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As of August, they think they are on their way to a solution: http://www.quora.com/Facebook-Engineering/Has-Facebook-solved-their-large-Git-repository-problem-y

• justinmk 14y ago
  Fascinating. Thanks for the link. Sam mentions in the thread: With the hard–working part of git on the other end of a network service, you could back it by a re–implementation of git which is written to be distributed in Hadoop. There are at least two similar implementations of git that are like this: one for cassandra which was written by github as a research project, and Google's implementation on top of their BigTable/GFS/whatever. It will be interesting to see how FB approaches it.