• 100: KEEPE IT SIMPLEME How works a hierarchical data lookup?
• Query a key
• Albero is composed of 2 parts:
  • It will first look in different locations the key. It is usually files, but it can also be an url or anything.
• Lookup data in a tree of files
  • Goes sequentially according the backends list
  • Backend/Engine list is modular
  • Engine Plugin: Jerakia/HIera/Ansible/Curl
  • Backend Plugin: loop/hier
  • All result are returned, and then the rules are applied
  • Rules match to a key and apply a strategy (essentially determine if and how the different value are merged or replaced). It can also apply filter to the result and modify its content (future).
  • This is modular
  • Strategy: last/schema
    • Last will always take the last found value, whatever what it previously found. schema
    • schema: It will take into account the strucutre of the data and try to merge them intelligentelly. See more on schema
  • Then it returns the result