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Empirical Software Engineering

Erschienen in:

08.10.2020

On the fulfillment of coordination requirements in open-source software projects: An exploratory study

verfasst von: Claus Hunsen, Janet Siegmund, Sven Apel

Erschienen in: Empirical Software Engineering | Ausgabe 6/2020

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Abstract

In large-scale open-source software projects, where developers are often distributed across the entire planet, coordination among developers is crucial. To estimate whether a state of socio-technical congruence is achieved, which is associated with software quality and project success, we assess the alignment of collaboration and communication in such software projects in terms of coordination requirements. By means of an empirical study on a substantial set of large-scale open-source software projects—the development histories of all projects sum up to over 180 years—we aim at shedding light on this issue. To this end, to take a more semantic view on this phenomenon in comparison to previous work, we do not only identify coordination requirements arising from files and functions only, but also those arising from features. We found that open-source developers fulfill coordination requirements intentionally, but mostly those coordination requirements that arise from coupled source-code artifacts, while they resolve simpler ones independently. Furthermore, neither of the considered abstraction levels of source-code artifacts (files, functions, features) is more suitable to construct coordination requirements with respect to their fulfillment. This finding strongly indicates that features do not play an as important role in the development process as expected and commonly believed by the research community in the area of feature-oriented and feature-driven development. Finally, we identified notable evolutionary trends in the fulfillment of coordination requirements and showed that far-reaching social events (such as organizational issues) have a huge impact on their fulfillment, both negatively and positively. The key findings of our empirical study are that socio-technical relations are important to understand open-source development communities and that the incorporation of different abstraction levels for developer collaboration does yield important insights to further improve the evolution in open-source software projects.

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We could define “positive” and “negative” motifs to capture the fulfillment of coordination requirements directly; but to keep the analysis simple, we define only motifs for the coordination requirements as such and analyze whether the identified coordination requirements are fulfilled or not.

There are various techniques to implement features, we analyze preprocessor annotations. More details in Section 4.1.

For example, see http://wiki.qemu.org/Contribute/SubmitAPatch (accessed: 2018-11-05).

http://siemens.github.io/codeface/

In our analysis implementation, we use “:: ” as separator, but for readability reasons, we write “/ ” in this paper.

http://fosd.net/cppstats/

As a simple scenario, changing indentation from tabs to spaces in 1,415 files at once gives rise to more than 1 million edges representing logical coupling among these files. However, such far-spreading changes are likely not functionality changes (Hindle et al. 2008), so we aim at reducing their impact by omitting them during network construction.

http://github.com/se-passau/coronet/

We use the Wilcoxon signed-rank test because the number of available data points is rather small in our analysis and the data for some subject projects cannot be assumed to be normally distributed (Shapiro-Wilk test, p < 0.1). This also holds for other hypotheses and corresponding statistical analyses.

We did not analyze further projects as the obtained results do not fully compensate for the large amount of computing time for the additional data. Nevertheless, we argue that the selected subset of projects is sufficient to identify indicators.

To be able to compare coordination requirements among different abstraction levels—they include information on two developers and, at least, one source-code artifact, as we define in Section 2.3—, we stripped the artifact information from them.

We omit the plots for the square motif due to space restrictions. We refer to the supplementary website for all data and plots. See also Section 5.5.2.

The upcoming description of events is based on the following list of references (all accessed 2018-11-05):

the announcement: https://ffmpeg.org/archive.html#return_to_freedom, and
further detailed information from (former) FFmpeg contributors: https://lwn.net/Articles/424396/, http://blog.pkh.me/p/13-the-ffmpeg-libav-situation.html, and https://www.slideshare.net/SamsungOSG/ffmpeg-a-retrospective.

http://heartbleed.com/ (accessed 2018-11-05)

The upcoming description of events is based on the following list of references (all accessed 2019-03-14):

https://wiki.qemu.org/OlderNews (accessed 2018-11-05)

We also discuss this threat to construct validity in Section 7.

See the following references: https://dwheeler.com/essays/heartbleed.html, https://news.ycombinator.com/item?id=7556826, https://www.theregister.co.uk/Print/2014/04/11/openssl_heartbleed_robin_seggelmann/ (all accessed 2019-03-15)

This information could be accessed through the motif identification, which we describe in Section 2.3.

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Titel: On the fulfillment of coordination requirements in open-source software projects: An exploratory study
verfasst von: Claus Hunsen
Janet Siegmund
Sven Apel
Publikationsdatum: 08.10.2020
Verlag: Springer US
Erschienen in: Empirical Software Engineering / Ausgabe 6/2020
Print ISSN: 1382-3256
Elektronische ISSN: 1573-7616
DOI: https://doi.org/10.1007/s10664-020-09833-8

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