/* 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 com.alimama.quanjingmonitor.kmeans;
import java.io.IOException;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Reducer;
public class KMeansCombiner extends Reducer<Text, Vector, Text, Vector> {
@Override
protected void reduce(Text key, Iterable<Vector> values, Context context)
throws IOException, InterruptedException {
Vector cluster = new Vector();
Vector cluster_default = new Vector();
boolean isset=false;
boolean ismerger=false;
for (Vector value : values) {
if(value.getNumPoints()>0)
{
cluster.merger(value);
ismerger=true;
}else{
cluster_default.merger(value);
isset=true;
}
}
if(!ismerger&&isset)
{
context.write(key, cluster_default);
}else{
context.write(key, cluster);
}
}
}