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  • we have to introduce a clear concept of "file layout version" (JV)
  • write a file layout version in the Cookie (Sijie)
  • write file version on each file (Enrico)
  • use a configuration property to force the bookie to use an older format (Enrico)
  • maybe the bookie will be able to start if you remove all new version file (Sijie)

About Journal: we can add a "mask" in order to understand "special" entries in the Journal and let old versions skip special entry types which are not know (JV)