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Relay discovery and selection for large-scale P2P streaming.

Chengwei Zhang1, Angela Yunxian Wang2, Xiaojun Hei1

  • 1School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, Hubei, China.

Plos One
|April 15, 2017
PubMed
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Selecting optimal relays in large peer-to-peer networks is challenging. This study proposes a two-phase approach using indirect measurements for initial candidate discovery and direct probing for accurate relay selection, improving performance in P2P streaming networks.

Area of Science:

  • Computer Science
  • Networking
  • Distributed Systems

Background:

  • Application relays are crucial for P2P network services, with performance heavily dependent on relay location.
  • Discovering and selecting optimal relays in large, dynamic P2P streaming networks presents significant communication and computation challenges.

Purpose of the Study:

  • To address the challenges of location-aware relay discovery and selection in large-scale P2P streaming networks.
  • To evaluate the accuracy of indirect network location measurements and their impact on relay selection.
  • To propose an efficient and accurate two-phase approach for relay discovery and selection.

Main Methods:

  • Analyzed the accuracy of indirect network location measurements (e.g., ICS) and direct probing.
  • Investigated error amplification in the "best-out-of-K" selection method.

Related Experiment Videos

  • Developed and evaluated a two-phase relay selection strategy using Distributed Hash Tables (DHTs).

    • Main Results:

    • Purely indirect measurements provide coarse location estimations and lead to suboptimal relay selection.
    • The "best-out-of-K" method exhibits significant error amplification with RTT data.
    • The proposed two-phase approach efficiently discovers high-quality relay candidates using indirect measurements and refines selection with direct probing via DHTs.

    Conclusions:

    • Indirect measurements alone are insufficient for accurate P2P relay selection.
    • A two-phase approach combining indirect measurements for candidate narrowing and direct probing for final selection is effective.
    • DHT-based implementation offers efficient relay discovery and selection in large-scale P2P networks, handling peer churn effectively.