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Documents authored by Sadoghi, Mohammad

Document
Complete Volume
DOI: 10.4230/OASIcs.FAB.2021
OASIcs, Volume 92, FAB 2021, Complete Volume

Authors: Vincent Gramoli and Mohammad Sadoghi

Published in: OASIcs, Volume 92, 4th International Symposium on Foundations and Applications of Blockchain 2021 (FAB 2021)

Abstract
OASIcs, Volume 92, FAB 2021, Complete Volume
Cite as

4th International Symposium on Foundations and Applications of Blockchain 2021 (FAB 2021). Open Access Series in Informatics (OASIcs), Volume 92, pp. 1-96, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@Proceedings{gramoli_et_al:OASIcs.FAB.2021,
  title =	{{OASIcs, Volume 92, FAB 2021, Complete Volume}},
  booktitle =	{4th International Symposium on Foundations and Applications of Blockchain 2021 (FAB 2021)},
  pages =	{1--96},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-95977-196-2},
  ISSN =	{2190-6807},
  year =	{2021},
  volume =	{92},
  editor =	{Gramoli, Vincent and Sadoghi, Mohammad},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.FAB.2021},
  URN =		{urn:nbn:de:0030-drops-139857},
  doi =		{10.4230/OASIcs.FAB.2021},
  annote =	{Keywords: OASIcs, Volume 92, FAB 2021, Complete Volume}
}
Document
Front Matter
DOI: 10.4230/OASIcs.FAB.2021.0
Front Matter, Table of Contents, Preface, Conference Organization

Authors: Vincent Gramoli and Mohammad Sadoghi

Published in: OASIcs, Volume 92, 4th International Symposium on Foundations and Applications of Blockchain 2021 (FAB 2021)

Abstract
Front Matter, Table of Contents, Preface, Conference Organization
Cite as

4th International Symposium on Foundations and Applications of Blockchain 2021 (FAB 2021). Open Access Series in Informatics (OASIcs), Volume 92, pp. 0:i-0:viii, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@InProceedings{gramoli_et_al:OASIcs.FAB.2021.0,
  author =	{Gramoli, Vincent and Sadoghi, Mohammad},
  title =	{{Front Matter, Table of Contents, Preface, Conference Organization}},
  booktitle =	{4th International Symposium on Foundations and Applications of Blockchain 2021 (FAB 2021)},
  pages =	{0:i--0:viii},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-95977-196-2},
  ISSN =	{2190-6807},
  year =	{2021},
  volume =	{92},
  editor =	{Gramoli, Vincent and Sadoghi, Mohammad},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.FAB.2021.0},
  URN =		{urn:nbn:de:0030-drops-139865},
  doi =		{10.4230/OASIcs.FAB.2021.0},
  annote =	{Keywords: Front Matter, Table of Contents, Preface, Conference Organization}
}
Document
DOI: 10.4230/LIPIcs.ICDT.2020.17
Coordination-Free Byzantine Replication with Minimal Communication Costs

Authors: Jelle Hellings and Mohammad Sadoghi

Published in: LIPIcs, Volume 155, 23rd International Conference on Database Theory (ICDT 2020)

Abstract
State-of-the-art fault-tolerant and federated data management systems rely on fully-replicated designs in which all participants have equivalent roles. Consequently, these systems have only limited scalability and are ill-suited for high-performance data management. As an alternative, we propose a hierarchical design in which a Byzantine cluster manages data, while an arbitrary number of learners can reliable learn these updates and use the corresponding data. To realize our design, we propose the delayed-replication algorithm, an efficient solution to the Byzantine learner problem that is central to our design. The delayed-replication algorithm is coordination-free, scalable, and has minimal communication cost for all participants involved. In doing so, the delayed-broadcast algorithm opens the door to new high-performance fault-tolerant and federated data management systems. To illustrate this, we show that the delayed-replication algorithm is not only useful to support specialized learners, but can also be used to reduce the overall communication cost of permissioned blockchains and to improve their storage scalability.
Cite as

Jelle Hellings and Mohammad Sadoghi. Coordination-Free Byzantine Replication with Minimal Communication Costs. In 23rd International Conference on Database Theory (ICDT 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 155, pp. 17:1-17:20, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)

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@InProceedings{hellings_et_al:LIPIcs.ICDT.2020.17,
  author =	{Hellings, Jelle and Sadoghi, Mohammad},
  title =	{{Coordination-Free Byzantine Replication with Minimal Communication Costs}},
  booktitle =	{23rd International Conference on Database Theory (ICDT 2020)},
  pages =	{17:1--17:20},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-139-9},
  ISSN =	{1868-8969},
  year =	{2020},
  volume =	{155},
  editor =	{Lutz, Carsten and Jung, Jean Christoph},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICDT.2020.17},
  URN =		{urn:nbn:de:0030-drops-119418},
  doi =		{10.4230/LIPIcs.ICDT.2020.17},
  annote =	{Keywords: Byzantine learner, coordination-free checkpoint protocol, delayed-replication, information dispersal, consensus}
}
Document
Brief Announcement
DOI: 10.4230/LIPIcs.DISC.2019.44
Brief Announcement: Revisiting Consensus Protocols through Wait-Free Parallelization

Authors: Suyash Gupta, Jelle Hellings, and Mohammad Sadoghi

Published in: LIPIcs, Volume 146, 33rd International Symposium on Distributed Computing (DISC 2019)

Abstract
In this brief announcement, we propose a protocol-agnostic approach to improve the design of primary-backup consensus protocols. At the core of our approach is a novel wait-free design of running several instances of the underlying consensus protocol in parallel. To yield a high-performance parallelized design, we present coordination-free techniques to order operations across parallel instances, deal with instance failures, and assign clients to specific instances. Consequently, the design we present is able to reduce the load on individual instances and primaries, while also reducing the adverse effects of any malicious replicas. Our design is fine-tuned such that the instances coordinated by non-faulty replicas are wait-free: they can continuously make consensus decisions, independent of the behavior of any other instances.
Cite as

Suyash Gupta, Jelle Hellings, and Mohammad Sadoghi. Brief Announcement: Revisiting Consensus Protocols through Wait-Free Parallelization. In 33rd International Symposium on Distributed Computing (DISC 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 146, pp. 44:1-44:3, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{gupta_et_al:LIPIcs.DISC.2019.44,
  author =	{Gupta, Suyash and Hellings, Jelle and Sadoghi, Mohammad},
  title =	{{Brief Announcement: Revisiting Consensus Protocols through Wait-Free Parallelization}},
  booktitle =	{33rd International Symposium on Distributed Computing (DISC 2019)},
  pages =	{44:1--44:3},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-126-9},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{146},
  editor =	{Suomela, Jukka},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.DISC.2019.44},
  URN =		{urn:nbn:de:0030-drops-113514},
  doi =		{10.4230/LIPIcs.DISC.2019.44},
  annote =	{Keywords: Consensus, primary-backup, high-performance, wait-free parallelization}
}
Document
Brief Announcement
DOI: 10.4230/LIPIcs.DISC.2019.45
Brief Announcement: The Fault-Tolerant Cluster-Sending Problem

Authors: Jelle Hellings and Mohammad Sadoghi

Published in: LIPIcs, Volume 146, 33rd International Symposium on Distributed Computing (DISC 2019)

Abstract
The development of fault-tolerant distributed systems that can tolerate Byzantine behavior has traditionally been focused on consensus protocols, which support fully-replicated designs. For the development of more sophisticated high-performance Byzantine distributed systems, more specialized fault-tolerant communication primitives are necessary, however. In this brief announcement, we identify the cluster-sending problem - the problem of sending a message from one Byzantine cluster to another Byzantine cluster in a reliable manner - as such an essential communication primitive. We not only formalize this fundamental problem, but also establish lower bounds on the complexity of this problem under crash failures and Byzantine failures. Furthermore, we develop practical cluster-sending protocols that meet these lower bounds and, hence, have optimal complexity. As such, our work provides a strong foundation for the further exploration of novel designs that address challenges encountered in fault-tolerant distributed systems.
Cite as

Jelle Hellings and Mohammad Sadoghi. Brief Announcement: The Fault-Tolerant Cluster-Sending Problem. In 33rd International Symposium on Distributed Computing (DISC 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 146, pp. 45:1-45:3, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{hellings_et_al:LIPIcs.DISC.2019.45,
  author =	{Hellings, Jelle and Sadoghi, Mohammad},
  title =	{{Brief Announcement: The Fault-Tolerant Cluster-Sending Problem}},
  booktitle =	{33rd International Symposium on Distributed Computing (DISC 2019)},
  pages =	{45:1--45:3},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-126-9},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{146},
  editor =	{Suomela, Jukka},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.DISC.2019.45},
  URN =		{urn:nbn:de:0030-drops-113528},
  doi =		{10.4230/LIPIcs.DISC.2019.45},
  annote =	{Keywords: Byzantine clusters, message sending, lower bound, optimal protocol}
}
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