/**
* Copyright 2011 Nube Technologies
*
* 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 co.nubetech.hiho.merge;
import java.io.IOException;
import java.util.Iterator;
import org.apache.hadoop.mapreduce.Reducer;
import co.nubetech.hiho.dedup.HihoTuple;
public class MergeValueReducer<K, V> extends
Reducer<HihoTuple, HihoValue, K, V> {
@Override
public void reduce(HihoTuple hihoTuple, Iterable<HihoValue> hihoValues,
Context context) throws IOException, InterruptedException {
context.getCounter(MergeRecordCounter.OUTPUT).increment(1l);
V val = (V) hihoTuple.getKey();
Iterator<HihoValue> iterator = hihoValues.iterator();
if (hihoValues == null || hihoValues.equals(null)
|| !iterator.hasNext()) {
context.write(null, val);
} else {
K key = null;
HihoValue hihoValue = null;
while (iterator.hasNext()) {
hihoValue = iterator.next();
if (!hihoValue.getIsOld()) {
key = (K) hihoValue.getVal();
}
}
if (key == null) {
key = (K) hihoValue.getVal();
}
context.write(key, val);
}
}
}