Institut für Verteilte Systeme

Unser Institut beschäftigt sich mit Themen wie Skalierbarkeit, Zuverlässigkeit, Sicherheit und Datenschutz, Selbstorganisation und Beherrschbarkeit von Komplexität in Verteilten Systemen in einer Vielzahl von Einsatzszenarien wie Cloud-Computing oder Fahrzeug-Fahrzeug-Kommunikation.

In der Lehre decken wir das gesamte Spektrum von Rechnernetzen, über verteilte Systeme bis hin zu Sicherheit und Privacy-Schutz ab.

Unsere letzten Publikationen


Meißner, Dominik; Erb, Benjamin; Kargl, Frank; Tichy, Matthias
retro-λ: An Event-sourced Platform for Serverless Applications with Retroactive Computing Support
Proceedings of the 12th ACM International Conference on Distributed Event-Based Systems
Juni 2018
akzeptiert

Zusammenfassung: State changes over time are inherent characteristics of stateful applications. So far, there are almost no attempts to make the past application history programmatically accessible or even modifiable. This is primarily due to the complexity of temporal changes and a difficult alignment with prevalent programming primitives and persistence strategies. Retroactive computing enables powerful capabilities though, including computations and predictions of alternate application timelines, post-hoc bug fixes, or retroactive state explorations. We propose an event-driven programming model that is oriented towards serverless computing and applies retroaction to the event sourcing paradigm. Our model is deliberately restrictive, but therefore keeps the complexity of retroactive operations in check. We then introduce retro-λ, a runtime platform that implements the model and provides retroactive capabilites to its applications. While retro-λ only shows negligible performance overheads compared to similar solutions for running regular applications, it enables its users to execute retroactive computations on the application histories as part of its programming model.

Meißner, Dominik; Erb, Benjamin; Kargl, Frank
Poster: Performance Engineering in Distributed Event-sourced Systems
Proceedings of the 12th ACM International Conference on Distributed Event-Based Systems
Juni 2018
akzeptiert

Zusammenfassung: Distributed event-sourced systems adopt a fairly new architectural style for data-intensive applications that maintains the full history of the application state. However, the performance implications of such systems are not yet well explored, let alone how the performance of these systems can be improved. A central issue is the lack of systematic performance engineering approaches that take into account the specific characteristics of these systems. To address this problem, we suggest a methodology for performance engineering and performance analysis of distributed event-sourced systems based on specific measurements and subsequent, targeted optimizations. The methodology blends in well into existing software engineering processes and helps developers to identify bottlenecks and to resolve performance issues. Using our structured approach, we improved an existing event-sourced system prototype and increased its performance considerably.

Erb, Benjamin; Meißner, Dominik; Ogger, Ferdinand; Kargl, Frank
Poster: Log Pruning in Distributed Event-sourced Systems
Proceedings of the 12th ACM International Conference on Distributed Event-Based Systems
Juni 2018
akzeptiert

Zusammenfassung: Event sourcing is increasingly used and implemented in event-based systems for maintaining the evolution of application state. However, unbounded event logs are impracticable for many systems, as it is difficult to align scalability requirements and long-term runtime behavior with the corresponding storage requirements. To this end, we explore the design space of log pruning approaches suitable for event-sourced systems. Furthermore, we survey specific log pruning mechanisms for event-sourced logs. In a brief evaluation, we point out the trade-offs when applying pruning to event logs and highlight the applicability of log pruning to event-sourced systems.

Meißner, Dominik
Doctoral Symposium: Towards Time Travel in Distributed Event-sourced Systems
Proceedings of the 12th ACM International Conference on Distributed Event-Based Systems
Juni 2018
akzeptiert

Zusammenfassung: Stateful applications are based on the state they hold and how it changes over time. This history of state changes is usually discarded as the application progresses. By building on concepts from event processing and storing the application history, we envision a novel programming paradigm that supports retroaction. Retroactive computing introduces new opportunities for a developer to access and even modify an application timeline. By enabling the exploration of alternative scenarios, retroactive computing establishes powerful new ways to debug systems and introduces new approaches to solve problems. Initial work has shown the practicality and possibilities of this new programming paradigm and introduces further research questions and challenges.

Schlee, Winfried; Hall, Deborah A.; Canlon, Barbara; Cima, Rilana F. F.; de Kleine, Emile; Hauck, Franz J.; Huber, Alex; Gallus, Silvano; Kleinjung, Tobias; Kypraios, Theodore; Langguth, Berthold; Lopez-Escamez, José A.; Lugo, Alessandra; Meyer, Martin; Mielczarek, Marzena; Norena, Arnau; Pfiffner, Flurin; Pryss, Rüdiger C.; Reichert, Manfred; Requena, Teresa; Schecklmann, Martin; van Dijk, Pim; van de Heyning, Paul; Weisz, Nathan; Cederroth, Christopher R.
Innovations in doctoral training and research on Tinnitus: the European School on Interdisciplinary Tinnitus Research (ESIT) perspective
Frontiers in Aging Neuroscience, 9:447
Januar 2018
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