Cloud

PaaST: Preservation as a Service for Trust

La fiducia è uno dei nodi critici dell'ambiente digitale. I documenti archiviati e gestiti nel Cloud non possono essere ritenuti affidabili usando lo stesso approccio e gli stessi strumenti del passato. PaaST (Preservation as a Service for Trust) è un progetto di ricerca sulla conservazione digitale, il cui obiettivo è la creazione di un modello per conservare i documenti digitale nel Cloud mantenendo la loro autenticità. Il modello intende definire azioni, agenti e oggetti, tutti interagenti in uno spazio non limitato ad un singolo deposito o sistema.

Elastic Symbiotic Scaling of Operators and Resources in Stream Processing Systems

Distributed stream processing frameworks are designed to perform continuous computation on possibly unbounded data streams whose rates can change over time. Devising solutions to make such systems elastically scale is a fundamental goal to achieve desired performance and cut costs caused by resource over-provisioning. These systems can be scaled along two dimensions: the operator parallelism and the number of resources. In this paper, we show how these two dimensions, as two symbiotic entities, are independent but must mutually interact for the global benefit of the system.

PASCAL: An architecture for proactive auto-scaling of distributed services

One of the main characteristics that today makes cloud services so popular is their ability to be elastic, i.e., they can adapt their provisioning to variable workloads, thus increasing resource utilization and reducing operating costs. At the core of any elastic service lies an automatic scaling mechanism that drives provisioning on the basis of a given strategy. In this paper we propose PASCAL , an architecture for Proactive Auto-SCALing of generic distributed services.

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