For those of you new to Apache ZooKeeper, it is a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services. To learn more about ZooKeeper, please visit the Apache ZooKeeper homepage.
As part of stabilizing Apache ZooKeeper 3.4 branch, ZooKeeper 3.4.3 has just been released. It is a bug fix release on the 3.4 branch and fixes 17 issues out of which 1 is very critical and can cause data inconsistency (ZOOKEEPER-1367). This particular issue can lead to data inconsistencies in your ZooKeeper servers. If you are currently using any of the 3.4.* releases, please make sure you upgrade to 3.4.3.
The release also includes a fix to make SASL login context names configurable (ZOOKEEPER-1373) This allows ZooKeeper to integrate well with all the Apache Hadoop releases. The release also fixes some documentation and logging issues.
Note that the release notes include changes to ZooKeeper dependencies adding slf4j-api and slf4j-log4j12 as new dependencies, which was introduced in 3.4 release branch as part of ZOOKEEPER-850.
As you might have noticed we have been marking all the previous 3.4.* releases as Alpha. After releasing several 3.4 versions (3.4.0, 3.4.1, 3.4.2), the ZooKeeper community has decided to upgrade 3.4.3 to a beta release.
As we move on to new features on trunk for a 3.5 release, we have been discussing ways to improve release testing. This was one of the important discussion points brought up during our MeetUp. As a part of the 3.5 release, the ZooKeeper community intends to focus more on testing and reliability. We look forward to more engagement from the user community to help test ZooKeeper releases and build better testing frameworks.
Thanks to everyone who contributed towards the release including our users who reported the bugs in 3.4.2.