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Research on Version Control Systems: Insights from UW Autumn 2011 ESEC/FSE Conference

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This document summarizes the research presented by the CSE 331 Software Design & Implementation class at the University of Washington during the 2011 Joint European Software Engineering Conference and ACM SIGSOFT Symposium. It details the differences between centralized and decentralized version control systems, their functionality, and their significance for collaborative projects. Highlights include the benefits of tools like Git and Mercurial, which facilitate efficient code management and conflict resolution, enhancing team productivity and reducing data loss.

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Research on Version Control Systems: Insights from UW Autumn 2011 ESEC/FSE Conference

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  1. CSE 331Software Design & Implementationversion control research @ UW Autumn 2011

  2. Version control: research @ UW • Two trailers…for a research talk and a research demo at the 2011 Joint European Software Engineering Conference and  ACM SIGSOFT Symposium on the Foundations of Software Engineering (ESEC/FSE) • http://www.youtube.com/watch?v=qtWqU4ac-IM • http://www.youtube.com/watch?v=Iargb4vdEMo

  3. Version control • Tools intended to help teams of people work concurrently and on shared code – both are needed for a collaborative project to make genuine progress • Track multiple versions and variants • Help identify and manage conflicts • Reduces chances of data loss wikipedia

  4. Centralized version control • The standard client-server approach of the first decades of version control – SCCS, RCS, CVS, SVN, … • A server holds the “real” repository – it represents the core reality of the project • Team members check-out and work on copies of the repository • When they check-in those changes, they are checked against the repository and it is updated • Handling merges must be done if there are conflicts

  5. Decentralized version control • Developed in the past decade, taking a more independent peer-to-peer approach for versioning • Every copy is a full-fledged repository – if there is a “main” repository it is only by agreement • There is an explicit separation between a repository and a working copy of that repository • Repositories are synchronized by exchanging change-sets • Allows fast operations (committing or reverting changes, for example), because they are done locally • Only need to interact with peers when synchronizing changes • Examples: git, mercurial (hg), bazaar, monotone, …

  6. More differences • Code from disparate repositories can be merged in more flexible ways – often (especially in open source projects) based on a web-of-trust relationship – change-sets can be applied for a person without “committer” status • Participation in projects does not require permission • Local and remote repositories are synced using different commands • Private, revision-controlled workis allowed – this is hard in centralized version control • Users can use their revision control system even for exploratory work • No single machine remains as a point of failure

  7. A UW research project: Crystal

  8. Next steps • Worksheet A: due in class on Monday • 5% extra credit if you have it in on time and grade with the class during Monday lecture • Worksheet B: available Monday PM • Wednesday: Brief final review; course evaluations • Friday: repeat of Monday, including extra credit, for Worksheet B • Final: 14:30-16:20 Wednesday December 14 • Intended to be one hour, but you can take the whole time

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