caa a22 4500 445830301 CHVBK 20180317145313.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s10686-011-9241-6 doi (NATIONALLICENCE)springer-10.1007/s10686-011-9241-6 Using Java for distributed computing in the Gaia satellite data processing [Elektronische Daten] [William O'Mullane, Xavier Luri, Paul Parsons, Uwe Lammers, John Hoar, Jose Hernandez] In recent years Java has matured to a stable easy-to-use language with the flexibility of an interpreter (for reflection etc.) but the performance and type checking of a compiled language. When we started using Java for astronomical applications around 1999 they were the first of their kind in astronomy. Now a great deal of astronomy software is written in Java as are many business applications. We discuss the current environment and trends concerning the language and present an actual example of scientific use of Java for high-performance distributed computing: ESA's mission Gaia. The Gaia scanning satellite will perform a galactic census of about 1,000 million objects in our galaxy. The Gaia community has chosen to write its processing software in Java. We explore the manifold reasons for choosing Java for this large science collaboration. Gaia processing is numerically complex but highly distributable, some parts being embarrassingly parallel. We describe the Gaia processing architecture and its realisation in Java. We delve into the astrometric solution which is the most advanced and most complex part of the processing. The Gaia simulator is also written in Java and is the most mature code in the system. This has been successfully running since about 2005 on the supercomputer "Marenostrum” in Barcelona. We relate experiences of using Java on a large shared machine. Finally we discuss Java, including some of its problems, for scientific computing. Springer Science+Business Media B.V., 2011 Distributed computing nationallicence Java nationallicence Astrometry nationallicence Cloud computing nationallicence Mathematics nationallicence O'Mullane William Space Robotic Exploration, European Space Astronomy Centre, Madrid, Spain aut Luri Xavier ICC-UB/IEEC, Departament d'Astronomia i Meteorologia, Universitat of Barcelona, Barcelona, Spain aut Parsons Paul The Server Labs, Madrid, Spain aut Lammers Uwe Space Robotic Exploration, European Space Astronomy Centre, Madrid, Spain aut Hoar John Space Robotic Exploration, European Space Astronomy Centre, Madrid, Spain aut Hernandez Jose Space Robotic Exploration, European Space Astronomy Centre, Madrid, Spain aut Experimental Astronomy Springer Netherlands 31/2-3(2011-10-01), 243-258 0922-6435 31:2-3<243 2011 31 10686 https://doi.org/10.1007/s10686-011-9241-6 text/html Onlinezugriff via DOI 1 brief-communication jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10686-011-9241-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- O'Mullane William Space Robotic Exploration, European Space Astronomy Centre, Madrid, Spain aut NATIONALLICENCE 700 1- Luri Xavier ICC-UB/IEEC, Departament d'Astronomia i Meteorologia, Universitat of Barcelona, Barcelona, Spain aut NATIONALLICENCE 700 1- Parsons Paul The Server Labs, Madrid, Spain aut NATIONALLICENCE 700 1- Lammers Uwe Space Robotic Exploration, European Space Astronomy Centre, Madrid, Spain aut NATIONALLICENCE 700 1- Hoar John Space Robotic Exploration, European Space Astronomy Centre, Madrid, Spain aut NATIONALLICENCE 700 1- Hernandez Jose Space Robotic Exploration, European Space Astronomy Centre, Madrid, Spain aut NATIONALLICENCE 773 0- Experimental Astronomy Springer Netherlands 31/2-3(2011-10-01), 243-258 0922-6435 31:2-3<243 2011 31 10686 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer