Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Mercurial is a tool for creating and managing code changes used at Facebook. Facebook started out on Git, but it began hitting scaling limits in around 2012. Mercurial's developers were receptive to the idea of Facebook engineers contributing patches to scale it better while Git's developers were not. There were other alternatives, but all were quickly disqualified. Facebook adopted Mercurial not because it had better technology, but because the maintainers and codebase felt more open.

Julie Zhuo, a renowned Silicon Valley executive and management author, rose from an intern to the VP of Product Design at Facebook through her unique strength in bridging engineering and design disciplines. Now a co-founder of Sundial, she uses her management expertise to foster a strong employee culture and continues to embrace the learning journey, sharing insights with over 70,000 newsletter subscribers.

Facebook uses Mercurial instead of Git. While performance limitations triggered the migration, the key deciding factor in the choice proved to be the openness and collaborative spirit of the Mercurial community. Facebook's success in smoothly migrating its engineering org was thanks to thoughtful communication and human elements alongside other technical reasons.

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