Title:     BookKeeper Releases
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h1. Apache BookKeeper Releases

* "Download":#download
* "Release Notes":#releasenotes
* "News":#news

h2(#download). Download

Releases may be downloaded from Apache mirrors: "Download":http://www.apache.org/dyn/closer.cgi/bookkeeper

Older releases are available in the Apache archive: "Older Releases":http://archive.apache.org/dist/bookkeeper/

h2(#releasenotes). Release Notes

Release notes for Apache BookKeeper releases are available in Jira: "Browse release notes":https://issues.apache.org/jira/browse/BOOKKEEPER?report=com.atlassian.jira.plugin.system.project:changelog-panel%3Aversions-panel

h2(#news). News

h3. 16 May, 2016: release 4.4.0 available

This is the fourth release of BookKeeper as an Apache Top Level Project!

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.

See "BookKeeper 4.4.0 Release Notes":./docs/r4.4.0/releaseNotes.html for details.

h3. 30 Nov, 2015: release 4.3.2 available

This is the third release of BookKeeper as an Apache Top Level Project!

This release fixes some issues in both bookie server and bookkeeper client.

See "BookKeeper 4.3.2 Release Notes":./docs/r4.3.2/releaseNotes.html for details.

h3. 27 May, 2015: release 4.3.1 available

This is the second release of BookKeeper as an Apache Top Level Project!

This release fixes some issues in both bookie server and bookkeeper client.

See "BookKeeper 4.3.1 Release Notes":./docs/r4.3.1/releaseNotes.html for details.

h3. 16 Jan, 2015: release 4.2.4 available

This is the first release of BookKeeper as an Apache Top Level Project!

This release fixes some critical issues in fencing when the ack quorum and write quorum are different sizes.

See "BookKeeper 4.2.4 Release Notes":./docs/r4.2.4/releaseNotes.html for details.

h3. 14 Oct, 2014: release 4.3.0 available

This is the seventh release of BookKeeper as a subproject of Zookeeper.

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.

See "BookKeeper 4.3.0 Release Notes":./docs/r4.3.0/releaseNotes.html for details.

h3. 27 June, 2013: release 4.2.3 available

This is the sixth release of BookKeeper as a subproject of Zookeeper.

This is a bugfix release for 4.2.2.

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 & BOOKKEEPER-747) and shading of protobuf libraries to avoid conflicts when included with other version (BOOKKEEPER-708).

See "BookKeeper 4.2.3 Release Notes":./docs/r4.2.3/releaseNotes.html for details.

h3. 9 Oct, 2013: release 4.2.2 available

This is the fifth release of BookKeeper as a subproject of Zookeeper.

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.

See "BookKeeper 4.2.2 Release Notes":./docs/r4.2.2/releaseNotes.html for details.

h3. 27 Feb, 2013: release 4.2.1 available

This is the fourth release of BookKeeper as a subproject of Zookeeper.
*This release fixes a major performance bug in release 4.2.0. All users of BookKeeper 4.2.0 should upgrade immediately.*
See "BookKeeper 4.2.1 Release Notes":./docs/r4.2.1/releaseNotes.html for details.

h3. 18 Jan, 2013: release 4.2.0 available

This is the third release of BookKeeper as a subproject of Zookeeper.
See "BookKeeper 4.2.0 Release Notes":./docs/r4.2.0/releaseNotes.html for details.

h3. 12 Jun, 2012: release 4.1.0 available

This is the second release of BookKeeper as a subproject of Zookeeper.
See "BookKeeper 4.1.0 Release Notes":./docs/r4.1.0/releaseNotes.html for details.

h3. 7 Dec, 2011: release 4.0.0 available

This is the first release of BookKeeper as a subproject of Zookeeper.
See "BookKeeper 4.0.0 Release Notes":./docs/r4.0.0/releaseNotes.html for details.

