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MinMaxCountsHadoop.java
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MinMaxCountsHadoop.java
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import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
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.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
import org.apache.hadoop.util.bloom.*;
public class MinMaxCountsHadoop {
public static class MinMaxCountMapper extends Mapper<Object, Text, Text, MinMaxCountsTuple> {
private Text month = new Text();
private MinMaxCountsTuple outTuple = new MinMaxCountsTuple();
public void map(Object key, Text value, Context context)
throws IOException, InterruptedException {
String[] line = value.toString().split(",");
month.set(line[2]);
int delay = Integer.parseInt(line[20]);
outTuple.setCount(1);
outTuple.setMax(delay);
outTuple.setMin(delay);
context.write(month, outTuple);
}
}
public static class MinMaxCountReducer extends
Reducer<Text, MinMaxCountsTuple, Text, MinMaxCountsTuple> {
private MinMaxCountsTuple result = new MinMaxCountsTuple();
public void reduce(Text key, Iterable<MinMaxCountsTuple> values, Context context) throws
IOException, InterruptedException {
result.setMin(Integer.MAX_VALUE);
result.setMax(Integer.MIN_VALUE);
result.setCount(0);
int sum = 0;
for (MinMaxCountsTuple val : values) {
if (val.getMin() < result.getMin()) {
result.setMin(val.getMin());
}
if (val.getMax() > result.getMax()) {
result.setMax(val.getMax());
}
sum += val.getCount();
}
result.setCount(sum);
context.write(key, result);
}
}
public static void main(String[] args) throws Exception {
Configuration conf = new Configuration();
Job job = new Job(conf, "MinMaxCount");
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(MinMaxCountsTuple.class);
job.setMapperClass(MinMaxCountMapper.class);
job.setReducerClass(MinMaxCountReducer.class);
job.setInputFormatClass(TextInputFormat.class);
job.setOutputFormatClass(TextOutputFormat.class);
FileInputFormat.addInputPath(job, new Path(args[0]));
FileOutputFormat.setOutputPath(job, new Path(args[1]));
job.waitForCompletion(true);
}
}