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Dynamic Reconfiguration of Primary/Backup Clusters in Apache ZooKeeper

A paper by Alexander Shraer, Benjamin Reed, Flavio Junqueira (Yahoo) and Dahlia Malkhi (Microsoft):

Dynamically changing (reconfiguring) the membership of a replicated distributed system while preserving data consistency and system availability is a challenging problem. In this paper, we show that reconfiguration can be simplified by taking advantage of certain properties commonly provided by Primary/Backup systems. We describe a new reconfiguration protocol, recently implemented in Apache Zookeeper. It fully automates configuration changes and minimizes any interruption in service to clients while maintaining data consistency. By leveraging the properties already provided by Zookeeper our protocol is considerably simpler than state of the art.

The corresponding ZooKeeper issue has been created in 2008 and the new protocol should be part of ZooKeeper 3.5.0

Original title and link: Dynamic Reconfiguration of Primary/Backup Clusters in Apache ZooKeeper (NoSQL database©myNoSQL)