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289 lines
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HTML
289 lines
13 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>Upgrading a JE Replication Group</title>
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<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Getting Started with Berkeley DB, Java Edition High Availability Applications" />
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<link rel="up" href="administration.html" title="Chapter 7. Administration" />
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<link rel="prev" href="addremovenodes.html" title="Adding and Removing Nodes" />
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<link rel="next" href="groupreset.html" title="Resetting a Replication Group" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 12.2.7.5</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">Upgrading a JE Replication Group</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="addremovenodes.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 7. Administration</th>
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<td width="20%" align="right"> <a accesskey="n" href="groupreset.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="hotupgrade"></a>Upgrading a JE Replication Group</h2>
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</div>
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</div>
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</div>
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<div class="toc">
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<dl>
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<dt>
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<span class="sect2">
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<a href="hotupgrade.html#idp1912848">Upgrade Process</a>
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</span>
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</dt>
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<dt>
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<span class="sect2">
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<a href="hotupgrade.html#idp1949392">Things To Remember While Upgrading</a>
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</span>
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</dt>
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<dt>
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<span class="sect2">
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<a href="hotupgrade.html#idp1959392">Handling Problems While Upgrading</a>
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</span>
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</dt>
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</dl>
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</div>
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<p>
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After deploying a BDB JE HA application, you may later want to
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upgrade to a new version. Berkeley DB JE supports hot upgrade of a
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replication group, by allowing mixed version operation. That is,
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replication nodes running the newer software version can
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inter-operate with older version nodes and both can be available for
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user operations. However, in some cases, there are certain
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constraints to performing such a hot upgrade.
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</p>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="idp1912848"></a>Upgrade Process</h3>
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</div>
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</div>
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</div>
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<p>
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Each release of Berkeley DB JE is tied to a given log file
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on-disk format. Log file formats do not necessarily change
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every release. The Change Log for each release specifies
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whether the log file format has changed or not. There are
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no restrictions on upgrades across releases that use the
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same log file format. For best performance and to take
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advantage of bug fixes, ensure all nodes in a replication
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group run with the same BDB JE version during normal
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operations. Occasionally, a new release of Berkeley DB JE
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includes a log file format change. The constraints that
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apply to upgrades which introduce new log file formats are
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explained in this section.
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</p>
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<p>
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In a replication group, the Master transmits log records that
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must be read by the replicas. If a group is operating with
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mixed version nodes, the Master must be running a version of
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JE that is older than, equal to, or (by default) no more
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than one version greater than the replicas. This is required
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so that the Master can supply the replicas with a version of
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the replication stream that they can understand.
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</p>
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<p>
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Note that some releases may support online upgrades with
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replicas running versions that are more than one log file
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format version different from each other. But any such
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additional flexibility will be called out in the release
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notes.
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</p>
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<p>
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To support the versioning requirement, make sure to upgrade
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all nodes to the version with the next log file format before
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upgrading any nodes to a still later log file format. If you
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cannot meet this restriction, then a hot upgrade should be
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performed. Instead, all nodes in the replication group should
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be taken offline and upgraded before any are restarted.
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</p>
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<p>
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The recommended steps for upgrading Berkeley DB JE HA when
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log file formats have changed are as follows:
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</p>
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<div class="orderedlist">
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<ol type="1">
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<li>
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<p>
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Determine if the upgrade skips any log file format
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versions. If it has, and it is not possible to
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upgrade to the intermediate versions, then plan to
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perform an offline upgrade.
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</p>
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</li>
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<li>
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<p>
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Bring all Replicas up to date with the Master. That
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is, all Replicas must have the same environment
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content as the Master. You can ascertain this by
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using the <a class="ulink" href="../java/com/sleepycat/je/rep/util/DbGroupAdmin.html#dumpGroup()(com.sleepycat.je.rep.util.DbGroupAdmin)" target="_top">DbGroupAdmin.dumpGroup()</a> utility, or
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programmatically using the
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<a class="ulink" href="../java/com/sleepycat/je/ReplicaConsistencyPolicy.html" target="_top">ReplicaConsistencyPolicy</a>.
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</p>
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</li>
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<li>
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<p>
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Perform the following upgrade procedures on each of
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the environments that are part of the replication
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group.
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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Shut down the old version of the application.
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</p>
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</li>
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<li>
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<p>
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Install the new BDB JE jar file.
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</p>
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</li>
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<li>
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<p>
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Restart the application.
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</p>
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</li>
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</ul>
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</div>
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<p>
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Upgrade each individual data node, both Replicas and
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the Master, and restart them to join the replication
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group.
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</p>
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</li>
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</ol>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="idp1949392"></a>Things To Remember While Upgrading</h3>
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</div>
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</div>
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</div>
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<p>
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During a hot replication upgrade:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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Upgrading BDB JE 4.0 directly to BDB JE 5 and higher
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versions is prohibited. Upgrade BDB JE 4.0 to BDB JE
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4.1 first, and then upgrade BDB JE 4.1 to higher
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versions. There is no constraint if you upgrade from
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BDB JE 4.1 or later versions to a higher BDB JE
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version.
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</p>
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</li>
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</ul>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="idp1959392"></a>Handling Problems While Upgrading</h3>
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</div>
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</div>
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</div>
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<p>
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There are exceptions that you may run into during the upgrade
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process. The following exceptions may be thrown when a
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replication group node is restarted during the upgrade, and a
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ReplicatedEnvironment object is instantiated:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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<a class="ulink" href="../java/com/sleepycat/je/rep/RollbackException.html" target="_top">RollbackException</a>
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</p>
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<p>
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This exception can be thrown by a Replica when its log
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is ahead of the current Master and the Replica is
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unable to rollback without a recovery. As a
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consequence, one or more of the most recently committed
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transactions may need to be rolled back, before the
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Replica can synchronize its state with that of the
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current Master. This exception can also be thrown if
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the current Master crashes. To solve this exception
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restart the ReplicatedEnvironment with the new JE
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version.
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</p>
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</li>
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<li>
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<p>
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<a class="ulink" href="../java/com/sleepycat/je/rep/RollbackProhibitedException.html" target="_top">RollbackProhibitedException</a>
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</p>
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<p>
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During synchronization, a Replica that has a newer log,
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may have to roll back a number of committed
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tranactions. If the number of rolled back transactions
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exceeds the limit defined by <a class="ulink" href="../java/com/sleepycat/je/rep/ReplicationConfig.html#TXN_ROLLBACK_LIMIT" target="_top">TXN_ROLLBACK_LIMIT</a>, the
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Replica throws a RollbackProhibitedException. To solve
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this exception you may have to truncate logs manually
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by using DbTruncateLog and restart the
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ReplicatedEnvironment with the new JE version.
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</p>
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</li>
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<li>
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<p>
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<a class="ulink" href="../java/com/sleepycat/je/EnvironmentFailureException.html" target="_top">EnvironmentFailureException</a>
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</p>
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<p>
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EnvironmentFailureException is thrown due to log
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version incompatibility between the Master and the
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Replica. This exception is thrown with the message:
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</p>
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<p>
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"Incompatible log versions. Feeder log version: xxxx,
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Feeder JE version: xxxx, Replica log version: xxxx,
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Replica JE version: xxxx".
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</p>
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<p>
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To solve this exception restart the
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ReplicatedEnvironment with the new JE version.
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</p>
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</li>
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</ul>
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</div>
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</div>
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</div>
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<div class="navfooter">
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||
<hr />
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||
<table width="100%" summary="Navigation footer">
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||
<tr>
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||
<td width="40%" align="left"><a accesskey="p" href="addremovenodes.html">Prev</a> </td>
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||
<td width="20%" align="center">
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<a accesskey="u" href="administration.html">Up</a>
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||
</td>
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||
<td width="40%" align="right"> <a accesskey="n" href="groupreset.html">Next</a></td>
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||
</tr>
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||
<tr>
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<td width="40%" align="left" valign="top">Adding and Removing Nodes </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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||
</td>
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<td width="40%" align="right" valign="top"> Resetting a Replication Group</td>
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</tr>
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||
</table>
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||
</div>
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</body>
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</html>
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