static String[] parseNameNodes(String nameService, Map<String, String> properties) {
    final String nameNodes = properties.get("dfs.ha.namenodes." + nameService);
    return splitAndTrimStrings(nameNodes);
  }
Parses out the list of name nodes associated with a given HDFS
  NameService, based on a given HDFS configuration.

@param nameService the nameservice used for this parsing
@param properties config properties for this cluster

@return array of Strings that indicate the name nodes associated
          with this nameservice
ambari-server/src/main/java/org/apache/ambari/server/controller/internal/BlueprintConfigurationProcessor.java