---+ P2P Networks Peer-to-peer networks are distributed systems, where all participating entities both provide and utilize services to/from each other. Our research in P2P covers both unstructured and structured architectures (Distributed Hash Tables - DHTs). ---++ XOROS Data redundancy in DHTs is commonly accomplished through automatic replication of values to a set of close participating nodes. Such copies, once written, should not be modified, as there is no inherent DHT function that can operate on a dynamic set of mutable replicas. To this end, we have designed and implemented XOROS - a system based on the Kademlia routing scheme, that addresses the problem by implementing a Byzantine-tolerant protocol for serializable data updates directly at the peer-to-peer level. Based upon related works that study distributed replica synchronization, mutual exclusion and communication in the presence of Byzantine behavior, we propose a unified DHT-based algorithm, that ties corresponding practices together in order to consistently propagate changes to all primary replicas of any key-value pair stored in the network. A multitude of applications may benefit from the resulting distributed read/write storage substrate as it retains all the advanced features of DHTs and is backwards compatible with existing put/get semantics. More info at: [[http://xoros.cslab.ece.ntua.gr][http://xoros.cslab.ece.ntua.gr]] ---++ Publications * A. Chazapis and N. Koziris, *"XOROS: A mutable Distributed Hash Table,"* in _Proceedings of the 5th International Workshop on Databases, Information Systems and Peer-to-Peer Computing (DBISP2P 2007)_, Vienna, Austria, September 2007 ![[[%ATTACHURL%/chazapis-dbisp2p2007.pdf][pdf]]] * A. Zissimos, K. Doka, A. Chazapis and N. Koziris, *"GridTorrent: Optimizing data transfers in the Grid with collaborative sharing,"* in _Proceedings of the 11th Panhellenic Conference on Informatics (PCI2007)_, Patras, Greece, May 2007 ![[[%ATTACHURL%/zissimos-pci2007.pdf][pdf]]] * A. Chazapis, A. Zissimos, N. Koziris and P. Tsanakas, *"Replica management services on the Grid: Evolving from a centralized design to a fully distributed, scalable and fault-tolerant peer-to-peer infrastructure,"* in _Grid Technologies: Emerging from Distributed Architectures to Virtual Organizations_, edited by M. P. Bekakos and G. A. Gravvanis, pp. 107-138, 2006, WIT Press, ISBN: 1-84564-055-1 ![[[http://www.witpress.com/acatalog/1845640551.html][link]]] * A. Chazapis, A. Zissimos and N. Koziris, *"A peer-to-peer replica management service for high-throughput Grids,"* in _Proceedings of the 2005 International Conference on Parallel Processing (ICPP05)_, Oslo, Norway, June 2005 ![[[%ATTACHURL%/chazapis-icpp05.pdf][pdf]]] * A. Chazapis and N. Koziris, *"Storing and locating mutable data in structured P2P overlay networks,"* in _Proceedings of the 10th Panhellenic Conference on Informatics (PCI2005)_, Volos, Greece, November 2005 ![[[%ATTACHURL%/chazapis-pci2005.pdf][pdf]]]
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