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public interface HiveShim extends Serializable {
    
   /**
	 * Create a Hive Metastore client based on the given HiveConf object.
	 *
	 * @param hiveConf HiveConf instance
	 * @return an IMetaStoreClient instance
	 */
   IMetaStoreClient getHiveMetastoreClient(HiveConf hiveConf);

   	/**
	 * Alters a Hive table.
	 *
	 * @param client       the Hive metastore client
	 * @param databaseName the name of the database to which the table belongs
	 * @param tableName    the name of the table to be altered
	 * @param table        the new Hive table
	 */	
    
   void alterTable(IMetaStoreClient client, String databaseName, String tableName, Table table)
			throws InvalidOperationException, MetaException, TException;   

   void alterPartition(IMetaStoreClient client, String databaseName, String tableName, Partition partition)
			throws InvalidOperationException, MetaException, TException;
   ...
   ...
   ...
}

HiveShim hiveShim = HiveShimLoader.loadHiveShim(hiveVersion);

IMetaStoreClient createMetastoreClient() {
    return hiveShim.getHiveMetastoreClient(hiveConf);
}

IMetaStoreClient client = createMetastoreClient();