Dr.-Ing. Alexander Schätzle

Albert-Ludwigs-Universität Freiburg
Technische Fakultät - Institut für Informatik
Georges-Köhler-Allee 51
79110 Freiburg i. Br., Germany
Office: 051-01-028

Email:

Phone:    +49 (761) 203-8128
Fax:         +49 (761) 203-8122
Web:        www.alexander-schaetzle.de
Profiles:   XING, LinkedIn, ResearchGate

About me

10/2004 - 09/2007: Bachelor o. Sc. in Computer Science with minor in Business Administration, University of Freiburg
10/2007 - 09/2010: Master o. Sc. in Computer Science with minor in Business Administration, University of Freiburg
10/2010 - 03/2017 PhD at the Database and Information Systems group of Prof. Dr. Lausen
10/2017 - up to now: System Architect for Big Data at badenIT GmbH

Research Interests

Semantic Web (RDF, SPARQL, ...)
Distributed Computing (Hadoop and related projects)
NoSQL Databases (Cassandra, HBase, ...)

Current Research Projects

Publications

Martin Przyjaciel-Zablocki, Alexander Schätzle, Georg Lausen:
Querying Semantic Knowledge Bases with SQL-on-Hadoop [ .pdf ]
International Workshop on Algorithms and Systems for MapReduce and Beyond (BeyondMR 2017). Chicago (USA), May 2017.
Alexander Schätzle, Martin Przyjaciel-Zablocki, Simon Skilevic, Georg Lausen:
S2RDF: RDF Querying with SPARQL on Spark [ .pdf ]
Proceedings of the VLDB Endowment (PVLDB), Volume 9, No. 10, June 2016.
42nd International Conference on Very Large Data Bases (VLDB 2016). New Delhi (India), September 2016.
Alexander Schätzle, Martin Przyjaciel-Zablocki, Simon Skilevic, Georg Lausen:
S2RDF: RDF Querying with SPARQL on Spark [ Tech. Report ]
Computing Research Repository (CoRR), December 2015.
Alexander Schätzle, Martin Przyjaciel-Zablocki, Thorsten Berberich, Georg Lausen:
S2X: Graph-Parallel Querying of RDF with GraphX [ .pdf ]
Biomedical Data Management and Graph Online Querying, VLDB 2015 Workshops (Big-O(Q) 2015) and DMAH, Revised Selected Papers, volume 9579 of Lecture Notes in Computer Science (LNCS), pages 155-168.
Hawaii (USA), August 2015.
Victor Anthony Arrascue Ayala, Anas Alzoghbi, Martin Przyjaciel-Zablocki, Alexander Schätzle, Georg Lausen:
Speeding up Collaborative Filtering with Parametrized Preprocessing [ .pdf ]
In Proc. of the 6th International Workshop on Social Recommender Systems (SRS 2015),
in conjunction with the 2015 ACM SIGKDD Conference on Knowledge Discovery and Data Mining (KDD 2015). Sydney, Australia, August 2015.
Martin Przyjaciel-Zablocki, Alexander Schätzle, Georg Lausen:
TriAL-QL: Distributed Processing of Navigational Queries [ .pdf ] (Best Paper Runner-Up Award)
Proc. of 18th International Workshop on the Web and Databases (WebDB 2015)
at SIGMOD 2015. Melbourne (Australia), May 2015.
Martin Przyjaciel-Zablocki, Alexander Schätzle, Adrian Lange:
TriAL-QL: Distributed Processing of Navigational Queries [ .pdf ]
Proc. of the 9th Alberto Mendelzon International Workshop on Foundations of Data Management (AMW 2015)
Lima (Peru), May 2015.
Peter M. Fischer, Georg Lausen, Alexander Schätzle, Michael Schmidt:
RDF Constraint Checking [ .pdf ]
Proc. of the Workshops of the EDBT/ICDT 2015 Joint Conference (CEUR).
5th International Workshop on Linked Web Data Management (LWDM 2015). Brussels (Belgium).
Alexander Schätzle, Martin Przyjaciel-Zablocki, Antony Neu, Georg Lausen:
Sempala: Interactive SPARQL Query Processing on Hadoop [ .pdf ]
Proc. of the 13th International Semantic Web Conference (ISWC 2014). Riva del Garda (Italy).
Martin Przyjaciel-Zablocki, Thomas Hornung, Alexander Schätzle, Sven Gauß, Io Taxidou, Georg Lausen:
MUSE: A Music Recommendation Management System [ .pdf ] [ Poster ]
Proc. of the 15th International Society for Music Information Retrieval Conference (ISMIR 2014). Taipei (Taiwan), October 2014
Alexander Schätzle, Martin Przyjaciel-Zablocki, Thomas Hornung, Georg Lausen:
Large-Scale RDF Processing with MapReduce [ Book ]
Large Scale and Big Data - Processing and Management 2014: 151--182. Auerbach Publications 2014
Victor Anthony Arrascue Ayala, Martin Przyjaciel-Zablocki, Thomas Hornung, Alexander Schätzle, Georg Lausen:
Extending SPARQL for Recommendations [ .pdf ]
Proc. of the 6th International Workshop on Semantic Web Information Management (SWIM 2014),
in conjunction with SIGMOD 2014. Snowbird, Utah (USA), June 2014.
Martin Przyjaciel-Zablocki, Alexander Schätzle, Eduard Skaley, Thomas Hornung, Georg Lausen:
Map-Side Merge Joins for Scalable SPARQL BGP Processing [ .pdf ]
Proc. of the 5th IEEE International Conference on Cloud Computing Technology and Science, (CloudCom 2013). Bristol (UK).
Alexander Schätzle, Martin Przyjaciel-Zablocki, Thomas Hornung, Georg Lausen:
PigSPARQL: A SPARQL Query Processing Baseline for Big Data [ .pdf ] [ Poster ]
Proc. of the ISWC 2013 Posters & Demonstrations Track (ISWC 2013). Sydney (Australia).
Thomas Hornung, Cai-Nicolas Ziegler, Simon Franz, Martin Przyjaciel-Zablocki, Alexander Schätzle, Georg Lausen:
Evaluating Hybrid Music Recommender Systems
Proc. of the 12th IEEE/WIC/ACM International Conference on Web Intelligence (WI 2013). Atlanta, GA (USA).
Simon Franz, Thomas Hornung, Cai-Nicolas Ziegler, Martin Przyjaciel-Zablocki, Alexander Schätzle, Georg Lausen:
On Weighted Hybrid Track Recommendations [ .pdf ]
Proc. of the 13th International Conference on Web Engineering (ICWE 2013). Aalborg (Denmark).
Alexander Schätzle, Antony Neu, Georg Lausen, Martin Przyjaciel-Zablocki:
Large-Scale Bisimulation of RDF Graphs [ .pdf ] (Best Paper Award)
Proc. of the Fifth Workshop on Semantic Web Information Management (SWIM 2013),
in conjunction with the 2013 ACM International Conference on Management of Data (SIGMOD 2013). New York (USA).
Martin Przyjaciel-Zablocki, Alexander Schätzle, Thomas Hornung, Io Taxidou:
Towards a SPARQL 1.1 Feature Benchmark on Real-World Social Network Data [ .pdf ]
Proc. of the First International Workshop on Benchmarking RDF Systems (BeRSys 2013),
co-located with the 10th Extended Semantic Web Conference (ESWC 2013). Montpellier (France).
Alexander Schätzle, Martin Przyjaciel-Zablocki, Christopher Dorner, Thomas Hornung, Georg Lausen:
Cascading Map-Side Joins over HBase for Scalable Join Processing [ .pdf ]
Proc. of the Joint Workshop on Scalable and High-Performance Semantic Web Systems (SSWS+HPCSW 2012),
in conjunction with the International Semantic Web Conference (ISWC 2012). Boston (USA).
Martin Przyjaciel-Zablocki, Alexander Schätzle, Thomas Hornung, Christopher Dorner, Georg Lausen:
Cascading Map-Side Joins over HBase for Scalable Join Processing [ Tech. Report ]
Computing Research Repository (CoRR), June 2012.
Martin Przyjaciel-Zablocki, Alexander Schätzle, Thomas Hornung, Georg Lausen:
RDFPath: Path Query Processing on Large RDF Graphs with MapReduce (extended revised version) [ .pdf ]
The Semantic Web: ESWC 2011 Workshops, Revised Selected Papers, LNCS 7117, pp. 50–64, Springer, 2012.
Alexander Schätzle, Martin Przyjaciel-Zablocki, Georg Lausen:
PigSPARQL: Mapping SPARQL to Pig Latin [ .pdf ]
3rd International Workshop on Semantic Web Information Management (SWIM 2011),
in conjunction with the 2011 ACM International Conference on Management of Data (SIGMOD 2011). Athens (Greece).
Martin Przyjaciel-Zablocki, Alexander Schätzle, Thomas Hornung, Georg Lausen:
RDFPath: Path Query Processing on Large RDF Graphs with MapReduce [ .pdf ]
1st Workshop on High-Performance Computing for the Semantic Web (HPCSW 2011),
collocated with 8th Extended Semantic Web Conference (ESWC 2011). Heraklion (Greece).
Alexander Schätzle, Martin Przyjaciel-Zablocki, Thomas Hornung, Georg Lausen:
PigSPARQL: Übersetzung von SPARQL nach Pig Latin [ .pdf ]
In Proc. 14th conference on Database Systems for Business, Technology and Web (BTW 2011).
Kaiserslautern (Germany).
Alexander Schätzle:
PigSPARQL: Eine Übersetzung von SPARQL nach PigLatin [ .pdf ]
Master Thesis, September 2010. University of Freiburg (Germany)

Talks

S2RDF: RDF Querying with SPARQL on Spark [ .pdf ]
VLDB 2016, September 2016. New Delhi (India).
S2X: Graph-Parallel Querying of RDF with GraphX [ .pdf ]
Big-O(Q) @ VLDB 2015, August 2015. Hawai'i (USA).
RDF Constraint Checking [ .pdf ]
LWDM @ EDBT/ICDT 2015, March 2015. Brussels (Belgium).
Sempala: Interactive SPARQL Query Processing on Hadoop [ .pdf ] [ video ]
ISWC 2014, October 2014. Riva del Garda (Italy).
Map-Side Merge Joins for Scalable SPARQL BGP Processing [ .pdf ]
CLOUD 2013, December 2013. Bristol (UK).
Large-Scale Bisimulation of RDF Graphs [ .pdf ]
SWIM @ SIGMOD 2013, June 2013. New York (USA).
Cascading Map-Side Joins over HBase for Scalable Join Processing [ .pdf ] [ video ]
SSWS+HPCSW @ ISWC 2012, November 2012. Boston (USA).
PigSPARQL: Mapping SPARQL to Pig Latin [ .pdf ]
SWIM @ SIGMOD 2011, June 2011. Athens (Greece).
PigSPARQL: A Translation from SPARQL to Pig Latin [ .pdf ]
BTW 2011, March 2011. Kaiserslautern (Germany).
Handling Large RDF Graphs with MapReduce [ .pdf ]
Semantic Rhine, October 2010. University of Freiburg (Germany).

Teaching

Lecturer, Databases and Information Systems, University of Freiburg, WS16/17
Lecturer, Lab Course on Querying Big Data, University of Freiburg, SS16
Supervisor, Seminar on Game Theory and Electronic Markets, University of Freiburg, SS16
Lecturer, Data Analysis and Querying on Hadoop Masterproject, University of Freiburg, WS15/16
Supervisor, Databases and Information Systems, University of Freiburg, WS15/16
Lecturer, Lab Course on Querying Big Data, University of Freiburg, SS15
Supervisor, Databases and Information Systems, University of Freiburg, WS14/15
Lecturer, Massive Graph Processing on Hadoop Masterproject, University of Freiburg, WS14/15
Supervisor, Seminar on Linked Data, University of Freiburg, WS14/15
Lecturer, Lab Course on Querying Big Data, University of Freiburg, SS14
Supervisor, Databases and Information Systems, University of Freiburg, WS13/14
Lecturer, Cloud Computing Teamproject, University of Freiburg, WS13/14
Supervisor, Seminar on Big Data Analytics - Foundations and Applications, University of Freiburg, WS13/14
Supervisor, Data Models and Query Languages, University of Freiburg, SS13
Lecturer, Lab Course on Databases and Cloud Computing, University of Freiburg, SS13
Lecturer, Foundations of Database Systems, Center for Key Qualifications, University of Freiburg, WS12/13
Lecturer, Cloud Computing Teamproject, University of Freiburg, WS12/13
Lecturer, Lab Course on Databases and Cloud Computing, University of Freiburg, SS12
Lecturer, Cloud Computing Teamproject, University of Freiburg, WS11/12
Supervisor, Distributed Databases Seminar, University of Freiburg, WS11/12
Supervisor, Advanced Information Systems, University of Freiburg, SS11
Lecturer, Lab Course on Databases and Cloud Computing, University of Freiburg, SS11
Lecturer, Cloud Computing Project, University Freiburg, WS10/11
TA, Introduction to Computer Science, University of Freiburg, SS10
TA, Algorithms Theory, University of Freiburg, WS09/10
TA, Introduction to Computer Science, University of Freiburg, SS09
TA, Algorithms Theory, University of Freiburg, WS08/09
TA, Introduction to Computer Science, University of Freiburg, SS08
TA, Informatics II - Algorithms and Datastructures, University of Freiburg, SS08
TA, Algorithms Theory, University of Freiburg, WS07/08
TA, Introduction to Computer Science, University of Freiburg, SS07
TA, Informatics I, University of Freiburg, WS06/07
TA, Practical Course on Mobile Hardware, University of Freiburg, SS06