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...

  def decommission(self, env):
    import params

    ...

    Execute(yarn_refresh_cmd,
            user=yarn_user
    )
    pass

Using Stack Inheritance

Stacks can extend other Stacks in order to share command scripts and configurations. This reduces duplication of code across Stacks.

For example, the HDP 2.1.1 Stack extends HDP 2.0.6 Stack so only the changes applicable to HDP 2.1.1 are present in that Stack definition. The extension is defined in the metainfo.xml for HDP 2.1.1 Stack:

<metainfo>
  <versions>
    <active>true</active>
  </versions>
  <extends>2.0.6</extends>
</metainfo>

Metrics

TBD