com.veera.secondarysort.demo2.SsReducer.java Source code

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Here is the source code for com.veera.secondarysort.demo2.SsReducer.java

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/**
 * Copyright 2012 Jee Vang 
 * 
 * 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.veera.secondarysort.demo2;

import java.io.IOException;
import java.util.Iterator;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.io.DoubleWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Reducer;

/**
 * Secondary sort reducer.
 * @author Jee Vang
 *
 */
public class SsReducer extends Reducer<StockKey, DoubleWritable, Text, Text> {

    private static final Log _log = LogFactory.getLog(SsReducer.class);

    @Override
    public void reduce(StockKey key, Iterable<DoubleWritable> values, Context context)
            throws IOException, InterruptedException {
        Text k = new Text(key.toString());
        int count = 0;

        Iterator<DoubleWritable> it = values.iterator();
        while (it.hasNext()) {
            Text v = new Text(it.next().toString());
            context.write(k, v);
            _log.debug(k.toString() + " => " + v.toString());
            count++;
        }

        _log.debug("count = " + count);
    }
}