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Time-complexity bounds on agreement problems

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The increasing complexity of signal processing algorithms has lead to the need of developing the algorithms specifications using generic software implementations that become in practice the reference implementation. This fact can be particularly observed i ...

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Refined Quorum Systems

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It is considered good distributed computing practice to devise object implementations that tolerate contention, periods of asynchrony and a large number of failures, but perform fast if few failures occur, the system is synchronous and there is no contenti ...

2007

On Collision-fast Atomic Broadcast

Rodrigo Malta Schmidt, Fernando Pedone

Atomic Broadcast, an important abstraction in dependable distributed computing, is usually implemented by many instances of the well-known consensus problem. Some asynchronous consensus algorithms achieve the optimal latency of two (message) steps but cann ...

2007

Transformations in distributed computations and applications to set agreement

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In a distributed application, high-availability of a critical online service is ensured despite failures by duplicating the vital components of the server. Whilst guaranteeing the access to the server at all times, duplication requires particular care, so ...

EPFL2006

Network Correlated Data Gathering with Explicit Communication: NP-Completeness and Algorithms

Martin Vetterli, Razvan Cristescu

We consider the problem of correlated data gathering by a network with a sink node and a tree based communication structure, where the goal is to minimize the total trans- mission cost of transporting the information collected by the nodes, to the sink nod ...

2006

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2006

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Many reliable distributed systems are consensus-based and typically operate under two modes: a fast normal mode in failure-free synchronous periods, and a slower recovery mode following asynchrony and failures. A lot of work has been devoted to optimize th ...

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A General Characterization of Indulgence (Invited Paper)

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An indulgent algorithm is a distributed algorithm that, besides tolerating process failures, also tolerates arbitrarily long periods of instability, with an unbounded number of timing and scheduling failures. In particular, no process can take any irrevoca ...

2006

How Fast can a Distributed Atomic Read be?

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We study efficient and robust implementations of an atomic read-write data structure over an asynchronous distributed message-passing system made of reader and writer processes, as well as failure prone server processes implementing the data structure. We ...

2005

Dynamic Update of Distributed Agreement Protocols

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In this paper, we address the problem of dynamic protocol update (DPU) that requires global coordination of local code replacements. We propose a novel approach to DPU. The key idea is the use of synchronization facilities of the services that get updated. ...

2005