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From rob...@apache.org
Subject [40/52] [partial] qpid-site git commit: scrub various older releases from the site
Date Fri, 14 Oct 2016 15:48:26 GMT
http://git-wip-us.apache.org/repos/asf/qpid-site/blob/a39b425b/content/releases/qpid-0.26/java-broker/book/Java-Broker-Getting-Started.html
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diff --git a/content/releases/qpid-0.26/java-broker/book/Java-Broker-Getting-Started.html b/content/releases/qpid-0.26/java-broker/book/Java-Broker-Getting-Started.html
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-          <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">Chapter&#160;3.&#160;Getting Started</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Installation-InstallationUnix.html">Prev</a>&#160;</td><th align="center" width="60%">&#160;</th><td align="right" width="20%">&#160;<a accesskey="n" href="Java-Broker-Getting-Started-Starting-Stopping-Windows.html">Next</a></td></tr></table><hr /></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a id="Java-Broker-Getting-Started"></a>Chapter&#160;3.&#160;Getting Started</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-Getting-Started.html#Java-Broker-Getting-Started-Introduction">3.1. Introduction</a></span></dt><dt><span class="section"><a href="Java-Broker-Getting-Started-Starting-Stopping-Windows.html">3.2. Star
 ting/Stopping the broker on Windows</a></span></dt><dt><span class="section"><a href="Java-Broker-Getting-Started-Starting-Stopping-Unix.html">3.3. Starting/Stopping the broker on Unix</a></span></dt><dt><span class="section"><a href="Java-Broker-Getting-Started-LogFile.html">3.4. Log file</a></span></dt><dt><span class="section"><a href="Java-Broker-Getting-Started-CommandLine.html">3.5. Using the command line</a></span></dt></dl></div><div class="section"><div class="titlepage"><div><div><h2 class="title"><a id="Java-Broker-Getting-Started-Introduction"></a>3.1.&#160;Introduction</h2></div></div></div><p>
-      This section describes how to start and stop the Java Broker, and outlines the various command line options.
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-      For additional details about the broker configuration store and related command line arguments see
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http://git-wip-us.apache.org/repos/asf/qpid-site/blob/a39b425b/content/releases/qpid-0.26/java-broker/book/Java-Broker-High-Availability-Backup.html
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-<!DOCTYPE html>
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-
-        <div id="-middle-content">
-          <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">13.13.&#160;Backups</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-High-Availability-Security.html">Prev</a>&#160;</td><th align="center" width="60%">Chapter&#160;13.&#160;High Availability</th><td align="right" width="20%">&#160;<a accesskey="n" href="Java-Broker-High-Availability-MigrationFromNonHA.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title"><a id="Java-Broker-High-Availability-Backup"></a>13.13.&#160;Backups</h2></div></div></div><p>In order to protect the entire cluster from some cataclysms which might destroy all cluster nodes,
-    backups of the Master store should be taken on a regular basis.</p><p>Qpid Broker distribution includes the "hot" backup utility <span class="emphasis"><em>backup.sh</em></span> which can be found at broker bin folder.
-         This utility can perform the backup when broker is running.</p><p><span class="emphasis"><em>backup.sh</em></span> script invokes <code class="classname">org.apache.qpid.server.store.berkeleydb.BDBBackup</code> to do the job.</p><p>You can also run this class from command line like in an example below:</p><div class="example"><a id="idm140218886157056"></a><p class="title"><strong>Example&#160;13.5.&#160;Performing store backup by using <code class="classname">BDBBackup</code> class directly</strong></p><div class="example-contents"><span class="command"><strong>
-        java -cp qpid-bdbstore-0.18.jar org.apache.qpid.server.store.berkeleydb.BDBBackup -fromdir path/to/store/folder -todir path/to/backup/foldeAr</strong></span></div></div><br class="example-break" /><p>In the example above BDBBackup utility is called from qpid-bdbstore-0.18.jar to backup the store at <span class="emphasis"><em>path/to/store/folder</em></span> and copy store logs into <span class="emphasis"><em>path/to/backup/folder</em></span>.</p><p>Linux and Unix users can take advantage of <span class="emphasis"><em>backup.sh</em></span> bash script by running this script in a similar way.</p><div class="example"><a id="idm140218886153040"></a><p class="title"><strong>Example&#160;13.6.&#160;Performing store backup by using <code class="classname">backup.sh</code> bash script</strong></p><div class="example-contents"><span class="command"><strong>backup.sh -fromdir path/to/store/folder -todir path/to/backup/folder</strong></span></div></div><br class="example-break" /><div 
 class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>Do not forget to ensure that the Master store is being backed up, in the event the Node elected Master changes during
-      the lifecycle of the cluster.</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-High-Availability-Security.html">Prev</a>&#160;</td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td align="right" width="40%">&#160;<a accesskey="n" href="Java-Broker-High-Availability-MigrationFromNonHA.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">13.12.&#160;Security&#160;</td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%">&#160;13.14.&#160;Migration of a non-HA store to HA</td></tr></table></div></div>
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-
-        <div id="-middle-content">
-          <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">13.7.&#160;Client failover configuration</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-High-Availability-DurabilityGuarantee.html">Prev</a>&#160;</td><th align="center" width="60%">Chapter&#160;13.&#160;High Availability</th><td align="right" width="20%">&#160;<a accesskey="n" href="Java-Broker-High-Availability-JMXAPI.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title"><a id="Java-Broker-High-Availability-ClientFailover"></a>13.7.&#160;Client failover configuration</h2></div></div></div><p>The details about format of Qpid connection URLs can be found at section
-        <a class="ulink" href="/releases/qpid-0.26/programming/book/QpidJNDI.html" target="_top">Connection URLs</a>
-        of book <a class="ulink" href="/releases/qpid-0.26/programming/book/index.html" target="_top">Programming In Apache Qpid</a>.</p><p>The failover policy option in the connection URL for the HA Cluster should be set to <span class="emphasis"><em>roundrobin</em></span>.
-      The Master broker should be put into a first place in <span class="emphasis"><em>brokerlist</em></span> URL option.
-      The recommended value for <span class="emphasis"><em>connectdelay</em></span> option in broker URL should be set to
-      the value greater than 1000 milliseconds. If it is desired that clients re-connect automatically after a
-      master to replica failure, <code class="varname">cyclecount</code> should be tuned so that the retry period is longer than
-      the expected length of time to perform the failover.</p><div class="example"><a id="idm140218886247968"></a><p class="title"><strong>Example&#160;13.2.&#160;Example of connection URL for the HA Cluster</strong></p><div class="example-contents">
-amqp://guest:guest@clientid/test?brokerlist='tcp://localhost:5672?connectdelay='2000'&amp;retries='3';tcp://localhost:5671?connectdelay='2000'&amp;retries='3';tcp://localhost:5673?connectdelay='2000'&amp;retries='3''&amp;failover='roundrobin?cyclecount='30''
-        </div></div><br class="example-break" /></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-DurabilityGuarantee.html">Prev</a>&#160;</td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td align="right" width="40%">&#160;<a accesskey="n" href="Java-Broker-High-Availability-JMXAPI.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">13.6.&#160;Durability Guarantees&#160;</td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%">&#160;13.8.&#160;Qpid JMX API for HA</td></tr></table></div></div>
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-
-        <div id="-middle-content">
-          <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">13.5.&#160;Configuring a Virtual Host to be a node</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-High-Availability-MultiNodeCluster.html">Prev</a>&#160;</td><th align="center" width="60%">Chapter&#160;13.&#160;High Availability</th><td align="right" width="20%">&#160;<a accesskey="n" href="Java-Broker-High-Availability-DurabilityGuarantee.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title"><a id="Java-Broker-High-Availability-Configuration"></a>13.5.&#160;Configuring a Virtual Host to be a node</h2></div></div></div><p>To configure a virtualhost as a cluster node, configure the virtualhost.xml in the following manner:</p><p>
-
-    </p><div class="example"><a id="idm140218886320112"></a><p class="title"><strong>Example&#160;13.1.&#160;Configuring a VirtualHost to use the BDBHAMessageStore</strong></p><div class="example-contents"><pre class="programlisting">
-&lt;virtualhosts&gt;
-  &lt;virtualhost&gt;
-    &lt;name&gt;vhostname&lt;/name&gt;
-    &lt;vhostname&gt;
-      &lt;store&gt;
-	&lt;class&gt;org.apache.qpid.server.store.berkeleydb.BDBHAMessageStore&lt;/class&gt;
-	&lt;environment-path&gt;${QPID_WORK}/bdbhastore/vhostname&lt;/environment-path&gt;
-	&lt;highAvailability&gt;
-	  &lt;groupName&gt;myclustername&lt;/groupName&gt;
-	  &lt;nodeName&gt;mynode1&lt;/nodeName&gt;
-	  &lt;nodeHostPort&gt;node1host:port&lt;/nodeHostPort&gt;
-	  &lt;helperHostPort&gt;node1host:port&lt;/helperHostPort&gt;
-	  &lt;durability&gt;NO_SYNC\,NO_SYNC\,SIMPLE_MAJORITY&lt;/durability&gt;
-	  &lt;coalescingSync&gt;true|false&lt;/coalescingSync&gt;
-	  &lt;designatedPrimary&gt;true|false&lt;/designatedPrimary&gt;
-	&lt;/highAvailability&gt;
-      &lt;/store&gt;
-      ...
-   &lt;/vhostname&gt;
-  &lt;/virtualhost&gt;
-&lt;/virtualhosts&gt;</pre></div></div><p><br class="example-break" />
-    </p><p>The <code class="varname">groupName</code> is the name of logical name of the cluster.  All nodes within the
-      cluster must use the same <code class="varname">groupName</code> in order to be considered part of the cluster.</p><p>The <code class="varname">nodeName</code> is the logical name of the node.  All nodes within the cluster must have a
-      unique name.  It is recommended that the node name should be chosen from a different nomenclature from that of
-      the servers on which they are hosted, in case the need arises to move node to a new server in the future.</p><p>The <code class="varname">nodeHostPort</code> is the hostname and port number used by this node to communicate with the
-      the other nodes in the cluster. For the hostname, an IP address, hostname or fully qualified hostname may be used.
-      For the port number, any free port can be used.  It is important that this address is stable over time, as BDB
-      records and uses this address internally.</p><p>The <code class="varname">helperHostPort</code> is the hostname and port number that new nodes use to discover other
-      nodes within the cluster when they are newly introduced to the cluster.  When configuring the first node, set the
-      <code class="varname">helperHostPort</code> to its own <code class="varname">nodeHostPort</code>.  For the second and subsequent nodes,
-      set their <code class="varname">helperHostPort</code> to that of the first node.</p><p><code class="varname">durability</code> controls the <a class="link" href="Java-Broker-High-Availability-DurabilityGuarantee.html" title="13.6.&#160;Durability Guarantees">durability</a>
-      guarantees made by the cluster. It is important that all nodes use the same value for this property. The default value is
-      NO_SYNC\,NO_SYNC\,SIMPLE_MAJORITY. Owing to the internal use of Apache Commons Config, it is currently necessary
-      to escape the commas within the durability string.</p><p><code class="varname">coalescingSync</code> controls the <a class="link" href="Java-Broker-High-Availability-DurabilityGuarantee.html#Java-Broker-High-Availability-DurabilityGuarantee_CoalescingSync" title="13.6.2.&#160;Coalescing-sync">coalescing-sync</a>
-      mode of Qpid. It is important that all nodes use the same value. If omitted, it defaults to true.</p><p>The <code class="varname">designatedPrimary</code> is applicable only to the <a class="link" href="Java-Broker-High-Availability-TwoNodeCluster.html" title="13.3.&#160;Two Node Cluster">two-node
-     case.</a>  It governs the behaviour of a node when the other node fails or becomes uncontactable.  If true,
-     the node will be designated as primary at startup and will be able to continue operating as a single node master.
-     If false, the node will transition to an unavailable state until a third-party manually designates the node as
-     primary or the other node is restored. It is suggested that the node that normally fulfils the role of master is
-     set true in config file and the node that is normally replica is set false.  Be aware that setting both nodes to
-     true will lead to a failure to start up, as both cannot be designated at the point of contact. Designating both
-     nodes as primary at runtime (using the JMX interface) will lead to a <a class="link" href="Java-Broker-High-Availability-TwoNodeCluster.html#Java-Broker-High-Availability-TwoNodeSplitBrain" title="13.3.2.5.&#160;Split Brain">split-brain</a>
-     in the case of network partition and must be avoided.</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>Usage of domain names in  <code class="varname">helperHostPort</code> and <code class="varname">nodeHostPort</code> is more preferebale
-     over IP addresses due to the tendency of more frequent changes of the last over the former.
-     If server IP address changes but domain name remains the same the HA cluster can continue working as normal
-     in case when domain names are used in cluster configuration. In case when IP addresses are used and they are changed with the time
-     than Qpid <a class="link" href="Java-Broker-High-Availability-JMXAPI.html" title="13.8.&#160;Qpid JMX API for HA">JMX API for HA</a> can be used to change the addresses or remove the nodes from the cluster.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-High-Availability-Configuration_BDBEnvVars"></a>13.5.1.&#160;Passing BDB environment and replication configuration options</h3></div></div></div><p>It is possible to pass BDB <a class="ulink" href="http://docs.oracle.com/cd/E17277_02/html/java/com/sleepycat/je/EnvironmentConfig.html" target="_top">environment</a> and
-        <a class="ulink" href="http://docs.oracle.com/cd/E17277_02/html/java/com/sleepycat/je/rep/ReplicationConfig.html" target="_top">replication</a> configuration options from the
-        virtualhost.xml.</p><p>Environment configuration options are passed as described in <a class="xref" href="Java-Broker-Stores-BDB-Store-Configuration.html#Java-Broker-Stores-BDB-Store-Configuration_BDBEnvVars" title="14.4.1.&#160;Passing BDB environment configuration options">Section&#160;14.4.1, &#8220;Passing BDB environment configuration options&#8221;</a></p><p>Replication configuration option are passed using <code class="varname">repConfig</code> elements with the <code class="varname">store</code> element.</p><p>For example, to override the BDB replication configuration option <code class="varname">je.rep.electionsPrimaryRetries</code>.</p><pre class="programlisting">
-         ...
-      &lt;/highAvailability&gt;
-      ...
-      &lt;repConfig&gt;
-        &lt;name&gt;je.rep.electionsPrimaryRetries&lt;/name&gt;
-        &lt;value&gt;3&lt;/value&gt;
-      &lt;/repConfig&gt;
-      ...
-    &lt;/store&gt;</pre></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-MultiNodeCluster.html">Prev</a>&#160;</td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td align="right" width="40%">&#160;<a accesskey="n" href="Java-Broker-High-Availability-DurabilityGuarantee.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">13.4.&#160;Multi Node Cluster&#160;</td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%">&#160;13.6.&#160;Durability Guarantees</td></tr></table></div></div>
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-          <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">13.15.&#160;Disaster Recovery</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-High-Availability-MigrationFromNonHA.html">Prev</a>&#160;</td><th align="center" width="60%">Chapter&#160;13.&#160;High Availability</th><td align="right" width="20%">&#160;<a accesskey="n" href="Java-Broker-High-Availability-Performance.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title"><a id="Java-Broker-High-Availability-DisasterRecovery"></a>13.15.&#160;Disaster Recovery</h2></div></div></div><p>This section describes the steps required to restore HA broker cluster from backup.</p><p>The detailed instructions how to perform backup on replicated environment can be found <a class="link" href="Java-Broker-High-Availability-Backup.html" title="13.13.&#160;Backups">here</a>.</p><p
 >At this point we assume that backups are collected on regular basis from Master node.</p><p>Replication configuration of a cluster is stored internally in HA message store.
-    This information includes IP addresses of the nodes.
-    In case when HA message store needs to be restored on a different host with a different IP address
-    the cluster replication configuration should be reseted in this case</p><p>Oracle provides a command line utility <a class="ulink" href="http://docs.oracle.com/cd/E17277_02/html/java/com/sleepycat/je/rep/util/DbResetRepGroup.html" target="_top"><code class="classname">DbResetRepGroup</code></a>
-    to reset the members of a replication group and replace the group with a new group consisting of a single new member
-    as described by the arguments supplied to the utility</p><p>Cluster can be restored with the following steps:</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>Copy log files into the store folder from backup</p></li><li class="listitem"><p>Use <code class="classname">DbResetRepGroup</code> to reset an existing environment. See an example below</p><div class="example"><a id="idm140218886130368"></a><p class="title"><strong>Example&#160;13.9.&#160;Reseting of replication group with <code class="classname">DbResetRepGroup</code></strong></p><div class="example-contents"><span class="command"><strong>
-java -cp je-5.0.97.jar com.sleepycat.je.rep.util.DbResetRepGroup -h ha-work/Node-5001/bdbstore -groupName TestClusterGroup -nodeName Node-5001 -nodeHostPort localhost:5001</strong></span></div></div><br class="example-break" /><p>In the example above <code class="classname">DbResetRepGroup</code> utility from Berkeley JE of version 5.0.97 is used to reset the store
-            at location <span class="emphasis"><em>ha-work/Node-5001/bdbstore</em></span> and set a replication group to <span class="emphasis"><em>TestClusterGroup</em></span>
-            having a node <span class="emphasis"><em>Node-5001</em></span> which runs at <span class="emphasis"><em>localhost:5001</em></span>.</p></li><li class="listitem"><p>Start a broker with HA store configured as specified on running of <code class="classname">DbResetRepGroup</code> utility.</p></li><li class="listitem"><p>Start replica nodes having the same replication group and a helper host port pointing to a new master. The store content will be copied into Replicas from Master on their start up.</p></li></ul></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-MigrationFromNonHA.html">Prev</a>&#160;</td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td align="right" width="40%">&#160;<a accesskey="n" href="Java-Broker-High-Availability-Performance.html">Next</a></td></tr><tr><td align="left" valign
 ="top" width="40%">13.14.&#160;Migration of a non-HA store to HA&#160;</td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%">&#160;13.16.&#160;Performance</td></tr></table></div></div>
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-          <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">13.10.&#160;Disk space requirements</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-High-Availability-Monitoring-cluster.html">Prev</a>&#160;</td><th align="center" width="60%">Chapter&#160;13.&#160;High Availability</th><td align="right" width="20%">&#160;<a accesskey="n" href="Java-Broker-High-Availability-Network-Requirements.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title"><a id="Java-Broker-High-Availability-DiskSpace"></a>13.10.&#160;Disk space requirements</h2></div></div></div><p>Disk space is a critical resource for the HA Qpid broker.</p><p>In case when a Replica goes down (or falls behind the Master in 2 node cluster where the Master is designated primary)
-    and the Master continues running, the non-replicated store files are kept on the Masters disk for the period of time
-    as specified in <span class="emphasis"><em>je.rep.repStreamTimeout</em></span> JE setting in order to replicate this data later
-    when the Replica is back. This setting is set to 1 hour by default by the broker. The setting can be overridden as described in
-    <a class="xref" href="Java-Broker-High-Availability-Configuration.html#Java-Broker-High-Availability-Configuration_BDBEnvVars" title="13.5.1.&#160;Passing BDB environment and replication configuration options">Section&#160;13.5.1, &#8220;Passing BDB environment and replication configuration options&#8221;</a>.</p><p>Depending from the application publishing/consuming rates and message sizes,
-    the disk space might become overfull during this period of time due to preserved logs.
-    Please, make sure to allocate enough space on your disk to avoid this from happening.
-    </p></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-Monitoring-cluster.html">Prev</a>&#160;</td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td align="right" width="40%">&#160;<a accesskey="n" href="Java-Broker-High-Availability-Network-Requirements.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">13.9.&#160;Monitoring cluster&#160;</td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%">&#160;13.11.&#160;Network Requirements</td></tr></table></div></div>
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-          <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">13.6.&#160;Durability Guarantees</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-High-Availability-Configuration.html">Prev</a>&#160;</td><th align="center" width="60%">Chapter&#160;13.&#160;High Availability</th><td align="right" width="20%">&#160;<a accesskey="n" href="Java-Broker-High-Availability-ClientFailover.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title"><a id="Java-Broker-High-Availability-DurabilityGuarantee"></a>13.6.&#160;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"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-High-Availability-DurabilityGuarantee_BDBControls"></a>13.6.1.&#160;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="13.6.2.&#160;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"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-High-Availability-DurabilityGuarantee_CoalescingSync"></a>13.6.2.&#160;Coalescing-sync</h3></div></div></div><p>If enabled (the default) Qpid works to reduce the number of separate
-        <a class="ulink" href="http://docs.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"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-High-Availability-DurabilityGuarantee_Default"></a>13.6.3.&#160;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"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-High-Availability-DurabilityGuarantee_Examples"></a>13.6.4.&#160;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 id="idm140218886268976"></a><p class="title"><strong>Table&#160;13.1.&#160;Effect of different durability guarantees</strong></p><div class="table-contents"><table border="1" summary="Effect of different durability guarantees"><colgroup><col /><col /><col /><col /></colgroup><thead><tr><th>&#160;</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 class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-High-Availability-Configuration.html">Prev</a>&#160;</td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td align="right" width="40%">&#160;<a accesskey="n" href="Java-Broker-High-Availability-ClientFailover.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">13.5.&#160;Configuring a Virtual Host to be a node&#160;</td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%">&#160;13.7.&#160;Client failover configuration</td></tr></table></div></div>
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