Dipl.-Inf. Francis Gropengießer

Technische Universität Ilmenau
Fakultät für Informatik und Automatisierung
FG Datenbanken und Informationssysteme
Postfach 100 565
D-98684 Ilmenau

Tel.: +49 (0) 3677 69 4165
FAX: +49 (0) 3677 69 4541
E-Mail: francis.gropengiesser(at)tu-ilmenau.de
Raum: Zusebau 3083

Kurze Biografie

Francis Gropengießer wurde 1982 in Nordhausen, Deutschland, geboren. Sein Diplom (M.Sc.) wurde ihm Anfang 2008 durch die Technische Universität Ilmenau, Deutschland, verliehen. Seit Anfang 2008 arbeitet er an seiner Promotion als wissenschaftlicher Mitarbeiter am Fachgebiet Datenbanken & Informationssysteme (Leitung: Prof. Dr.-Ing. habil. Kai-Uwe Sattler) der Technischen Universität Ilmenau, Deutschland.

Forschung

Cooperative transaction management for XML

Publications

2011

Francis Gropengießer, Kai-Uwe Sattler
Transactions a la carte -- Implementation and Performance Evaluation of Transactional Support on top of Amazon S3
DataCloud icw. IPDPS, Pages 1077 - 1086, 2011, Publisher IEEE Computer Society, Anchorage, Alaska
[Bibtex]
```
@Proceedings{DBIS:GroSat11,
	Author 	= {Gropengie{\ss}er, Francis and Sattler, Kai-Uwe},
	Booktitle	= {DataCloud icw. IPDPS},
	Pages	= {1077 - 1086},
	Title	= {Transactions a la carte -- Implementation and Performance Evaluation of Transactional Support on top of Amazon S3},
	Url	= {http://www.dbis.prakinf.tu-ilmenau.de/publications/files/DBIS:GroSat11.pdf},
	Year	= {2011},
	Publisher	= {IEEE Computer Society},
	Location	= {Anchorage, Alaska}
}
```
[Abstract]

Most providers of Cloud-based database services favor availability and processing performance over consistency and hence provide only limited transaction support. Guaranteeing strict consistency is left to application developers. In this paper, we present a flexible transactional framework built on top of Amazon S3. It is intended for processing structured data under consideration of user-defined ACID guarantees ranging from non-transactional data querying and updating to full transactional data processing ensuring strict ACID properties. It supports the development of Cloud-based database applications without explicitly writing code for transactions. Instead, transactional semantics are weaved-in automatically using aspect-oriented programming techniques. In this way, application developers as well as end-users profit from transactional guarantees without having to care about them.
[Download]
Francis Gropengießer, Stephan Baumann, Kai-Uwe Sattler
Cloudy Transactions: Cooperative XML Authoring on Amazon S3
BTW, Pages 307-326, 2011
[Bibtex]
```
@Inproceedings{DBIS:GroBauSat11,
	Author 	= {Gropengie{\ss}er, Francis and Baumann, Stephan and Sattler, Kai-Uwe},
	Booktitle	= {BTW},
	Pages	= {307-326},
	Title	= {Cloudy Transactions: Cooperative XML Authoring on Amazon
 S3},
	Url	= {http://www.dbis.prakinf.tu-ilmenau.de/publications/files/DBIS:GroBauSat11.pdf},
	Year	= {2011}
}
```
[Abstract]

Over the last few years cloud computing has received great attention in the research community. Customers are entitled to rent infrastructure, storage, and even software in form of services. This way they just have to pay for the actual use of these components or services. Cloud computing also comes with great opportunities for distributed design applications, which often require multiple users to work cooperatively on shared data. In order to enable cooperation, strict consistency is necessary. However, cloud storage services often provide only eventual consistency. In this paper, we propose a system that allows for strict consistent and cooperative XML authoring in distributed environments based on Amazon S3. Our solution makes use of local and distributed transactions, which are synchronized in an optimistic fashion, in order to ensure correctness. An important contribution of this paper is the evaluation of our system in a real deployment scenario upon Amazon S3. We show the strong impact of write operations to S3 on the transaction throughput. Furthermore, we show that fragmenting data increases write performance and reduces storage costs.
[Download]

2010

Francis Gropengießer, Kai-Uwe Sattler
Optimistic Synchronization of Cooperative XML Authoring Using Tunable Transaction Boundaries
DBKDA, Pages 35-40, 2010, Publisher IEEE Computer Society
[Bibtex]
```
@Inproceedings{DBIS:GroSat10,
	Author 	= {Gropengie{\ss}er, Francis and Sattler, Kai-Uwe},
	Booktitle	= {DBKDA},
	Pages	= {35-40},
	Title	= {Optimistic Synchronization of Cooperative XML Authoring
 Using Tunable Transaction Boundaries},
	Url	= {http://www.dbis.prakinf.tu-ilmenau.de/publications/files/DBIS:GroSat10.pdf},
	Year	= {2010},
	Publisher	= {IEEE Computer Society}
}
```
[Abstract]

Design applications, e.g., CAD or media production, often require multiple users to work cooperatively on shared data, e.g., XML documents. Using explicit transactions in such environments is difficult, because designers usually do not want to consider transactions or ACID. However, applying transactions in order to control visibility of changes or specify recovery units, is reasonable, but determining transaction boundaries must be transparent for the designer. For this reason we propose a novel approach for the automatic determination of transaction boundaries which considers the degree of cooperation designers want to achieve. Furthermore, we present an optimistic synchronization model based on the traditional backward oriented concurrency control (BOCC) algorithm, in order to synchronize the determined transactions in multi-user environments. It exploits the semantics of tree operations on XML data and enforces a correctness criterion weaker than serializability. As our evaluation shows, when multiple users work cooperatively on shared data, this model significantly reduces the number of transaction aborts in comparison to the traditional BOCC approach.
[Download]

2009

Jens-Oliver Fischer, Francis Gropengießer, S Brix,
Cooperative Spatial Audio Authoring: Systems Approach and Analysis of Use Cases
Audio Engineering Society Convention 126, May, 2009
[Bibtex]
```
@Inproceedings{DBIS:FisGroBri09,
	Author 	= {Fischer, Jens-Oliver and Gropengie{\ss}er, Francis and Brix, S and , },
	Booktitle	= {Audio Engineering Society Convention 126},
	Month	= {May},
	Title	= {Cooperative Spatial Audio Authoring: Systems Approach and Analysis of Use Cases},
	Url	= {http://www.aes.org/e-lib/browse.cfm?elib=14939},
	Year	= {2009}
}
```
[Abstract]

Today's audio production process is highly parallel and segregated. This is especially the case in the field of audio post production for motion pictures. The introduction of spatial audio systems like 5.1, 22.2 or Wave Field Synthesis results in even more production steps, namely the spatial authoring, to accomplish a rich experience for the audience. This paper proposes a system, which enables the audio engineers to work together on the same project. The proposed system is planned to be implemented for an existing spatial authoring software but can be utilized by any other application, which organizes its data in a tree structured way. Three major use cases, i.e. Single User, Work Space and Work Group, are introduced and analysed.
[Download]
Francis Gropengießer
Kooperatives XML-Authoring: Integration von Workgroups in Workspace-Szenarien
Grundlagen von Datenbanken, Pages 87-91, 2009, Rostock
[Bibtex]
```
@Inproceedings{DBIS:Gro09,
	Author 	= {Gropengie{\ss}er, Francis},
	Booktitle	= {Grundlagen von Datenbanken},
	Pages	= {87-91},
	Title	= {Kooperatives XML-Authoring: Integration von Workgroups in Workspace-Szenarien},
	Url	= {http://www.dbis.prakinf.tu-ilmenau.de/publications/files/DBIS:Gro09.pdf},
	Year	= {2009},
	Location	= {Rostock}
}
```
[Abstract]

Kooperatives XML-Authoring, wie es u.a. in Sounddesign-Prozessen erfolgt, findet in unterschiedlichen Systemumgebungen statt. Workgroups stellen dabei eng gekoppelte, Workspace-Szenarien hingegen lose gekoppelte Systemumgebungen dar. Für das Workgroup-Szenario haben wir in vergangenen Arbeiten bereits eine Lösung vorgeschlagen und implementiert, die einen hohen Grad an Kooperation ermöglicht. In dieser Arbeit stellen wir einen ersten Ansatz vor, wie bestehende Workgroups in Workspace-Szenarien integriert werden können. Hauptbestandteil dieses Integrationskonzepts ist ein maßgeschneidertes Versionierungssystem, welches die Synchronisierung konkurrierender Updates ermöglicht. Dieses arbeitet nicht, wie z.B. Subversion, auf der textuellen Repräsentation der XML-Daten, sondern betrachtet die Daten als Baum. Deltas zwischen verschiedenen Versionen werden aus den innerhalb einzelner Workgroups gespeicherten Transaktions-Recovery-Informationen gewonnen. Es ist daher kein aufwendiger Diff-Algorithmus notwendig. Weiterhin ermöglicht uns die Wiederverwendung der Recovery-Informationen auch Verschiebeoperationen zu unterstützen. Für die serverseitige Versionsverwaltung untersuchen wir einige ausgewählte Verfahren auf ihre Einsatztauglichkeit im Workspace-Szenario. Dabei handelt es sich um die Versionsverwaltung mit "Completed Deltas", ein referenzbasiertes Versionsmodell sowie ein Versionsstempel-Verfahren.
[Download]
Francis Gropengießer, Katja Hose, Kai-Uwe Sattler
An extended transaction model for cooperative authoring of XML data
Computer Science - R\&D, Number -1, Pages 85-100, Volume 24, 2009
[Bibtex]
```
@Article{DBIS:GroHosSat09,
	Author 	= {Gropengie{\ss}er, Francis and Hose, Katja and Sattler, Kai-Uwe},
	Journal	= {Computer Science - R{\&}D},
	Number	= {-1},
	Pages	= {85-100},
	Title	= {An extended transaction model for cooperative authoring
 of XML data},
	Url	= {http://www.dbis.prakinf.tu-ilmenau.de/publications/files/DBIS:GroHosSat09.pdf},
	Volume	= {24},
	Year	= {2009},
	DOI	= {http://dx.doi.org/10.1007/s00450-009-0097-1}
}
```
[Abstract]

In many application scenarios, for example in design or media production processes, several authors have to work cooperatively on the same project and consequently on the same data. In this context, a frequently used data format is XML. To enable cooperative authoring of shared XML graph structures, several requirements have to be fulfilled, e.g., early visibility of updates, multi-directional information flow, and processing data in parallel. Most transaction models proposed in the literature are hardly applicable in this context. In this paper, we propose a novel transaction model based on multi-level transactions and dynamic actions that meets these requirements. We describe the transaction model as well as its formal properties and discuss issues such as synchronization and logging.
[Download]
Francis Gropengießer, Katja Hose, Kai-Uwe Sattler
Ein kooperativer XMLEditor für Workgroups
BTW, Pages 600-603, 2009
[Bibtex]
```
@Inproceedings{DBIS:GroHosSat09_1,
	Author 	= {Gropengie{\ss}er, Francis and Hose, Katja and Sattler, Kai-Uwe},
	Booktitle	= {BTW},
	Pages	= {600-603},
	Title	= {Ein kooperativer XMLEditor f{\"u}r Workgroups},
	Url	= {http://www.dbis.prakinf.tu-ilmenau.de/publications/files/DBIS:GroHosSat09_1.pdf},
	Year	= {2009}
}
```
[Abstract]

In vielen Anwendungsgebieten, z.B. im Design oder in Medienproduktionsprozessen, hat sich XML als Format für den Datenaustausch etabliert. Zur Verarbeitung von XML-Daten in Mehrbenutzerumgebungen sind spezielle Werkzeuge nötig. Allerdings berücksichtigen die derzeit auf dem Markt verfügbaren Editoren nur unzureichend die Anforderungen kooperativer Arbeitsumgebungen. In dieser Arbeit wird daher ein transaktionsbasierter XML-Editor vorgestellt, der diese Anforderungen erfüllt. Er ist für den Einsatz in eng gekoppelten Systemumgebungen, auch Workgroups genannt, konzipiert. Der Editor erlaubt ein intuitives Bearbeiten von XML-Daten und macht Änderungen eines Nutzers an den Daten anderen Nutzern sehr früh zugänglich. Weiterhin ermöglicht er durch dein Einsatz eines intelligenten Sperrprotokolls einen hochgradig parallelen Arbeitsprozess.
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2008

Francis Gropengießer
Masterthesis: Sperrverfahren für kooperative Transaktionsmodelle
Ilmenau University of Technology, 2008
[Bibtex]

@Masterthesis{DBIS:Gro08,
	Author 	= {Gropengie{\ss}er, Francis},
	Institution	= {Ilmenau University of Technology},
	Title	= {Sperrverfahren f{\"u}r kooperative Transaktionsmodelle},
	Url	= {http://www.dbis.prakinf.tu-ilmenau.de/publications/files/DBIS:Gro08.pdf},
	Year	= {2008}
}

[Download]

Francis Gropengießer, Jens-Oliver Fischer
Ein Aktionsmodell füur die kooperative Bearbeitung von XML-Daten
Grundlagen von Datenbanken, Pages 41-45, 2008, Apolda
[Bibtex]
```
@Inproceedings{DBIS:GroFis08,
	Author 	= {Gropengie{\ss}er, Francis and Fischer, Jens-Oliver},
	Booktitle	= {Grundlagen von Datenbanken},
	Pages	= {41-45},
	Title	= {Ein Aktionsmodell f{\"u}ur die kooperative Bearbeitung von XML-Daten},
	Url	= {http://www.dbis.prakinf.tu-ilmenau.de/publications/files/DBIS:GroFis08.pdf},
	Year	= {2008},
	Location	= {Apolda}
}
```
[Abstract]

In vielen Anwendungsbereichen, wie z.B. im Design oder dem Medienproduktionsprozess, ist das kooperative Arbeiten mehrerer Nutzer auf einem zentralen Datenbestand unerlässlich geworden. Ein spezieller Anwendungsfall aus dem Bereich der Medienproduktion ist der Ausgangspunkt für die Betrachtungen in dieser Arbeit. Aus ihm lässt sich eine Reihe von Anforderungen ableiten. Für eine ausgewählte Menge existierender Transaktions-/Aktionsmodelle wird gezeigt, dass diese die Anforderungen nicht im vollen Maße erfüllen. In der Arbeit wird daher ein neues kooperatives Aktionsmodell vorgestellt. Die Vorteile des Modells sind die Ermöglichung eines kooperativen Arbeitsprozesses, ein voll automatisches Transaktionsrecovery, die einfache Behandlung von Konflikten, die infolge der fehlenden Serialisierbarkeit auftreten können, durch das Reset-Repeat-Prinzip sowie das Vermeiden eines nachträglichen Mischens verschiedener Versionen eines XML-Dokumentes.
[Download]
Francis Gropengießer, Kai-Uwe Sattler
An Extended Cooperative Transaction Model for XML
PIKM icw. CIKM, Pages 41-48, 2008
[Bibtex]
```
@Inproceedings{DBIS:GroSat08,
	Author 	= {Gropengie{\ss}er, Francis and Sattler, Kai-Uwe},
	Booktitle	= {PIKM icw. CIKM},
	Pages	= {41-48},
	Title	= {An Extended Cooperative Transaction Model for XML},
	Url	= {http://www.dbis.prakinf.tu-ilmenau.de/publications/files/DBIS:GroSat08.pdf},
	Year	= {2008}
}
```
[Abstract]

In many application areas, for example in design or media production processes, several authors have to work cooperatively on the same project. Thereby, a frequently used data format is XML. In this paper, we address the special requirements of cooperative working on shared XML graph structures, such as early visibility of updates, multi-directional information flow, and parallel working. Since most existing transaction models are hardly applicable, we present a novel transaction model based on multi-level transactions and dynamic actions that meets these requirements. Additional advantages of this model are appropriate concepts for transaction synchronization and resolution of conflicts.
[Download]

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