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<h1 class="title">Apache BookKeeper&trade; Releases</h1>
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<p>Version <strong>4.13.0</strong> is the <a href="#latest-release">latest release</a> of BookKeeper. The current <a href="#latest-stable-release">stable version</a> is <strong>4.11.1</strong>.</p>
<blockquote>
<p>You can verify your download by following these <a href="http://www.apache.org/info/verification.html">procedures</a> and using these <a href="https://www.apache.org/dist/bookkeeper/KEYS">KEYS</a>.</p>
</blockquote>
<p>If you want to download older, archived releases, they are available in the <a href="http://archive.apache.org/dist/bookkeeper/">Apache archive</a>.</p>
<h2 id="latest-release-version-4130">Latest release (version 4.13.0)</h2>
<p><a name="latest-release"></a></p>
<table>
<thead>
<tr>
<th style="text-align: left">Release</th>
<th style="text-align: left">Link</th>
<th style="text-align: left">Crypto files</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: left">Source</td>
<td style="text-align: left"><a href="https://www.apache.org/dyn/closer.lua/bookkeeper/bookkeeper-4.13.0/bookkeeper-4.13.0-src.tar.gz">bookkeeper-4.13.0-src.tar.gz</a></td>
<td style="text-align: left"><a href="https://www.apache.org/dist/bookkeeper/bookkeeper-4.13.0/bookkeeper-4.13.0-src.tar.gz.asc">asc</a>, <a href="https://www.apache.org/dist/bookkeeper/bookkeeper-4.13.0/bookkeeper-4.13.0-src.tar.gz.sha512">sha512</a></td>
</tr>
<tr>
<td style="text-align: left">Binary</td>
<td style="text-align: left"><a href="https://www.apache.org/dyn/closer.lua/bookkeeper/bookkeeper-4.13.0/bookkeeper-server-4.13.0-bin.tar.gz">bookkeeper-server-4.13.0-bin.tar.gz</a></td>
<td style="text-align: left"><a href="https://www.apache.org/dist/bookkeeper/bookkeeper-4.13.0/bookkeeper-server-4.13.0-bin.tar.gz.asc">asc</a>, <a href="https://www.apache.org/dist/bookkeeper/bookkeeper-4.13.0/bookkeeper-server-4.13.0-bin.tar.gz.sha512">sha512</a></td>
</tr>
</tbody>
</table>
<h2 id="latest-stable-release-version-4111">Latest stable release (version 4.11.1)</h2>
<p><a name="latest-stable-release"></a></p>
<table>
<thead>
<tr>
<th style="text-align: left">Release</th>
<th style="text-align: left">Link</th>
<th style="text-align: left">Crypto files</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: left">Source</td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.11.1/bookkeeper-4.11.1-src.tar.gz">bookkeeper-4.11.1-src.tar.gz</a></td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.11.1/bookkeeper-4.11.1-src.tar.gz.asc">asc</a>, <a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.11.1/bookkeeper-4.11.1-src.tar.gz.sha1">sha1</a></td>
</tr>
<tr>
<td style="text-align: left">Binary</td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.11.1/bookkeeper-server-4.11.1-bin.tar.gz">bookkeeper-server-4.11.1-bin.tar.gz</a></td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.11.1/bookkeeper-server-4.11.1-bin.tar.gz.asc">asc</a>, <a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.11.1/bookkeeper-server-4.11.1-bin.tar.gz.sha1">sha1</a></td>
</tr>
</tbody>
</table>
<h2 id="recent-releases">Recent releases</h2>
<h3 id="version-4121">Version 4.12.1</h3>
<table>
<thead>
<tr>
<th style="text-align: left">Release</th>
<th style="text-align: left">Link</th>
<th style="text-align: left">Crypto files</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: left">Source</td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.12.1/bookkeeper-4.12.1-src.tar.gz">bookkeeper-4.12.1-src.tar.gz</a></td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.12.1/bookkeeper-4.12.1-src.tar.gz.asc">asc</a>, <a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.12.1/bookkeeper-4.12.1-src.tar.gz.sha1">sha1</a></td>
</tr>
<tr>
<td style="text-align: left">Binary</td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.12.1/bookkeeper-server-4.12.1-bin.tar.gz">bookkeeper-server-4.12.1-bin.tar.gz</a></td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.12.1/bookkeeper-server-4.12.1-bin.tar.gz.asc">asc</a>, <a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.12.1/bookkeeper-server-4.12.1-bin.tar.gz.sha1">sha1</a></td>
</tr>
</tbody>
</table>
<h3 id="version-4120">Version 4.12.0</h3>
<table>
<thead>
<tr>
<th style="text-align: left">Release</th>
<th style="text-align: left">Link</th>
<th style="text-align: left">Crypto files</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: left">Source</td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.12.0/bookkeeper-4.12.0-src.tar.gz">bookkeeper-4.12.0-src.tar.gz</a></td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.12.0/bookkeeper-4.12.0-src.tar.gz.asc">asc</a>, <a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.12.0/bookkeeper-4.12.0-src.tar.gz.sha1">sha1</a></td>
</tr>
<tr>
<td style="text-align: left">Binary</td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.12.0/bookkeeper-server-4.12.0-bin.tar.gz">bookkeeper-server-4.12.0-bin.tar.gz</a></td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.12.0/bookkeeper-server-4.12.0-bin.tar.gz.asc">asc</a>, <a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.12.0/bookkeeper-server-4.12.0-bin.tar.gz.sha1">sha1</a></td>
</tr>
</tbody>
</table>
<h3 id="version-4111">Version 4.11.1</h3>
<table>
<thead>
<tr>
<th style="text-align: left">Release</th>
<th style="text-align: left">Link</th>
<th style="text-align: left">Crypto files</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: left">Source</td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.11.1/bookkeeper-4.11.1-src.tar.gz">bookkeeper-4.11.1-src.tar.gz</a></td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.11.1/bookkeeper-4.11.1-src.tar.gz.asc">asc</a>, <a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.11.1/bookkeeper-4.11.1-src.tar.gz.sha1">sha1</a></td>
</tr>
<tr>
<td style="text-align: left">Binary</td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.11.1/bookkeeper-server-4.11.1-bin.tar.gz">bookkeeper-server-4.11.1-bin.tar.gz</a></td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.11.1/bookkeeper-server-4.11.1-bin.tar.gz.asc">asc</a>, <a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.11.1/bookkeeper-server-4.11.1-bin.tar.gz.sha1">sha1</a></td>
</tr>
</tbody>
</table>
<h3 id="version-4110">Version 4.11.0</h3>
<table>
<thead>
<tr>
<th style="text-align: left">Release</th>
<th style="text-align: left">Link</th>
<th style="text-align: left">Crypto files</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: left">Source</td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.11.0/bookkeeper-4.11.0-src.tar.gz">bookkeeper-4.11.0-src.tar.gz</a></td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.11.0/bookkeeper-4.11.0-src.tar.gz.asc">asc</a>, <a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.11.0/bookkeeper-4.11.0-src.tar.gz.sha1">sha1</a></td>
</tr>
<tr>
<td style="text-align: left">Binary</td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.11.0/bookkeeper-server-4.11.0-bin.tar.gz">bookkeeper-server-4.11.0-bin.tar.gz</a></td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.11.0/bookkeeper-server-4.11.0-bin.tar.gz.asc">asc</a>, <a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.11.0/bookkeeper-server-4.11.0-bin.tar.gz.sha1">sha1</a></td>
</tr>
</tbody>
</table>
<h3 id="version-4100">Version 4.10.0</h3>
<table>
<thead>
<tr>
<th style="text-align: left">Release</th>
<th style="text-align: left">Link</th>
<th style="text-align: left">Crypto files</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: left">Source</td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.10.0/bookkeeper-4.10.0-src.tar.gz">bookkeeper-4.10.0-src.tar.gz</a></td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.10.0/bookkeeper-4.10.0-src.tar.gz.asc">asc</a>, <a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.10.0/bookkeeper-4.10.0-src.tar.gz.sha1">sha1</a></td>
</tr>
<tr>
<td style="text-align: left">Binary</td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.10.0/bookkeeper-server-4.10.0-bin.tar.gz">bookkeeper-server-4.10.0-bin.tar.gz</a></td>
<td style="text-align: left"><a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.10.0/bookkeeper-server-4.10.0-bin.tar.gz.asc">asc</a>, <a href="https://archive.apache.org/dist/bookkeeper/bookkeeper-4.10.0/bookkeeper-server-4.10.0-bin.tar.gz.sha1">sha1</a></td>
</tr>
</tbody>
</table>
<h2 id="getting-started">Getting Started</h2>
<p>Once you’ve downloaded a BookKeeper release, instructions on getting up and running with a standalone cluster that you can run your laptop can be found
in <a href="/docs/latest/getting-started/run-locally">Run BookKeeper locally</a>.</p>
<p>If you need to connect to an existing BookKeeper cluster using an officially supported client, see client docs for these languages:</p>
<table>
<thead>
<tr>
<th style="text-align: left">Client Guide</th>
<th style="text-align: left">API docs</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: left"><a href="/docs/latest/api/ledger-api">The BookKeeper Client</a></td>
<td style="text-align: left"><a href="/docs/latest/api/javadoc">Javadoc</a></td>
</tr>
<tr>
<td style="text-align: left"><a href="/docs/latest/api/distributedlog-api">The DistributedLog Library</a></td>
<td style="text-align: left"><a href="https://distributedlog.io/docs/latest/api/java">Javadoc</a></td>
</tr>
</tbody>
</table>
<h2 id="news">News</h2>
<h3 id="25-february-2021-release-4130-available">25 February, 2021 Release 4.13.0 available</h3>
<p>This is the 25th release of Apache BookKeeper !
See <a href="../docs/4.13.0/overview/releaseNotes">BookKeeper 4.13.0 Release Notes</a> for details.</p>
<h3 id="11-january-2021-release-4121-available">11 January, 2021 Release 4.12.1 available</h3>
<p>This is the 24th release of Apache BookKeeper !</p>
<p>See <a href="../docs/4.12.1/overview/releaseNotes">BookKeeper 4.12.1 Release Notes</a> for details.</p>
<h3 id="11-november-2020-release-4120-available">11 November, 2020 Release 4.12.0 available</h3>
<p>This is the 23th release of Apache BookKeeper !</p>
<p>See <a href="../docs/4.12.0/overview/releaseNotes">BookKeeper 4.12.0 Release Notes</a> for details.</p>
<h3 id="20-october-2020-release-4111-available">20 October, 2020 Release 4.11.1 available</h3>
<p>This is the 22th release of Apache BookKeeper !</p>
<p>See <a href="../docs/4.11.1/overview/releaseNotes">BookKeeper 4.11.1 Release Notes</a> for details.</p>
<h3 id="10-july-2020--release-4110-available">10 July, 2020 Release 4.11.0 available</h3>
<p>This is the 21th release of Apache BookKeeper !</p>
<p>See <a href="../docs/4.11.0/overview/releaseNotes">BookKeeper 4.11.0 Release Notes</a> for details.</p>
<h3 id="6-november-2019-release-4100-available">6 November, 2019 Release 4.10.0 available</h3>
<p>This is the 20th release of Apache BookKeeper!</p>
<p>The 4.10.0 release incorporates hundreds of bug fixes, improvements, and features since previous major release, 4.9.0.</p>
<p>See <a href="../docs/4.10.0/overview/releaseNotes">BookKeeper 4.10.0 Release Notes</a> for details.</p>
<h3 id="16-may-2019-release-492-available">16 May, 2019 Release 4.9.2 available</h3>
<p>This is the 19th release of Apache BookKeeper !</p>
<p>The 4.9.2 release is a bugfix release which fixes a couple of issues reported from users of 4.9.1.</p>
<p>See <a href="../docs/4.9.2/overview/releaseNotes">BookKeeper 4.9.2 Release Notes</a> for details.</p>
<h3 id="7-april-2019-release-491-available">7 April, 2019 Release 4.9.1 available</h3>
<p>This is the 18th release of Apache BookKeeper !</p>
<p>The 4.9.1 release is a bugfix release which fixes a couple of issues reported from users of 4.9.0.</p>
<p>See <a href="../docs/4.9.1/overview/releaseNotes">BookKeeper 4.9.1 Release Notes</a> for details.</p>
<h3 id="19-march-2019-release-482-available">19 March, 2019 Release 4.8.2 available</h3>
<p>This is the 17th release of Apache BookKeeper!</p>
<p>The 4.8.2 release is a bugfix release which fixes a couple of issues reported from users of 4.8.1.</p>
<p>See <a href="../docs/4.8.2/overview/releaseNotes">BookKeeper 4.8.2 Release Notes</a> for details.</p>
<h3 id="31-january-2019-release-490-available">31 January, 2019 Release 4.9.0 available</h3>
<p>This is the 16th release of Apache BookKeeper!</p>
<p>The 4.9.0 release incorporates hundreds of bug fixes, improvements, and features since previous major release, 4.8.0,
which was released four months ago. It is a new milestone in Apache BookKeeper community.</p>
<p>See <a href="../docs/4.9.0/overview/releaseNotes">BookKeeper 4.9.0 Release Notes</a> for details.</p>
<h3 id="04-december-2018-release-473-available">04 December, 2018 Release 4.7.3 available</h3>
<p>This is the 15th release of Apache BookKeeper!</p>
<p>The 4.7.3 release is a bugfix release which fixes a bunch of issues reported from users of 4.7.2.</p>
<p>See <a href="../docs/4.7.3/overview/releaseNotes">BookKeeper 4.7.3 Release Notes</a> for details.</p>
<h3 id="22-november-2018-release-481-available">22 November, 2018 Release 4.8.1 available</h3>
<p>This is the 14th release of Apache BookKeeper !</p>
<p>The 4.8.1 release is a bugfix release which fixes a bunch of issues reported from users of 4.8.0.</p>
<p>See <a href="../docs/4.8.1/overview/releaseNotes">BookKeeper 4.8.1 Release Notes</a> for details.</p>
<h3 id="26-september-2018-release-480-available">26 September, 2018 Release 4.8.0 available</h3>
<p>This is the 13th release of Apache BookKeeper !</p>
<p>The 4.8.0 release incorporates hundreds of bug fixes, improvements, and features since previous major release, 4.7.0.
It is a new big milestone in Apache BookKeeper community, this release include great new features, like Relaxed Durability, Stream Storage service and Multiple Active Entrylogs.</p>
<p>See <a href="../docs/4.8.0/overview/releaseNotes">BookKeeper 4.8.0 Release Notes</a> for details.</p>
<h3 id="29-august-2018-release-472-available">29 August, 2018: Release 4.7.2 available</h3>
<p>This is the 12th release of Apache BookKeeper!</p>
<p>The 4.7.2 release is a bugfix release which fixes a bunch of issues reported from users of 4.7.1. These fixes include
bug fixes around DbLedgerStorage, failure handling around ensemble changes, bookie shutdown and such.</p>
<p>See <a href="../docs/4.7.2/overview/releaseNotes">BookKeeper 4.7.2 Release Notes</a> for details.</p>
<h3 id="19-june-2018-release-471-available">19 June, 2018: Release 4.7.1 available</h3>
<p>This is the 11th release of Apache BookKeeper!</p>
<p>The 4.7.1 release is a bugfix release which fixes a bunch of issues reported from users of 4.7.0. These fixes include
bug fixes around ledger cache and object pooling, performance enhancement avoiding memory copies and such.</p>
<p>See <a href="../docs/4.7.1/overview/releaseNotes">BookKeeper 4.7.1 Release Notes</a> for details.</p>
<h3 id="17-april-2018-release-470-available">17 April, 2018: Release 4.7.0 available</h3>
<p>This is the 10th release of Apache BookKeeper!</p>
<p>The 4.7.0 release incorporates hundreds of bug fixes, improvements, and features since previous major release, 4.6.0,
which was released four months ago. It is a big milestone in Apache BookKeeper community - Yahoo branch is fully merged
back to upstream, and Apache Pulsar (incubating) starts using official BookKeeper release for its upcoming 2.0 release.</p>
<p>It is also the first release of Apache DistributedLog after it is merged as sub modules of Apache BookKeeper.</p>
<p>See <a href="../docs/4.7.0/overview/releaseNotes">BookKeeper 4.7.0 Release Notes</a> for details.</p>
<h3 id="9-april-2018-release-462-available">9 April, 2018: Release 4.6.2 available</h3>
<p>This is the ninth release of BookKeeper as an Apache Top Level Project!</p>
<p>The 4.6.2 release is a bugfix release.</p>
<p>See <a href="../docs/4.6.2/overview/releaseNotes">BookKeeper 4.6.2 Release Notes</a> for details.</p>
<h3 id="30-january-2018-release-461-available">30 January, 2018: Release 4.6.1 available</h3>
<p>This is the eighth release of BookKeeper as an Apache Top Level Project!</p>
<p>The 4.6.1 release is a bugfix release.</p>
<p>See <a href="../docs/4.6.1/overview/releaseNotes">BookKeeper 4.6.1 Release Notes</a> for details.</p>
<h3 id="27-december-2017-release-460-available">27 December, 2017: Release 4.6.0 available</h3>
<p>This is the seventh release of BookKeeper as an Apache Top Level Project!</p>
<p>The 4.6.0 release incorporates new fixes, improvements, and features since previous major release 4.5.0.</p>
<p>See <a href="../docs/4.6.0/overview/releaseNotes">BookKeeper 4.6.0 Release Notes</a> for details.</p>
<h3 id="22-november-2017-release-451-available">22 November, 2017: Release 4.5.1 available</h3>
<p>This is the sixth release of BookKeeper as an Apache Top Level Project!</p>
<p>The 4.5.1 release is a bugfix release.</p>
<p>See <a href="../docs/4.5.1/overview/releaseNotes">BookKeeper 4.5.1 Release Notes</a> for details.</p>
<h3 id="10-august-2017-release-450-available">10 August, 2017: Release 4.5.0 available</h3>
<p>This is the fifth release of BookKeeper as an Apache Top Level Project!</p>
<p>The 4.5.0 release incorporates hundreds of new fixes, improvements, and features since previous major release, 4.4.0,
which was released over a year ago. It is a big milestone in Apache BookKeeper community, converging from three
main branches (Salesforce, Twitter and Yahoo).</p>
<p>See <a href="../docs/4.5.0/overview/releaseNotes">BookKeeper 4.5.0 Release Notes</a> for details.</p>
<h3 id="16-may-2016-release-440-available">16 May, 2016: release 4.4.0 available</h3>
<p>This is the fourth release of BookKeeper as an Apache Top Level Project!</p>
<p>This release contains a total of 94 Jira tickets fixed and brings several bookie
reliability and operability improvements, along with a long list of bugfixes.</p>
<p>See <a href="/archives/docs/r4.4.0/releaseNotes.html">BookKeeper 4.4.0 Release Notes</a> for details.</p>
<h3 id="30-nov-2015-release-432-available">30 Nov, 2015: release 4.3.2 available</h3>
<p>This is the third release of BookKeeper as an Apache Top Level Project!</p>
<p>This release fixes some issues in both bookie server and bookkeeper client.</p>
<p>See <a href="/archives/docs/r4.3.2/releaseNotes.html">BookKeeper 4.3.2 Release Notes</a> for details.</p>
<h3 id="27-may-2015-release-431-available">27 May, 2015: release 4.3.1 available</h3>
<p>This is the second release of BookKeeper as an Apache Top Level Project!</p>
<p>This release fixes some issues in both bookie server and bookkeeper client.</p>
<p>See <a href="/archives/docs/r4.3.1/releaseNotes.html">BookKeeper 4.3.1 Release Notes</a> for details.</p>
<h3 id="16-jan-2015-release-424-available">16 Jan, 2015: release 4.2.4 available</h3>
<p>This is the first release of BookKeeper as an Apache Top Level Project!</p>
<p>This release fixes some critical issues in fencing when the ack quorum and write quorum are different sizes.</p>
<p>See <a href="/archives/docs/r4.2.4/releaseNotes.html">BookKeeper 4.2.4 Release Notes</a> for details.</p>
<h3 id="14-oct-2014-release-430-available">14 Oct, 2014: release 4.3.0 available</h3>
<p>This is the seventh release of BookKeeper as a subproject of Zookeeper.</p>
<p>This release includes a lot of improvements to the bookie on-disk performance, a new statistics framework, and protobuffer protocol support along with numerous bugfixes.</p>
<p>See <a href="/archives/docs/r4.3.0/releaseNotes.html">BookKeeper 4.3.0 Release Notes</a> for details.</p>
<h3 id="27-june-2013-release-423-available">27 June, 2013: release 4.2.3 available</h3>
<p>This is the sixth release of BookKeeper as a subproject of Zookeeper.</p>
<p>This is a bugfix release for 4.2.2.</p>
<p>Notable fixes and improvements include new utilities to give administrators better visibility of cluster state (BOOKKEEPER-746),
improvements to allow for smoother rolling upgrades (BOOKKEEPER-745),
fixes to ledger polling to ensure metadata updates aren’t missed (BOOKKEEPER-710 &amp; BOOKKEEPER-747) and shading of protobuf libraries
to avoid conflicts when included with other version (BOOKKEEPER-708).</p>
<p>See <a href="/archives/docs/r4.2.3/releaseNotes.html">BookKeeper 4.2.3 Release Notes</a> for details.</p>
<h3 id="9-oct-2013-release-422-available">9 Oct, 2013: release 4.2.2 available</h3>
<p>This is the fifth release of BookKeeper as a subproject of Zookeeper.</p>
<p>This is a bugfix release for 4.2.1. There are some minor API improvements. Notably, it is now possible to check whether a ledger is closed without opening it, and it is now possible to get a list of ledgers available in the cluster.</p>
<p>See <a href="/archives/docs/r4.2.2/releaseNotes.html">BookKeeper 4.2.2 Release Notes</a> for details.</p>
<h3 id="27-feb-2013-release-421-available">27 Feb, 2013: release 4.2.1 available</h3>
<p>This is the fourth release of BookKeeper as a subproject of Zookeeper.
<em>This release fixes a major performance bug in release 4.2.0. All users of BookKeeper 4.2.0 should upgrade immediately.</em></p>
<p>See <a href="/archives/docs/r4.2.1/releaseNotes.html">BookKeeper 4.2.1 Release Notes</a> for details.</p>
<h3 id="18-jan-2013-release-420-available">18 Jan, 2013: release 4.2.0 available</h3>
<p>This is the third release of BookKeeper as a subproject of Zookeeper.
See <a href="/archives/docs/r4.2.0/releaseNotes.html">BookKeeper 4.2.0 Release Notes</a> for details.</p>
<h3 id="12-jun-2012-release-410-available">12 Jun, 2012: release 4.1.0 available</h3>
<p>This is the second release of BookKeeper as a subproject of Zookeeper.
See <a href="/archives/docs/r4.1.0/releaseNotes.html">BookKeeper 4.1.0 Release Notes</a> for details.</p>
<h3 id="7-dec-2011-release-400-available">7 Dec, 2011: release 4.0.0 available</h3>
<p>This is the first release of BookKeeper as a subproject of Zookeeper.
See <a href="/archives/docs/r4.0.0/releaseNotes.html">BookKeeper 4.0.0 Release Notes</a> for details.</p>
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