Changes between Initial Version and Version 1 of NCHCCloudCourse100928_4_EXM_c1

Timestamp:

Aug 2, 2011, 2:10:24 PM (14 years ago)

Author:

waue

Comment:

--

NCHCCloudCourse100928_4_EXM_c1

@@ +1 @@
+{{{
+#!java
+
+package org.nchc.hadoop;
+
+import java.io.IOException;
+import java.util.StringTokenizer;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.filecache.DistributedCache;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.io.IntWritable;
+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.Mapper.Context;
+import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
+import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
+import org.apache.hadoop.util.GenericOptionsParser;
+import org.apache.hadoop.util.StringUtils;
+
+public class WordCountV {
+
+        public static class TokenizerMapper extends
+                        Mapper<Object, Text, Text, IntWritable> {
+
+                private final static IntWritable one = new IntWritable(1);
+                private Text word = new Text();
+
+                
+                public void setup(Context context) {
+                        Configuration conf = context.getConfiguration();
+                        System.err.println(conf.get("mapred.job.tracker"));
+
+                }
+                
+                public void map(Object key, Text value, Context context)
+                                throws IOException, InterruptedException {
+                        StringTokenizer itr = new StringTokenizer(value.toString());
+                        while (itr.hasMoreTokens()) {
+                                word.set(itr.nextToken());
+                                context.write(word, one);
+                        }
+                }
+        }
+
+        public static class IntSumReducer extends
+                        Reducer<Text, IntWritable, Text, IntWritable> {
+                private IntWritable result = new IntWritable();
+
+                public void reduce(Text key, Iterable<IntWritable> values,
+                                Context context) throws IOException, InterruptedException {
+                        int sum = 0;
+                        for (IntWritable val : values) {
+                                sum += val.get();
+                        }
+                        result.set(sum);
+                        context.write(key, result);
+                }
+        }
+
+        public static void main(String[] args) throws Exception {
+                String[] argv = { "/home/nchc/input", "/home/nchc/output-wc3" };
+                args =  argv;
+                Configuration conf = new Configuration();
+                conf.set("mapred.job.tracker", "local"); // for single
+                conf.set("fs.default.name", "file:///"); // for single
+
+                String[] otherArgs = new GenericOptionsParser(conf, args)
+                                .getRemainingArgs();
+                if (otherArgs.length != 2) {
+                        System.err
+                                        .println("Usage: hadoop jar WordCount.jar <input> <output>");
+                        System.exit(2);
+                }
+                CheckAndDelete.checkAndDelete(args[1], conf);
+                Job job = new Job(conf, "Word Count");
+                job.setJarByClass(WordCountV.class);
+                job.setMapperClass(TokenizerMapper.class);
+                job.setCombinerClass(IntSumReducer.class);
+                job.setReducerClass(IntSumReducer.class);
+                job.setOutputKeyClass(Text.class);
+                job.setOutputValueClass(IntWritable.class);
+                FileInputFormat.addInputPath(job, new Path(args[0]));
+                FileOutputFormat.setOutputPath(job, new Path(args[1]));
+                
+                System.exit(job.waitForCompletion(true) ? 0 : 1);
+        }
+}
+
+}}}