DateExample_Year.java Source code

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Here is the source code for DateExample_Year.java

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//package org.apache.hadoop.examples;

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
//package org.apache.hadoop.examples;

import java.io.IOException;
import java.util.StringTokenizer;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.examples.MultiFileWordCount.WordOffset;
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.InputSplit;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.lib.input.CombineFileRecordReader;
import org.apache.hadoop.mapreduce.lib.input.CombineFileSplit;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.FileSplit;
import org.apache.hadoop.mapreduce.lib.input.RHadoopInputFormat;
import org.apache.hadoop.mapreduce.lib.input.LineRecordReader;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.GenericOptionsParser;

import org.apache.hadoop.mapreduce.lib.input.CombineFileInputFormat;

public class DateExample_Year {

    public static class TokenizerMapper extends Mapper<Object, Text, Text, IntWritable> {

        private final static IntWritable one = new IntWritable(1);
        private Text word = new Text();

        public void map(Object key, Text value, Context context) throws IOException, InterruptedException {
            long startTime = System.nanoTime();
            IsValidKeyFormat isv = new IsValidKeyFormat();

            String strValue = value.toString().trim();
            int keyIndex = strValue.indexOf("\t");
            if (keyIndex == -1)
                return;

            String dateKey = strValue.substring(0, keyIndex);

            if (isv.isValidKey(dateKey)) {
                // No reduce jobs
                // O(n) Job on value
                String logValue = strValue.substring(keyIndex);
                for (int i = 0; i < logValue.length(); i++)
                    ;
                //word.set(dateKey);
                //context.write(word, one);
            }
            runTimeMapper += System.nanoTime() - startTime;
        }
    }

    public static class IntSumReducer extends Reducer<Text, IntWritable, Text, IntWritable> {
        private IntWritable result = new IntWritable();

        public void reduce(Text key, Iterable<IntWritable> values, Context context)
                throws IOException, InterruptedException {
            int sum = 0;
            for (IntWritable val : values) {
                sum += val.get();
            }
            result.set(sum);
            context.write(key, result);
        }
    }

    public static class IsValidKeyFormat extends RHadoopInputFormat {
        class Date {
            int year;
            int month;
            int day;
            int hour;
            int minutes;
            String msg;

            Date(String str) {
                if (str == null)
                    return;
                String parts[] = str.split("/");
                if (parts.length != 3)
                    return;

                year = Integer.parseInt(parts[0]);
                month = Integer.parseInt(parts[1]);

                parts = parts[2].split("-");
                if (parts.length != 3)
                    return;

                day = Integer.parseInt(parts[0]);
                msg = parts[2];

                parts = parts[1].split(":");
                if (parts.length != 2)
                    return;

                hour = Integer.parseInt(parts[0]);
                minutes = Integer.parseInt(parts[0]);
            }
        }

        @Override
        public boolean isValidKeyRange(String lower, String upper) {
            Date lowKey = new Date(lower);
            Date highKey = new Date(upper);

            if (lowKey.year > 2500 || highKey.year < 2000)
                return false;
            return true;
        }
    }

    public static void main(String[] args) throws Exception {
        Configuration conf = new Configuration();
        String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
        if (otherArgs.length != 2) {
            System.err.println("Usage: wordcount <in> <out>");
            System.exit(2);
        }
        Job job = new Job(conf, "word count fs");
        job.setJarByClass(DateExample_Year.class);
        job.setMapperClass(TokenizerMapper.class);
        job.setCombinerClass(IntSumReducer.class);
        job.setReducerClass(IntSumReducer.class);
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(IntWritable.class);
        job.setInputFormatClass(IsValidKeyFormat.class);

        FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
        FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
        System.exit(job.waitForCompletion(true) ? 0 : 1);
    }
}