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Friday, April 20, 12
Distributed version control
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build it
writecode
check in
get Task
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DVCS @ Unite
Issue Tracker
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DVCS @ Unite
Content Collaboration
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Shaping the future of DVCS
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How Atlassian teams moved from centralised to distributed version control
John Stevenson, UK Ambassador, Atlassian
Making the Switch to DVCS
7
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Importance of Versioning
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Collaboration History of changes Multiple copies
Importance of Versioning
Friday, April 20, 12
Collaboration History of changes Multiple copies
Importance of Versioning
Friday, April 20, 12
Collaboration History of changes Multiple copies
Importance of Versioning
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One repository to rule them all
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One repository to rule them all
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Whats the beefwith Subversion ?
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Subversion
Centralised Version Control
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Centralised Version Control
Subversion
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Centralised Version Control
Subversion
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• Merging hell
• Fear of breaking the build• delayed commits lead
to more merging hell
Subversion issues
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• Merging hell
• Fear of breaking the build• delayed commits lead
to more merging hell
Subversion issues
Friday, April 20, 12
• Merging hell
• Fear of breaking the build• delayed commits lead
to more merging hell
Subversion issues
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• High adoption in Open Source projects
• Enterprises now making the move
• Atlassian teams already migrated
Rise of DVCS
Friday, April 20, 12
• High adoption in Open Source projects
• Enterprises now making the move
• Atlassian teams already migrated
Rise of DVCS
Friday, April 20, 12
• High adoption in Open Source projects
• Enterprises now making the move
• Atlassian teams already migrated
Rise of DVCS
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Everyone is doing it!
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Everyone is doing it!
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Social coding
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Social coding
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Social coding
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Friday, April 20, 12
Enhancing the development cycle
with DVCSFriday, April 20, 12
Distributed Version Control
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Distributed Version Control
Git or Mercurial
Git or Mercurial
Git or Mercurial
Git or MercurialGit or Mercurial
Git or Mercurial
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• Smaller projects• Smaller iterations / continuous deployment• Faster feedback• Greater collaboration & innovation• Understanding customers better
DVCS encourages learning
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What do I need to learn
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What do I need to learn
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Differences in workflow?
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Not just the command line
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Not just the command line
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The command line is like Marmite...
Not just the command line
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”“Distributed Version Control is flexible and can fit any
workflow - you can even treat it like Subversion.
Friday, April 20, 12
”“Distributed Version Control is flexible and can fit any
workflow - you can even treat it like Subversion.
Steve StreetingCreator of SourceTree
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Centralised Vs Distributed
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Classic Vs Re-imagined
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How did Atlassian do it?
Recipe for DVCS adoption
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How did Atlassian do it?
Recipe for DVCS adoption
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Atlassian DVCS recipe
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Atlassian DVCS recipe
Tooling
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Git and Mercurial Mac Client
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Git and Mercurial Mac Client
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Commits to SVN & DVCS reposBrowse source inSubversion, Git, Hg, CVS, etc.
Browse and Search source across versioning tools
Friday, April 20, 12
Commits to SVN & DVCS reposBrowse source inSubversion, Git, Hg, CVS, etc.
Browse and Search source across versioning tools
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Source code disinfectant
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Source code disinfectant
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• Run same builds against old and new VCS
• Continuous Validation• Separate repos for integration
Continuous Integration and release management
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• Run same builds against old and new VCS
• Continuous Validation• Separate repos for integration
Continuous Integration and release management
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Link every commit to JIRA issues
Friday, April 20, 12
Link every commit to JIRA issues
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Atlassian DVCS recipe
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Atlassian DVCS recipe
Practices
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Incremental change
• Try on small projects• Use hybrid tooling
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Bringing our history with us
Friday, April 20, 12
Bringing our history with us
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Atlassian DVCS recipe
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Atlassian DVCS recipe
Experience
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DVCS mentor
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DVCS mentor
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DVCS mentor
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Code without Limitations
• Fork & Clone• Repositories are cheap,
don't be afraid to mess up
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Commit Early, Commit Often
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Commit Early, Commit Often
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Atlassian DVCS
Friday, April 20, 12
Atlassian DVCS
Benefits
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Benefit: Developer Speed
• Common commands, just faster• Fast tools = happy developers• Complete history at hand
Friday, April 20, 12
Benefit: Developer Speed
• Common commands, just faster• Fast tools = happy developers• Complete history at hand
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• More lessons learnt• Issues resolved more timely• Less risk and impact to a project• More in tune with customers
Benefit: Fast Feedback
Friday, April 20, 12
• More lessons learnt• Issues resolved more timely• Less risk and impact to a project• More in tune with customers
Benefit: Fast Feedback
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DVCS @ Atlassian
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DVCS @ Atlassian
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• DVCS has great business and technical benefits• Atlassian is shaping the future of DVCS
Wrap up
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blogs.atlassian.comsourcetreeapp.com
blog.jr0cket.co.uk@jr0cket
Thank you
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