Flexible Consistency for Wide Area Peer Replication

The lack of a flexible consistency management solution hinders P2P implementation of applications involving updates, such as read-write file sharing, directory services, online auctions and wide area collaboration. Managing mutable shared data in a P2P setting requires a consistency solution that can operate efficiently over variable-quality failure-prone networks, support pervasive replication for scaling, and give peers autonomy to tune consistency to their sharing needs and resource constraints. Existing solutions lack one or more of these features. In this paper, we describe a new consistency model for P2P sharing of mutable data called composable consistency, and outline its implementation in a wide area middleware file service called Swarm1 . Composable consistency lets applications compose consistency semantics appropriate for their sharing needs by combining a small set of primitive options. Swarm implements these options efficiently to support scalable, pervasive, failur...

• Type: Conference
• Year: 2005
• Where: ICDCS
• Authors: Sai Susarla, John B. Carter
• Keywords: Composable Consistency, Composable Consistency Lets, Consistency, Distributed And Parallel Computing, ICDCS 2005