caa a22 4500 445355077 CHVBK 20180317142857.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s00446-011-0144-6 doi (NATIONALLICENCE)springer-10.1007/s00446-011-0144-6 Meeting the deadline: on the complexity of fault-tolerant continuous gossip [Elektronische Daten] [Chryssis Georgiou, Seth Gilbert, Dariusz Kowalski] In this paper we introduce the problem of Continuous Gossip in which rumors are continually and dynamically injected throughout the network. Each rumor has a deadline, and the goal of a continuous gossip protocol is to ensure good "Quality of Delivery,” i.e., to deliver every rumor to every process before the deadline expires. Thus, a trivial solution to the problem of Continuous Gossip is simply for every process to broadcast every rumor as soon as it is injected. Unfortunately, this solution has high per-round message complexity. Complicating matters, we focus our attention on a highly dynamic network in which processes may continually crash and recover. In order to achieve good per-round message complexity in a dynamic network, processes need to continually form and re-form coalitions that cooperate to spread their rumors throughout the network. The key challenge for a Continuous Gossip protocol is the ongoing adaptation to the ever-changing set of active rumors and non-crashed process. In this work we show how to address this challenge; we develop randomized and deterministic protocols for Continuous Gossip and prove lower bounds on the per-round message-complexity, indicating that our protocols are close to optimal. Springer-Verlag, 2011 Gossip nationallicence Crashes and restarts nationallicence Dynamic rumor injection nationallicence Random and expander graphs nationallicence Georgiou Chryssis Department of Computer Science, University of Cyprus, 1048, Nicosia, Cyprus aut Gilbert Seth Department of Computer Science, National University of Singapore, 119077, Singapore, Singapore aut Kowalski Dariusz Department of Computer Science, University of Liverpool, L69 3BX, Liverpool, UK aut Distributed Computing Springer-Verlag 24/5(2011-12-01), 223-244 0178-2770 24:5<223 2011 24 446 https://doi.org/10.1007/s00446-011-0144-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00446-011-0144-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Georgiou Chryssis Department of Computer Science, University of Cyprus, 1048, Nicosia, Cyprus aut NATIONALLICENCE 700 1- Gilbert Seth Department of Computer Science, National University of Singapore, 119077, Singapore, Singapore aut NATIONALLICENCE 700 1- Kowalski Dariusz Department of Computer Science, University of Liverpool, L69 3BX, Liverpool, UK aut NATIONALLICENCE 773 0- Distributed Computing Springer-Verlag 24/5(2011-12-01), 223-244 0178-2770 24:5<223 2011 24 446 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer