By Udo Bartlang

From time to time while the IT manager’s ally is platforms consolidation (which is a euphemism for centralisation), it might probably come slightly as a shock for you that this publication investigates decentralisation within the context of content material administration platforms. it will possibly look particularly visible that content material will and may be controlled by means of the celebration who creates and owns the content material, and for this reason may be held in a―somewhat―centralised and controlled place. in spite of the fact that, during the last few years, we've got been witnesses of a few very important tendencies and advancements which demand novel methods of wondering content material administration and perhaps even broader, approximately computers in most cases. First, ongoing enterprise globalization creates common distribution of knowledge at a corp- ate point, in addition to decentralization of keep an eye on over company assets and enterprise techniques. altering alliances with companions require ?exible architectures for content material administration that canadapttochangingconstellations, roles, andaccessrights. moment, theneedforoutsourcing and source e?ciency has caused thoughts of virtualization, lately culminating within the cloud computing buzzword. Virtualization of content material administration providers calls for - tremely scalable and ?exible underlying info and verbal exchange architectures. all these recommendations are theoretically and essentially most unlikely to enforce in response to c- tralised client-server architectures. 3rd, we're presently experiencing a dramatic shift within the roles of shoppers within the net. the days have long gone while caliber content material was once purely added through publishers and information enterprises. Wikis and different net 2. zero instruments empower shoppers to supply and submit their own content material.

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The chapter shows how P2P service groups may serve as a generic building block to construct content repository functions—applying replicated state machines. 5 are described. It contains results that have been published in [79, 99, 101, 148, 149]. In Chapter 7, the given architecture and methods to enable flexible content management in P2P systems are evaluated. The chapter contains results that have been published in [22, 80, 148, 149]. The thesis concludes in Chapter 8 with a summary of the research and an outlook on future work.

M¨ uller. DhtFlex: A Flexible Approach to Enable Efficient Atomic Data Management Tailored for Structured Peer–to–Peer Overlays. W. Chiu, and Manuela Popescu, editors, ICIW, volume 3, pages 377–384. IEEE Computer Society Press, June 2008. Proceedings of the Third International Conference on Internet and Web Applications and Services (ICIW 2008). • Udo Bartlang, Fabian St¨ aber, and J¨org P. M¨ uller. Introducing a JSR-170 StandardCompliant Peer–to–Peer Content Repository to Support Business Collaboration.

5 3 However, coordinator turnovers may be restricted as they may delay successful agreement. For instance, assuming a set of n replicas, each replica r is assigned a unique id idr between nil and n − 1. If a replica ρ wants to act as coordinator it selects the smallest sequence number s, which is larger than any sequence number it has received so far but corresponding to formula s mod n = idρ . 5 Again, a replica acknowledges such message only if it has not received a higher sequence number as a promise to subsequently dismiss messages from old (other) coordinators.

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