Hadoop mapper&reducer debugging + test driver

Package test;
Import org.apache.hadoop.conf.Configured;
Import Org.apache.hadoop.fs.FileSystem;
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.mapred.*;
Import Org.apache.hadoop.util.Tool;
Import Org.apache.hadoop.util.ToolRunner;
Import Org.junit.Assert;

Import Org.junit.Test;
Import java.io.IOException;
Import Java.net.URI;
Import java.util.ArrayList;
Import Java.util.Iterator;

Import java.util.List;
 /** * Created by the IntelliJ idea. * User:tony * DATE:11/20/11 * time:6:35 AM * To change this template use File | Settings |
 File Templates. */public class Temperaturemapreduce extends configured implements Tool {public static class Tempmapper extends Cebase implements Mapper<longwritable, Text, longwritable, text> {public void map (longwritable longwritable, Text text, outputcollector<longwritable, text> TextintwritableouTputcollector, Reporter Reporter) throws IOException {System.out.println (longwritable + "---" + text);
        Longwritable year = new Longwritable (long.valueof (text.tostring (). substring (0, 4));
        Text temperature = new text (text.tostring (). SUBSTRING (4, 6));
        Text result = text;
        SYSTEM.OUT.PRINTLN (year + "-+++++++++++++++++++-" + temperature);
    Textintwritableoutputcollector.collect (year, temperature); } public static class Tempreducer extends Mapreducebase implements Reducer<longwritable, Text, longwritable, Text&gt ; {public void reduce (longwritable key, iterator<text> values, outputcollector<longwritable, text> output,
        Reporter Reporter) throws IOException {int sum = 0;
        Text t = null;
        Long maxtemp = 0L;
            while (Values.hasnext ()) {Text tmp = Values.next ();
            System.out.println ("key:" + key + "it:" + tmp); Long temp = long.valueof (tmp.tostRing ());
                if (Temp > maxtemp) {maxtemp = temp;
            t = tmp;
    } output.collect (Key, New Text (maxtemp+ ""));
        @Test public void Testmapper () throws IOException {Tempmapper mymapper = new Tempmapper ();
        Text text = new text ("199951"); Outputcollector outputcollector = new outputcollector<longwritable,text> () {public void collect (Longwrit Able Resultkey, Text resultvalue) throws IOException {System.out.println ("Resultkey:" + Resultkey + "re
                Sultvalue: "+ resultvalue);
                Assert.asserttrue ("1999". Equals (Resultkey.tostring ()));
            Assert.asserttrue ("Wuyi". Equals (Resultvalue.tostring ());
        }
        };

    Mymapper.map (Null,text, outputcollector, NULL);
        @Test public void Testreducer () throws IOException {Tempreducer mymapper = new Tempreducer ();
 Text text = new text ("199951");       Longwritable longwritable = new Longwritable (1999);
        List List = new ArrayList ();
        List.add (New Text ("49"));
        List.add (New Text ("29"));



        List.add (New Text ("59")); Outputcollector outputcollector = new outputcollector<longwritable,text> () {public void collect (Longwrit Able Resultkey, Text resultvalue) throws IOException {System.out.println ("Resultkey:" + Resultkey + "re
                Sultvalue: "+ resultvalue);
                Assert.asserttrue ("1999". Equals (Resultkey.tostring ()));
            Assert.asserttrue ("resultvalue.tostring" () equals ());
        }
        };

    Mymapper.reduce (Longwritable, List.iterator (), outputcollector, NULL);
        public int run (string[] args) throws Exception {jobconf conf = new jobconf (getconf (), getclass ());
        Conf.setjobname ("WordCount");



        Conf.set ("Fs.default.name", "hdfs://192.168.126.133:9000/"); String output = "hdfs://192.168.126.133:9000/t1output ";
        FileSystem fs = Filesystem.get (uri.create (Output), conf);
        Path PATH = new path (output);
        if (fs.exists (path)) {Fs.delete (path, true);

        } fs.close ();
        Conf.setmapperclass (Tempmapper.class);
        Conf.setcombinerclass (Tempreducer.class);

        Conf.setreducerclass (Tempreducer.class);
        /*conf.setmapoutputkeyclass (Longwritable.class);
        Conf.setmapoutputvalueclass (Text.class);
        Conf.setoutputkeyclass (Text.class);
        Conf.setoutputvalueclass (Intwritable.class); * * Conf.setoutputkeyclass (Text.class);
        Conf.setoutputvalueclass (Intwritable.class); * * Conf.setinputformat (Textinputformat.class);
        Conf.setoutputformat (Textoutputformat.class); */fileinputformat.setinputpaths (conf, new Path (args[0));

        Fileoutputformat.setoutputpath (conf, new Path (args[1));
        Jobclient.runjob (conf);
    return 1; } public static VOID Main (string[] args) {try {string[] arg = new string[]{"Hdfs://192.168.126.133:9000/t1/temperature
            . txt "," hdfs://192.168.126.133:9000/t1output "};
        Toolrunner.run (New Temperaturemapreduce (), ARG);
        catch (Exception e) {e.printstacktrace ();
 }

    }


}