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The ResourceManager is a MASTER component, and the command script is scripts/resourcemanager.py, which can be found in the services/YARN/package directory. That command script is PYTHON and that script implements the default commands as python methods. This is the install method for the default install INSTALL command:

class Resourcemanager(Script):
  def install(self, env):
    self.install_packages(env)
    self.configure(env)

You can also see a custom command is defined DECOMMISSION, which means there is also a decommission method in that python command script:

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