Title

Analysis of Link Lifetimes and Neighbor Selection in Switching DHTs

Document Type

Article

Publication Date

11-2011

Publication Source

IEEE Transactions on Parallel and Distributed Systems

Abstract

Several models of user churn, resilience, and link lifetime have recently appeared in the literature; however, these results do not directly apply to classical Distributed Hash Tables (DHTs) in which neighbor replacement occurs not only when current users die, but also when new users arrive into the system, and where replacement choices are often restricted to the successor of the failed zone in the DHT space. To understand neighbor churn in such networks, which we call switching DHTs, this paper proposes a simple, yet accurate, model for capturing link dynamics in structured P2P systems and obtains the distribution of link lifetimes for fairly generic DHTs. Similar to, our results show that deterministic networks (e.g., Chord, CAN) unfortunately do not extract much benefit from heavy-tailed user lifetimes since link durations are dominated by small remaining lifetimes of newly arriving users that replace the more reliable existing neighbors. We also examine link lifetimes in randomized DHTs equipped with multiple choices for each link and show that selecting the best neighbor in these scenarios is rather complicated as it depends on the desired load balancing, link resilience, and overhead. We offer insight into the various selection algorithms, their performance, and possibilities for improvement.

Inclusive pages

1834 - 1841

ISBN/ISSN

1045-9219

Comments

Permission documentation on file.

Publisher

Institute of Electrical and Electronics Engineers

Volume

22

Issue

11

Peer Reviewed

yes


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