis
+    using the following techniques:</p><div class="itemizedlist"><ul><li><p>Broker log files scrapping for WARN or ERROR entries and operational log entries like:</p><div class="itemizedlist"><ul><li><p><span class="emphasis"><em>MST-1007 :</em></span> Store Passivated. It can indicate that Master virtual host has gone down.</p></li><li><p><span class="emphasis"><em>MST-1006 :</em></span> Recovery Complete. It can indicate that a former Replica virtual host is up and became the Master.</p></li></ul></div></li><li><p>Disk space usage and system load using system tools.</p></li><li><p>Berkeley HA node status using <a class="ulink" href="http://docs.oracle.com/cd/E17277_02/html/java/com/sleepycat/je/rep/util/DbPing.html" target="_top"><code class="classname">DbPing</code></a> utility.</p><div class="example"><a name="id2503461"></a><p class="title"><b>Example 12.4. Using <code class="classname">DbPing</code> utility for monitoring HA nodes.</b></p><div class="example-cont
 ents"><span class="command"><strong>
+java -jar je-5.0.58.jar DbPing -groupName TestClusterGroup -nodeName Node-5001 -nodeHost localhost:5001 -socketTimeout 10000
+</strong></span><pre class="screen">
+Current state of node: Node-5001 from group: TestClusterGroup
+  Current state: MASTER
+  Current master: Node-5001
+  Current JE version: 5.0.58
+  Current log version: 8
+  Current transaction end (abort or commit) VLSN: 165
+  Current master transaction end (abort or commit) VLSN: 0
+  Current active feeders on node: 0
+  Current system load average: 0.35
+</pre></div></div><br class="example-break"><p>In the example above <code class="classname">DbPing</code> utility requested status of Cluster node with name
+            <span class="emphasis"><em>Node-5001</em></span> from replication group <span class="emphasis"><em>TestClusterGroup</em></span> running on host <span class="emphasis"><em>localhost:5001</em></span>.
+            The state of the node was reported into a system output.
+            </p></li><li><p>Using Qpid broker JMX interfaces.</p><p>Mbean <code class="classname">BDBHAMessageStore</code> can be used to request the following node information:</p><div class="itemizedlist"><ul><li><p><span class="emphasis"><em>NodeState</em></span> indicates whether node is a Master or Replica.</p></li><li><p><span class="emphasis"><em>Durability</em></span> replication durability.</p></li><li><p><span class="emphasis"><em>DesignatedPrimary</em></span> indicates whether Master node is designated primary.</p></li><li><p><span class="emphasis"><em>GroupName</em></span> replication group name.</p></li><li><p><span class="emphasis"><em>NodeName</em></span> node name.</p></li><li><p><span class="emphasis"><em>NodeHostPort</em></span> node host and port.</p></li><li><p><span class="emphasis"><em>HelperHostPort</em></span> helper host and port.</p></li><li><p><span class="emphasis"><em>AllNodesInGroup</em></span> lists of all nodes in the replication group includi
 ng their names, hosts and ports.</p></li></ul></div><p>For more details about <code class="classname">BDBHAMessageStore</code> MBean please refer section <a class="link" href="Java-Broker-High-Availability-JMXAPI.html" title="12.8. Qpid JMX API for HA">Qpid JMX API for HA</a></p></li></ul></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="Java-Broker-High-Availability-JMXAPI.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="Java-Broker-High-Availability-DiskSpace.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">12.8. Qpid JMX API for HA </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 12.10. Disk space requirements</td></tr></table></div
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+<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>12.4. Multi Node Cluster</title><link rel="stylesheet" href="css/style.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="AMQP Messaging Broker (Java)"><link rel="up" href="Java-Broker-High-Availability.html" title="Chapter 12. High Availability"><link rel="prev" href="Java-Broker-High-Availability-TwoNodeCluster.html" title="12.3. Two Node Cluster"><link rel="next" href="Java-Broker-High-Availability-Configuration.html" title="12.5. Configuring a Virtual Host to be a node"></head><body><div class="container" bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><DIV class="header"><DIV class="logo"><H1>Apache Qpid™</H1><H2>Open Source AMQP Messaging</H2></DIV></DIV><DIV class="menu_box"><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Apache Qpid</H3><UL><LI
 ><A href="http://qpid.apache.org/index.html">Home</A></LI><LI><A href="http://qpid.apache.org/download.html">Download</A></LI><LI><A href="http://qpid.apache.org/getting_started.html">Getting Started</A></LI><LI><A href="http://www.apache.org/licenses/">License</A></LI><LI><A href="https://cwiki.apache.org/qpid/faq.html">FAQ</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Documentation</H3><UL><LI><A href="http://qpid.apache.org/documentation.html#doc-release">Latest Release</A></LI><LI><A href="http://qpid.apache.org/documentation.html#doc-trunk">Trunk</A></LI><LI><A href="http://qpid.apache.org/documentation.html#doc-archives">Archive</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Community</H3><UL><LI><A href="http://qpid.apache.org/getting_involved.html">Getting Involved</A></LI><LI><A href="http://qpid.apache.org/source_repository.ht
 ml">Source Repository</A></LI><LI><A href="http://qpid.apache.org/mailing_lists.html">Mailing Lists</A></LI><LI><A href="https://cwiki.apache.org/qpid/">Wiki</A></LI><LI><A href="https://issues.apache.org/jira/browse/qpid">Issue Reporting</A></LI><LI><A href="http://qpid.apache.org/people.html">People</A></LI><LI><A href="http://qpid.apache.org/acknowledgements.html">Acknowledgements</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Developers</H3><UL><LI><A href="https://cwiki.apache.org/qpid/building.html">Building Qpid</A></LI><LI><A href="https://cwiki.apache.org/qpid/developer-pages.html">Developer Pages</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>About AMQP</H3><UL><LI><A href="http://qpid.apache.org/amqp.html">What is AMQP?</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_b
 ody"><H3>About Apache</H3><UL><LI><A href="http://www.apache.org">Home</A></LI><LI><A href="http://www.apache.org/foundation/sponsorship.html">Sponsorship</A></LI><LI><A href="http://www.apache.org/foundation/thanks.html">Thanks</A></LI><LI><A href="http://www.apache.org/security/">Security</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV></DIV><div class="main_text_area"><div class="main_text_area_top"></div><div class="main_text_area_body"><DIV class="breadcrumbs"><span class="breadcrumb-link"><a href="index.html">AMQP Messaging Broker (Java)</a></span> &gt; <span class="breadcrumb-link"><a href="Java-Broker-High-Availability.html">High Availability</a></span> &gt; <span class="breadcrumb-node">Multi Node Cluster</span></DIV><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="Java-Broker-High-Availability-MultiNodeCluster"></a>12.4. Multi Node Cluster</h2></div></div></div><p>Multi node clusters, that is clusters where the num
 ber of nodes is three or more, are not yet
+         ready for use.</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="Java-Broker-High-Availability-TwoNodeCluster.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="Java-Broker-High-Availability-Configuration.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">12.3. Two Node Cluster </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 12.5. Configuring a Virtual Host to be a node</td></tr></table></div><div class="main_text_area_bottom"></div></div></div></body></html>

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+<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>12.11. Network Requirements</title><link rel="stylesheet" href="css/style.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="AMQP Messaging Broker (Java)"><link rel="up" href="Java-Broker-High-Availability.html" title="Chapter 12. High Availability"><link rel="prev" href="Java-Broker-High-Availability-DiskSpace.html" title="12.10. Disk space requirements"><link rel="next" href="Java-Broker-High-Availability-Security.html" title="12.12. Security"></head><body><div class="container" bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><DIV class="header"><DIV class="logo"><H1>Apache Qpid™</H1><H2>Open Source AMQP Messaging</H2></DIV></DIV><DIV class="menu_box"><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Apache Qpid</H3><UL><LI><A href="http://qpid.apache.
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 ><LI><A href="http://qpid.apache.org/mailing_lists.html">Mailing Lists</A></LI><LI><A href="https://cwiki.apache.org/qpid/">Wiki</A></LI><LI><A href="https://issues.apache.org/jira/browse/qpid">Issue Reporting</A></LI><LI><A href="http://qpid.apache.org/people.html">People</A></LI><LI><A href="http://qpid.apache.org/acknowledgements.html">Acknowledgements</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Developers</H3><UL><LI><A href="https://cwiki.apache.org/qpid/building.html">Building Qpid</A></LI><LI><A href="https://cwiki.apache.org/qpid/developer-pages.html">Developer Pages</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>About AMQP</H3><UL><LI><A href="http://qpid.apache.org/amqp.html">What is AMQP?</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>About Apache</H3><UL
 ><LI><A href="http://www.apache.org">Home</A></LI><LI><A href="http://www.apache.org/foundation/sponsorship.html">Sponsorship</A></LI><LI><A href="http://www.apache.org/foundation/thanks.html">Thanks</A></LI><LI><A href="http://www.apache.org/security/">Security</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV></DIV><div class="main_text_area"><div class="main_text_area_top"></div><div class="main_text_area_body"><DIV class="breadcrumbs"><span class="breadcrumb-link"><a href="index.html">AMQP Messaging Broker (Java)</a></span> &gt; <span class="breadcrumb-link"><a href="Java-Broker-High-Availability.html">High Availability</a></span> &gt; <span class="breadcrumb-node">Network Requirements</span></DIV><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="Java-Broker-High-Availability-Network-Requirements"></a>12.11. Network Requirements</h2></div></div></div><p>The HA Cluster performance depends on the network bandwidth, its use by
  existing traffic, and quality of service.</p><p>In order to achieve the best performance it is recommended to use a separate network infrastructure for the Qpid HA Nodes
+     which might include installation of dedicated network hardware on Broker hosts, assigning a higher priority to replication ports,
+     installing a cluster in a separate network not impacted by any other traffic.</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="Java-Broker-High-Availability-DiskSpace.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="Java-Broker-High-Availability-Security.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">12.10. Disk space requirements </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 12.12. Security</td></tr></table></div><div class="main_text_area_bottom"></div></div></div></body></html>

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+<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>12.2. HA offerings of the Java Broker</title><link rel="stylesheet" href="css/style.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="AMQP Messaging Broker (Java)"><link rel="up" href="Java-Broker-High-Availability.html" title="Chapter 12. High Availability"><link rel="prev" href="Java-Broker-High-Availability.html" title="Chapter 12. High Availability"><link rel="next" href="Java-Broker-High-Availability-TwoNodeCluster.html" title="12.3. Two Node Cluster"></head><body><div class="container" bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><DIV class="header"><DIV class="logo"><H1>Apache Qpid™</H1><H2>Open Source AMQP Messaging</H2></DIV></DIV><DIV class="menu_box"><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Apache Qpid</H3><UL><LI><A href="http
 ://qpid.apache.org/index.html">Home</A></LI><LI><A href="http://qpid.apache.org/download.html">Download</A></LI><LI><A href="http://qpid.apache.org/getting_started.html">Getting Started</A></LI><LI><A href="http://www.apache.org/licenses/">License</A></LI><LI><A href="https://cwiki.apache.org/qpid/faq.html">FAQ</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Documentation</H3><UL><LI><A href="http://qpid.apache.org/documentation.html#doc-release">Latest Release</A></LI><LI><A href="http://qpid.apache.org/documentation.html#doc-trunk">Trunk</A></LI><LI><A href="http://qpid.apache.org/documentation.html#doc-archives">Archive</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Community</H3><UL><LI><A href="http://qpid.apache.org/getting_involved.html">Getting Involved</A></LI><LI><A href="http://qpid.apache.org/source_repository.html">Source Rep
 ository</A></LI><LI><A href="http://qpid.apache.org/mailing_lists.html">Mailing Lists</A></LI><LI><A href="https://cwiki.apache.org/qpid/">Wiki</A></LI><LI><A href="https://issues.apache.org/jira/browse/qpid">Issue Reporting</A></LI><LI><A href="http://qpid.apache.org/people.html">People</A></LI><LI><A href="http://qpid.apache.org/acknowledgements.html">Acknowledgements</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Developers</H3><UL><LI><A href="https://cwiki.apache.org/qpid/building.html">Building Qpid</A></LI><LI><A href="https://cwiki.apache.org/qpid/developer-pages.html">Developer Pages</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>About AMQP</H3><UL><LI><A href="http://qpid.apache.org/amqp.html">What is AMQP?</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>About
  Apache</H3><UL><LI><A href="http://www.apache.org">Home</A></LI><LI><A href="http://www.apache.org/foundation/sponsorship.html">Sponsorship</A></LI><LI><A href="http://www.apache.org/foundation/thanks.html">Thanks</A></LI><LI><A href="http://www.apache.org/security/">Security</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV></DIV><div class="main_text_area"><div class="main_text_area_top"></div><div class="main_text_area_body"><DIV class="breadcrumbs"><span class="breadcrumb-link"><a href="index.html">AMQP Messaging Broker (Java)</a></span> &gt; <span class="breadcrumb-link"><a href="Java-Broker-High-Availability.html">High Availability</a></span> &gt; <span class="breadcrumb-node">HA offerings of the Java Broker</span></DIV><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="Java-Broker-High-Availability-OfferingsOfJavaBroker"></a>12.2. HA offerings of the Java Broker</h2></div></div></div><p>The Java Broker's HA offering beca
 me available at release <span class="bold"><strong>0.18</strong></span>.  HA is provided by way of the HA
+      features built into the <a class="ulink" href="http://www.oracle.com/technetwork/products/berkeleydb/overview/index-093405.html" target="_top">Java Edition of the Berkley Database (BDB JE)</a> and as such
+      is currently only available to Java Broker users who use the optional BDB JE based persistence store. This
+      <span class="bold"><strong>optional</strong></span> store requires the use of BDB JE which is licensed under the Sleepycat Licence, which is
+      not compatible with the Apache Licence and thus BDB JE is not distributed with Qpid. Users who elect to use this optional store for
+      the broker have to provide this dependency.</p><p>HA in the Java Broker provides an <span class="bold"><strong>Active/Passive</strong></span> mode of operation with Virtual hosts being
+      the unit of replication.  The Active node (referred to as the <span class="bold"><strong>Master</strong></span>) accepts all work from all the clients.
+       The Passive nodes (referred to as <span class="bold"><strong>Replicas</strong></span>) are unavailable for work: the only task they must perform is
+       to remain in synch with the Master node by consuming a replication stream containing all data and state.</p><p>If the Master node fails, a Replica node is elected to become the new Master node.  All clients automatically failover
+      <sup>[<a name="id2495625" href="#ftn.id2495625" class="footnote">5</a>]</sup> to the new Master and continue their work.</p><p>The Java Broker HA solution is incompatible with the HA solution offered by the CPP Broker.  It is not possible to co-locate Java and CPP
+       Brokers within the same cluster.</p><p>HA is not currently available for those using the the <span class="bold"><strong>Derby Store</strong></span> or <span class="bold"><strong>Memory
+      Message Store</strong></span>.</p><div class="footnotes"><br><hr width="100" align="left"><div class="footnote"><p><sup>[<a name="ftn.id2495625" href="#id2495625" class="para">5</a>] </sup>The automatic failover feature is available only for AMQP connections from the Java client.  Management connections (JMX)
+        do not current offer this feature.</p></div></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="Java-Broker-High-Availability.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="Java-Broker-High-Availability-TwoNodeCluster.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 12. High Availability </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 12.3. Two Node Cluster</td></tr></table></div><div class="main_text_area_bottom"></div></div></div></body></html>

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+<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>12.16. Performance</title><link rel="stylesheet" href="css/style.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="AMQP Messaging Broker (Java)"><link rel="up" href="Java-Broker-High-Availability.html" title="Chapter 12. High Availability"><link rel="prev" href="Java-Broker-High-Availability-DisasterRecovery.html" title="12.15. Disaster Recovery"><link rel="next" href="Java-Broker-Miscellaneous.html" title="Chapter 13. Miscellaneous"></head><body><div class="container" bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><DIV class="header"><DIV class="logo"><H1>Apache Qpid™</H1><H2>Open Source AMQP Messaging</H2></DIV></DIV><DIV class="menu_box"><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Apache Qpid</H3><UL><LI><A href="http://qpid.apache.org/inde
 x.html">Home</A></LI><LI><A href="http://qpid.apache.org/download.html">Download</A></LI><LI><A href="http://qpid.apache.org/getting_started.html">Getting Started</A></LI><LI><A href="http://www.apache.org/licenses/">License</A></LI><LI><A href="https://cwiki.apache.org/qpid/faq.html">FAQ</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Documentation</H3><UL><LI><A href="http://qpid.apache.org/documentation.html#doc-release">Latest Release</A></LI><LI><A href="http://qpid.apache.org/documentation.html#doc-trunk">Trunk</A></LI><LI><A href="http://qpid.apache.org/documentation.html#doc-archives">Archive</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Community</H3><UL><LI><A href="http://qpid.apache.org/getting_involved.html">Getting Involved</A></LI><LI><A href="http://qpid.apache.org/source_repository.html">Source Repository</A></LI><LI><A 
 href="http://qpid.apache.org/mailing_lists.html">Mailing Lists</A></LI><LI><A href="https://cwiki.apache.org/qpid/">Wiki</A></LI><LI><A href="https://issues.apache.org/jira/browse/qpid">Issue Reporting</A></LI><LI><A href="http://qpid.apache.org/people.html">People</A></LI><LI><A href="http://qpid.apache.org/acknowledgements.html">Acknowledgements</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Developers</H3><UL><LI><A href="https://cwiki.apache.org/qpid/building.html">Building Qpid</A></LI><LI><A href="https://cwiki.apache.org/qpid/developer-pages.html">Developer Pages</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>About AMQP</H3><UL><LI><A href="http://qpid.apache.org/amqp.html">What is AMQP?</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>About Apache</H3><UL><LI><A 
 href="http://www.apache.org">Home</A></LI><LI><A href="http://www.apache.org/foundation/sponsorship.html">Sponsorship</A></LI><LI><A href="http://www.apache.org/foundation/thanks.html">Thanks</A></LI><LI><A href="http://www.apache.org/security/">Security</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV></DIV><div class="main_text_area"><div class="main_text_area_top"></div><div class="main_text_area_body"><DIV class="breadcrumbs"><span class="breadcrumb-link"><a href="index.html">AMQP Messaging Broker (Java)</a></span> &gt; <span class="breadcrumb-link"><a href="Java-Broker-High-Availability.html">High Availability</a></span> &gt; <span class="breadcrumb-node">Performance</span></DIV><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="Java-Broker-High-Availability-Performance"></a>12.16. Performance</h2></div></div></div><p>The aim of this section is not to provide exact performance metrics relating to HA, as this depends heavil
 y on the test
+    environment, but rather showing an impact of HA on Qpid broker performance in comparison with the Non HA case.</p><p>For testing of impact of HA on a broker performance a special test script was written using Qpid performance test framework.
+    The script opened a number of connections to the Qpid broker, created producers and consumers on separate connections,
+    and published test messages with concurrent producers into a test queue and consumed them with concurrent consumers.
+    The table below shows the number of producers/consumers used in the tests.
+    The overall throughput was collected for each configuration.
+    </p><table border="1" id="id2504116">Number of producers/consumers in performance tests<thead><tr>
+          <th>Test</th>
+          <th>Number of producers</th>
+          <th>Number of consumers</th>
+        </tr></thead><tbody><tr>
+          <td>1</td>
+          <td>1</td>
+          <td>1</td>
+        </tr><tr>
+          <td>2</td>
+          <td>2</td>
+          <td>2</td>
+        </tr><tr>
+          <td>3</td>
+          <td>4</td>
+          <td>4</td>
+        </tr><tr>
+          <td>4</td>
+          <td>8</td>
+          <td>8</td>
+        </tr><tr>
+          <td>5</td>
+          <td>16</td>
+          <td>16</td>
+        </tr><tr>
+          <td>6</td>
+          <td>32</td>
+          <td>32</td>
+        </tr><tr>
+          <td>7</td>
+          <td>64</td>
+          <td>64</td>
+        </tr></tbody></table><p>The test was run against the following Qpid Broker configurations</p><div class="itemizedlist"><ul><li><p>Non HA Broker</p></li><li><p>HA 2 Nodes Cluster with durability <span class="emphasis"><em>SYNC,SYNC,ALL</em></span></p></li><li><p>HA 2 Nodes Cluster with durability <span class="emphasis"><em>WRITE_NO_SYNC,WRITE_NO_SYNC,ALL</em></span></p></li><li><p>HA 2 Nodes Cluster with durability <span class="emphasis"><em>WRITE_NO_SYNC,WRITE_NO_SYNC,ALL</em></span> and <span class="emphasis"><em>coalescing-sync</em></span> Qpid mode</p></li><li><p>HA 2 Nodes Cluster with durability <span class="emphasis"><em>WRITE_NO_SYNC,NO_SYNC,ALL</em></span> and <span class="emphasis"><em>coalescing-sync</em></span> Qpid mode</p></li><li><p>HA 2 Nodes Cluster with durability <span class="emphasis"><em>NO_SYNC,NO_SYNC,ALL</em></span> and <span class="emphasis"><em>coalescing-sync</em></span> Qpid option</p></li></ul></div><p>The evironment used in testing consis
 ted of 2 servers with 4 CPU cores (2x Intel(r) Xeon(R) CPU 5150@2.66GHz), 4GB of RAM
+        and running under OS Red Hat Enterprise Linux AS release 4 (Nahant Update 4). Network bandwidth was 1Gbit.
+    </p><p>We ran Master node on the first server and Replica and clients(both consumers and producers) on the second server.</p><p>In non-HA case Qpid Broker was run on a first server and clients were run on a second server.</p><p>The table below contains the test results we measured on this environment for different Broker configurations.</p><p>Each result is represented by throughput value in KB/second and difference in % between HA configuration and non HA case for the same number of clients.</p><table border="1" id="id2504368">Performance Comparison<thead><tr>
+          <td>Test/Broker</td>
+          <td>No HA</td>
+          <td>SYNC, SYNC, ALL</td>
+          <td>WRITE_NO_SYNC, WRITE_NO_SYNC, ALL</td>
+          <td>WRITE_NO_SYNC, WRITE_NO_SYNC, ALL - coalescing-sync</td>
+          <td>WRITE_NO_SYNC, NO_SYNC,ALL - coalescing-sync</td>
+          <td>NO_SYNC, NO_SYNC, ALL - coalescing-sync</td>
+        </tr></thead><tbody><tr>
+          <td>1 (1/1)</td>
+          <td>0.0%</td>
+          <td>-61.4%</td>
+          <td>117.0%</td>
+          <td>-16.02%</td>
+          <td>-9.58%</td>
+          <td>-25.47%</td>
+        </tr><tr>
+          <td>2 (2/2)</td>
+          <td>0.0%</td>
+          <td>-75.43%</td>
+          <td>67.87%</td>
+          <td>-66.6%</td>
+          <td>-69.02%</td>
+          <td>-30.43%</td>
+        </tr><tr>
+          <td>3 (4/4)</td>
+          <td>0.0%</td>
+          <td>-84.89%</td>
+          <td>24.19%</td>
+          <td>-71.02%</td>
+          <td>-69.37%</td>
+          <td>-43.67%</td>
+        </tr><tr>
+          <td>4 (8/8)</td>
+          <td>0.0%</td>
+          <td>-91.17%</td>
+          <td>-22.97%</td>
+          <td>-82.32%</td>
+          <td>-83.42%</td>
+          <td>-55.5%</td>
+        </tr><tr>
+          <td>5 (16/16)</td>
+          <td>0.0%</td>
+          <td>-91.16%</td>
+          <td>-21.42%</td>
+          <td>-86.6%</td>
+          <td>-86.37%</td>
+          <td>-46.99%</td>
+        </tr><tr>
+          <td>6 (32/32)</td>
+          <td>0.0%</td>
+          <td>-94.83%</td>
+          <td>-51.51%</td>
+          <td>-92.15%</td>
+          <td>-92.02%</td>
+          <td>-57.59%</td>
+        </tr><tr>
+          <td>7 (64/64)</td>
+          <td>0.0%</td>
+          <td>-94.2%</td>
+          <td>-41.84%</td>
+          <td>-89.55%</td>
+          <td>-89.55%</td>
+          <td>-50.54%</td>
+        </tr></tbody></table><p>The figure below depicts the graphs for the performance test results</p><div class="figure"><a name="id2504632"></a><p class="title"><b>Figure 12.8. Test results</b></p><div class="figure-contents"><div><img src="images/HA-perftests-results.png" alt="Test results"></div></div></div><br class="figure-break"><p>On using durability <span class="emphasis"><em>SYNC,SYNC,ALL</em></span> (without coalescing-sync) the performance drops significantly (by 62-95%) in comparison with non HA broker.</p><p>Whilst, on using durability <span class="emphasis"><em>WRITE_NO_SYNC,WRITE_NO_SYNC,ALL</em></span> (without coalescing-sync) the performance drops by only half, but with loss of durability guarantee, so is not recommended.</p><p>In order to have better performance with HA, Qpid Broker comes up with the special mode called <a class="link" href="Java-Broker-High-Availability-DurabilityGuarantee.html#Java-Broker-High-Availability-DurabilityGuarantee_Co
 alescingSync" title="12.6.2. Coalescing-sync">coalescing-sync</a>,
+    With this mode enabled, Qpid broker batches the concurrent transaction commits and syncs transaction data into Master disk in one go.
+    As result, the HA performance only drops by 25-60% for durability <span class="emphasis"><em>NO_SYNC,NO_SYNC,ALL</em></span> and by 10-90% for <span class="emphasis"><em>WRITE_NO_SYNC,WRITE_NO_SYNC,ALL</em></span>.</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="Java-Broker-High-Availability-DisasterRecovery.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="Java-Broker-Miscellaneous.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">12.15. Disaster Recovery </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 13. Miscellaneous</td></tr></table></div><div class="main_text_area_bottom"></div></div></div></body></html>

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+<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>12.12. Security</title><link rel="stylesheet" href="css/style.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="AMQP Messaging Broker (Java)"><link rel="up" href="Java-Broker-High-Availability.html" title="Chapter 12. High Availability"><link rel="prev" href="Java-Broker-High-Availability-Network-Requirements.html" title="12.11. Network Requirements"><link rel="next" href="Java-Broker-High-Availability-Backup.html" title="12.13. Backups"></head><body><div class="container" bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><DIV class="header"><DIV class="logo"><H1>Apache Qpid™</H1><H2>Open Source AMQP Messaging</H2></DIV></DIV><DIV class="menu_box"><DIV class="menu_box_top"></DIV><DIV class="menu_box_body"><H3>Apache Qpid</H3><UL><LI><A href="http://qpid.apache.org/ind
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  href="http://www.apache.org">Home</A></LI><LI><A href="http://www.apache.org/foundation/sponsorship.html">Sponsorship</A></LI><LI><A href="http://www.apache.org/foundation/thanks.html">Thanks</A></LI><LI><A href="http://www.apache.org/security/">Security</A></LI></UL></DIV><DIV class="menu_box_bottom"></DIV></DIV><div class="main_text_area"><div class="main_text_area_top"></div><div class="main_text_area_body"><DIV class="breadcrumbs"><span class="breadcrumb-link"><a href="index.html">AMQP Messaging Broker (Java)</a></span> &gt; <span class="breadcrumb-link"><a href="Java-Broker-High-Availability.html">High Availability</a></span> &gt; <span class="breadcrumb-node">Security</span></DIV><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="Java-Broker-High-Availability-Security"></a>12.12. Security</h2></div></div></div><p>At the moment Berkeley replication API supports only TCP/IP protocol to transfer replication data between Master a
 nd Replicas.</p><p>As result, the replicated data is unprotected and can be intercepted by anyone having access to the replication network.</p><p>Also, anyone who can access to this network can introduce a new node and therefore receive a copy of the data.</p><p>In order to reduce the security risks the entire HA cluster is recommended to run in a separate network protected from general access.</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="Java-Broker-High-Availability-Network-Requirements.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="Java-Broker-High-Availability-Backup.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">12.11. Network Requirements </td><td width="20%" align="center"><a accesskey="h" href="index.html">H
 ome</a></td><td width="40%" align="right" valign="top"> 12.13. Backups</td></tr></table></div><div class="main_text_area_bottom"></div></div></div></body></html>



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