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//これら 3 つのプログラムに必要なパッケージは何か??? この 3 つのプログラムを 1 つのプログラムに結合する方法は?? Eclipseでこの3つのプログラムを使用してmapreduceを行うには??

このプログラムを正常に実行するのを手伝ってください

OS:Linux

直面した例外:

  1. メソッド TryParseInt(String) は、タイプ MaxPYear.MaxPubYearReducer に対して未定義です

2.Job 型のメソッド setInputFormatClass (Class) は、引数 (Class) には適用されません。

マッパーコード:

public static class MaxPubYearMapper extends Mapper<LongWritable , Text, IntWritable,Text>
    {
        public void map(LongWritable key, Text value , Context context)

                throws IOException, InterruptedException 
                {
            String delim = "\t";
            Text valtosend = new Text(); 
            String tokens[] = value.toString().split(delim);
            if (tokens.length == 2)
            {
                valtosend.set(tokens[0] + ";"+ tokens[1]);
                context.write(new IntWritable(1), valtosend);
            }

                }       
    }

レデューサーコード:

public static class MaxPubYearReducer extends Reducer<IntWritable ,Text, Text, IntWritable>
    {

        public void reduce(IntWritable key, Iterable<Text> values , Context context) throws IOException, InterruptedException
        {
            int maxiValue = Integer.MIN_VALUE;
            String maxiYear = "";
            for(Text value:values)          {
                String token[] = value.toString().split(";");
                if(token.length == 2 && TryParseInt(token[1]).intValue()> maxiValue)
                {
                    maxiValue = TryParseInt(token[1]);
                    maxiYear = token[0];
                }
            }
            context.write(new Text(maxiYear), new IntWritable(maxiValue));
        }
    }

ドライバーコード:

public static void main(String[] args) throws Exception  {
        Configuration conf = new Configuration(); 
        Job job = new Job(conf , "Frequency`enter code here`");
        job.setJarByClass(MaxPubYear.class);
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(IntWritable.class);

        job.setMapperClass(FrequencyMapper.class);
        job.setCombinerClass(FrequencyReducer.class);
        job.setReducerClass(FrequencyReducer.class);


        job.setOutputFormatClass(TextOutputFormat.class);
        job.setInputFormatClass(TextInputFormat.class);

        FileInputFormat.addInputPath(job,new Path(args[0]));
        FileOutputFormat.setOutputPath(job,new Path(args[1]+ "_temp"));
        int exitCode = job.waitForCompletion(true)?0:1; 

        if (exitCode == 0 )
        {
            Job SecondJob = new Job(conf, "Maximum Publication year");
            SecondJob.setJarByClass(MaxPubYear.class);

            SecondJob.setOutputKeyClass(Text.class);
            SecondJob.setOutputValueClass(IntWritable.class);

            SecondJob.setMapOutputKeyClass(IntWritable.class);
            SecondJob.setMapOutputValueClass(Text.class);

            SecondJob.setMapperClass(MaxPubYearMapper.class);               
            SecondJob.setReducerClass(MaxPubYearReducer.class);

            FileInputFormat.addInputPath(SecondJob,new Path(args[1]+ "_temp"));
            FileOutputFormat.setOutputPath(SecondJob,new Path(args[1]));
            System.exit(SecondJob.waitForCompletion(true)?0:1);                 

        }
    }
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