Gestion de groupe partitionnable dans les réseaux mobiles spontanés

Dans les réseaux mobiles spontanés (en anglais, Mobile Ad hoc NETworks ou MANETs), la gestion de groupe partitionnable est un service de base permettant la construction d'applications réparties tolérantes au partitionnement. Aucune des spécifications existantes ne satisfait les deux exigences antagonistes suivantes : 1) elle doit être assez forte pour fournir des garanties utiles aux applications réparties dans les systèmes partitionnables ; 2) elle doit être assez faible pour être résoluble. Dans cette thèse, nous proposons une solution à la gestion de groupe partitionnable en environnements réseaux très dynamiques tels que les MANETs. Pour mettre en œuvre notre solution, nous procédons en trois étapes. Tout d'abord, nous proposons un modèle de système réparti dynamique qui caractérise la stabilité dans les MANETs. Ensuite, nous adaptons pour les systèmes partitionnables l'approche Paxos à base de consensus Synod. Cette adaptation résulte en la spécification d'un consensus abandonnable AC construit au-dessus d'un détecteur ultime des a participants d'une partition PPD et d'un registre ultime par partition RPP. PPD garantit la vivacité dans une partition même si la partition n'est pas complètement stable tandis que RPP préserve la sûreté dans la même partition. Enfin, la gestion de groupe partitionnable est résolue en la transformant en une séquence d'instances de AC. Chacun des modules PPD, RPP, AC et gestion de groupe partitionnable est implanté et prouvé. Par ailleurs, nous analysons les performances de PPD par simulationIn Mobile Ad hoc NETworks or MANETs, partitionable group membership is a basic service for building partition-tolerant applications. None of the existing specifications satisfy the two following antagonistic requirements: 1) it must be strong enough to simplify the design of partition-tolerant distributed applications in partitionable systems; 2) it must be weak enough to be implantable. In this thesis, we propose a solution to partitionable group membership in very dynamic network environment such as MANETs. To this means, we proceed in three steps. First, we develop a dynamic distributed system model that characterises stability in MANETs. Then, we propose a solution to the problem of partitionable group membership by adapting Paxos for such systems. This adatation results in a specification of abortable consensus AC which is composed of an eventual a partition-participants detector PPD and an eventual register per partition RPP. PPD guarantees liveness in a partition even if the partition is not completely stable whereas RPP ensures safety in the same partition. Finally, partitionable group membership is solved by transforming it into a sequence of abortable consensus instances AC. Each of the modules PPD, RPP, AC, and partitionable group membership is implanted and proved. Next, we analyse the performances of PPD by simulationEVRY-INT (912282302) / SudocSudocFranceF

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