Tutorial

Abstract

This tutorial starts with a survey of optimizations for streaming applications. The survey is organized as a catalog that introduces uniform terminology and a common categorization of optimizations across disciplines, such as data management, programming languages, and operating systems. After this survey, the tutorial continues with a deep-dive into the fission optimization, which automatically transforms streaming applications for data-parallelism. Fission helps an application improve its throughput by taking advantage of multiple cores in a machine, or, in the case of a distributed streaming engine, multiple machines in a cluster. While the survey of optimizations covers a wide range of work from the literature, the in-depth discussion of fission relies more heavily on the presenters' own research and experience in the area. The tutorial concludes with a discussion of open research challenges in the field of stream processing optimizations.

Ecological flow in southern Europe: Status and trends in non-perennial rivers

“…In the territories of the Member States (MSs) of the European Union (EU), about 65% of the rivers are regulated by one or more dams (World Commission on Dams, 2000), which have altered the natural flow regime. Intensive water abstraction from streams and groundwater and flow regime alterations cause habitat loss and represent the main threats to biodiversity by compromising the functionality of aquatic ecosystems (Schneider et al, 2013;Postel et al, 1996). The concept of environmental flow (E-Flows) has been introduced to depict the streamflow that is necessary to maintain river ecosystems.…”