Selecting News and Elders in Unstructured Peer-to-Peer Network under Churn

The concept of Churn is the continuous process of node arrival and departure in distributed peer-to-peer network. There exists two eprotocol Selecting News and Eldersxtreme cases. The first one is that enormous nodes joining the system concurrently, which results in a flash crowd scenario for special nodes in the system. The other is that enormous nodes crashed or the connections between nodes are failed in a moment, which comes out a shrink search later. In this paper, we present a novel protocol Selecting News and Elders (SNE) with positive communication policy among peers and conservative neighbor maintenance scheme under churn, to keep desirable properties such as a low network diameter and clustering. The protocol is resilient against different churn and fit for P2P information dissemination and file sharing systems especially.