The Onion Patch: Migration in Open Source Ecosystems
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Slides for "The Onion Patch: Migration in Open Source Ecosystems", by Corey Jergensen, Anita Sarma, and Patrick Wagstrom. Presented at ESEC/FSE 2011 in Szeged, Hungary

Slides for "The Onion Patch: Migration in Open Source Ecosystems", by Corey Jergensen, Anita Sarma, and Patrick Wagstrom. Presented at ESEC/FSE 2011 in Szeged, Hungary

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  • Spoiler Alert: We found little evidence of the onion model in our data. We did, however, find lots of other interesting things
  • Remember to say that “we are scoping to some of the more novel findings in our work. Our research questions and hypotheses that drove our work can be found in the paper, along with the stats that go with it.”
  • Onion modelFirst socialization then technical contributionHowever, the immigration model is based on stand alone projectsToday, the norm is well-connected ecosystemsNo findings as of yet on socialization processes in an ecosystem
  • We have all of the code, mailing lists, and bugs for each of these projects.The people were unified across projects through a variety of methods – email address was easiest. In many cases we needed to work with experts in the community to get the resolution we needed.
  • The centers of the circles indicate the number of developers working on the project.The lines indicate the number of developers shared between the projects.Not all lines are shown because it is a clique, and that would be a very messy and unpretty graph
  • After discovering that there is a significant migration we wanted to actually examine the onion model and how it works within a project and ecosystem.These are samples of the five different models of joining that we found in the system.Note, we’re only looking at progression patterns of people who eventually became committers.
  • Notes: This only covers people who eventually became committers
  • Notes: This only covers people who eventually became committersNext we evaluated progressions across the ecosystem – we basically looked at contributions as though everything in the ecosystem was a single projctWe start to see a trend here, but it’s just across six project. If we had the data to extend it more then we might see more people fall in to the technical-social patterns
  • We did a simple regression that mapped together activity on the mailing lists and bug trackers to relate to commits.
  • That’s Hungarian for “Who are these people?”Shuíshìzhèxiērén?

The Onion Patch: Migration in Open Source Ecosystems The Onion Patch: Migration in Open Source Ecosystems Presentation Transcript

  • The Onion Patch: Migration in Open Source Ecosystems
    Corey Jergensen*
    Anita Sarma*
    Patrick Wagstrom+
    * University of Nebraska, Lincoln
    + IBM TJ Watson Research Center
  • 2
    Not sure if this a paper about
    ogres, software development,or cooking
    September 7, 2011
  • This Talk in One Slide
    The Onion Model proposed a model for developers to join individual projects
    Ecosystems change the project landscape
    Similar social norms and technical requirements across projects in an ecosystem lower barrier to entry
    We examine how an ecosystem alters the ways in which developers join projects
    3
    September 7, 2011
  • Spoiler Alert – Our Findings
    There are different progression paths that can be followed
    Tenure does not necessarily mean more central contribution
    Different Classes of Committers Exist
    Little concrete evidence of the Onion model
    4
    September 7, 2011
  • Overview
    The Onion Model
    Primary Research Questions
    Our data
    Progression paths
    Effect of tenure on commit centrality
    Committer classes
    Implications
    5
    September 7, 2011
  • Layers – Like an Onion
    Users
    Social
    Mailing Lists
    Contributors
    Socio-Technical
    Bug Trackers
    Core
    Code
    Technical
    6
    September 7, 2011
  • Research Questions
    Does Migration Occur in Ecosystems?
    When a developer migrates, can they kickstart participation with pre-existing knowledge?
    In interconnected ecosystems, what factors affect contribution type and quality?
    7
    September 7, 2011
  • The GNOME Project
    We examined subset of six successful projects
    Between 369 and 1085 people active across email, bug tracker, and code repository
    Both GUI tools and underlying libraries
    Up to 10 years of history
    8
    September 7, 2011
  • Does Migration Exist?
    September 7, 2011
    9
    716
    541
    122
    120
    169
    162
    123
    369
    475
    181
    69
    164
    133
    166
    107
    690
    1085
    112
  • Progression Paths
    10
    Release 2
    Release 1
    Release 3
    Bugs
    Code
    Mail
    Socio Technical
    Code
    Mail
    Bugs
    Accelerated
    Mail
    Code
    Bugs
    TechSocial
    Code
    Bugs
    Technical
    Code
    Source Only
    September 7, 2011
  • Findings of Progression Paths - Project
    11
    September 7, 2011
  • Findings of Progression Paths - Ecosystem
    12
    September 7, 2011
  • Centrality of Commits
    Difference between being a committer and being a core committer
    Previous research has shown that core does most of the work on most projects
    Once becoming a committer, what factors affect relationship to core?
    13
    September 7, 2011
  • Commit 1
    Calculating Source Code Centrality
    14
    foo.c
    bar.c
    Commit 2
    baaz.c
    Alice
    quux.c
    Bob
    September 7, 2011
  • Centrality
    Time
    Tenure != Centrality
    Simple Story
    Mail Activity +
    Tracker Activity +
    Project Experience -
    Detailed Story
    Mail Activity +
    Tracker Activity +
    New to Project +
    Middle Aged +
    Experienced ???
    15
    September 7, 2011
  • Major Factors Affecting Centrality
    16
    Artifacts Created
    • Source Commits
    • Bugzilla Activity & Comments
    • Mailing List Messages
    Single Project Experience
    • Prior Experience
    • Total Ecosystem Experience
    • Project Experience
    Component 2
    Component 1
    Broad Social Experience
    • Translation Commits
    • Mailing List Messages
    • Prior Experience
    • Ecosystem Experience
    • Project Experience
    • Active Experience
    Technical Medium Experience
    • Source Commits
    • Mailing Lists
    • Tracker Activity
    • Prior Experience
    • Active Experience
    Component 3
    Component 4
    September 7, 2011
  • Kikezekazemberek?
    Translators!
    Common infrastructure used across projects
    “Parachute in” to implement internationalization
    Individual translators can work only on the translation files without needing to hack project code
    17
    WersinddieseLeute?
    Who are these people?
    谁是这些人?
    September 7, 2011
  • Implications?
    Open Source is kinda like an onion, but for the most part it isn’t
    There is a need for project stewards as well as code warriors
    Common Infrastructure enables ecosystem migration
    Ecosystems have changed our views
    When hiring
    question should not be “What have you done on project X”?
    Rather “Show me everything that you’ve done on Github.”
    StackExchange for example accrues karma across all boards
    For researching
    Is socialization process taking place through social media?
    Are layers of the onion model being created outside of traditional Software Engineering artifacts
    Is karma/credits already known intrinsically by the community and leading to following?
    18
    September 7, 2011