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André Schiper

Publications associées (192)

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Database Replication Techniques: a three parameter classification

André Schiper, Matthias Wiesmann, Fernando Pedone

Data replication is an increasingly important topic as databases are more and more deployed over clusters of workstations. One of the challenges in database replication is to introduce replication without severely affecting performance. Because of this dif ...

IEEE Computer Society2000

Optimistic Active Replication

André Schiper

Replication is a powerful technique for increasing availability of a distributed service. Algorithms for replicating distributed services do however face a dilemma: they should be (1) efficient (low latency), while (2) ensuring consistency of the replicas, ...

2000

Replication of CORBA Objects

Rachid Guerraoui, André Schiper, Pascal Felber

Distributed computing is one of the major trends in the computer industry. As systems become more distributed, they also become more complex and have to deal with new kinds of problems, such as partial crashes and link failures. While many middleware archi ...

Springer2000

Understanding replication in databases and distributed systems

André Schiper, Matthias Wiesmann, Fernando Pedone

Replication is an area of interest to both distributed systems and databases. The solutions developed from these two perspectives are conceptually similar but differ in many aspects: model, assumptions, mechanisms, guarantees provided, and implementation. ...

IEEE Computer Society Technical Commitee on Distributed Processing2000

Failure Detectors: implementation issues and impact on consensus performance

André Schiper, Xavier Défago, Nicoleta Sergent

Due to their nature, distributed systems are vulnerable to failures of some of their parts. Conversely, distribution also provides a way to increase the fault tolerance of the overall system. However, achieving fault tolerance is not a simple problem and r ...

1999

Consensus in Asynchronous Distributed Systems: A Concise Guided Tour

Rachid Guerraoui, André Schiper

It is now recognized that the Consensus problem is a fundamental problem when one has to design and implement reliable asynchronous distributed systems. This chapter is on the Consensus problem. It studies Consensus in two failure models, namely, the Crash ...

Springer1999

Optimization Techniques for Replicating CORBA Objects

André Schiper, Xavier Défago

The CORBA Object Group Service (OGS) is a new CORBA service that provides support for fault-tolerance through the replication of CORBA objects. In this paper, we present several optimization techniques that are used to improve the performance of OGS. For e ...

1999

Muteness Failure Detectors: Specification and Implementation

Rachid Guerraoui, André Schiper

This paper extends the failure detector approach from crash-stop failures to muteness failures. Muteness failures are malicious failures in which a process stops sending algorithm messages, but might continue to send other messages, e.g., ``I am alive'' me ...

Sprnger1999

Replicating CORBA Objects: a marriage between active and passive replication

André Schiper, Patrick Eugster, Xavier Défago

Replication is a key mechanism for developing fault-tolerant and highly available applications. In this paper, we present a replication framework for replicating CORBA objects, that combines the active and passive replication techniques. We show how we hav ...

1999

Processing Transactions over Optimistic Atomic Broadcast Protocols

André Schiper, Fernando Pedone

Atomic broadcast primitives allow fault-tolerant cooperation between sites in adistributed system. Unfortunately, the delay incurred before a message can be delivered makes it difficult to implement high performance, scalable applications on top of atomic ...

1999