1 | package ro.pub.cs.pp.pdad; |
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2 | |
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3 | import java.io.IOException; |
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4 | |
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5 | import org.apache.hadoop.fs.Path; |
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6 | import org.apache.hadoop.conf.Configuration; |
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7 | import org.apache.hadoop.io.Text; |
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8 | import org.apache.hadoop.io.IntWritable; |
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9 | import org.apache.hadoop.mapreduce.Job; |
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10 | import org.apache.hadoop.mapreduce.Mapper; |
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11 | import org.apache.hadoop.mapreduce.Reducer; |
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12 | import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; |
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13 | import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat; |
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14 | |
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15 | public class ComponentType { |
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16 | |
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17 | public static class Map extends Mapper<Object, Text, IntWritable, IntWritable> { |
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18 | |
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19 | private final static IntWritable one = new IntWritable(1); |
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20 | private final static IntWritable zero = new IntWritable(0); |
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21 | |
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22 | private int extractComponentType(String line) { |
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23 | String[] pieces = line.split("\\s+"); |
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24 | return Integer.parseInt(pieces[6]); |
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25 | } |
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26 | |
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27 | public void map(Object key, Text value, Context context) throws IOException, InterruptedException { |
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28 | String line = value.toString(); |
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29 | try { |
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30 | int componentType = extractComponentType(line); |
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31 | context.write(new IntWritable(componentType), one); |
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32 | } catch (NumberFormatException ex) { |
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33 | context.write(zero, zero); |
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34 | } |
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35 | |
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36 | } |
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37 | } |
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38 | |
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39 | public static class Reduce extends Reducer <IntWritable, IntWritable, Text, IntWritable> { |
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40 | |
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41 | public static String[] compTypeMap = {"host", "CPU", "IO", "network", "memory", "software"}; |
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42 | private Text compType = new Text(); |
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43 | |
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44 | public void reduce(IntWritable key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException { |
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45 | int sum = 0; |
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46 | for (IntWritable cnt : values) { |
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47 | sum += cnt.get(); |
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48 | } |
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49 | compType.set(compTypeMap[key.get()]); |
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50 | context.write(compType, new IntWritable(sum)); |
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51 | } |
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52 | } |
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53 | |
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54 | public static void main(String[] args) throws Exception { |
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55 | Configuration conf = new Configuration(); |
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56 | Job job = new Job(conf, "ComponentType"); |
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57 | job.setNumReduceTasks(5); |
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58 | job.setJarByClass(ComponentType.class); |
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59 | job.setOutputKeyClass(IntWritable.class); |
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60 | job.setOutputValueClass(IntWritable.class); |
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61 | job.setMapperClass(Map.class); |
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62 | /* don't set any combiner class */ |
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63 | job.setReducerClass(Reduce.class); |
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64 | FileInputFormat.addInputPath(job, new Path(args[0])); |
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65 | FileOutputFormat.setOutputPath(job, new Path(args[1])); |
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66 | System.exit(job.waitForCompletion(true) ? 0 : 1); |
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67 | } |
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68 | |
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69 | } |
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