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Each stack-version includes services which are either referenced from common-services, or defined inside the stack-version's services folder. 
Services are defined in common-services if they will be shared across multiple stacks. If they will never be shared, then they can be defined inside the stack-version.

Reference common-services

To reference a service from common-services, the service descriptor file should use the <extends> element. (Example: HDFS in HDP-2.0.6)

<metainfo>
  <schemaVersion>2.0</schemaVersion>
  <services>
    <service>
      <name>HDFS</name>
      <extends>common-services/HDFS/2.1.0.2.0</extends>
    </service>
  </services>
</metainfo>

 Define

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Service

In exactly the same format as services defined in common-services, a new service can be defined inside the services folder.

Example: : HDFS in BIGTOP-0.8.

Extend Service

When a stack-version extends another stack-version, it inherits all details of the parent service. It is also free to override and remove any portion of the inherited service definition.

Examples:

• HDP-2.3 / HDFS - Adding NFS_GATEWAY component, updating service version and OS specific packages
• HDP-2.2 / Storm - Deleting STORM_REST_API component, updating service version and OS specific packages
• HDP-2.3 / YARN - Deleting YARN node-label configuration from capacity-scheduler.xml
• HDP-2.3 / Kafka - Add Kafka Broker Process alert

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