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Contents</strong></p><dl class="toc"><dt><span class="section"><a 
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 Introduction</a></span></dt><dt><span class="section"><a 
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file</a></span></dt><dt><span class="section"><a 
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line</a></span></dt></dl></div><div class="section"><div 
class="titlepage"><div><div><h2 class="title"><a 
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-      This section describes how to start and stop the Java Broker, and 
outlines the various command line options.
-    </p><p>
-      For additional details about the broker configuration store and related 
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-      <a class="xref" 
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colspan="3">13.13.&#160;Backups</th></tr><tr><td align="left" width="20%"><a 
accesskey="p" 
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align="center" width="60%">Chapter&#160;13.&#160;High Availability</th><td 
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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 
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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 
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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 
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width="40%">&#160;<a accesskey="n" 
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 align="left" valign="top" width="40%">13.4.&#160;Multi Node 
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width="40%">&#160;13.6.&#160;Durability Guarantees</td></tr></table></div></div>
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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 
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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 
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width="20%"><a accesskey="p" 
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 /></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" 
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cluster&#160;</td><td align="center" width="20%"><a accesskey="h" 
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width="40%">&#160;13.11.&#160;Network Requirements</td></tr></table></div></div>
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(Java)</a></li><li>13.6.&#160;Durability Guarantees</li></ul>
-
-        <div id="-middle-content">
-          <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" />
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