1. Working Group on Applications H. Li J.O. Pereira R. Baldoni E. Riviere

2. Gossip Based Applications Good Adaptation Robustness Self-organization Large scale Unknown Environment …………….. Bad Efficiency Determinism Lack of precise and comparable specifications ……………..

3. Physical Gossip Instantiation: Aggregation level and communication layer Application Layer LS Semantic Gossip Instantiation: Aggregation level and communication layer LS Semantic setting Physical Setting network Global properties (e.g. connectivity, peersampling) Semantic properties (e.g. clustering through common interests, semantic peersampling etc)

4. Position Many systems employing gossiping use an ad-hoc design. This limits the number of applications that could exploit the benefits of gossiping. We avocate the need for a design framework at the conceptual level based on generic building blocks.

5. The design framework is basically split into two main layers: the semantic one and the physical one. –The goal of the physical layer is to provide at the upper layer an abstraction including services for disseminating information and peer sampling. Each node include a local state which is used to guarantee global connectivity as well as previous services. TCP/IP networks Overlay management protocol Peer-sampling Dissemination

6. The goal of the semantic layer is to build the logical network compliant to the application needs. In this sense it provides an abstraction to applications including services for: group composition, logical failure detection, group dissemination, semantic peer-sampling Aggregation Eventual consistency Example: group composition based on –Properties of the local state (Monica Bellucci’s fans club) –Properties of a subset of local states (geographycal proximity) –Global property (k groups of some size h) Properties instrumented by Applications (integrated approach)

7. Applications TCP/IP networks Overlay management protocol Peer-samplingDissemination Physical layer Local State gossiping based logic for semantic overlay Group Composition Logical failure detection Semantic Local State Semantic Layer Semantic peer-sampling Dissemination File sharing Sensors networks File system synch System Management Streaming Virus Containment Games Pub/sub