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<topology>
  <gateway>
    ...
    <provider>
       <role>ha</role>
       <name>HAProvider</name>
       <param>
           <name>webhdfs.ha</name>
           <value>failover_strategy=BaseStrategy;retryCount=3;timeoutInterval=5000;enabled=true</value>
       </param>
       <param>
           <name>namenode.ha</name>
           <value>failover_strategy=BaseStrategy;retryCount=3;timeoutInterval=5000;enabled=true</value>
       </param>
    </provider>
    ...
  <gateway>
  ...
  <service>
     <role>WEBHDFS</role>
     <url>machine1.example.com:50070</url>
     <url>machine2.example.com:50070</url>
  </service>
  ...
  <service>
     <role>NAMENODE</role>
     <url>machine1.example.com:50070</url>
     <url>machine2.example.com:50070</url>
  </service>
...
</topology>