/**
* 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.mahout.classifier.bayes.mapreduce.common;
import org.apache.hadoop.conf.Configurable;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.DoubleWritable;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.KeyValueTextInputFormat;
import org.apache.mahout.classifier.bayes.BayesParameters;
import org.apache.mahout.common.HadoopUtil;
import org.apache.mahout.common.StringTuple;
import java.io.IOException;
/**
* Create and run the Bayes Feature Reader Step.
*/
public class BayesFeatureDriver implements BayesJob {
@Override
public void runJob(Path input, Path output, BayesParameters params) throws IOException {
Configurable client = new JobClient();
JobConf conf = new JobConf(BayesFeatureDriver.class);
conf.setJobName("Bayes Feature Driver running over input: " + input);
conf.setOutputKeyClass(StringTuple.class);
conf.setOutputValueClass(DoubleWritable.class);
conf.setPartitionerClass(FeaturePartitioner.class);
conf.setOutputKeyComparatorClass(FeatureLabelComparator.class);
FileInputFormat.setInputPaths(conf, input);
FileOutputFormat.setOutputPath(conf, output);
conf.setMapperClass(BayesFeatureMapper.class);
conf.setInputFormat(KeyValueTextInputFormat.class);
conf.setCombinerClass(BayesFeatureCombiner.class);
conf.setReducerClass(BayesFeatureReducer.class);
conf.setOutputFormat(BayesFeatureOutputFormat.class);
conf.set("io.serializations",
"org.apache.hadoop.io.serializer.JavaSerialization,org.apache.hadoop.io.serializer.WritableSerialization");
// this conf parameter needs to be set enable serialisation of conf values
HadoopUtil.delete(conf, output);
conf.set("bayes.parameters", params.toString());
client.setConf(conf);
JobClient.runJob(conf);
}
}