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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. Introduction</h2></div></div></div><p> + 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 command line arguments see + <a class="xref" href="Java-Broker-Configuring-And-Managing.html#Java-Broker-Configuring-And-Managing-Configuration-Store" title="5.1. Broker Configuration Store">Section 5.1, “Broker Configuration Store”</a>. + The broker is fully configurable via its Web Management Console, for details of this see + <a class="xref" href="Java-Broker-Configuring-And-Managing-HTTP-Management.html#Java-Broker-Configuring-And-Managing-Web-Console" title="5.2.2. Web Management Console">Section 5.2.2, “Web Management Console”</a>. + </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-Installation-InstallationUnix.html">Prev</a> </td><td align="center" width="20%"> </td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-Getting-Started-Starting-Stopping-Windows.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">2.5. Installation on UNIX platforms </td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%"> 3.2. Starting/Stopping the broker on Windows</td></tr></table></div></div> + + <hr/> + + <ul id="-apache-navigation"> + <li><a href="http://www.apache.org/";>Apache</a></li> + <li><a href="http://www.apache.org/licenses/";>License</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> + <li><a href="http://www.apache.org/";><img id="-apache-feather" width="48" height="14" src="" alt="Apache"/></a></li> + </ul> + + <p id="-legal"> + Apache Qpid, Messaging built on AMQP; Copyright © 2015 + The Apache Software Foundation; Licensed under + the <a href="http://www.apache.org/licenses/LICENSE-2.0";>Apache + License, Version 2.0</a>; Apache Qpid, Qpid, Qpid Proton, + Proton, Apache, the Apache feather logo, and the Apache Qpid + project logo are trademarks of The Apache Software + Foundation; All other marks mentioned may be trademarks or + registered trademarks of their respective owners + </p> + </div> + </div> + </div> + </body> +</html>
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method="get"> + <input type="hidden" name="sitesearch" value="qpid.apache.org"/> + <input type="text" name="q" maxlength="255" autofocus="autofocus" tabindex="1"/> + <button type="submit">Search</button> + <a href="/search.html">More ways to search</a> + </form> + </div> + + <div id="-middle" class="panel"> + <ul id="-path-navigation"><li><a href="/index.html">Home</a></li><li><a href="/releases/index.html">Releases</a></li><li><a href="/releases/qpid-0.26/index.html">Qpid 0.26</a></li><li><a href="/releases/qpid-0.26/java-broker/book/index.html">AMQP Messaging Broker (Java)</a></li><li>13.13. Backups</li></ul> + + <div id="-middle-content"> + <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">13.13. Backups</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-High-Availability-Security.html">Prev</a> </td><th align="center" width="60%">Chapter 13. High Availability</th><td align="right" width="20%"> <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. 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 13.5. 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 13.6. 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> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-High-Availability-MigrationFromNonHA.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">13.12. Security </td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%"> 13.14. Migration of a non-HA store to HA</td></tr></table></div></div> + + <hr/> + + <ul id="-apache-navigation"> + <li><a href="http://www.apache.org/";>Apache</a></li> + <li><a href="http://www.apache.org/licenses/";>License</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> + <li><a href="http://www.apache.org/";><img id="-apache-feather" width="48" height="14" src="" alt="Apache"/></a></li> + </ul> + + <p id="-legal"> + Apache Qpid, Messaging built on AMQP; 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method="get"> + <input type="hidden" name="sitesearch" value="qpid.apache.org"/> + <input type="text" name="q" maxlength="255" autofocus="autofocus" tabindex="1"/> + <button type="submit">Search</button> + <a href="/search.html">More ways to search</a> + </form> + </div> + + <div id="-middle" class="panel"> + <ul id="-path-navigation"><li><a href="/index.html">Home</a></li><li><a href="/releases/index.html">Releases</a></li><li><a href="/releases/qpid-0.26/index.html">Qpid 0.26</a></li><li><a href="/releases/qpid-0.26/java-broker/book/index.html">AMQP Messaging Broker (Java)</a></li><li>13.7. Client failover configuration</li></ul> + + <div id="-middle-content"> + <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">13.7. Client failover configuration</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-High-Availability-DurabilityGuarantee.html">Prev</a> </td><th align="center" width="60%">Chapter 13. High Availability</th><td align="right" width="20%"> <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. 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 13.2. 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'&retries='3';tcp://localhost:5671?connectdelay='2000'&retries='3';tcp://localhost:5673?connectdelay='2000'&retries='3''&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> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-High-Availability-JMXAPI.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">13.6. Durability Guarantees </td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%"> 13.8. Qpid JMX API for HA</td></tr></table></div></div> + + <hr/> + + <ul id="-apache-navigation"> + <li><a href="http://www.apache.org/";>Apache</a></li> + <li><a href="http://www.apache.org/licenses/";>License</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> + <li><a href="http://www.apache.org/";><img id="-apache-feather" width="48" height="14" src="" alt="Apache"/></a></li> + </ul> + + <p id="-legal"> + Apache Qpid, Messaging built on AMQP; Copyright © 2015 + The Apache Software Foundation; Licensed under + the <a href="http://www.apache.org/licenses/LICENSE-2.0";>Apache + License, Version 2.0</a>; Apache Qpid, Qpid, Qpid Proton, + Proton, Apache, the Apache feather logo, and the Apache Qpid + project logo are trademarks of The Apache Software + Foundation; All other marks mentioned may be trademarks or + registered trademarks of their respective owners + </p> + </div> + </div> + </div> + </body> +</html> http://git-wip-us.apache.org/repos/asf/qpid-site/blob/a1891eca/content/releases/qpid-0.26/java-broker/book/Java-Broker-High-Availability-Configuration.html ---------------------------------------------------------------------- diff --git a/content/releases/qpid-0.26/java-broker/book/Java-Broker-High-Availability-Configuration.html b/content/releases/qpid-0.26/java-broker/book/Java-Broker-High-Availability-Configuration.html new file mode 100644 index 0000000..c7b2498 --- /dev/null +++ b/content/releases/qpid-0.26/java-broker/book/Java-Broker-High-Availability-Configuration.html @@ -0,0 +1,204 @@ +<!DOCTYPE html> +<!-- + - + - Licensed to the Apache Software Foundation (ASF) under one + - or more contributor license agreements. 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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. 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. 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. 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. 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. 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. 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. Passing BDB environment configuration options">Section 14.4.1, “Passing BDB environment configuration options”</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"> + ... + </highAvailability> + ... + <repConfig> + <name>je.rep.electionsPrimaryRetries</name> + <value>3</value> + </repConfig> + ... + </store></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> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-High-Availability-DurabilityGuarantee.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">13.4. Multi Node Cluster </td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%"> 13.6. Durability Guarantees</td></tr></table></div></div> + + <hr/> + + <ul id="-apache-navigation"> + <li><a href="http://www.apache.org/";>Apache</a></li> + <li><a href="http://www.apache.org/licenses/";>License</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> + <li><a href="http://www.apache.org/";><img id="-apache-feather" width="48" height="14" src="" alt="Apache"/></a></li> + </ul> + + <p id="-legal"> + Apache Qpid, Messaging built on AMQP; Copyright © 2015 + The Apache Software Foundation; Licensed under + the <a href="http://www.apache.org/licenses/LICENSE-2.0";>Apache + License, Version 2.0</a>; Apache Qpid, Qpid, Qpid Proton, + Proton, Apache, the Apache feather logo, and the Apache Qpid + project logo are trademarks of The Apache Software + Foundation; All other marks mentioned may be trademarks or + registered trademarks of their respective owners + </p> + </div> + </div> + </div> + </body> +</html> http://git-wip-us.apache.org/repos/asf/qpid-site/blob/a1891eca/content/releases/qpid-0.26/java-broker/book/Java-Broker-High-Availability-DisasterRecovery.html ---------------------------------------------------------------------- diff --git a/content/releases/qpid-0.26/java-broker/book/Java-Broker-High-Availability-DisasterRecovery.html b/content/releases/qpid-0.26/java-broker/book/Java-Broker-High-Availability-DisasterRecovery.html new file mode 100644 index 0000000..1cb39f3 --- /dev/null +++ b/content/releases/qpid-0.26/java-broker/book/Java-Broker-High-Availability-DisasterRecovery.html @@ -0,0 +1,152 @@ +<!DOCTYPE html> +<!-- + - + - Licensed to the Apache Software Foundation (ASF) under one + - or more contributor license agreements. 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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 13.9. 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> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-High-Availability-Performance.html">Next</a></td></tr><tr><td align="left" valign ="top" width="40%">13.14. Migration of a non-HA store to HA </td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%"> 13.16. Performance</td></tr></table></div></div> + + <hr/> + + <ul id="-apache-navigation"> + <li><a href="http://www.apache.org/";>Apache</a></li> + <li><a href="http://www.apache.org/licenses/";>License</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> + <li><a href="http://www.apache.org/";><img id="-apache-feather" width="48" height="14" src="" alt="Apache"/></a></li> + </ul> + + <p id="-legal"> + Apache Qpid, Messaging built on AMQP; Copyright © 2015 + The Apache Software Foundation; Licensed under + the <a href="http://www.apache.org/licenses/LICENSE-2.0";>Apache + License, Version 2.0</a>; Apache Qpid, Qpid, Qpid Proton, + Proton, Apache, the Apache feather logo, and the Apache Qpid + project logo are trademarks of The Apache Software + Foundation; All other marks mentioned may be trademarks or + registered trademarks of their respective owners + </p> + </div> + </div> + </div> + </body> +</html> http://git-wip-us.apache.org/repos/asf/qpid-site/blob/a1891eca/content/releases/qpid-0.26/java-broker/book/Java-Broker-High-Availability-DiskSpace.html ---------------------------------------------------------------------- diff --git a/content/releases/qpid-0.26/java-broker/book/Java-Broker-High-Availability-DiskSpace.html b/content/releases/qpid-0.26/java-broker/book/Java-Broker-High-Availability-DiskSpace.html new file mode 100644 index 0000000..ff635c9 --- /dev/null +++ b/content/releases/qpid-0.26/java-broker/book/Java-Broker-High-Availability-DiskSpace.html @@ -0,0 +1,151 @@ +<!DOCTYPE html> +<!-- + - + - Licensed to the Apache Software Foundation (ASF) under one + - or more contributor license agreements. 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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. Passing BDB environment and replication configuration options">Section 13.5.1, “Passing BDB environment and replication configuration options”</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> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td align="right" width="40%"> <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. Monitoring cluster </td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%"> 13.11. Network Requirements</td></tr></table></div></div> + + <hr/> + + <ul id="-apache-navigation"> + <li><a href="http://www.apache.org/";>Apache</a></li> + <li><a href="http://www.apache.org/licenses/";>License</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> + <li><a href="http://www.apache.org/";><img id="-apache-feather" width="48" height="14" src="" alt="Apache"/></a></li> + </ul> + + <p id="-legal"> + Apache Qpid, Messaging built on AMQP; Copyright © 2015 + The Apache Software Foundation; Licensed under + the <a href="http://www.apache.org/licenses/LICENSE-2.0";>Apache + License, Version 2.0</a>; Apache Qpid, Qpid, Qpid Proton, + Proton, Apache, the Apache feather logo, and the Apache Qpid + project logo are trademarks of The Apache Software + Foundation; All other marks mentioned may be trademarks or + registered trademarks of their respective owners + </p> + </div> + </div> + </div> + </body> +</html> http://git-wip-us.apache.org/repos/asf/qpid-site/blob/a1891eca/content/releases/qpid-0.26/java-broker/book/Java-Broker-High-Availability-DurabilityGuarantee.html ---------------------------------------------------------------------- diff --git a/content/releases/qpid-0.26/java-broker/book/Java-Broker-High-Availability-DurabilityGuarantee.html b/content/releases/qpid-0.26/java-broker/book/Java-Broker-High-Availability-DurabilityGuarantee.html new file mode 100644 index 0000000..07389b3 --- /dev/null +++ b/content/releases/qpid-0.26/java-broker/book/Java-Broker-High-Availability-DurabilityGuarantee.html @@ -0,0 +1,178 @@ +<!DOCTYPE html> +<!-- + - + - Licensed to the Apache Software Foundation (ASF) under one + - or more contributor license agreements. 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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. BDB Durability Controls</h3></div></div></div><p>BDB expresses durability as a triplet with the following form:</p><pre class="programlisting"><master sync policy>,<replica sync policy>,<replica acknowledgement policy></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. 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. 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. 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. 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 13.1. 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> </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> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-High-Availability.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-High-Availability-ClientFailover.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">13.5. Configuring a Virtual Host to be a node </td><td align="center" width="20%"><a accesskey="h" href="index.html">Home</a></td><td align="right" valign="top" width="40%"> 13.7. Client failover configuration</td></tr></table></div></div> + + <hr/> + + <ul id="-apache-navigation"> + <li><a href="http://www.apache.org/";>Apache</a></li> + <li><a href="http://www.apache.org/licenses/";>License</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> + <li><a href="http://www.apache.org/";><img id="-apache-feather" width="48" height="14" src="" alt="Apache"/></a></li> + </ul> + + <p id="-legal"> + Apache Qpid, Messaging built on AMQP; Copyright © 2015 + The Apache Software Foundation; Licensed under + the <a href="http://www.apache.org/licenses/LICENSE-2.0";>Apache + License, Version 2.0</a>; Apache Qpid, Qpid, Qpid Proton, + Proton, Apache, the Apache feather logo, and the Apache Qpid + project logo are trademarks of The Apache Software + Foundation; All other marks mentioned may be trademarks or + registered trademarks of their respective owners + </p> + </div> + </div> + </div> + </body> +</html> --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
