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Auflistung nach Autor:in "Fetzer, Christof"

1 - 4 von 4
  • Konferenzbeitrag
    FASTLane: Software transactional memory optimized for low numbers of threads
    (Software Engineering 2014, 2014) Wamhoff, Jons-Tobias; Rivière; Muller, Gilles; Fetzer, Christof; Felber, Pascal
  • Konferenzbeitrag
    Optimization of continuous queries in federated database and stream processing systems
    (Datenbanksysteme für Business, Technologie und Web (BTW 2015), 2015) Ji, Yuanzhen; Jerzak, Zbigniew; Nica, Anisoara; Hackenbroich, Gregor; Fetzer, Christof
    The constantly increasing number of connected devices and sensors results in increasing volume and velocity of sensor-based streaming data. Traditional approaches for processing high velocity sensor data rely on stream processing engines. However, the increasing complexity of continuous queries executed on top of high velocity data has resulted in growing demand for federated systems composed of data stream processing engines and database engines. One of major challenges for such systems is to devise the optimal query execution plan to maximize the throughput of continuous queries. In this paper we present a general framework for federated database and stream processing systems, and introduce the design and implementation of a cost-based optimizer for optimizing relational continuous queries in such systems. Our optimizer uses characteristics of continuous queries and source data streams to devise an optimal placement for each operator of a continuous query. This fine level of optimization, combined with the estimation of the feasibility of query plans, allows our optimizer to devise query plans which result in 8 times higher throughput as compared to the baseline approach which uses only stream processing engines. Moreover, our experimental results showed that even for simple queries, a hybrid execution plan can result in 4 times and 1.6 times higher throughput than a pure stream processing engine plan and a pure database engine plan, respectively.
  • Zeitschriftenartikel
    PrivApprox: Privacy-Preserving Stream Analytics (Extended Abstract)
    (Informatik Spektrum: Vol. 42, No. 5, 2019) Le Quoc, Do; Beck, Martin; Bhatotia, Pramod; Chen, Ruichuan; Fetzer, Christof; Strufe, Thorsten
  • Konferenzbeitrag
    Rearchitecting DNS
    (10th International Conferenceon Innovative Internet Community Systems (I2CS) – Jubilee Edition 2010 –, 2010) Pfeifer, Gert; Fetzer, Christof; Steuer, Martin
    The Domain Name System (DNS) has been the naming service of the Internet for more than 20 years. It is the foundation of virtually all other distributed service. The deficiencies of DNS with respect to performance, availability, and reliability are well known. We want to systematically improve DNS by (1) measuring DNS performance, (2) evaluating past proposals, and (3) try to come up with a new architecture for DNS. SEDNS is a system in which we investigate various design ideas to speed up DNS requests and improve availability, reliability, and security.