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Very large repositories may fail initial fetches after 15 minutes
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See PHI1750. Today, Phabricator attempts to use this fetch timeout policy:

  • The initial clone of a repository may take up to 4 hours.
  • Subsequent updates may take up to 15 minutes.


  • DiffusionCommandEngine has a separate 15 minute time limit, which will make the effective initial clone time limit 15 minutes.
  • DiffusionCommandEngine applies a time limit to passthru commands, but passthru commands do not support time limits.
  • On initial import in Git, we fetch every ref. We need to get there eventually, but if we have a large number of refs to fetch we could fetch them individually to make the operation more observable/resumable.