The deployment of server replicas of a service across an asynchronous distributed system (e.g., Internet) is a real practical challenge. This target cannot be indeed achieved by classical software replication techniques (e.g., passive and active replication) as these techniques usually rely on group communication toolkits that require server replicas to run over a partially synchronous distributed system to solve the underlying agreement problem. This paper proposes a three-tier architecture for software replication that encapsulates the need of partial synchrony in a specific software component of a mid-tier to free replicas and clients from the need of underlying partial synchrony assumptions. Then we propose how to specialize the mid-tier in order to manage active replication of server replicas.

Asynchronous Active Replication in Three-tier Distributed Systems / Baldoni, Roberto; Marchetti, C; TUCCI PIERGIOVANNI, Sara. - STAMPA. - 2002(2002), pp. 19-26. ((Intervento presentato al convegno 9th Pacific Rim International Symposium on Dependable Computing (PRDC02) tenutosi a Tsukuba City, Ibaraki, Japan nel 16-18 December 2002 [10.1109/PRDC.2002.1185614].

Asynchronous Active Replication in Three-tier Distributed Systems

BALDONI, Roberto;TUCCI PIERGIOVANNI, sara
2002

Abstract

The deployment of server replicas of a service across an asynchronous distributed system (e.g., Internet) is a real practical challenge. This target cannot be indeed achieved by classical software replication techniques (e.g., passive and active replication) as these techniques usually rely on group communication toolkits that require server replicas to run over a partially synchronous distributed system to solve the underlying agreement problem. This paper proposes a three-tier architecture for software replication that encapsulates the need of partial synchrony in a specific software component of a mid-tier to free replicas and clients from the need of underlying partial synchrony assumptions. Then we propose how to specialize the mid-tier in order to manage active replication of server replicas.
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