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<h1>ZooKeeper 3.0.0 Release Notes</h1>
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<li>
<a href="#migration">Migration Instructions when Upgrading to 3.0.0</a>
<ul class="minitoc">
<li>
<a href="#migration_code">Migrating Client Code</a>
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<li>
<a href="#Java+API">Java API</a>
</li>
<li>
<a href="#C+API">C API</a>
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</ul>
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<a href="#migration_data">Migrating Server Data</a>
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<a href="#changes">Changes Since ZooKeeper 2.2.1</a>
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<p>
These release notes include new developer and user facing incompatibilities, features, and major improvements.
</p>


<ul>
  
<li>
<p>
<a href="#migration">Migration Instructions</a>
</p>
</li>
  
<li>
<p>
<a href="#changes">Changes</a>
</p>
</li>

</ul>


<a name="N1001B"></a><a name="migration"></a>
<h2 class="h3">Migration Instructions when Upgrading to 3.0.0</h2>
<div class="section">
<p>

<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>

</p>
<p>
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.
</p>
<p>
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.
</p>
<ul>
  
<li>
<p>
<a href="#migration_code">Migrating Client Code</a>
</p>
</li>
  
<li>
<p>
<a href="#migration_data">Migrating Server Data</a>
</p>
</li>

</ul>
<a name="N1003F"></a><a name="migration_code"></a>
<h3 class="h4">Migrating Client Code</h3>
<a name="N10045"></a><a name="Java+API"></a>
<h4>Java API</h4>
<ol>
  
<li>
<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>
</li>
  
<li>
<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>
</li>
  
<li>
<p>
<a href="https://issues.apache.org/jira/browse/ZOOKEEPER-18">ZOOKEEPER-18</a> removed KeeperStateChanged, use KeeperStateDisconnected instead</p>
</li>

</ol>
<p>
Also see <a href="http://hadoop.apache.org/zookeeper/docs/current/api/index.html">the current java API</a>

</p>
<a name="N10077"></a><a name="C+API"></a>
<h4>C API</h4>
<ol>
  
<li>
<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>
</li>

</ol>
<a name="N1008A"></a><a name="migration_data"></a>
<h3 class="h4">Migrating Server Data</h3>
<p>
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. 
</p>
<ul>
  
<li>
<p>
<a href="https://issues.apache.org/jira/browse/ZOOKEEPER-27">ZOOKEEPER-27 Unique DB identifiers for servers and clients</a>
</p>
</li>
  
<li>
<p>
<a href="https://issues.apache.org/jira/browse/ZOOKEEPER-32">ZOOKEEPER-32 CRCs for ZooKeeper data</a>
</p>
</li>
  
<li>
<p>
<a href="https://issues.apache.org/jira/browse/ZOOKEEPER-33">ZOOKEEPER-33 Better ACL management</a>
</p>
</li>
  
<li>
<p>
<a href="https://issues.apache.org/jira/browse/ZOOKEEPER-38">ZOOKEEPER-38 headers (version+) in log/snap files</a>
</p>
</li>

</ul>
<p>
The following must be run once, and only once, when upgrading the ZooKeeper server instances to version 3.0.0.
</p>
<ol>
  
<li>
<p>TBD</p>
</li>

</ol>
</div>


<a name="N100BA"></a><a name="changes"></a>
<h2 class="h3">Changes Since ZooKeeper 2.2.1</h2>
<div class="section">
<p>
Version 2.2.1 code, documentation, binaries, etc... are still accessible on <a href="http://sourceforge.net/projects/zookeeper">SourceForge</a>

</p>
<table class="ForrestTable" cellspacing="1" cellpadding="4">
<caption>Changes Since ZooKeeper 2.2.1</caption>

<title>Changes Since ZooKeeper 2.2.1</title>


<tr>
  
<th>Issue</th>
  <th>Notes</th>

</tr>


<tr>
  
<td>
    <a href="https://issues.apache.org/jira/browse/ZOOKEEPER-1">
      ZOOKEEPER-1</a>
  </td>
  <td>
    notes, placeholder - TBD during release process
  </td>

</tr>


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