TY - GEN A1 - Hupfeld, Felix T1 - Hierarchical Structures in Attribute-based Namespaces and their Application to Browsing N2 - While attribute-value pairs are a popular method to name objects, information retrieval from those attribute-based namespaces is not an easy task. The user has to recall correct attribute names and values and master the syntax and semantics of query formulation. This paper describes hierarchical structures in attribute-based namespaces, shows how to extract them efficiently and evaluates the quality of these structures in an user experiment. It proposes an user interface for browsing attribute-named object sets which makes this task resemble todays file-system browsers and compares the usability of this interface to normal form-based methods in an user study. T3 - ZIB-Report - 03-06 Y1 - 2002 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-7280 ER - TY - GEN A1 - Kolbeck, Björn A1 - Högqvist, Mikael A1 - Stender, Jan A1 - Hupfeld, Felix T1 - Fault-Tolerant and Decentralized Lease Coordination in Distributed Systems N2 - Applications which need exclusive access to a shared resource in distributed systems require a fault-tolerant and scalable mechanism to coordinate this exclusive access. Examples of such applications include distributed file systems and master/slave data replication. We present Flease, an algorithm for decentralized and fault-tolerant lease coordination in distributed systems. Our algorithm allows the processes competing for a resource to coordinate exclusive access through leases among themselves without a central component. The resulting system easily scales with an increasing number of nodes and resources. We prove that Flease ensures exclusive access, i.e. guarantees that there is at most one valid lease at any time. T3 - ZIB-Report - 10-02 Y1 - 2010 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-11658 SN - 1438-0064 ER - TY - JOUR A1 - Kolbeck, Björn A1 - Högqvist, Mikael A1 - Stender, Jan A1 - Hupfeld, Felix T1 - Flease - Lease Coordination Without a Lock Server JF - Parallel and Distributed Processing Symposium, International Y1 - 2011 U6 - https://doi.org/10.1109/IPDPS.2011.94 VL - 0 SP - 978 EP - 988 PB - IEEE Computer Society CY - Los Alamitos, CA, USA ER - TY - CHAP A1 - Stender, Jan A1 - Kolbeck, Björn A1 - Högqvist, Mikael A1 - Hupfeld, Felix T1 - BabuDB: Fast and Efficient File System Metadata Storage T2 - Storage Network Architecture and Parallel I/Os, IEEE International Workshop on Y1 - 2010 U6 - https://doi.org/10.1109/SNAPI.2010.14 SP - 51 EP - 58 PB - IEEE Computer Society CY - Los Alamitos, CA, USA ER - TY - JOUR A1 - Hupfeld, Felix A1 - Kolbeck, Björn A1 - Stender, Jan A1 - Högqvist, Mikael A1 - Cortes, Toni A1 - Martí, Jonathan A1 - Malo, Jesus T1 - FaTLease: scalable fault-tolerant lease negotiation with Paxos JF - Cluster Computing Y1 - 2009 U6 - https://doi.org/10.1007/s10586-009-0074-2 VL - 12 IS - 2 SP - 175 EP - 188 ER - TY - CHAP A1 - Stender, Jan A1 - Kolbeck, Björn A1 - Hupfeld, Felix A1 - Cesario, Eugenio A1 - Focht, Erich A1 - Hess, Matthias A1 - Malo, Jesus A1 - Martí, Jonathan T1 - Striping without Sacrifices: Maintaining POSIX Semantics in a Parallel File System T2 - Proceedings of the 1st USENIX Workshop on Large-Scale Computing (LASCO’08) Y1 - 2008 CY - Boston, MA, USA ER - TY - JOUR A1 - Hupfeld, Felix A1 - Cortes, Toni A1 - Kolbeck, Björn A1 - Focht, Erich A1 - Hess, Matthias A1 - Malo, Jesus A1 - Marti, Jonathan A1 - Stender, Jan A1 - Cesario, Eugenio T1 - The XtreemFS architecture - A case for object-based file systems in Grids JF - Concurrency and Computation: Practice and Experience Y1 - 2008 VL - 20 IS - 8 ER - TY - CHAP A1 - Hupfeld, Felix A1 - Kolbeck, Björn A1 - Stender, Jan A1 - Högqvist, Mikael A1 - Cortes, Toni A1 - Martí, Jonathan A1 - Malo, Jesus T1 - FaTLease: Scalable Fault-Tolerant Lease Negotiation with Paxos T2 - ACM/IEEE International Symposium on High Performance Distributed Computing (HPDC) Y1 - 2008 CY - Boston, MA, USA ER - TY - THES A1 - Hupfeld, Felix T1 - Causal weak-consistency replication – a systems approach Y1 - 2009 U6 - http://nbn-resolving.de/urn/resolver.pl?nbn:de:kobv:11-100100235 UR - http://edoc.hu-berlin.de/docviews/abstract.php?id=29970 ER - TY - CHAP A1 - Hupfeld, Felix T1 - Log-Structured Storage for Efficient Weakly-Connected Replication T2 - 24th International Conference on Distributed Computing Systems Workshops (ICDCS 2004 Workshops), 23-24 March 2004, Hachioji, Tokyo, Japan Y1 - 2004 U6 - https://doi.org/10.1109/ICDCSW.2004.1284072 SP - 458 EP - 463 PB - IEEE Computer Society ER - TY - JOUR A1 - Hupfeld, Felix A1 - Gordon, M. T1 - Using distributed consistent branching for efficient reconciliation of mobile workspaces JF - International Conference on Collaborative Computing Y1 - 2006 U6 - https://doi.org/10.1109/COLCOM.2006.361837 VL - 0 SP - 8 PB - IEEE Computer Society CY - Los Alamitos, CA, USA ER - TY - CHAP A1 - Hupfeld, Felix A1 - Cortes, Toni A1 - Kolbeck, Björn A1 - Stender, Jan A1 - Focht, Erich A1 - Hess, Matthias A1 - Malo, Jesus A1 - Marti, Jonathan A1 - Cesario, Eugenio T1 - XtreemFS: a case for object-based storage in Grid data management T2 - 3rd VLDB Workshop on Data Management in Grids, co-located with VLDB 2007 Y1 - 2007 ER -