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From Patrick Hunt <ph...@apache.org>
Subject [ANNOUNCE] Apache ZooKeeper 3.1.0
Date Fri, 13 Feb 2009 21:50:47 GMT
The Apache ZooKeeper team is proud to announce Apache ZooKeeper version 

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 

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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