@Override
  public String getDescription() {
    return String.format("Scale Cluster '%s' (+%s hosts)", clusterName, getTotalRequestedHostCount());
  }
Constructor.

@param propertySet  set of request properties

@throws InvalidTopologyTemplateException if any validation of properties fails
ambari-server/src/main/java/org/apache/ambari/server/controller/internal/ScaleClusterRequest.java