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+<a href="zookeeperInternals.html">ZooKeeper Internals</a>
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+<a class="dida" href="releasenotes.pdf"><img alt="PDF -icon" src="skin/images/pdfdoc.gif" class="skin"><br>
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+ PDF</a>
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+</div>
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+<h1>ZooKeeper 3.0.0 Release Notes</h1>
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+<div id="minitoc-area">
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+<ul class="minitoc">
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+<li>
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+<a href="#migration">Migration Instructions when Upgrading to 3.0.0</a>
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+<ul class="minitoc">
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+<li>
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+<a href="#migration_code">Migrating Client Code</a>
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+<ul class="minitoc">
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+<li>
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+<a href="#Java+API">Java API</a>
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+</li>
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+<li>
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+<a href="#C+API">C API</a>
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+</li>
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+</ul>
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+</li>
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+<li>
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+<a href="#migration_data">Migrating Server Data</a>
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+</li>
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+</ul>
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+</li>
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+<li>
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+<a href="#changes">Changes Since ZooKeeper 2.2.1</a>
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+</li>
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+</ul>
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+</div>
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+
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+
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+
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+
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+
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+<p>
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+These release notes include new developer and user facing incompatibilities, features, and major improvements.
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+</p>
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+
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+
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+<ul>
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+
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+<li>
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+<p>
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+<a href="#migration">Migration Instructions</a>
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+</p>
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+</li>
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+
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+<li>
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+<p>
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+<a href="#changes">Changes</a>
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+</p>
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+</li>
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+
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+</ul>
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+
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+
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+<a name="N1001B"></a><a name="migration"></a>
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+<h2 class="h3">Migration Instructions when Upgrading to 3.0.0</h2>
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+<div class="section">
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+<p>
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+
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+<em>You should only have to read this section if you are upgrading from a previous version of ZooKeeper to version 3.0.0, otw skip down to <a href="#changes">changes</a></em>
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+
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+</p>
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+<p>
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+A small number of changes in this release have resulted in non-backward compatible Zookeeper client user code and server instance data. The following instructions provide details on how to migrate code and date from version 2.2.1 to version 3.0.0.
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+</p>
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+<p>
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+Note: ZooKeeper increments the major version number (major.minor.fix) when backward incompatible changes are made to the source base. As part of the migration from SourceForge we changed the package structure (com.yahoo.zookeeper.* to org.apache.zookeeper.*) and felt it was a good time to incorporate some changes that we had been withholding. As a result the following will be required when migrating from 2.2.1 to 3.0.0 version of ZooKeeper.
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+</p>
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+<ul>
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+
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+<li>
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+<p>
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+<a href="#migration_code">Migrating Client Code</a>
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+</p>
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+</li>
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+
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+<li>
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+<p>
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+<a href="#migration_data">Migrating Server Data</a>
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+</p>
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+</li>
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+
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+</ul>
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+<a name="N1003F"></a><a name="migration_code"></a>
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+<h3 class="h4">Migrating Client Code</h3>
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+<a name="N10045"></a><a name="Java+API"></a>
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+<h4>Java API</h4>
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+<ol>
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+
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+<li>
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+<p>The java package structure has changed from <strong>com.yahoo.zookeeper*</strong> to <strong>org.apache.zookeeper*</strong>. This will probably effect all of your java code which makes use of ZooKeeper APIs (typically import statements)</p>
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+</li>
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+
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+<li>
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+<p>A number of constants used in the client ZooKeeper API were re-specified using enums (rather than ints). See <a href="https://issues.apache.org/jira/browse/ZOOKEEPER-7">ZOOKEEPER-7</a>, <a href="https://issues.apache.org/jira/browse/ZOOKEEPER-132">ZOOKEEPER-132</a> and <a href="https://issues.apache.org/jira/browse/ZOOKEEPER-139">ZOOKEEPER-139</a> for full details</p>
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+</li>
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+
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+<li>
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+<p>
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+<a href="https://issues.apache.org/jira/browse/ZOOKEEPER-18">ZOOKEEPER-18</a> removed KeeperStateChanged, use KeeperStateDisconnected instead</p>
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+</li>
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+
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+</ol>
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+<p>
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+Also see <a href="http://hadoop.apache.org/zookeeper/docs/current/api/index.html">the current java API</a>
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+
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+</p>
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+<a name="N10077"></a><a name="C+API"></a>
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+<h4>C API</h4>
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+<ol>
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+
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+<li>
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+<p>A number of constants used in the client ZooKeeper API were renamed in order to reduce namespace collision, see <a href="https://issues.apache.org/jira/browse/ZOOKEEPER-6">ZOOKEEPER-6</a> for full details</p>
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+</li>
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+
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+</ol>
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+<a name="N1008A"></a><a name="migration_data"></a>
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+<h3 class="h4">Migrating Server Data</h3>
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+<p>
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+The following issues resulted in changes to the on-disk data format (the snapshot and transaction log files contained within the ZK data directory) and require a migration utility to be run.
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+</p>
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+<ul>
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+
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+<li>
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+<p>
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+<a href="https://issues.apache.org/jira/browse/ZOOKEEPER-27">ZOOKEEPER-27 Unique DB identifiers for servers and clients</a>
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+</p>
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+</li>
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+
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+<li>
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+<p>
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+<a href="https://issues.apache.org/jira/browse/ZOOKEEPER-32">ZOOKEEPER-32 CRCs for ZooKeeper data</a>
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+</p>
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+</li>
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+
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+<li>
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+<p>
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+<a href="https://issues.apache.org/jira/browse/ZOOKEEPER-33">ZOOKEEPER-33 Better ACL management</a>
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+</p>
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+</li>
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+
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+<li>
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+<p>
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+<a href="https://issues.apache.org/jira/browse/ZOOKEEPER-38">ZOOKEEPER-38 headers (version+) in log/snap files</a>
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+</p>
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+</li>
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+
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+</ul>
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+<p>
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+The following must be run once, and only once, when upgrading the ZooKeeper server instances to version 3.0.0.
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+</p>
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+<ol>
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+
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+<li>
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+<p>TBD</p>
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+</li>
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+
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+</ol>
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+</div>
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+
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+
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+<a name="N100BA"></a><a name="changes"></a>
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+<h2 class="h3">Changes Since ZooKeeper 2.2.1</h2>
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+<div class="section">
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+<p>
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+Version 2.2.1 code, documentation, binaries, etc... are still accessible on <a href="http://sourceforge.net/projects/zookeeper">SourceForge</a>
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+
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+</p>
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+<table class="ForrestTable" cellspacing="1" cellpadding="4">
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+<caption>Changes Since ZooKeeper 2.2.1</caption>
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+
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+<title>Changes Since ZooKeeper 2.2.1</title>
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+
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+
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+<tr>
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+
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+<th>Issue</th>
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+ <th>Notes</th>
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+
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+</tr>
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+
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+
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+<tr>
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+
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+<td>
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+ <a href="https://issues.apache.org/jira/browse/ZOOKEEPER-1">
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+ ZOOKEEPER-1</a>
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+ </td>
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+ <td>
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+ notes, placeholder - TBD during release process
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+ </td>
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+
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+</tr>
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+
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+
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+</table>
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+</div>
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+
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+<p align="right">
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+<font size="-2"></font>
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+</p>
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+</div>
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+<!--+
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+ |end content
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+ +-->
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+<div class="clearboth"> </div>
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+</div>
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+<div id="footer">
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+<!--+
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+ |start bottomstrip
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+ +-->
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+<div class="lastmodified">
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+<script type="text/javascript"><!--
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+document.write("Last Published: " + document.lastModified);
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+// --></script>
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+</div>
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+<div class="copyright">
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+ Copyright ©
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+ 2008 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a>
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+</div>
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+<!--+
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+ |end bottomstrip
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+ +-->
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+</div>
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+</body>
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+</html>
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Patrick D. Hunt