NDLI: Re-Chord: a self-stabilizing chord overlay network

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Re-Chord: a self-stabilizing chord overlay network

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Re-Chord: a self-stabilizing chord overlay network

Content Provider	ACM Digital Library
Author	Koutsopoulos, Andreas Kniesburges, Sebastian Scheideler, Christian
Abstract	The Chord peer-to-peer system is considered, together with CAN, Tapestry and Pastry, as one of the pioneering works on peer-to-peer distributed hash tables (DHT) that inspired a large volume of papers and projects on DHTs as well as peer-to-peer systems in general. Chord, in particular, has been studied thoroughly, and many variants of Chord have been presented that optimize various criteria. Also, several implementations of Chord are available on various platforms. Though Chord is known to be very efficient and scalable and it can handle churn quite well, no protocol is known yet that guarantees that Chord is self-stabilizing, i.e., the Chord network can be recovered from any initial state in which the network is still weakly connected. This is not too surprising since it is known that in the Chord network it is not locally checkable whether its current topology matches the correct topology. We present a slight extension of the Chord network, called Re-Chord (reactive Chord), that turns out to be locally checkable, and we present a self-stabilizing distributed protocol for it that can recover the Re-Chord network from any initial state, in which the n peers are weakly connected, in O(n log n) communication rounds. We also show that our protocol allows a new peer to join or an old peer to leave an already stable Re-Chord network so that within O((log $n)^{2})$ communication rounds the Re-Chord network is stable again.
Starting Page	235
Ending Page	244
Page Count	10
File Format	PDF
ISBN	9781450307437
DOI	10.1145/1989493.1989527
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2011-06-04
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Self-stabilizing protocols Peer-to-peer networks Chord
Content Type	Text
Resource Type	Article

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