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In this paper, we address reliability issues in three-tier systems with stateless application servers. For these systems, a framework called e-Transaction has been recently proposed, which specifies a set of desirable end-to-end reliability guarantees. In this article, we propose an innovative distributed protocol providing e-Transaction guarantees in the general case of multiple, autonomous back-end...
In this paper we investigate the problem of speculative processing in a replicated transactional system layered on top of an optimistic atomic broadcast service. We consider a realistic model in which transactions' read/write sets are not known a-priori, and transactions' data access patterns may vary depending on the observed snapshot. We formalize a set of correctness and optimality properties aimed...
Multi-instance-precommit (MIP) has been recently presented as an innovative transaction management scheme in support of reliability for Atomic Transactions in multitier (e.g. Web-based) systems. With this scheme, fail-over of a previously activated transaction can be supported via simple retry logics, which do not require knowledge about whether, and on which sites, the original transaction was precommitted...
In this paper we address reliability issues in Web-based transactional systems. We are interested in the category of systems characterized by stateless application servers. For these systems, a framework called e-Transaction has been recently proposed, which specifies a set of desirable end-to-end reliability guarantees. Within this framework we propose an innovative distributed protocol providing...
Parallel invocation of edge servers within a Web infrastructure has been shown to provide benefits, in terms of system responsiveness, for both content delivery applications and non-transactional Web services. This is achieved thanks to the exploitation of path-diversity proper of multi-hop networks over the Internet, which typically reduces the likelihood of client perceived link congestion. In this...
The notion of path-diversity has been widely used in the context of content delivery networks (CDNs) to improve system responsiveness by leveraging inherent features of multi-hop networks to reduce the likelihood to incur link congestions or failures. In this work we address the issue of how to exploit path-diversity in the context of application delivery networks (ADNs), namely the evolution of CDNs...
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