Apache ZooKeeper release 3.4.3 is now available. This is a bug fix release covering 18 issues, one of which was considered a blocker. 

ZooKeeper 3.4 is incorporated into CDH4 and now available in beta 1!

ZOOKEEPER-1367 is the most serious of the issues addressed, it could cause data corruption on restart. This version also adds support for compiling the client on ARM architectures.

• ZOOKEEPER-1367  Data inconsistencies and unexpired ephemeral nodes after cluster restart
• ZOOKEEPER-1343  getEpochToPropose should check if lastAcceptedEpoch is greater or equal than epoch
• ZOOKEEPER-1373  Hardcoded SASL login context name clashes with Hadoop security configuration override
• ZOOKEEPER-1089  zkServer.sh status does not work due to invalid option of nc
• ZOOKEEPER-973    bind() could fail on Leader because it does not setReuseAddress on its ServerSocket
• ZOOKEEPER-1374  C client multi-threaded test suite fails to compile on ARM architectures.
• ZOOKEEPER-1348  Zookeeper 3.4.2 C client incorrectly reports string version of 3.4.1

If you are running 3.4.2 or earlier, be sure to upgrade immediately. See my earlier post for details on what’s new in 3.4.

Stability, Compatibility and Testing

The 3.4 series has been through a number of releases, incorporating feedback from users and addressing found issues. The Apache community is now considering the 3.4.3 release to be of beta quality. 

Getting Involved

The Apache ZooKeeper project is working on a number of new features. Our How To Contribute page is a great place to start if you’re interested in getting involved as a developer. You can also follow me on twitter.

Acknowledgements

A special thanks to everyone who contributed to the release (reporting issues, fixing bugs, reviewing changes, writing documentation, etc).