jp.co.yahoo.yosegi.hadoop.tools.logsampler.LogSamplerReducer Maven / Gradle / Ivy

Go to download
/**
 * 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 jp.co.yahoo.yosegi.hadoop.tools.logsampler;

import jp.co.yahoo.yosegi.message.parser.IParser;
import jp.co.yahoo.yosegi.message.parser.json.JacksonMessageReader;

import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Reducer;

import java.io.IOException;

public class LogSamplerReducer
    extends Reducer {

  private final JacksonMessageReader reader = new JacksonMessageReader();

  @Override
  public void reduce(
      final LongWritable key ,
      final Iterable values ,
      final Context context ) throws IOException, InterruptedException {
    for ( Text value : values ) {
      context.write(
          NullWritable.get() , reader.create( value.getBytes() , 0 , value.getLength() ) );
    }
  }

}