com.talis.mapreduce.dicenc.SecondReducer.java Source code

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Here is the source code for com.talis.mapreduce.dicenc.SecondReducer.java

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/*
 * Copyright  2011 Talis Systems Ltd.
 *
 * 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.talis.mapreduce.dicenc;

import java.io.IOException;

import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.output.MultipleOutputs;

public class SecondReducer extends Reducer<Text, Text, Text, Text> {

    private long counter = 0;
    private MultipleOutputs<Text, NullWritable> mos;

    @Override
    @SuppressWarnings("unchecked")
    public void setup(Context context) {
        mos = new MultipleOutputs(context);

        String mapred_task_id = context.getConfiguration().get("mapred.task.id");
        counter = (Long.valueOf(mapred_task_id.substring(mapred_task_id.indexOf("_r_") + 3).replaceAll("_", ""))
                + 1) << 32;
    }

    @Override
    public void reduce(Text key, Iterable<Text> values, Context context) throws IOException, InterruptedException {
        Text _id = new Text("" + counter++);
        mos.write("dict", _id, key);

        for (Text value : values) {
            context.write(_id, value);
        }

    }

    @Override
    public void cleanup(Context context) throws IOException {
        try {
            mos.close();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

}