Postgres-R (8) Architecture

Postgres-R (8) Architecture.

Abstract
Tis document describes the design and architecture of Postgres-R (8), a multi-master replication system for Postgres. It is an extension of the work presented by [KA00]and incorporates enhancements from the subsequent paper Postgres-R (SI) by [WK05]. Further inspiration originates from Slony-II of Neil Conway and Gavin Sherry and from conversation with other fellow hackers of Postgres. Please note that this paper describes the underlying concept and does not necessarily reflect the status of the prototype implementation, which is available from http://www.postgres-r.org. The reader is supposed to be familiar with Postgres internals, especially with Multi-Version Concurrency Control (MVCC) and transaction isolation issues.