How Does Contributors' Involvement Influence the Build Status of an Open-Source Software Project?

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1. Marcel Rebouças How Does Contributors’ Involvement Influence the Build Status

   of an Open-Source Software Project? Renato Olivera Gustavo Pinto Fernando Castor mscr@cin.ufpe.br ros3@cin.ufpe.br gpinto@ufpa.br castor@cin.ufpe.br

2. Motivation (1/3) Casual contributors represent a large part of the

   OSS community (49%) and their contributions are far from trivial.

3. Motivation (2/3) Only 20% of the new contributors on OSS

   projects become long-term members.

4. Motivation (3/3) Lack of awareness and guidance during their first

   steps makes it hard to contribute!

5. They have little or no prior knowledge on the project

   domain Casual Contributors They might put more effort to create their first pull- request

6. Are casual contributors more prone to create a failing build?

   Research Question

7. Methodology TravisTorrent TravisCI CI Build Data Commiter Data Dataset Dataset

   without duplicated users User Disambiguation Technique Data Cleaning Dataset with 1,074 curated projects Data Processing Data Statistical Tests

8. Data Overview 1,074 projects 35,360 users 619,370 builds

9. Data Overview # Users 0 5000 10000 15000 20000 Builds

   1 2 3 4 5+ 0 150000 300000 450000 600000 Casual Non-Casual 1,074 projects 35,360 users 619,370 builds # Builds

10. Results 0 250 500 750 1000 No difference Higher Casual

    Success Lower Casual Success Being a casual contributor is not a strong indicator for creating failing builds # Number of Projects

11. 0 22.5 45 67.5 90 0 1.15 2.3 3.45 4.6

    Results Casual contributions are smaller, both in modified source-code lines and modified files Median of Modified LoC Median of Modified Files

12. 0 1.15 2.3 3.45 4.6 No difference Higher Casual Success

    Lower Casual Success Results Projects in which casuals fail more than non-casuals run more jobs per build. Median of jobs per build

13. Take-Away Message Are you a casual contributor?

14. Take-Away Message Are you a casual contributor? Go ahead and

    contribute!
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19. gpinto@ufpa.br @gustavopinto