Objective

Creation of a dataset containing data and information about software development

What is Github?

• Social coding
• Social network
• Development of software components

Data in Github?

• ~Static
  • The social network (users & repositories)
• Dynamic
  • Events of every user & repository

Github Data Model

http://www.dmst.aueb.gr/dds/pubs/conf/2012-MSR-GitHub/html/github-mirror.html

More specifically...

• Users
  • Repositories
    • Issues
    • Milestones
    • Commits
    • Collaborators
    • Downloads
    • Pull-requests
    • Labels
    • Comments

Github Events (18 types)

• IssuesEvent
• MemberEvent
• PageBuildEvent
• PublicEvent
• PullRequestEvent
• PullRequestReview-CommentEvent
• PushEvent
• ReleaseEvent
• StatusEvent
• TeamAddEvent
• WatchEvent

• CommitCommentEvent
• CreateEvent
• DeleteEvent
• DeploymentEvent
• DeploymentStatusEvent
• DownloadEvent
• FollowEvent
• ForkEvent
• ForkApplyEvent
• GistEvent
• GollumEvent
• IssueCommentEvent​

How to access data?

1. Github API in different programming languages
2. Direct JSON requests
   • https://api.github.com/
3. Github Archive (daily events)
   • http://www.githubarchive.org/
4. Google Big Query
   • https://bigquery.cloud.google.com/table/githubarchive:github.timeline
   • https://bigquery.cloud.google.com/table/publicdata:samples.github_nested
   • https://bigquery.cloud.google.com/table/publicdata:samples.github_timeline

Creation of the Github dataset

• Using the Github API library for Java
  • User and Repositories
  • Repositories: commits, collaborators, downloads, issues, labels and milestones
  • Serialization:
    • CSV files
    • Neo4j as a graph
• Support also for querying Google Big Query from Java

My user

...more nodes...

Some stats & limitations

• 8,526,145 (potential number of users, actually less than that)
  • 400,000 users (logins have been gathered)
• 135 users are fully described 
  • Some memory problems (because of commits)...
  • Neo4j in standlone-mode (no server)
• 5000 requests/hour per authenticated user

What's next?

• Establish which dataset is more relevant...
  • Static
  • Dynamic (events)
  • Both
  • ...full creation! (it takes time...)
• Relational machine learning model
  • Multimode
  • Timestamp in most of events and entities
• Heuristics to determine the "best projects"
  • Followers
  • Downloads
  • Pull-requests
  • Commits
  • ...

Related Works

• SAGH: A Social Analysis tool for GitHub
  • A developer recommendation system (and other metrics)
    • http://snap.stanford.edu/class/cs224w-2012/projects/cs224w-015-final.pdf
• An Analysis of GitHub’s Collaborative Software Network
  • Link Prediction
    • http://snap.stanford.edu/class/cs224w-2012/projects/cs224w-050-final.v01.pdf
• Network Structure of Social Coding in GitHub
  • http://www.mysmu.edu/faculty/lxjiang/papers/csmr13github.pdf
  • http://ink.library.smu.edu.sg/cgi/viewcontent.cgi?article=2686&context=sis_research
• Coding Together at Scale: GitHub as a Collaborative Social Network
  • ​Analysis of the geographical activity
    • ​http://arxiv.org/abs/1407.2535  
    • http://www.cs.bham.ac.uk/~musolesm/papers/icwsm14_github.pdf