content: /* 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);
      }
    }
  
  }
  