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Documents authored by Hu, Xing

Document
DOI: 10.4230/LIPIcs.DISC.2022.36
On Implementing SWMR Registers from SWSR Registers in Systems with Byzantine Failures

Authors: Xing Hu and Sam Toueg

Published in: LIPIcs, Volume 246, 36th International Symposium on Distributed Computing (DISC 2022)

Abstract
The implementation of registers from (potentially) weaker registers is a classical problem in the theory of distributed computing. Since Lamport’s pioneering work [Leslie Lamport, 1986], this problem has been extensively studied in the context of asynchronous processes with crash failures. In this paper, we investigate this problem in the context of Byzantine process failures, with and without process signatures. In particular, we first show a strong impossibility result, namely, that there is no wait-free linearizable implementation of a 1-writer n-reader register from atomic 1-writer (n-1)-reader registers. In fact, this impossibility result holds even if all the processes except the writer are given atomic 1-writer n-reader registers, and even if we assume that the writer can only crash and at most one reader is subject to Byzantine failures. In light of this impossibility result, we give two register implementations. The first one implements a 1-writer n-reader register from atomic 1-writer 1-reader registers. This implementation is linearizable (under any combination of Byzantine process failures), but it is wait-free only under the assumption that the writer is correct or no reader is Byzantine - thus matching the impossibility result. The second implementation assumes process signatures; it is wait-free and linearizable under any number and combination of Byzantine process failures.
Cite as

Xing Hu and Sam Toueg. On Implementing SWMR Registers from SWSR Registers in Systems with Byzantine Failures. In 36th International Symposium on Distributed Computing (DISC 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 246, pp. 36:1-36:19, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)

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@InProceedings{hu_et_al:LIPIcs.DISC.2022.36,
  author =	{Hu, Xing and Toueg, Sam},
  title =	{{On Implementing SWMR Registers from SWSR Registers in Systems with Byzantine Failures}},
  booktitle =	{36th International Symposium on Distributed Computing (DISC 2022)},
  pages =	{36:1--36:19},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-255-6},
  ISSN =	{1868-8969},
  year =	{2022},
  volume =	{246},
  editor =	{Scheideler, Christian},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.DISC.2022.36},
  URN =		{urn:nbn:de:0030-drops-172272},
  doi =		{10.4230/LIPIcs.DISC.2022.36},
  annote =	{Keywords: distributed computing, concurrency, linearizability, shared registers}
}
Document
DOI: 10.4230/LIPIcs.OPODIS.2019.28
Optimal Register Construction in M&M Systems

Authors: Vassos Hadzilacos, Xing Hu, and Sam Toueg

Published in: LIPIcs, Volume 153, 23rd International Conference on Principles of Distributed Systems (OPODIS 2019)

Abstract
Motivated by recent distributed systems technology, Aguilera et al. introduced a hybrid model of distributed computing, called message-and-memory model or m&m model for short [Marcos K. Aguilera et al., 2018]. In this model, processes can communicate by message passing and also by accessing some shared memory. We consider the basic problem of implementing an atomic single-writer multi-reader (SWMR) register shared by all the processes in m&m systems. Specifically, we give an algorithm that implements such a register in m&m systems and show that it is optimal in the number of process crashes that it can tolerate. This generalizes the well-known implementation of an atomic SWMR register in a pure message-passing system [Attiya et al., 1995].
Cite as

Vassos Hadzilacos, Xing Hu, and Sam Toueg. Optimal Register Construction in M&M Systems. In 23rd International Conference on Principles of Distributed Systems (OPODIS 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 153, pp. 28:1-28:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)

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@InProceedings{hadzilacos_et_al:LIPIcs.OPODIS.2019.28,
  author =	{Hadzilacos, Vassos and Hu, Xing and Toueg, Sam},
  title =	{{Optimal Register Construction in M\&M Systems}},
  booktitle =	{23rd International Conference on Principles of Distributed Systems (OPODIS 2019)},
  pages =	{28:1--28:16},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-133-7},
  ISSN =	{1868-8969},
  year =	{2020},
  volume =	{153},
  editor =	{Felber, Pascal and Friedman, Roy and Gilbert, Seth and Miller, Avery},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.OPODIS.2019.28},
  URN =		{urn:nbn:de:0030-drops-118148},
  doi =		{10.4230/LIPIcs.OPODIS.2019.28},
  annote =	{Keywords: asynchronous distributed system, shared memory, message passing}
}
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