/*
* Sifarish: Recommendation Engine
* Author: Pranab Ghosh
*
* 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 org.sifarish.common;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.FileSplit;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.chombo.util.SecondarySort;
import org.chombo.util.Tuple;
import org.chombo.util.Utility;
/**
* Injects business goal into rated items and figures out final net rating. The basic idea is to
* find a middle ground between consumer interest and business interest
* @author pranab
*
*/
public class BusinessGoalInjector extends Configured implements Tool{
@Override
public int run(String[] args) throws Exception {
Job job = new Job(getConf());
String jobName = "Business goal injector MR";
job.setJobName(jobName);
job.setJarByClass(BusinessGoalInjector.class);
FileInputFormat.addInputPath(job, new Path(args[0]));
FileOutputFormat.setOutputPath(job, new Path(args[1]));
job.setMapperClass(BusinessGoalInjector.BusinessGoalMapper.class);
job.setReducerClass(BusinessGoalInjector.BusinessGoalReducer.class);
job.setMapOutputKeyClass(Tuple.class);
job.setMapOutputValueClass(Tuple.class);
job.setOutputKeyClass(NullWritable.class);
job.setOutputValueClass(Text.class);
job.setGroupingComparatorClass(SecondarySort.TuplePairGroupComprator.class);
job.setPartitionerClass(SecondarySort.TuplePairPartitioner.class);
Utility.setConfiguration(job.getConfiguration());
int numReducer = job.getConfiguration().getInt("bgi.num.reducer", -1);
numReducer = -1 == numReducer ? job.getConfiguration().getInt("num.reducer", 1) : numReducer;
job.setNumReduceTasks(numReducer);
int status = job.waitForCompletion(true) ? 0 : 1;
return status;
}
/**
* @author pranab
*
*/
public static class BusinessGoalMapper extends Mapper<LongWritable, Text, Tuple, Tuple> {
private String fieldDelim;
private Tuple keyOut = new Tuple();
private Tuple valOut = new Tuple();
private boolean isBizGoalFileSplit;
/* (non-Javadoc)
* @see org.apache.hadoop.mapreduce.Mapper#setup(org.apache.hadoop.mapreduce.Mapper.Context)
*/
protected void setup(Context context) throws IOException, InterruptedException {
fieldDelim = context.getConfiguration().get("field.delim", ",");
String bizGoalFilePrefix = context.getConfiguration().get("bgi.biz.goal.file.prefix", "biz");
isBizGoalFileSplit = ((FileSplit)context.getInputSplit()).getPath().getName().startsWith(bizGoalFilePrefix);
}
/* (non-Javadoc)
* @see org.apache.hadoop.mapreduce.Mapper#map(KEYIN, VALUEIN, org.apache.hadoop.mapreduce.Mapper.Context)
*/
@Override
protected void map(LongWritable key, Text value, Context context)
throws IOException, InterruptedException {
String[] items = value.toString().split(fieldDelim);
keyOut.initialize();
valOut.initialize();
if (isBizGoalFileSplit) {
//item ID
keyOut.add(items[0], 0);
//business goal scores
for (int i = 1; i < items.length; ++i) {
valOut.add(Integer.parseInt(items[i]));
}
} else {
//item ID
keyOut.add(items[1], 1);
//userID, score
valOut.add(items[0], Integer.parseInt(items[2]));
}
context.write(keyOut, valOut);
}
}
/**
* @author pranab
*
*/
public static class BusinessGoalReducer extends Reducer<Tuple, Tuple, NullWritable, Text> {
private String fieldDelim;
private Text valOut = new Text();
private int[] bizGoalWeights;
private int[] bizGoalThreshold;
private int recWt;
private int maxBizGoalWeight;
private final int MAX_WEIGHT = 100;
/* (non-Javadoc)
* @see org.apache.hadoop.mapreduce.Reducer#setup(org.apache.hadoop.mapreduce.Reducer.Context)
*/
protected void setup(Context context) throws IOException, InterruptedException {
Configuration config = context.getConfiguration();
fieldDelim = config.get("field.delim", ",");
bizGoalWeights = Utility.intArrayFromString(config.get("bgi.biz.goal.weights"),fieldDelim );
maxBizGoalWeight = config.getInt("bgi.max.biz.goal.weight", 70);
int sumWt = 0;
for (int wt : bizGoalWeights) {
sumWt += wt;
}
if (sumWt > maxBizGoalWeight) {
throw new IllegalArgumentException("Sum of business score weights exceed limit");
}
recWt = MAX_WEIGHT - sumWt;
bizGoalThreshold = Utility.intArrayFromString(config.get("bgi.biz.goal.min.threshold"),fieldDelim );
}
/* (non-Javadoc)
* @see org.apache.hadoop.mapreduce.Reducer#reduce(KEYIN, java.lang.Iterable, org.apache.hadoop.mapreduce.Reducer.Context)
*/
protected void reduce(Tuple key, Iterable<Tuple> values, Context context)
throws IOException, InterruptedException {
boolean first = true;
Tuple bizScore = null;
boolean toSkip = false;
for(Tuple value : values) {
toSkip = false;
if (first) {
if (value.isInt(0)) {
//business score available for this item
bizScore = value.createClone();
} else {
//just emit rating
valOut.set(value.getString(0) + fieldDelim + key.getString(0) + fieldDelim + value.getInt(1));
context.write(NullWritable.get(), valOut);
}
first = false;
} else {
int weightedScore = 0;
if (null != bizScore) {
//weighted average score
int sumWeightedScore = recWt * value.getInt(1);
int numBizGoal = bizScore.getSize();
for (int i = 0; i < numBizGoal; ++i) {
int score = bizScore.getInt(i);
if (bizGoalThreshold[i] >= 0 && score <= bizGoalThreshold[i] ) {
toSkip = true;
break;
}
sumWeightedScore += bizGoalWeights[i] * score;
}
weightedScore = sumWeightedScore / MAX_WEIGHT;
} else {
//just score
weightedScore = value.getInt(1);
}
if (!toSkip) {
valOut.set(value.getString(0) + fieldDelim + key.getString(0) + fieldDelim + weightedScore);
context.write(NullWritable.get(), valOut);
}
}
}
}
}
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
int exitCode = ToolRunner.run(new BusinessGoalInjector(), args);
System.exit(exitCode);
}
}