The Apache ZooKeeper team is proud to announce Apache ZooKeeper version 3.1.0.

ZooKeeper is a high-performance coordination service for distributed applications. It exposes common services - such as naming, configuration management, synchronization, and group services - in a simple interface so you don't have to write them from scratch. You can use it off-the-shelf to implement consensus, group management, leader election, and presence protocols. And you can build on it for your own, specific needs.

Key features of the 3.1.0 release:
* Quota support
* BookKeeper - a system to reliably log streams of records
* JMX for server management
* many fixes, improvements, improved documentation, etc...

A bit about BookKeeper: a system to reliably log streams of records. In BookKeeper, servers are "bookies", log streams are "ledgers", and each unit of a log (aka record) is a "ledger entry". BookKeeper is designed to be reliable; bookies, the servers that store ledgers can be byzantine, which means that some subset of the bookies can fail, corrupt data, discard data, but as long as there are enough correctly behaving servers the service as a whole behaves correctly; the meta data for BookKeeper is stored in ZooKeeper.

For ZooKeeper release details and downloads, visit:

ZooKeeper 3.1.0 Release Notes are at:


The ZooKeeper Team

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