com.marklogic.mapreduce.ValueInputFormat Maven / Gradle / Ivy
/*
* Copyright (c) 2020 MarkLogic Corporation
*
* Licensed 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 com.marklogic.mapreduce;
import java.io.IOException;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
/**
* MarkLogicInputFormat for a value other than document or node with
* user specified key and connector-generated key.
*
*
* Use this class to get input data from a MarkLogic database and produce
* key-value pairs with value types such as {@link org.apache.hadoop.io.Text}
* and {@link org.apache.hadoop.io.IntWritable} through implicit conversions
* performed by the connector. For details on the supported conversions, see
* "Using KeyValueInputFormat and ValueInputFormat" in the
* Hadoop MapReduce Connector Developer's Guide.
*
*
* The LongWritable key created with this class is not intended to be a
* meaningful value. Use this class when only the content in the value
* is interesting. The key is simply the number of values seen at the
* time a key-value pair is generated.
*
*
* @see com.marklogic.mapreduce.examples.LinkCount
*
* @author jchen
*
* @param
*/
public class ValueInputFormat
extends MarkLogicInputFormat
implements MarkLogicConstants {
@Override
public RecordReader createRecordReader(
InputSplit split, TaskAttemptContext context)
throws IOException, InterruptedException {
return new ValueReader<>(context.getConfiguration());
}
}