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Documents authored by Schulte, Wolfram

Document
Invited Talk
DOI: 10.4230/LIPIcs.ECOOP.2017.1
Challenges to Achieving High Availability at Scale (Invited Talk)

Authors: Wolfram Schulte

Published in: LIPIcs, Volume 74, 31st European Conference on Object-Oriented Programming (ECOOP 2017)

Abstract
Facebook is a social network that connects more than 1.8 billion people. To serve these many users requires infrastructure which is composed of thousands of interdependent systems that span geographically distributed data centers. But what is the guiding principle for building and operating these systems? For Facebook’s infrastructure teams the answer is: Systems must always be available and never lose data. This talk will explore this quest. We will focus on three aspects. Availability and consistency. What form of consistency do Facebook’s systems guarantee? Strong consistency makes understanding easy but has latency penalties, weak consistency is fast but difficult to reason for developers and users. We describe our usage of eventual consistency and delve into how Facebook constructs its caching and replicated storage systems to minimize the duration for achieving consistency. We share empirical data that measures the effectiveness of our design. Availability and correctness. With network partitions, relaxed forms of consistency, and software bugs, how do we guarantee a consistent state? We present two systems to find and repair structural errors in Facebook’s social graph, one batch and one real-time. Availability and scale. Sharding is one of the standard answers to operate at scale. But how can we develop one system that can shard storage as well as compute? We will introduce a new Sharding-as-a-Service component. We will show and evaluate how its design and service policies control for latency, failure tolerance and operationally efficiency.
Cite as

Wolfram Schulte. Challenges to Achieving High Availability at Scale (Invited Talk). In 31st European Conference on Object-Oriented Programming (ECOOP 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 74, p. 1:1, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017)

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@InProceedings{schulte:LIPIcs.ECOOP.2017.1,
  author =	{Schulte, Wolfram},
  title =	{{Challenges to Achieving High Availability at Scale}},
  booktitle =	{31st European Conference on Object-Oriented Programming (ECOOP 2017)},
  pages =	{1:1--1:1},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-035-4},
  ISSN =	{1868-8969},
  year =	{2017},
  volume =	{74},
  editor =	{M\"{u}ller, Peter},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2017.1},
  URN =		{urn:nbn:de:0030-drops-72503},
  doi =		{10.4230/LIPIcs.ECOOP.2017.1},
  annote =	{Keywords: Distributed Systems, Availability, Reliability, Fault Tolerance, Consistency, Scalability, Replication, Sharding, Caching}
}
Document
DOI: 10.4230/LIPIcs.ICLP.2011.73
Canonical Regular Types

Authors: Ethan K. Jackson, Nikolaj Bjørner, and Wolfram Schulte

Published in: LIPIcs, Volume 11, Technical Communications of the 27th International Conference on Logic Programming (ICLP'11) (2011)

Abstract
Regular types represent sets of structured data, and have been used in logic programming (LP) for verification. However, first-class regular type systems are uncommon in LP languages. In this paper we present a new approach to regular types, based on type canonization, aimed at providing a practical first-class regular type system.
Cite as

Ethan K. Jackson, Nikolaj Bjørner, and Wolfram Schulte. Canonical Regular Types. In Technical Communications of the 27th International Conference on Logic Programming (ICLP'11). Leibniz International Proceedings in Informatics (LIPIcs), Volume 11, pp. 73-83, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2011)

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@InProceedings{jackson_et_al:LIPIcs.ICLP.2011.73,
  author =	{Jackson, Ethan K. and Bj{\o}rner, Nikolaj and Schulte, Wolfram},
  title =	{{Canonical Regular Types}},
  booktitle =	{Technical Communications of the 27th International Conference on Logic Programming (ICLP'11)},
  pages =	{73--83},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-31-6},
  ISSN =	{1868-8969},
  year =	{2011},
  volume =	{11},
  editor =	{Gallagher, John P. and Gelfond, Michael},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICLP.2011.73},
  URN =		{urn:nbn:de:0030-drops-31806},
  doi =		{10.4230/LIPIcs.ICLP.2011.73},
  annote =	{Keywords: Regular types, Canonical forms, Type canonizer}
}
Document
DOI: 10.4230/DagSemProc.10111.1
10111 Abstracts Collection – Practical Software Testing : Tool Automation and Human Factors

Authors: Mark Harman, Henry Muccini, Wolfram Schulte, and Tao Xie

Published in: Dagstuhl Seminar Proceedings, Volume 10111, Practical Software Testing : Tool Automation and Human Factors (2010)

Abstract
From March 14, 2010 to March 19, 2010, the Dagstuhl Seminar 10111 ``Practical Software Testing : Tool Automation and Human Factors'' was held in Schloss Dagstuhl~--~Leibniz Center for Informatics. During the seminar, several participants presented their current research, and ongoing work and open problems were discussed. Abstracts of the presentations given during the seminar as well as abstracts of seminar results and ideas are put together in this paper. The first section describes the seminar topics and goals in general. Links to extended abstracts or full papers are provided, if available.
Cite as

Mark Harman, Henry Muccini, Wolfram Schulte, and Tao Xie. 10111 Abstracts Collection – Practical Software Testing : Tool Automation and Human Factors. In Practical Software Testing : Tool Automation and Human Factors. Dagstuhl Seminar Proceedings, Volume 10111, pp. 1-11, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2010)

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@InProceedings{harman_et_al:DagSemProc.10111.1,
  author =	{Harman, Mark and Muccini, Henry and Schulte, Wolfram and Xie, Tao},
  title =	{{10111 Abstracts Collection – Practical Software Testing : Tool Automation and Human Factors}},
  booktitle =	{Practical Software Testing : Tool Automation and Human Factors},
  pages =	{1--11},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2010},
  volume =	{10111},
  editor =	{Mark Harman and Henry Muccini and Wolfram Schulte and Tao Xie},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.10111.1},
  URN =		{urn:nbn:de:0030-drops-26267},
  doi =		{10.4230/DagSemProc.10111.1},
  annote =	{Keywords: Software testing, Test generation, Test automation, Test oracles, Testing tools, Human-computer interaction, Code-based testing, Specification-based testing}
}
Document
DOI: 10.4230/DagSemProc.10111.2
10111 Executive Summary – Practical Software Testing: Tool Automation and Human Factors

Authors: Mark Harman, Henry Muccini, Wolfram Schulte, and Tao Xie

Published in: Dagstuhl Seminar Proceedings, Volume 10111, Practical Software Testing : Tool Automation and Human Factors (2010)

Abstract
The main goal of the seminar ``Practical Software Testing: Tool Automation and Human Factors'' was to bring together academics working on algorithms, methods, and techniques for practical software testing, with practitioners, interested in developing more soundly-based and well-understood testing processes and practices. The seminar's purpose was to make researchers aware of industry's problems, and practitioners aware of research approaches. The seminar focused in particular on testing automation and human factors. In the week of March 14-19, 2010, 40 researchers from 11 countries (Canada, France, Germany, Italy, Luxembourg, the Netherlands, Sweden, Switzerland, South Africa, United Kingdom, United States) discussed their recent work, and recent and future trends in software testing. The seminar consisted of five main types of presentations or activities: topic-oriented presentations, research-oriented presentations, short self-introduction presentations, tool demos, and working group meetings and presentations.
Cite as

Mark Harman, Henry Muccini, Wolfram Schulte, and Tao Xie. 10111 Executive Summary – Practical Software Testing: Tool Automation and Human Factors. In Practical Software Testing : Tool Automation and Human Factors. Dagstuhl Seminar Proceedings, Volume 10111, pp. 1-5, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2010)

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@InProceedings{harman_et_al:DagSemProc.10111.2,
  author =	{Harman, Mark and Muccini, Henry and Schulte, Wolfram and Xie, Tao},
  title =	{{10111 Executive Summary – Practical Software Testing: Tool Automation and Human Factors}},
  booktitle =	{Practical Software Testing : Tool Automation and Human Factors},
  pages =	{1--5},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2010},
  volume =	{10111},
  editor =	{Mark Harman and Henry Muccini and Wolfram Schulte and Tao Xie},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.10111.2},
  URN =		{urn:nbn:de:0030-drops-26234},
  doi =		{10.4230/DagSemProc.10111.2},
  annote =	{Keywords: Software testing, Test generation, Test automation, Test oracles, Testing tools, Humancomputer interaction, Code-based testing, Specification-based te}
}
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