Hi
I think attachment will not got thgrough the common-user@hadoop.apache.org.
Ok Please have a look bellow.
MAP
------------------------
package test;
import java.io.IOException;
import org.apache.hadoop.io.FloatWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.MapReduceBase;
import org.apache.hadoop.mapred.Mapper;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reporter;
public class myMapper extends MapReduceBase implements
Mapper<LongWritable,Text,FloatWritable,Text> {
public void map(LongWritable offset, Text
val,OutputCollector<FloatWritable,Text> output, Reporter reporter) throws
IOException {
output.collect(new FloatWritable(1), val);
}
}
REDUCER
------------------------------
Prepare reducer what exactly you want for.
JOB
------------------------
package test;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.filecache.DistributedCache;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.FloatWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.SequenceFileOutputFormat;
import org.apache.hadoop.mapred.TextInputFormat;
import org.apache.hadoop.mapred.TextOutputFormat;
import org.apache.hadoop.util.GenericOptionsParser;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
public class TestDemo extends Configured implements Tool{
public static void main(String args[]) throws Exception{
int res = ToolRunner.run(new Configuration(), new
TestDemo(),args);
System.exit(res);
}
@Override
public int run(String[] args) throws Exception {
JobConf conf = new JobConf(TestDemo.class);
String[] otherArgs = new GenericOptionsParser(conf,
args).getRemainingArgs();
conf.setJobName("TestCustomInputOutput");
conf.setMapperClass(myMapper.class);
conf.setMapOutputKeyClass(FloatWritable.class);
conf.setMapOutputValueClass(Text.class);
conf.setNumReduceTasks(0);
conf.setOutputKeyClass(FloatWritable.class);
conf.setOutputValueClass(Text.class);
conf.setInputFormat(TextInputFormat.class);
conf.setOutputFormat(SequenceFileOutputFormat.class);
TextInputFormat.addInputPath(conf, new Path(args[0]));
SequenceFileOutputFormat.setOutputPath(conf, new Path(args[1]));
JobClient.runJob(conf);
return 0;
}
}
On Wed, May 30, 2012 at 6:57 PM, samir das mohapatra <
samir.help...@gmail.com> wrote:
> PFA.
>
>
> On Wed, May 30, 2012 at 2:45 AM, Mark question <markq2...@gmail.com>wrote:
>
>> Hi Samir, can you email me your main class.. or if you can check mine, it
>> is as follows:
>>
>> public class SortByNorm1 extends Configured implements Tool {
>>
>> @Override public int run(String[] args) throws Exception {
>>
>> if (args.length != 2) {
>> System.err.printf("Usage:bin/hadoop jar norm1.jar <inputDir>
>> <outputDir>\n");
>> ToolRunner.printGenericCommandUsage(System.err);
>> return -1;
>> }
>> JobConf conf = new JobConf(new Configuration(),SortByNorm1.class);
>> conf.setJobName("SortDocByNorm1");
>> conf.setMapperClass(Norm1Mapper.class);
>> conf.setMapOutputKeyClass(FloatWritable.class);
>> conf.setMapOutputValueClass(Text.class);
>> conf.setNumReduceTasks(0);
>> conf.setReducerClass(Norm1Reducer.class);
>> conf.setOutputKeyClass(FloatWritable.class);
>> conf.setOutputValueClass(Text.class);
>>
>> conf.setInputFormat(TextInputFormat.class);
>> conf.setOutputFormat(SequenceFileOutputFormat.class);
>>
>> TextInputFormat.addInputPath(conf, new Path(args[0]));
>> SequenceFileOutputFormat.setOutputPath(conf, new Path(args[1]));
>> JobClient.runJob(conf);
>> return 0;
>> }
>> public static void main(String[] args) throws Exception {
>> int exitCode = ToolRunner.run(new SortByNorm1(), args);
>> System.exit(exitCode);
>> }
>>
>>
>> On Tue, May 29, 2012 at 1:55 PM, samir das mohapatra <
>> samir.help...@gmail.com> wrote:
>>
>> > Hi Mark
>> > See the out put for that same Application .
>> > I am not getting any error.
>> >
>> >
>> > On Wed, May 30, 2012 at 1:27 AM, Mark question <markq2...@gmail.com
>> >wrote:
>> >
>> >> Hi guys, this is a very simple program, trying to use TextInputFormat
>> and
>> >> SequenceFileoutputFormat. Should be easy but I get the same error.
>> >>
>> >> Here is my configurations:
>> >>
>> >> conf.setMapperClass(myMapper.class);
>> >> conf.setMapOutputKeyClass(FloatWritable.class);
>> >> conf.setMapOutputValueClass(Text.class);
>> >> conf.setNumReduceTasks(0);
>> >> conf.setOutputKeyClass(FloatWritable.class);
>> >> conf.setOutputValueClass(Text.class);
>> >>
>> >> conf.setInputFormat(TextInputFormat.class);
>> >> conf.setOutputFormat(SequenceFileOutputFormat.class);
>> >>
>> >> TextInputFormat.addInputPath(conf, new Path(args[0]));
>> >> SequenceFileOutputFormat.setOutputPath(conf, new Path(args[1]));
>> >>
>> >>
>> >> myMapper class is:
>> >>
>> >> public class myMapper extends MapReduceBase implements
>> >> Mapper<LongWritable,Text,FloatWritable,Text> {
>> >>
>> >> public void map(LongWritable offset, Text
>> >> val,OutputCollector<FloatWritable,Text> output, Reporter reporter)
>> >> throws IOException {
>> >> output.collect(new FloatWritable(1), val);
>> >> }
>> >> }
>> >>
>> >> But I get the following error:
>> >>
>> >> 12/05/29 12:54:31 INFO mapreduce.Job: Task Id :
>> >> attempt_201205260045_0032_m_000000_0, Status : FAILED
>> >> java.io.IOException: wrong key class:
>> org.apache.hadoop.io.LongWritable is
>> >> not class org.apache.hadoop.io.FloatWritable
>> >> at
>> >> org.apache.hadoop.io.SequenceFile$Writer.append(SequenceFile.java:998)
>> >> at
>> >>
>> >>
>> org.apache.hadoop.mapred.SequenceFileOutputFormat$1.write(SequenceFileOutputFormat.java:75)
>> >> at
>> >>
>> >>
>> org.apache.hadoop.mapred.MapTask$DirectMapOutputCollector.collect(MapTask.java:705)
>> >> at
>> >>
>> >>
>> org.apache.hadoop.mapred.MapTask$OldOutputCollector.collect(MapTask.java:508)
>> >> at
>> >>
>> >>
>> filter.stat.cosine.preprocess.SortByNorm1$Norm1Mapper.map(SortByNorm1.java:59)
>> >> at
>> >>
>> >>
>> filter.stat.cosine.preprocess.SortByNorm1$Norm1Mapper.map(SortByNorm1.java:1)
>> >> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:54)
>> >> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:397)
>> >> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:330)
>> >> at org.apache.hadoop.mapred.Child$4.run(Child.java:217)
>> >> at java.security.AccessController.doPrivileged(Native Method)
>> >> at javax.security.auth.Subject.doAs(Subject.java:396)
>> >> at org.apache.hadoop.security.Use
>> >>
>> >> Where is the writing of LongWritable coming from ??
>> >>
>> >> Thank you,
>> >> Mark
>> >>
>> >
>> >
>>
>
>
