hadoop DBSplitter 源码
haddop DBSplitter 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/db/DBSplitter.java
/**
* 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;
}
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