| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.hadoop.mapreduce.lib.db; |
| |
| import java.sql.ResultSet; |
| import java.sql.SQLException; |
| import java.util.List; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.mapreduce.InputSplit; |
| |
| /** |
| * DBSplitter will generate DBInputSplits to use with DataDrivenDBInputFormat. |
| * DataDrivenDBInputFormat needs to interpolate between two values that |
| * represent the lowest and highest valued records to import. Depending |
| * on the data-type of the column, this requires different behavior. |
| * DBSplitter implementations should perform this for a data type or family |
| * of data types. |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public interface DBSplitter { |
| /** |
| * Given a ResultSet containing one record (and already advanced to that record) |
| * with two columns (a low value, and a high value, both of the same type), determine |
| * a set of splits that span the given values. |
| */ |
| List<InputSplit> split(Configuration conf, ResultSet results, String colName) throws SQLException; |
| } |
