Your delcaration of the Map class needs to include the input and
output types, e.g.:
public static class Map extends MapReduceBase implements
Mapper<LongWritable, Text, Text, LongWritable> {
...
}
-Joey
On Mon, Apr 25, 2011 at 4:38 AM, praveenesh kumar <[email protected]> wrote:
> Hi,
>
> I am running the following code (Gender.java) on my hadoop .
>
>
> import java.io.IOException;
> import java.util.*;
>
> import org.apache.hadoop.fs.Path;
> import org.apache.hadoop.conf.*;
> import org.apache.hadoop.io.*;
> import org.apache.hadoop.mapred.*;
> import org.apache.hadoop.util.*;
>
> public class Gender {
>
> private static String genderCheck = "female";
>
> public static class Map extends MapReduceBase implements Mapper {
> private final static IntWritable one = new IntWritable(1);
> private Text locText = new Text();
>
> public void map(LongWritable key, Text value, OutputCollector
> output, Reporter reporter) throws IOException {
> String line = value.toString();
> String location = line.split(",")[14] + "," +
> line.split(",")[15];
> long male = 0L;
> long female = 0L;
> if (line.split(",")[17].matches("\d+") &&
> line.split(",")[18].matches("\d+")) {
> male = Long.parseLong(line.split(",")[17]);
> female = Long.parseLong(line.split(",")[18]);
> }
> long diff = male - female;
> locText.set(location);
> if (Gender.genderCheck.toLowerCase().equals("female") && diff <
> 0) {
> output.collect(locText, new LongWritable(diff * -1L));
> }
> else if (Gender.genderCheck.toLowerCase().equals("male") && diff
>> 0) {
> output.collect(locText, new
> LongWritable(diff));
> }
> }
> }
>
> public static void main(String[] args) throws Exception {
> JobConf conf = new JobConf(Gender.class);
> conf.setJobName("gender");
> conf.setOutputKeyClass(Text.class);
> conf.setOutputValueClass(LongWritable.class);
> conf.setMapperClass(Map.class);
>
> if (args.length != 3) {
> System.out.println("Usage:");
> System.out.println("[male/female] /path/to/2kh/files
> /path/to/output");
> System.exit(1);
> }
>
> if (!args[0].equalsIgnoreCase("male") &&
> !args[0].equalsIgnoreCase("female")) {
> System.out.println("first argument must be male or female");
> System.exit(1);
> }
> Gender.genderCheck = args[0];
>
> conf.setInputFormat(TextInputFormat.class);
> conf.setOutputFormat(TextOutputFormat.class);
> FileInputFormat.setInputPaths(conf, new Path(args[1]));
> FileOutputFormat.setOutputPath(conf, new Path(args[2]));
> JobClient.runJob(conf);
> }
>
> }
>
> I am getting the following exception while compiling this :
>
> *Gender.java:14: Gender.Map is not abstract and does not override abstract
> method
> map(java.lang.Object,java.lang.Object,org.apache.hadoop.mapred.OutputCollector,org.apache.hadoop.mapred.Reporter)
> in org.apache.hadoop.mapred.Mapper
> public static class Map extends MapReduceBase implements Mapper {
> ^
> Note: Gender.java uses or overrides a deprecated API.
> Note: Recompile with -Xlint:deprecation for details.
> Note: Gender.java uses unchecked or unsafe operations.
> Note: Recompile with -Xlint:unchecked for details.
> *
> Anyone suggest me how to debug this error ??
>
--
Joseph Echeverria
Cloudera, Inc.
443.305.9434
