Conference contribution
(Original article)


Placement-Safe Operator-Graph Changes in Distributed Heterogeneous Data Stream Systems


Publication Details
Author(s): Pollner N, Steudtner CT, Meyer-Wegener K
Editor(s): Ritter N, Henrich A, Lehner W, Thor A, Friedrich S, Wingerath W
Publisher: Gesellschaft für Informatik (GI)
Publishing place: Bonn
Publication year: 2015
Title of series: Lecture Notes in Informatics (LNI) - Proceedings
Volume: P-242
Conference Proceedings Title: Datenbanksysteme für Business, Technologie und Web (BTW 2015) - Workshopband
Pages range: 61-70
ISBN: 978-3-88579-636-7
ISSN: 1617-5468

Event details
Event: DSEP@BTW 2015
Event location: Hamburg
Start date of the event: 03/03/2015
End date of the event: 03/03/2015
Language: English

Abstract

Data stream processing systems enable querying continuous data without first storing it. Data stream queries may combine data from distributed data sources like different sensors in an environmental sensing application. This suggests distributed query processing. Thus the amount of transferred data can be reduced and more processing resources are available.

However, distributed query processing on probably heterogeneous platforms complicates query optimization. This article investigates query optimization through operator graph changes and its interaction with operator placement on heterogeneous distributed systems. Pre-distribution operator graph changes may prevent certain operator placements. Thereby the resource consumption of the query execution may unexpectedly increase. Based on the operator placement problem modeled as a task assignment problem (TAP), we prove that it is NP-hard to decide in general whether an arbitrary operator graph change may negatively influence the best possible TAP solution. We present conditions for several specific operator graph changes that guarantee to preserve the best possible TAP solution.



How to cite
APA: Pollner, N., Steudtner, C.T., & Meyer-Wegener, K. (2015). Placement-Safe Operator-Graph Changes in Distributed Heterogeneous Data Stream Systems. In Ritter N, Henrich A, Lehner W, Thor A, Friedrich S, Wingerath W (Eds.), Datenbanksysteme für Business, Technologie und Web (BTW 2015) - Workshopband (pp. 61-70). Bonn: Gesellschaft für Informatik (GI).

MLA: Pollner, Niko, Christian Thomas Steudtner, and Klaus Meyer-Wegener. "Placement-Safe Operator-Graph Changes in Distributed Heterogeneous Data Stream Systems." Proceedings of the DSEP@BTW 2015, Hamburg Ed. Ritter N, Henrich A, Lehner W, Thor A, Friedrich S, Wingerath W, Bonn: Gesellschaft für Informatik (GI), 2015. 61-70.

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