StevenLuMT commented on PR #3372:
URL: https://github.com/apache/bookkeeper/pull/3372#issuecomment-1170118869

   > great work some questions
   > 
   > 1. how do we deal with rollbacks of versions ?
   > 2. is this change backward compatible ?
   
   @eolivelli 
   good question,the code is backward compatible :
   1. when set the existed config ServerConfiguration#setIndexDirName, the new 
cookie will work
   2. when not set this config, the old testcase(CookieTest) do the regression 
testing
   3. if old bookeeper node want to upgrade this cookie, later I will add a new 
pr for adding a funtion in **cookie_generate**


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