ambari/ambari-server/src/main/resources/stacks/HDP/2.1/services/YARN/metainfo.xml

<?xml version="1.0"?>
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<metainfo>
  <schemaVersion>2.0</schemaVersion>
  <services>
    <service>
      <name>YARN</name>
      <comment>Apache Hadoop NextGen MapReduce (YARN)</comment>
      <version>2.4.0.2.1</version>
      <components>

        <component>
          <name>APP_TIMELINE_SERVER</name>
          <category>SLAVE</category>
          <cardinality>1</cardinality>
          <commandScript>
            <script>scripts/application_timeline_server.py</script>
            <scriptType>PYTHON</scriptType>
            <timeout>600</timeout>
          </commandScript>
        </component>


      </components>

      <osSpecifics>
        <osSpecific>
          <osFamily>any</osFamily>
          <packages>
            <package>
              <name>hadoop-yarn</name>
            </package>
            <package>
              <name>hadoop-mapreduce</name>
            </package>
          </packages>
        </osSpecific>
      </osSpecifics>

      <configuration-dependencies>
        <config-type>yarn-site</config-type>
        <config-type>capacity-scheduler</config-type>
        <config-type>core-site</config-type>
        <config-type>global</config-type>
        <config-type>yarn-log4j</config-type>
      </configuration-dependencies>
    </service>

  </services>
</metainfo>