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From Mahesh Balija <balijamahesh....@gmail.com>
Subject Re: Trouble with Word Count example
Date Thu, 29 Nov 2012 15:46:10 GMT
Hi Sandeep,

           For me everything seems to be alright.
           Can you tell us how are you running this job?

Best,
Mahesh.B.
Calsoft Labs.

On Thu, Nov 29, 2012 at 9:01 PM, Sandeep Jangra <sandeepjangra@gmail.com>wrote:

> Hello everyone,
>
>   Like most others I am also running into some problems while running my
> word count example.
>   I tried the various suggestion available on internet, but I guess it;s
> time to go on email :)
>
>   Here is the error that I am getting:
>   12/11/29 10:20:59 WARN mapred.JobClient: Use GenericOptionsParser for
> parsing the arguments. Applications should implement Tool for the same.
> 12/11/29 10:20:59 WARN mapred.JobClient: No job jar file set.  User
> classes may not be found. See JobConf(Class) or JobConf#setJar(String).
> 12/11/29 10:20:59 INFO input.FileInputFormat: Total input paths to process
> : 1
> 12/11/29 10:20:59 INFO util.NativeCodeLoader: Loaded the native-hadoop
> library
> 12/11/29 10:20:59 WARN snappy.LoadSnappy: Snappy native library is
> available
> 12/11/29 10:20:59 INFO snappy.LoadSnappy: Snappy native library loaded
> 12/11/29 10:21:00 INFO mapred.JobClient: Running job: job_201210310210_0040
> 12/11/29 10:21:01 INFO mapred.JobClient:  map 0% reduce 0%
> 12/11/29 10:21:07 INFO mapred.JobClient: Task Id :
> attempt_201210310210_0040_m_000000_0, Status : FAILED
> java.lang.RuntimeException: *java.lang.ClassNotFoundException: Class
> WordCount2$Map *not found
> at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1439)
> at
> org.apache.hadoop.mapreduce.task.JobContextImpl.getMapperClass(JobContextImpl.java:191)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:605)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:325)
> at org.apache.hadoop.mapred.Child$4.run(Child.java:270)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:416)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1232)
> at org.apache.hadoop.mapred.Child.main(Child.java:264)
> Caused by: java.lang.ClassNotFoundException: Class WordCount2$Map not found
> at
> org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:1350)
> at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1437)
> ... 8 more
>
> And here is the source code:
>
>
> import org.apache.hadoop.conf.Configuration;
> import org.apache.hadoop.conf.Configured;
> import org.apache.hadoop.fs.Path;
> import org.apache.hadoop.io.IntWritable;
> import org.apache.hadoop.io.LongWritable;
> 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.Tool;
> import org.apache.hadoop.util.ToolRunner;
>
> import java.io.IOException;
> import java.util.StringTokenizer;
>
> public class WordCount2 extends Configured implements Tool {
>
>
>     public static class Map extends Mapper<LongWritable, Text, Text,
> IntWritable> {
>         private final static IntWritable one = new IntWritable(1);
>         private Text word = new Text();
>
>         @Override
>         protected void map(LongWritable key, Text value, Context context)
> throws IOException, InterruptedException {
>             String line = value.toString();
>             StringTokenizer tokenizer = new StringTokenizer(line);
>             while (tokenizer.hasMoreTokens()) {
>                 word.set(tokenizer.nextToken());
>                 context.write(word, one);
>             }
>         }
>
>     }
>
>
>     public static class Reduce extends Reducer<Text, IntWritable, Text,
> IntWritable> {
>
>         @Override
>         protected void reduce(Text key, Iterable<IntWritable> values,
> Context context) throws IOException, InterruptedException {
>
>             int sum = 0;
>
>             for(IntWritable value : values) {
>                 sum += value.get();
>             }
> //                    while (values.hasNext()) {
> //                          sum += values.next().get();
> //                        }
>             context.write(key, new IntWritable(sum));
>         }
>
>     }
>
>     @Override
>     public int run(String[] args) throws Exception {
>         Configuration conf = getConf();
>         for (java.util.Map.Entry<String, String> entry: conf) {
>             System.out.printf("%s=%s\n", entry.getKey(), entry.getValue());
>         }
>
>         System.out.println("arg[0]= "+args[0] + " args[1]= "+ args[1]);
>
>         Job job = new Job(conf, WordCount2.class.getSimpleName());
>         job.setJobName("wordcount2");
>         job.setJarByClass(WordCount2.class);
>
>         job.setMapOutputKeyClass(Text.class);
>         job.setMapOutputValueClass(IntWritable.class);
>
>         job.setOutputKeyClass(Text.class);
>         job.setOutputValueClass(IntWritable.class);
>
>         job.setMapperClass(Map.class);
>         job.setCombinerClass(Reduce.class);
>         job.setReducerClass(Reduce.class);
>
>         job.setInputFormatClass(TextInputFormat.class);
>         job.setOutputFormatClass(TextOutputFormat.class);
>
>         FileInputFormat.setInputPaths(job, new Path(args[0]));
>         FileOutputFormat.setOutputPath(job, new Path(args[1]));
>
>         System.exit(job.waitForCompletion(true) ? 0 : 1);
>
>         return 0;
>     }
>
>
>
>     public static void main(String[] args) throws Exception {
>         int exitCode = ToolRunner.run(new WordCount2(), args);
>         System.exit(exitCode);
>     }
> }
>
>
>

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