/*
* 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.ignite.internal.processors.hadoop.impl.examples;
import java.io.IOException;
import java.util.Iterator;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.MapReduceBase;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reducer;
import org.apache.hadoop.mapred.Reporter;
import org.apache.ignite.internal.processors.hadoop.impl.HadoopErrorSimulator;
/**
* Combiner and Reducer phase of WordCount job.
*/
public class HadoopWordCount1Reduce extends MapReduceBase implements Reducer<Text, IntWritable, Text, IntWritable> {
/** Flag is to check that mapper was configured before run. */
private boolean wasConfigured;
/** {@inheritDoc} */
@Override public void reduce(Text key, Iterator<IntWritable> values, OutputCollector<Text, IntWritable> output, Reporter reporter)
throws IOException {
assert wasConfigured : "Reducer should be configured";
int sum = 0;
while (values.hasNext())
sum += values.next().get();
output.collect(key, new IntWritable(sum));
HadoopErrorSimulator.instance().onReduce();
}
/** {@inheritDoc} */
@Override public void configure(JobConf job) {
super.configure(job);
wasConfigured = true;
HadoopErrorSimulator.instance().onReduceConfigure();
}
}