org.apache.solr.hadoop.IdentityReducer.java Source code

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Here is the source code for org.apache.solr.hadoop.IdentityReducer.java

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/*
 * 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.solr.hadoop;

import java.io.IOException;

import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Reducer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class IdentityReducer extends Reducer<Text, NullWritable, Text, NullWritable> {

    private static final Logger LOGGER = LoggerFactory.getLogger(IdentityReducer.class);

    @Override
    protected void reduce(Text key, Iterable<NullWritable> values, Context context)
            throws IOException, InterruptedException {
        LOGGER.info("reduce key: {}, value: {}", key, values);
        context.write(key, NullWritable.get());
    }
}