docs: def _hadoop_cmd(module, command, *args):
      '''
         Hadoop/hdfs command wrapper
  
         As Hadoop command has been deprecated this module will default
         to use hdfs command and fall back to hadoop if it is not found
  
         In order to prevent random execution the module name is checked
  
         Follows hadoop command template:
            hadoop module -command args
         E.g.: hadoop dfs -ls /
      '''
      tool = 'hadoop'
      if salt.utils.path.which('hdfs'):
          tool = 'hdfs'
  
      out = None
      if module and command:
          if module in __authorized_modules__:
              mappings = {'tool': tool, 'module': module, 'command': command, 'args': ' '.join(args)}
              cmd = '{tool} {module} -{command} {args}'.format(**mappings)
              out = __salt__['cmd.run'](cmd, python_shell=False)
          else:
              return 'Error: Unknown module'
      else:
          return 'Error: Module and command not defined'
      return out