private void modifyPropertyValueColumnInAmbariConfigurationTable() throws SQLException {
    dbAccessor.alterColumn(AMBARI_CONFIGURATION_TABLE, new DBAccessor.DBColumnInfo(AMBARI_CONFIGURATION_PROPERTY_VALUE_COLUMN, String.class, 4000, null, false));
    LOG.info("Altered {}.{} to NOT NULL and extended its length to 4000", AMBARI_CONFIGURATION_TABLE, AMBARI_CONFIGURATION_PROPERTY_VALUE_COLUMN);
  }
The {@link UpgradeCatalog280} upgrades Ambari from 2.7.2 to 2.8.0.
ambari-server/src/main/java/org/apache/ambari/server/upgrade/UpgradeCatalog280.java