NDLI: The complexity of robust atomic storage

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The complexity of robust atomic storage

Content Provider	ACM Digital Library
Author	Guerraoui, Rachid Vukolić, Marko Suri, Neeraj Majuntke, Matthias Dobre, Dan
Abstract	We study the time-complexity of robust atomic read/write storage from fault-prone storage components in asynchronous message-passing systems. Robustness here means wait-free tolerating the largest possible number t of Byzantine storage component failures (optimal resilience) without relying on data authentication. We show that no single-writer multiple-reader (SWMR) robust atomic storage implementation exists if (a) read operations complete in less than four communication round-trips (rounds), and (b) the time complexity of write operations is constant. More precisely, we present two lower bounds. The first is a read lower bound stating that three rounds of communication are necessary to read from a SWMR robust atomic storage. The second is a write lower bound, showing that Ω(log(t)) write rounds are necessary to read in three rounds from such a storage. Applied to known results, our lower bounds close a fundamental gap: we show that time-optimal robust atomic storage can be obtained using well-known transformations from regular to atomic storage and existing time-optimal regular storage implementations.
Starting Page	59
Ending Page	68
Page Count	10
File Format	PDF
ISBN	9781450307192
DOI	10.1145/1993806.1993816
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2011-06-06
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Lower bounds
Content Type	Text
Resource Type	Article

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