Toward a Quality-of-Service Framework for Peer-to-Peer Applications

Toward a Quality-of-Service Framework for Peer-to-Peer Applications

Ankur Gupta, Lalit K. Awasthi
Copyright: © 2010 |Pages: 23
DOI: 10.4018/jdst.2010070101
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P2P networks have caught the imagination of the research community and application developers with their sheer scalability and fault-tolerance characteristics. However, only content-sharing applications based on the P2P concept have reached the desired level of maturity. The potential of the P2P concept for designing the next-generation of real-world distributed applications can be realized only if a comprehensive framework quantifying the performance related aspects of all classes of P2P applications is available. Researchers have proposed some QoS (Quality-of-Service) parameters for content-sharing P2P applications based on response time and delay, but these do not cover the gamut of application domains that the P2P concept is applicable to. Hence, this research paper proposes an early QoS framework covering various classes of P2P applications; content distribution, distributed computing and communication and collaboration. Early results from the prototype implementation of the Peer Enterprises framework (a cross-organizational P2P collaborative application) are used as a basis for formulation of the QoS parameters. The individual performance measures which comprise the QoS framework are also discussed in detail along with some thoughts on how these can be complied with. The proposed framework would hopefully lead to quantifiable Service-Level Agreements for a variety of peer-to-peer services and applications.
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P2P networks have traditionally been considered too transient in nature to perform useful computations for real-world applications, leave aside the formulation of a viable QoS framework. The only mature application that P2P networks successfully cater to, are those related to content sharing, where the sheer scale of P2P networks along with strategies for content-caching and replication enable content to be located and downloaded in a time-bound manner. Gummadi et al. (2003), made an early attempt at analyzing the P2P content sharing workloads, quantifying the impact of content locality on query performance and bandwidth savings. Since, then some QoS parameters for P2P applications have been proposed, but they have been limited to content-sharing applications. Specifically, QoS parameters have been proposed for:

  • 1.

    Guaranteed content location and retrieval (if it exists) – Query Success

  • 2.

    Time-bound content location and retrieval - Query Performance

  • 3.

    Correct content retrieval – Content Quality

  • 4.

    Video Streaming and Multicasting – Delay, Bandwidth and Jitter

However, the P2P concept has wide applicability in various application domains and the scale and fault-tolerant nature of P2P networks can be exploited to ensure that some useful work gets done even with the transience of participating peers. To quantify the extent of useful work performed and the expected performance a minimal and generic QoS framework needs to be established.

This research paper uses the preliminary experimental results from the implementation of the Peer Enterprises (PE) framework (a cross-organizational peer-to-peer framework encompassing content search, distributed computation, communication, remote storage and services deployment) and uses these experimental results to establish a minimal QoS framework for such P2P applications. Many of the proposed QoS parameters are applicable to P2P applications offering a subset of the features provided by the PE framework.



P2P applications can broadly be classified (Milojicic et al., 2002) into the following categories based on their functionality:

  • a.

    Content Distribution

  • b.

    Distributed Computation

  • c.

    Communication and Collaboration

Table 1 summarizes the application categories, application characteristics and examples of some well-known P2P applications.

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