NDLI: Failure Detectors in Homonymous Distributed Systems (with an Application to Consensus)

Content Provider	IEEE Xplore Digital Library
Author	Arevalo, S. Fernandez Anta, A. Imbs, D. Jimenez, E. Raynal, M.
Copyright Year	2012
Abstract	This paper is on homonymous distributed systems where processes are prone to crash failures and have no initial knowledge of the system membership (``homonymous'' means that several processes may have the same identifier). New classes of failure detectors suited to these systems are first defined. Among them, the classes $\HO$ and $\HS$ are introduced that are the homonymous counterparts of the classes $\Omega$ and $\Sigma$, respectively. (Recall that the pair $\langle \Omega, \Sigma\rangle$ defines the weakest failure detector to solve consensus.) Then, the paper shows how $\HO$ and $\HS$ can be implemented in homonymous systems without membership knowledge (under different synchrony requirements). Finally, two algorithms are presented that use these failure detectors to solve consensus in homonymous asynchronous systems where there is no initial knowledge of the membership. One algorithm solves consensus with $\langle \HO, \HS\rangle$, while the other uses only $\HO$, but needs a majority of correct processes. Observe that the systems with unique identifiers and anonymous systems are extreme cases of homonymous systems from which follows that all these results also apply to these systems. Interestingly, the new failure detector class $\HO$ can be implemented with partial synchrony, while the analogous class $\AO$ defined for anonymous systems can not be implemented (even in synchronous systems). Hence, the paper provides us with the first proof showing that consensus can be solved in anonymous systems with only partial synchrony (and a majority of correct processes).
Starting Page	275
Ending Page	284
File Size	425076
Page Count	10
File Format	PDF
ISBN	9781457702952
ISSN	10636927
DOI	10.1109/ICDCS.2012.13
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-06-18
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Detectors Computer crashes Safety Context Nominations and elections Distributed computing Face Process crash Agreement problem Asynchrony Consensus Distributed computability failure detector Homonymous system Message-passing
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications Hardware and Architecture Software

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