Adriana Iamnitchi

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Despite recent excitement generated by the peer-to-peer (P2P) paradigm and the surprisingly rapid deployment of some P2P applications, there are few quantitative evaluations of P2P systems behavior. The open architecture, achieved scale, and self-organizing structure of the Gnutella network make it an interesting P2P architecture to study. Like most other(More)
In wide area computing systems, it is often desirable to create remote read-only copies (replicas) of files. Replication can be used to reduce access latency, improve data locality, and/or increase robustness, scalability and performance for distributed applications. We define a replica location service (RLS) as a system that maintains and provides access(More)
Peer-to-peer systems have emerged as a significant social and technical phenomenon, and they are likely to gain popularity as low-cost individual computing and storage resources become more widely available and network connectivity increases. Unlike traditional distributed systems, P2P networks aggregate large numbers of computers that join and leave the(More)
It has been reported [25] that life holds but two certainties, death and taxes. And indeed, it does appear that any society—and in the context of this article, any large-scale distributed system—must address both death (failure) and the establishment and maintenance of infrastructure (which we assert is a major motivation for taxes, so as to justify our(More)
Amazon.com has introduced the Simple Storage Service (S3), a commodity-priced storage utility. S3 aims to provide storage as a low-cost, highly available service, with a simple 'pay-as-you-go' charging model. This article makes three contributions. First, we evaluate S3's ability to provide storage support to large-scale science projects from a cost,(More)
Resource location (or discovery) is a fundamental service for resource-sharing environments: given desired resource attributes, the service returns locations of matching resources. Designing such a service for a Grid environment of the scale and volatility of today’s peer-to-peer systems is not trivial. We explore part of the design space through(More)
Efficient data sharing in global peer-to-peer systems is complicated by erratic node failure, unreliable network connectivity and limited bandwidth. Replicating data on multiple nodes can improve availability and response time. Yet determining when and where to replicate data in order to meet performance goals in large-scale systems with many users and(More)
Recent Internet applications, such as online social networks and user-generated content sharing, produce an unprecedented amount of social information, which is further augmented by location or collocation data collected from mobile phones. Unfortunately, this wealth of social information is fragmented across many different proprietary applications.(More)
Computational grids provide mechanisms for sharing and accessing large and heterogeneous collections of remote resources such as computers, online instruments, storage space, data, and applications. Resources are requested (”discovered”) by specifying a set of desired attributes. Resource attributes have various degrees of dynamism, from mostly static(More)