@Override
  public String toString() {
    return "{ upgradeCatalog: sourceVersion = " + getSourceVersion() + ", " +
      "targetVersion = " + getTargetVersion() + " }";
  }
Performs normal data upgrade
@throws AmbariException
@throws SQLException
ambari-server/src/main/java/org/apache/ambari/server/upgrade/AbstractUpgradeCatalog.java