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Documents authored by Rodrigues, Luis

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Rodrigues, Luis

Document
Complete Volume
DOI: 10.4230/LIPIcs.OPODIS.2018
LIPIcs, Volume 125, OPODIS'18, Complete Volume

Authors: Jiannong Cao, Faith Ellen, Luis Rodrigues, and Bernardo Ferreira

Published in: LIPIcs, Volume 125, 22nd International Conference on Principles of Distributed Systems (OPODIS 2018)

Abstract
LIPIcs, Volume 125, OPODIS'18, Complete Volume
Cite as

22nd International Conference on Principles of Distributed Systems (OPODIS 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 125, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@Proceedings{cao_et_al:LIPIcs.OPODIS.2018,
  title =	{{LIPIcs, Volume 125, OPODIS'18, Complete Volume}},
  booktitle =	{22nd International Conference on Principles of Distributed Systems (OPODIS 2018)},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-098-9},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{125},
  editor =	{Cao, Jiannong and Ellen, Faith and Rodrigues, Luis and Ferreira, Bernardo},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.OPODIS.2018},
  URN =		{urn:nbn:de:0030-drops-101742},
  doi =		{10.4230/LIPIcs.OPODIS.2018},
  annote =	{Keywords: Computer systems organization, Dependable and fault-tolerant systems and networks, Computing methodologies, Distributed algorithms, Networks, Mobile networks, Wireless access networks, Ad hoc networks, Software and its engineering, Distributed systems organizing principles,}
}
Document
Front Matter
DOI: 10.4230/LIPIcs.OPODIS.2018.0
Front Matter, Table of Contents, Preface, Conference Organization

Authors: Jiannong Cao, Faith Ellen, Luis Rodrigues, and Bernardo Ferreira

Published in: LIPIcs, Volume 125, 22nd International Conference on Principles of Distributed Systems (OPODIS 2018)

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

22nd International Conference on Principles of Distributed Systems (OPODIS 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 125, pp. 0:i-0:xx, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{cao_et_al:LIPIcs.OPODIS.2018.0,
  author =	{Cao, Jiannong and Ellen, Faith and Rodrigues, Luis and Ferreira, Bernardo},
  title =	{{Front Matter, Table of Contents, Preface, Conference Organization}},
  booktitle =	{22nd International Conference on Principles of Distributed Systems (OPODIS 2018)},
  pages =	{0:i--0:xx},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-098-9},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{125},
  editor =	{Cao, Jiannong and Ellen, Faith and Rodrigues, Luis and Ferreira, Bernardo},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.OPODIS.2018.0},
  URN =		{urn:nbn:de:0030-drops-100607},
  doi =		{10.4230/LIPIcs.OPODIS.2018.0},
  annote =	{Keywords: Front Matter, Table of Contents, Preface, Conference Organization}
}
Document
DOI: 10.4230/LIPIcs.OPODIS.2017.1
Causality for the Masses: Offering Fresh Data, Low Latency, and High Throughput

Authors: Luís Rodrigues

Published in: LIPIcs, Volume 95, 21st International Conference on Principles of Distributed Systems (OPODIS 2017)

Abstract
The problem of ensuring consistency in applications that manage replicated data is one of the main challenges of distributed computing. Among the several invariants that may be enforced, ensuring that updates are applied and made visible respecting causality has emerged as a key ingredient among the many consistency criteria and client session guarantees that have been proposed and implemented in the last decade. Techniques to keep track of causal dependencies, and to subsequently ensure that messages are delivered in causal order, have been widely studied. It is today well known that, in order to accurately capture causality one may need to keep a large amounts of metadata, for instance, one vector clock for each data object. This metadata needs to be updated and piggybacked on update messages, such that updates that are received from remote datacenters can be applied locally without violating causality. This metadata can be compressed; ultimately, it is possible to preserve causal order using a single scalar as metadata, i.e., a Lamport’s clock. Unfortunately, when compressing metadada it may become impossible to distinguish if two events are concurrent or causally related. We denote such scenario a false dependency. False dependencies introduce unnecessary delays and impair the latency of update propagation. This problem is exacerbated when one wants to support partial replication. Therefore, when building a geo-replicated large-scale system one is faced with a dilemma: one can use techniques that maintain few metadata and that fail to capture causality accurately, or one can use techniques that require large metadata (to be kept and exchanged) but have precise information about which updates are concurrent. The former usually offer good throughput at the cost of latency, while the latter offer lower latencies sacrificing throughput. This talk reports on Saturn[1] and Eunomia[2], two complementary systems that break this tradeoff by providing simultaneously high-throughput and low latency, even in face of partial replication. The key ingredient to the success of our approach is to decouple the metadata path from the data path and to serialize concurrent events (to reduce metadata), in the metadata path, in a way that minimizes the impact on the latency perceived by clients.
Cite as

Luís Rodrigues. Causality for the Masses: Offering Fresh Data, Low Latency, and High Throughput. In 21st International Conference on Principles of Distributed Systems (OPODIS 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 95, p. 1:1, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

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@InProceedings{rodrigues:LIPIcs.OPODIS.2017.1,
  author =	{Rodrigues, Lu{\'\i}s},
  title =	{{Causality for the Masses: Offering Fresh Data, Low Latency, and High Throughput}},
  booktitle =	{21st International Conference on Principles of Distributed Systems (OPODIS 2017)},
  pages =	{1:1--1:1},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-061-3},
  ISSN =	{1868-8969},
  year =	{2018},
  volume =	{95},
  editor =	{Aspnes, James and Bessani, Alysson and Felber, Pascal and Leit\~{a}o, Jo\~{a}o},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.OPODIS.2017.1},
  URN =		{urn:nbn:de:0030-drops-86553},
  doi =		{10.4230/LIPIcs.OPODIS.2017.1},
  annote =	{Keywords: Distributed Systems, Causal Consistency}
}
Document
DOI: 10.4230/DagSemProc.04181.1
The Atomic Manifesto: a Story in Four Quarks

Authors: Cliff Jones, David Lomet, Alexander Romanovsky, Gerhard Weikum, Alan Fekete, Marie-Claude Gaudel, Henry F. Korth, Rogerio de Lemos, Eliot Moss, Ravi Rajwar, Krithi Ramamritham, Brian Randell, and Luis Rodrigues

Published in: Dagstuhl Seminar Proceedings, Volume 4181, Atomicity in System Design and Execution (2004)

Abstract
This report summarizes the viewpoints and insights gathered in the Dagstuhl Seminar on Atomicity in System Design and Execution, which was attended by 32 people from four different scientific communities: database and transaction processing systems, fault tolerance and dependable systems, formal methods for system design and correctness reasoning, and hardware architecture and programming languages. Each community presents its position in interpreting the notion of atomicity and the existing state of the art, and each community identifies scientific challenges that should be addressed in future work. In addition, the report discusses common themes across communities and strategic research problems that require multiple communities to team up for a viable solution. The general theme of how to specify, implement, compose, and reason about extended and relaxed notions of atomicity is viewed as a key piece in coping with the pressing issue of building and maintaining highly dependable systems that comprise many components with complex interaction patterns.
Cite as

Cliff Jones, David Lomet, Alexander Romanovsky, Gerhard Weikum, Alan Fekete, Marie-Claude Gaudel, Henry F. Korth, Rogerio de Lemos, Eliot Moss, Ravi Rajwar, Krithi Ramamritham, Brian Randell, and Luis Rodrigues. The Atomic Manifesto: a Story in Four Quarks. In Atomicity in System Design and Execution. Dagstuhl Seminar Proceedings, Volume 4181, pp. 1-5, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2004)

Copy BibTex To Clipboard

@InProceedings{jones_et_al:DagSemProc.04181.1,
  author =	{Jones, Cliff and Lomet, David and Romanovsky, Alexander and Weikum, Gerhard and Fekete, Alan and Gaudel, Marie-Claude and Korth, Henry F. and de Lemos, Rogerio and Moss, Eliot and Rajwar, Ravi and Ramamritham, Krithi and Randell, Brian and Rodrigues, Luis},
  title =	{{The Atomic Manifesto: a Story in Four Quarks}},
  booktitle =	{Atomicity in System Design and Execution},
  pages =	{1--5},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2004},
  volume =	{4181},
  editor =	{Cliff Jones and David Lomet and Alexander Romanovsky and Gerhard Weikum},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DagSemProc.04181.1},
  URN =		{urn:nbn:de:0030-drops-93},
  doi =		{10.4230/DagSemProc.04181.1},
  annote =	{Keywords: Atomic Actions , Transaction Processing , Database Systems , Dependability , Fault Tolerance , Formal Methods , Correctness Reasoning}
}

Rodrigues, Luís

Document
Complete Volume
DOI: 10.4230/LIPIcs.OPODIS.2018
LIPIcs, Volume 125, OPODIS'18, Complete Volume

Authors: Jiannong Cao, Faith Ellen, Luis Rodrigues, and Bernardo Ferreira

Published in: LIPIcs, Volume 125, 22nd International Conference on Principles of Distributed Systems (OPODIS 2018)

Abstract
LIPIcs, Volume 125, OPODIS'18, Complete Volume
Cite as

22nd International Conference on Principles of Distributed Systems (OPODIS 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 125, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

Copy BibTex To Clipboard

@Proceedings{cao_et_al:LIPIcs.OPODIS.2018,
  title =	{{LIPIcs, Volume 125, OPODIS'18, Complete Volume}},
  booktitle =	{22nd International Conference on Principles of Distributed Systems (OPODIS 2018)},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-098-9},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{125},
  editor =	{Cao, Jiannong and Ellen, Faith and Rodrigues, Luis and Ferreira, Bernardo},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.OPODIS.2018},
  URN =		{urn:nbn:de:0030-drops-101742},
  doi =		{10.4230/LIPIcs.OPODIS.2018},
  annote =	{Keywords: Computer systems organization, Dependable and fault-tolerant systems and networks, Computing methodologies, Distributed algorithms, Networks, Mobile networks, Wireless access networks, Ad hoc networks, Software and its engineering, Distributed systems organizing principles,}
}
Document
Front Matter
DOI: 10.4230/LIPIcs.OPODIS.2018.0
Front Matter, Table of Contents, Preface, Conference Organization

Authors: Jiannong Cao, Faith Ellen, Luis Rodrigues, and Bernardo Ferreira

Published in: LIPIcs, Volume 125, 22nd International Conference on Principles of Distributed Systems (OPODIS 2018)

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

22nd International Conference on Principles of Distributed Systems (OPODIS 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 125, pp. 0:i-0:xx, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

Copy BibTex To Clipboard

@InProceedings{cao_et_al:LIPIcs.OPODIS.2018.0,
  author =	{Cao, Jiannong and Ellen, Faith and Rodrigues, Luis and Ferreira, Bernardo},
  title =	{{Front Matter, Table of Contents, Preface, Conference Organization}},
  booktitle =	{22nd International Conference on Principles of Distributed Systems (OPODIS 2018)},
  pages =	{0:i--0:xx},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-098-9},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{125},
  editor =	{Cao, Jiannong and Ellen, Faith and Rodrigues, Luis and Ferreira, Bernardo},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.OPODIS.2018.0},
  URN =		{urn:nbn:de:0030-drops-100607},
  doi =		{10.4230/LIPIcs.OPODIS.2018.0},
  annote =	{Keywords: Front Matter, Table of Contents, Preface, Conference Organization}
}
Document
DOI: 10.4230/LIPIcs.OPODIS.2017.1
Causality for the Masses: Offering Fresh Data, Low Latency, and High Throughput

Authors: Luís Rodrigues

Published in: LIPIcs, Volume 95, 21st International Conference on Principles of Distributed Systems (OPODIS 2017)

Abstract
The problem of ensuring consistency in applications that manage replicated data is one of the main challenges of distributed computing. Among the several invariants that may be enforced, ensuring that updates are applied and made visible respecting causality has emerged as a key ingredient among the many consistency criteria and client session guarantees that have been proposed and implemented in the last decade. Techniques to keep track of causal dependencies, and to subsequently ensure that messages are delivered in causal order, have been widely studied. It is today well known that, in order to accurately capture causality one may need to keep a large amounts of metadata, for instance, one vector clock for each data object. This metadata needs to be updated and piggybacked on update messages, such that updates that are received from remote datacenters can be applied locally without violating causality. This metadata can be compressed; ultimately, it is possible to preserve causal order using a single scalar as metadata, i.e., a Lamport’s clock. Unfortunately, when compressing metadada it may become impossible to distinguish if two events are concurrent or causally related. We denote such scenario a false dependency. False dependencies introduce unnecessary delays and impair the latency of update propagation. This problem is exacerbated when one wants to support partial replication. Therefore, when building a geo-replicated large-scale system one is faced with a dilemma: one can use techniques that maintain few metadata and that fail to capture causality accurately, or one can use techniques that require large metadata (to be kept and exchanged) but have precise information about which updates are concurrent. The former usually offer good throughput at the cost of latency, while the latter offer lower latencies sacrificing throughput. This talk reports on Saturn[1] and Eunomia[2], two complementary systems that break this tradeoff by providing simultaneously high-throughput and low latency, even in face of partial replication. The key ingredient to the success of our approach is to decouple the metadata path from the data path and to serialize concurrent events (to reduce metadata), in the metadata path, in a way that minimizes the impact on the latency perceived by clients.
Cite as

Luís Rodrigues. Causality for the Masses: Offering Fresh Data, Low Latency, and High Throughput. In 21st International Conference on Principles of Distributed Systems (OPODIS 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 95, p. 1:1, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

Copy BibTex To Clipboard

@InProceedings{rodrigues:LIPIcs.OPODIS.2017.1,
  author =	{Rodrigues, Lu{\'\i}s},
  title =	{{Causality for the Masses: Offering Fresh Data, Low Latency, and High Throughput}},
  booktitle =	{21st International Conference on Principles of Distributed Systems (OPODIS 2017)},
  pages =	{1:1--1:1},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-061-3},
  ISSN =	{1868-8969},
  year =	{2018},
  volume =	{95},
  editor =	{Aspnes, James and Bessani, Alysson and Felber, Pascal and Leit\~{a}o, Jo\~{a}o},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.OPODIS.2017.1},
  URN =		{urn:nbn:de:0030-drops-86553},
  doi =		{10.4230/LIPIcs.OPODIS.2017.1},
  annote =	{Keywords: Distributed Systems, Causal Consistency}
}
Document
DOI: 10.4230/DagSemProc.04181.1
The Atomic Manifesto: a Story in Four Quarks

Authors: Cliff Jones, David Lomet, Alexander Romanovsky, Gerhard Weikum, Alan Fekete, Marie-Claude Gaudel, Henry F. Korth, Rogerio de Lemos, Eliot Moss, Ravi Rajwar, Krithi Ramamritham, Brian Randell, and Luis Rodrigues

Published in: Dagstuhl Seminar Proceedings, Volume 4181, Atomicity in System Design and Execution (2004)

Abstract
This report summarizes the viewpoints and insights gathered in the Dagstuhl Seminar on Atomicity in System Design and Execution, which was attended by 32 people from four different scientific communities: database and transaction processing systems, fault tolerance and dependable systems, formal methods for system design and correctness reasoning, and hardware architecture and programming languages. Each community presents its position in interpreting the notion of atomicity and the existing state of the art, and each community identifies scientific challenges that should be addressed in future work. In addition, the report discusses common themes across communities and strategic research problems that require multiple communities to team up for a viable solution. The general theme of how to specify, implement, compose, and reason about extended and relaxed notions of atomicity is viewed as a key piece in coping with the pressing issue of building and maintaining highly dependable systems that comprise many components with complex interaction patterns.
Cite as

Cliff Jones, David Lomet, Alexander Romanovsky, Gerhard Weikum, Alan Fekete, Marie-Claude Gaudel, Henry F. Korth, Rogerio de Lemos, Eliot Moss, Ravi Rajwar, Krithi Ramamritham, Brian Randell, and Luis Rodrigues. The Atomic Manifesto: a Story in Four Quarks. In Atomicity in System Design and Execution. Dagstuhl Seminar Proceedings, Volume 4181, pp. 1-5, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2004)

Copy BibTex To Clipboard

@InProceedings{jones_et_al:DagSemProc.04181.1,
  author =	{Jones, Cliff and Lomet, David and Romanovsky, Alexander and Weikum, Gerhard and Fekete, Alan and Gaudel, Marie-Claude and Korth, Henry F. and de Lemos, Rogerio and Moss, Eliot and Rajwar, Ravi and Ramamritham, Krithi and Randell, Brian and Rodrigues, Luis},
  title =	{{The Atomic Manifesto: a Story in Four Quarks}},
  booktitle =	{Atomicity in System Design and Execution},
  pages =	{1--5},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2004},
  volume =	{4181},
  editor =	{Cliff Jones and David Lomet and Alexander Romanovsky and Gerhard Weikum},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DagSemProc.04181.1},
  URN =		{urn:nbn:de:0030-drops-93},
  doi =		{10.4230/DagSemProc.04181.1},
  annote =	{Keywords: Atomic Actions , Transaction Processing , Database Systems , Dependability , Fault Tolerance , Formal Methods , Correctness Reasoning}
}
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