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<h1>ZooKeeper 3.0.0 Release Notes</h1>
<div id="minitoc-area">
<ul class="minitoc">
<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>
<ul class="minitoc">
<li>
<a href="#Java+API">Java API</a>
</li>
<li>
<a href="#C+API">C API</a>
</li>
</ul>
</li>
<li>
<a href="#migration_data">Migrating Server Data</a>
</li>
</ul>
</li>
<li>
<a href="#changes">Changes Since ZooKeeper 2.2.1</a>
</li>
</ul>
</div>
  

<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>
  
<strong>The following must be run once, and only once, when upgrading the ZooKeeper server instances to version 3.0.0.</strong>

</p>
<div class="note">
<div class="label">Note</div>
<div class="content">
  
<p>
    The &lt;dataLogDir&gt; and &lt;dataDir&gt; directories referenced
    below are specified by the <em>dataLogDir</em>
    and <em>dataLogDir</em> specification in your
    ZooKeeper config file
    respectively. <em>dataLogDir</em> defaults to the
    value of <em>dataDir</em> if not specified explicitly
    in the ZooKeeper server config file (in which case provide the
    same directory for both parameters to the upgrade utility).
  </p>

</div>
</div>
<ol>
  
<li>
<p>Shutdown the ZooKeeper server cluster.</p>
</li>
  
<li>
<p>Backup your &lt;dataLogDir&gt; and &lt;dataDir&gt; directories</p>
</li>
  
<li>
<p>Run upgrade using</p>
    
<ul>
      
<li>
<p>
<span class="codefrag computeroutput">bin/zkServer.sh upgrade &lt;dataLogDir&gt; &lt;dataDir&gt;</span>
</p>
</li>
    
</ul>
    
<p>or</p>
    
<ul>
      
<li>
<p>
<span class="codefrag computeroutput">java -classpath pathtolog4j:pathtozookeeper.jar UpgradeMain &lt;dataLogDir&gt; &lt;dataDir&gt;</span>
</p>
</li>
    
</ul>
    
<p>where &lt;dataLogDir&gt; is the directory where all transaction logs (log.*) are stored. &lt;dataDir&gt; is the directory where all the snapshots (snapshot.*) are stored.</p>
  
</li>
  
<li>
<p>Restart the cluster. </p>
</li>
 
</ol>
<p>
 If you have any failure during the upgrade procedure keep reading to sanitize your database. 
 </p>
<p>This is how upgrade works in ZooKeeper. This will help you troubleshoot in case you have problems while upgrading</p>
<ol>

<li>
<p>Upgrade moves files from &lt;dataLogDir&gt; and &lt;dataDir&gt; to &lt;dataLogDir&gt;/version-1/ and &lt;dataDir&gt;/version-1 respectively (version-1 sub-directory is created by the upgrade utility). </p>
</li>
 
<li>
<p>Upgrade creates a new version sub-directory &lt;dataDir&gt;/version-2 and &lt;dataLogDir&gt;/version-2</p>
</li>
 
<li>
<p>Upgrade reads the old database from &lt;dataDir&gt;/version-1 and &lt;dataLogDir&gt;/version-1 into the memory and creates a new upgraded snapshot. </p>
</li>
 
<li>
<p>Upgrade writes the new database in &lt;dataDir&gt;/version-2.  </p>
</li>
 
</ol>
<p>Troubleshooting.</p>
<ol>
 
<li>
<p>In case you start ZooKeeper 3.0 without upgrading from 2.0 on a 2.0 database - the servers will start up with an empty database.
 This is because the servers assume that &lt;dataDir&gt;/version-2 and &lt;dataLogDir&gt;/version-2 will have the database to start with. Since this will be empty
 in case of no upgrade, the servers will start with an empty database. In such a case, shutdown the ZooKeeper servers, remove the version-2 directory (remember
 this will lead to loss of updates after you started 3.0.)
 and then start the upgrade procedure.</p>
</li>
 
<li>
<p>If the upgrade fails while trying to rename files into the version-1 directory, you should try and move all the files under &lt;dataDir&gt;/version-1
 and &lt;dataLogDir&gt;/version-1 to &lt;dataDir&gt; and &lt;dataLogDir&gt; respectively. Then try upgrade again.
 </p>
 
</li>
 
<li>
<p> If you do not wish to run with ZooKeeper 3.0 and prefer to run with ZooKeeper 2.0 and have already upgraded - you can run ZooKeeper 2 with 
 the &lt;dataDir&gt; and &lt;dataLogDir&gt; directories changed to &lt;dataDir&gt;/version-1 and &lt;dataLogDir&gt;/version-1. Remember that you will lose all the updates that you made after the upgrade.
</p>
</li> 
 
</ol>
</div>


<a name="N10120"></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>


</table>
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