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For example, in the YARN Service describes the ResourceManager component as follows in metainfo.xml:

Code Block
        <component>
          <name>RESOURCEMANAGER</name>
          <category>MASTER</category>
          <commandScript>
            <script>scripts/resourcemanager.py</script>
            <scriptType>PYTHON</scriptType>
            <timeout>600</timeout>
          </commandScript>
          <customCommands>
            <customCommand>
              <name>DECOMMISSION</name>
              <commandScript>
                <script>scripts/resourcemanager.py</script>
                <scriptType>PYTHON</scriptType>
                <timeout>600</timeout>
              </commandScript>
            </customCommand>
          </customCommands>
        </component>

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 command:

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